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.\" RCSid $Id$ |
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.TH EVALGLARE 1 7/30/15 RADIANCE |
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.SH NAME |
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.PP |
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evalglare \- determines and evaluates glare sources within a 180 degree |
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fish\-eye\-image, given in the RADIANCE RGBE (.hdr) image format. |
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evalglare \- determines and evaluates glare sources within a 180 degree fisheye HDR image |
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.SH SYNOPSIS |
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.PP |
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evalglare [\-s] [\-y] [\-Y value] [\-B angle] [\-b factor] [\-c checkfile] |
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[\-t xpos ypos angle] [\-T xpos ypos angle] [\-d] [\-r angle] [\[en]i |
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Ev] [\[en]I Ev yfill_max y_fill_min ] [\-v] [\-V] [\[en]g type] [\-G |
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type] [\-u r g b ] [\-vf viewfile] [\-vtt ] [\-vv vertangle] [\-vh horzangle] hdrfile |
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.PP |
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or |
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.PP |
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hdr|evalglare [\-s] [\-y] [\-Y value] [\-B angle] [\-b factor] [\-c |
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checkfile] [\-t xpos ypos angle][\-T xpos ypos angle] [\-d] [\-r angle] |
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[\[en]i Ev] [\[en]I Ev yfill_max y_fill_min ] [\-v] [\-V] ] [\[en]g |
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type] [\-G type] [\-u r g b ] [\-vf viewfile][\-vtt ] [\-vv vertangle] [\-vh |
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horzangle] |
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.nh |
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.B evalglare |
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[ |
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.BI \-s |
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] |
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[ |
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.BI \-y |
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] |
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[ |
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.BI \-Y \ value |
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[ |
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.BI \-B " angle" |
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.BI \-b " factor" |
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.BI \-c " checkfile" |
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.BI \-t " xpos ypos angle" |
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] |
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[ |
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.BI \-T " xpos ypos angle" |
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] |
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[ \-d ] |
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[ |
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.BI \-r " angle" |
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] |
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.BI \-i " Ev" |
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] |
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[ |
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.BI \-I " Ev yfill_max y_fill_min" |
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] |
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[ |
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.BI \-v |
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] |
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[ |
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.BI \-V |
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] |
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[ |
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.BI \-g " type" |
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] |
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[ |
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.BI \-G " type" |
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] |
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[ |
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.BI \-u " r g b" |
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] |
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[ |
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.BI \-vf " viewfile" |
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] |
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[ |
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.BI \-vt t |
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] |
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[ |
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.BI \-vv " vertangle" |
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] |
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[ |
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.BI \-vh " horzangle" |
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] |
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.RI [ hdrfile ] |
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.hy |
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.SH DESCRIPTION |
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.PP |
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evalglare determines and evaluates glare sources within a 180 degree |
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fish\-eye\-image, given in the RADIANCE image format (.pic or .hdr). |
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The image should be rendered as fish eye (e.g. |
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using the \-vta or \[en]vth option) using 180 degree for the horizontal and |
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vertical view angle (\-vv =180, \-vh=180). |
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Due to performance reasons of the evalglare code, the image should be |
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smaller than 1200x1200 pixels. The recommended size is 800x800 pixels. |
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In the first step, the program uses a given threshold to determine all |
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glare sources. |
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Three different threshold methods are implemented. |
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The recommended method is to define a task area by \-t or \-T option. |
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In this (task) area the average luminance is calculated Each pixel, |
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exceeding this value multiplied by the \-b factor [default=5] is treated |
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as a potential glare source. |
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The other two methods are described below [see \-b]. |
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In the second step the program tries to merge glare source pixels to one |
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glare source, when they are placed nearby each other. |
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This merging is performed in\-between a search area, given by an opening |
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angle (\-r, default =0.2 in radiant). |
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If a check file is written (\-c fname), the detected glare sources will |
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be colored to different colors where the rest of the image is set to |
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gray. |
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The luminance values of all pixels are kept to the initial value. |
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The color is chosen by chance, no significance is given by the color. |
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To enable a unform coloring for all glare sources, the \-u option can be used. |
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Luminance peaks can be extracted to separate glare sources by using the |
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\-y or \-Y value option (default since version v0.9c). |
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Default value (\-y) is 50000 cd/m2, can be changed by using \-Y value. |
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A smoothing option (\-s) counts initial non\-glare source pixels to |
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glare sources, when they are surrounded by a glare source. |
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.B Evalglare |
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determines and evaluates glare sources within a 180 degree fisheye |
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image, given in the RADIANCE image format (.pic or .hdr). If |
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.I hdrfile |
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is not given as an argument, the standard input is read. The image |
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should be rendered as fisheye (e.g. using the |
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.BI \-vt a |
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or |
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.BI \-vt h |
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option) using 180 degrees for the horizontal and vertical view angle |
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.RB ( -vv |
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.IR 180 , |
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.B -vh |
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.IR 180 ). |
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The recommended size of images input to |
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.B evalglare |
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is 1000x1000 pixels; the computations become very long when the image |
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is more than 1200x1200 pixels. |
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.PP |
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The program calculates the daylight glare probability (DGP) as well as |
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other glare indexes (dgi,ugr,vcp,cgi) to the standard output. |
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The DGP describes the fraction of persons disturbed, caused by glare from |
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daylight (range 0...1). |
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Values lower than 0.2 are out of the range of the user assessment tests, |
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where the program is based on and should be interpreted carefully. |
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A low light correction is applied to the DGP when the vertical illumiance is lower than 500 lux. |
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By the use of \-g or \-G the field of view is cut according the the definition of Guth. |
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The option \-B angle (in rad) calculates the average luminance of a horizontal band. |
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In the case of non\-180 degree images, an external measured illuminance value |
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can be provided by using the \[en]i or \[en]I option. |
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The use of the \[en]I option enables the filling up of images, which are |
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horizontally cut. |
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The age correction is not supported any more and disabled. |
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If the option \-d is used, all found glare sources and their position, |
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size, and luminance values are printed to the standard output, too. |
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The last line gives following values: 1. |
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dgp, 2. |
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average luminance of image,3. |
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vertical eye illuminance, 4. |
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background luminance, 5. |
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direct vertical eye illuminance, 6. |
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dgi, 7. |
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ugr, 8. |
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vcp, 9. |
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cgi, 10. |
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average luminance of all glare sources, 11. |
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sum of solid angles of all glare sources 12. |
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Veiling luminance (disability glare) 13. |
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x\-direction of glare source 14. |
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y\-direction of glare source 15. |
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z\-direction of glare source 16. |
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band luminance |
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The calculation of glare proceeds in two steps: |
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.IP 1. 3em |
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In the first step, the program uses a given threshold |
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to determine all glare sources. Three different threshold methods are |
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implemented. The recommended method is to define a task area by |
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.B \-t |
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or |
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.B \-T |
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option. The average luminance of the task area is calculated. Each |
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pixel exceeding this value multiplied by the |
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.B \-b |
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factor, default 5, is treated as a potential glare source. The other |
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two methods are described below, see |
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.BR \-b . |
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.IP 2. |
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In the second step, the program tries to merge glare source pixels to |
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one glare source, when they are placed nearby each other. This |
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merging is performed between search areas, given by an opening angle |
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.BR \-r , |
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default 0.2 radians. If a check file is written, |
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.B \-c |
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.IR fname , |
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the detected glare sources will be colored, each with a different |
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color, and the rest of the image will be set to gray. The luminance values |
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of all pixels are kept to the initial value. The color is chosen by |
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chance, no significance is given by the color. To enable unform |
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coloring of all glare sources, the |
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.B \-u |
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option can be used. Luminance |
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peaks can be extracted to separate glare sources by using the |
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.B \-y |
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or |
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.BI \-Y " value" |
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option. The default value |
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.B \-y |
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is 50,000 cd/m2, which can be changed by using the |
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.B \-Y |
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value. A smoothing option, |
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.BR \-s , |
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counts initial non-glare source pixels to glare sources, when they are |
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surrounded by a glare source. |
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.PP |
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The program is based on the studies from J. |
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Christoffersen and J. |
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Wienold (see \“Evaluation methods and development of a new glare |
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prediction model for daylight environments with the use of CCD cameras |
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and RADIANCE\“ , Energy and Buildings, 2006. |
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More details can be also found in following issertation: J. |
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Wienold, \“Daylight glare in offices\”, Fraunhofer IRB, 2010. |
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URL for download: |
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http://publica.fraunhofer.de/eprints/urn:nbn:de:0011\-n\-1414579.pdf |
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The program calculates the daylight glare probability (DGP) as well as |
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other glare indices (DGI, UGR, VCP, CGI) and writes them to the |
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standard output. The DGP describes the fraction of persons disturbed |
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caused by glare from daylight as a number from 0 to 1, where 0 is |
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no-one disturbed and 1 is everyone. Values lower than 0.2 are out of |
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the range of the user assessment tests which the program is based on |
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and should be interpreted carefully. A low light correction is |
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applied to the DGP when the vertical illumiance is lower than 500 lux. |
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By the use of |
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.B \-g |
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or |
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.B \-G |
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.\" Citation? |
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the field of view is cut according the the definition of Guth. |
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The option |
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.B \-B |
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angle (in radians) calculates the average luminance of a |
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horizontal band. In the case of non-180 degree images, an external |
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measured illuminance value can be provided by using the |
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.B \-i |
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or |
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.B \-I |
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option. The use of the |
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.B \-I |
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option enables the filling up of images, which are horizontally cut. |
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If the |
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option |
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.B \-d |
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is used, all found glare sources and their position, size, and |
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luminance values are printed to the standard output, too. The last |
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line gives following values: (1) DGP, (2) average luminance of image, |
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(3) vertical eye illuminance, (4) background luminance, (5) direct |
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vertical eye illuminance, (6) DGI, (7) UGR, (8) VCP, (9) CGI, (10) |
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average luminance of all glare sources, (11) sum of solid angles of |
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all glare sources, (12) Veiling luminance (disability glare), (13) |
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x-direction of glare source, (14) y-direction of glare source, (15) |
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z-direction of glare source, and (16) band luminance. |
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.SH OPTIONS |
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.TP |
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.B \-B \f[I]angle\f[], |
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Calculate average luminance of a horizontal band. The angle is in rad. Output only when using the \-d option. |
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.RS |
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.RE |
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.BI \-B \ angle |
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Calculate average luminance of a horizontal band. The angle is in |
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radians. This calculation does not affect glare source detection. |
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Output only when using the |
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.B \-d |
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option. |
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.TP |
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.B \-b \f[I]factor\f[], |
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Threshold factor; if factor >100, it is used as constant threshold in |
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cd/m2, regardless if a task position is given or not if factor is <= 100 |
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and a task position is given, this factor multiplied by the average task |
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luminance will be used as threshold for detecting the glare sources if |
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factor is <= 100 and no task position is given, this factor multiplied |
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by the average luminance in the entire picture will be used as threshold |
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for detecting the glare sources, default value=5. |
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.RS |
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.RE |
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.BI \-b \ factor |
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Threshold factor; if factor is over 100, it is used as constant threshold in |
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cd/m2, regardless if a task position is given or not if |
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factor is less than or equal to 100 and a task position is given, this |
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factor multiplied by the average task luminance will be used as |
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threshold for detecting the glare sources if factor is less than or |
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equal to 100 and no task position is given, this factor multiplied by |
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the average luminance in the entire picture will be used as threshold |
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for detecting the glare sources, default\ 5. |
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.TP |
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.B \-c \f[I]fname\f[] |
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.BI \-c \ fname |
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writes a checkfile in the RADIANCE picture format |
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.RS |
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– |
.RE |
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.TP |
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.B \-d |
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enables detailed output (default: disabled) |
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.RS |
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– |
.RE |
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.TP |
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.B \-g \f[I]type\f[] |
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cut field of view according to Guth, write checkfile specified by \[en]c |
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and exit without any glare evaluation. |
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type=1: total field of view type=2: field of view seen by both eyes |
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.RS |
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.RE |
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.BI \-g \ type |
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cut field of view according to Guth, write checkfile specified by |
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.B \-c |
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and exit without any glare evaluation. Type 1: total field of view. |
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Type 2: field of view seen by both eyes |
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.TP |
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.B \-G \f[I]type\f[] |
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cut field of view according to Guth, perform glare evaluation. |
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type=1: total field of view type=2: field of view seen by both eyes |
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.RS |
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.RE |
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.BI \-G \ type |
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Cut the field of view according to Guth, perform glare evaluation. |
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Type 1: total field of view. Type 2: field of view seen by both eyes |
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.TP |
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.B \-i \f[I]Ev\f[] |
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The vertical illuminance is measured externally. |
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This value will be used for calculating the dgp. |
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.RS |
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.RE |
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.BI \-i \ Ev |
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The vertical illuminance is measured externally. This value will be |
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used for calculating the dgp. |
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.TP |
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.B \-I \f[I]Ev y_max y_min\f[] |
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.BI \-I \ Ev \ y_max \ y_min |
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The vertical illuminance is measured externally. |
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This value will be used for calculating the dgp. |
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Below y_min and above y_max, the picture is filled up by the last known |
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value. |
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This option should be used, when the provided picture is cut |
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horizontally. |
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.RS |
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.RE |
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This value will be used for calculating the DGP. |
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Below |
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.I y_min |
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and above |
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.IR y_max , |
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the picture is filled up by the last known value. This option should |
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be used, when the provided picture is cut horizontally. |
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.TP |
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.B \-r \f[I]angle\f[] |
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search radius (angle in radiant) between pixels, where evalglare tries |
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.BI \-r \ angle |
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search radius (angle in radians) between pixels, where |
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.B evalglare |
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tries |
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to merge glare source pixels to the same glare source (default value: |
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0.2 radiant) |
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.RS |
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.RE |
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0.2 radians) |
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.TP |
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.B \-s |
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enables smoothing function (default: disabled) |
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.RS |
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– |
.RE |
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.TP |
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.B \-t \f[I]xpos ypos angle\f[] |
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.BI \-t \ xpos \ ypos \ angle |
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definition of task position in x and y coordinates, and its opening |
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angle in radiant |
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.RS |
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.RE |
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angle in radians |
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.TP |
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.B \-T \f[I]xpos ypos angle\f[] |
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same as \-t, except that the task area is colored bluish in the |
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checkfile |
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.RS |
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.RE |
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.BI \-T \ xpos \ ypos \ angle |
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same as |
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.BR \-t , |
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except that the task area is colored bluish in the checkfile |
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.TP |
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.B \-u \f[I]r g b\f[] |
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color glare sources unfiformly when writing check file (implies \-c option). Color given in r g b. |
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.RS |
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.RE |
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.BI \-u \ r \ g \ b |
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color glare sources uniformly when writing check file (implies |
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.B \-c |
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option). Color given in r g b. |
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.TP |
| 245 |
|
.B \-v |
| 246 |
< |
show version of evalglare and exit |
| 247 |
< |
.RS |
| 248 |
< |
.RE |
| 246 |
> |
show version of |
| 247 |
> |
.B evalglare |
| 248 |
> |
and exit |
| 249 |
|
.TP |
| 250 |
|
.B \-V |
| 251 |
|
Just calculate the vertical illuminance and exit |
| 189 |
– |
.RS |
| 190 |
– |
.RE |
| 252 |
|
.TP |
| 253 |
|
.B \-x |
| 254 |
|
disable peak extraction |
| 194 |
– |
.RS |
| 195 |
– |
.RE |
| 255 |
|
.TP |
| 256 |
|
.B \-y |
| 257 |
|
enables peak extraction (default: enabled) |
| 199 |
– |
.RS |
| 200 |
– |
.RE |
| 258 |
|
.TP |
| 259 |
< |
.B \-Y \f[I]value\f[] |
| 260 |
< |
enables peak extraction with value as threshold for extracted peaks |
| 261 |
< |
.RS |
| 262 |
< |
.RE |
| 259 |
> |
.BI \-Y \ value |
| 260 |
> |
enables peak extraction with |
| 261 |
> |
.I value |
| 262 |
> |
as threshold for extracted peaks. |
| 263 |
|
.PP |
| 264 |
< |
In case, the view settings within the image are missing or are not valid |
| 265 |
< |
(e.g. |
| 266 |
< |
after the use of pcompos or pcomb), the view options can be set by |
| 267 |
< |
command line options. |
| 268 |
< |
As soon as view options are set within the command line, view options |
| 269 |
< |
within the image are ignored. |
| 270 |
< |
The view options are implemented according to the RADIANCE definition |
| 271 |
< |
(please read man page of rpict for details): |
| 264 |
> |
.I "If the view settings in the image file" |
| 265 |
> |
are missing or are not valid (e.g. after the use of |
| 266 |
> |
.BR pcompos "(1) or " pcomb (1)), |
| 267 |
> |
the view options can be set by command line options. If view options |
| 268 |
> |
are set on the command line, view options in the image file header are |
| 269 |
> |
ignored. The view options are implemented according to the RADIANCE |
| 270 |
> |
definition; please read the |
| 271 |
> |
.BR rpict (1) |
| 272 |
> |
man page for details. |
| 273 |
> |
.sp |
| 274 |
|
.TP |
| 275 |
< |
.B \-vtt |
| 276 |
< |
Set view type to t (for fish\-eye views, please use \[en]vta or \[en]vth |
| 275 |
> |
.BI \-vt t |
| 276 |
> |
Set view type to t (for fisheye views, please use |
| 277 |
> |
.BI \-vt \ a |
| 278 |
> |
or |
| 279 |
> |
.BI \-vt \ h |
| 280 |
|
preferably) |
| 219 |
– |
.RS |
| 220 |
– |
.RE |
| 281 |
|
.TP |
| 282 |
< |
.B \-vf \f[I]viewfile\f[] |
| 282 |
> |
.BI \-vf \ viewfile |
| 283 |
|
Get view parameters from file |
| 224 |
– |
.RS |
| 225 |
– |
.RE |
| 284 |
|
.TP |
| 285 |
< |
.B \-vv \f[I]val\f[] |
| 285 |
> |
.BI \-vv \ val |
| 286 |
|
Set the view vertical size to val |
| 229 |
– |
.RS |
| 230 |
– |
.RE |
| 287 |
|
.TP |
| 288 |
< |
.B \-vh \f[I]val\f[] |
| 289 |
< |
Set the view horizontal size to \f[I]val\f[] |
| 290 |
< |
.RS |
| 291 |
< |
.RE |
| 288 |
> |
.BI \-vh \ val |
| 289 |
> |
Set the view horizontal size to |
| 290 |
> |
.I val |
| 291 |
> |
.SH AUTHOR |
| 292 |
> |
Jan Wienold. |
| 293 |
> |
.SH SEE ALSO |
| 294 |
> |
.BR rpict (1) |
| 295 |
> |
.SH REFERENCES |
| 296 |
> |
.B Evalglare |
| 297 |
> |
is based on the studies by J. Christoffersen and J. |
| 298 |
> |
Wienold (see \*(lqEvaluation methods and development of a new glare |
| 299 |
> |
prediction model for daylight environments with the use of CCD cameras |
| 300 |
> |
and RADIANCE,\*(rq |
| 301 |
> |
.IR "Energy and Buildings 38" , |
| 302 |
> |
2006, pp. 743\-757, doi:10.1016/j.enbuild.2006.03.017. More |
| 303 |
> |
details can be also found in following dissertation: J. Wienold, |
| 304 |
> |
.IR "Daylight glare in offices" , |
| 305 |
> |
Fraunhofer IRB, 2010, available online at |
| 306 |
> |
.nh |
| 307 |
> |
<http://publica.fraunhofer.de/dokumente/N-141457.html>. |
| 308 |
> |
.hy |
| 309 |
|
.SH ACKNOWLEDGEMENTS |
| 310 |
+ |
The evalglare program was originally developed by Jan Wienold at the |
| 311 |
+ |
Fraunhofer Institute for Solar Energy Systems in Freiburg, Germany. It |
| 312 |
+ |
is being further developed and maintained by the same author at EPFL, |
| 313 |
+ |
Lausanne, Switzerland. |
| 314 |
|
.PP |
| 315 |
< |
The evalglare program was developped by Jan Wienold originally at the Fraunhofer |
| 316 |
< |
Institute for Solar Energy Systems in Freiburg, Germany. It is further developped |
| 317 |
< |
and maintained by the same author at EPFL, Lausanne, Switzerland. |
| 315 |
> |
The author would like to thank C. Reetz for his generous help and his |
| 316 |
> |
support of providing libraries for the program. The EU Commission |
| 317 |
> |
supported this work as part of the EU project \*(lqEnergy and Comfort |
| 318 |
> |
Control for Building management systems\*(rq (ECCO-Build, Contract |
| 319 |
> |
ENK6-CT-2002-00656). |
| 320 |
|
.PP |
| 321 |
< |
The author would like to thank C. |
| 322 |
< |
Reetz for his generous help and his support of providing libraries for |
| 244 |
< |
the program. |
| 245 |
< |
The EU Commission supported this work as part of the EU project “Energy |
| 246 |
< |
and Comfort Control for Building management systems” (ECCO\-Build, |
| 247 |
< |
Contract N°: ENK6\-CT\-2002\-00656). |
| 248 |
< |
.PP |
| 249 |
< |
The dfg\-foundation (contract WI 1304/7\-2 ) supported the research for |
| 250 |
< |
the extension of evalglare for low\-light scenes. |
| 251 |
< |
.SH AUTHORS |
| 252 |
< |
Jan Wienold. |
| 321 |
> |
German Research Foundation (DFG) contract WI 1304/7-2 supported the research |
| 322 |
> |
for the extension of evalglare for low light scenes. |
