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/* Copyright (c) 1997 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Routines for veiling glare and loss of acuity. |
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*/ |
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syserror("malloc"); |
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for (y = 0; y < fvyr; y++) { |
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switch (inpres.or) { |
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switch (inpres.rt) { |
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case YMAJOR: case YMAJOR|XDECR: |
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v = (y+.5)/fvyr; break; |
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case YMAJOR|YDECR: case YMAJOR|YDECR|XDECR: |
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h = 1. - (y+.5)/fvyr; break; |
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} |
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for (x = 0; x < fvxr; x++) { |
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switch (inpres.or) { |
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switch (inpres.rt) { |
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case YMAJOR: case YMAJOR|YDECR: |
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h = (x+.5)/fvxr; break; |
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case YMAJOR|XDECR: case YMAJOR|XDECR|YDECR: |
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} |
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#if ADJ_VEIL |
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/* |
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* The following veil adjustment was added to compensate for |
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* the fact that contrast reduction gets confused with veil |
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* in the human visual system. Therefore, we reduce the |
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* veil in portions of the image where our mapping has |
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* already reduced contrast below the target value. |
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* This gets called after the intial veil has been computed |
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* and added to the foveal image, and the mapping has been |
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* determined. |
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*/ |
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adjveil() /* adjust veil image */ |
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{ |
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float *crfptr = crfimg; |
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COLOR *fovptr = fovimg; |
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COLOR *veilptr = veilimg; |
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double s2nits = 1./inpexp; |
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double vl, vl2, fovl, vlsum; |
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double deltavc[3]; |
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int i, j; |
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|
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if (lumf == rgblum) |
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s2nits *= WHTEFFICACY; |
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|
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for (i = fvxr*fvyr; i--; crfptr++, fovptr++, veilptr++) { |
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if (crfptr[0] >= 0.95) |
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continue; |
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vl = plum(veilptr[0]); |
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fovl = (plum(fovptr[0]) - vl) * (1./(1.-VADAPT)); |
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if (vl <= 0.05*fovl) |
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continue; |
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vlsum = vl; |
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for (j = 2; j < 11; j++) { |
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vlsum += crfptr[0]*vl - (1.0 - crfptr[0])*fovl; |
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vl2 = vlsum / (double)j; |
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if (vl2 < 0.0) |
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vl2 = 0.0; |
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crfptr[0] = crfactor(fovl + vl2); |
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} |
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/* desaturation code causes color fringes at this level */ |
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for (j = 3; j--; ) { |
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double vc = colval(veilptr[0],j); |
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double fovc = (colval(fovptr[0],j) - vc) * |
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(1./(1.-VADAPT)); |
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deltavc[j] = (1.-crfptr[0])*(fovl/s2nits - fovc); |
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if (vc + deltavc[j] < 0.0) |
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break; |
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} |
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if (j < 0) |
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addcolor(veilptr[0], deltavc); |
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else |
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scalecolor(veilptr[0], vl2/vl); |
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} |
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smoothveil(); /* smooth our result */ |
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} |
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|
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|
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smoothveil() /* smooth veil image */ |
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{ |
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COLOR *nveilimg; |
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COLOR *ovptr, *nvptr; |
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int x, y, i; |
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|
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nveilimg = (COLOR *)malloc(fvxr*fvyr*sizeof(COLOR)); |
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if (nveilimg == NULL) |
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return; |
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for (y = 1; y < fvyr-1; y++) { |
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ovptr = veilimg + y*fvxr + 1; |
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nvptr = nveilimg + y*fvxr + 1; |
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for (x = 1; x < fvxr-1; x++, ovptr++, nvptr++) |
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for (i = 3; i--; ) |
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nvptr[0][i] = 0.5 * ovptr[0][i] |
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+ (1./12.) * |
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(ovptr[-1][i] + ovptr[-fvxr][i] + |
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ovptr[1][i] + ovptr[fvxr][i]) |
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+ (1./24.) * |
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(ovptr[-fvxr-1][i] + ovptr[-fvxr+1][i] + |
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ovptr[fvxr-1][i] + ovptr[fvxr+1][i]); |
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} |
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ovptr = veilimg + 1; |
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nvptr = nveilimg + 1; |
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for (x = 1; x < fvxr-1; x++, ovptr++, nvptr++) |
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for (i = 3; i--; ) |
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nvptr[0][i] = 0.5 * ovptr[0][i] |
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+ (1./9.) * |
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(ovptr[-1][i] + ovptr[1][i] + ovptr[fvxr][i]) |
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+ (1./12.) * |
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(ovptr[fvxr-1][i] + ovptr[fvxr+1][i]); |
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ovptr = veilimg + (fvyr-1)*fvxr + 1; |
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nvptr = nveilimg + (fvyr-1)*fvxr + 1; |
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for (x = 1; x < fvxr-1; x++, ovptr++, nvptr++) |
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for (i = 3; i--; ) |
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nvptr[0][i] = 0.5 * ovptr[0][i] |
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+ (1./9.) * |
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(ovptr[-1][i] + ovptr[1][i] + ovptr[-fvxr][i]) |
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+ (1./12.) * |
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(ovptr[-fvxr-1][i] + ovptr[-fvxr+1][i]); |
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ovptr = veilimg + fvxr; |
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nvptr = nveilimg + fvxr; |
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for (y = 1; y < fvyr-1; y++, ovptr += fvxr, nvptr += fvxr) |
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for (i = 3; i--; ) |
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nvptr[0][i] = 0.5 * ovptr[0][i] |
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+ (1./9.) * |
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(ovptr[-fvxr][i] + ovptr[1][i] + ovptr[fvxr][i]) |
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+ (1./12.) * |
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(ovptr[-fvxr+1][i] + ovptr[fvxr+1][i]); |
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ovptr = veilimg + fvxr - 1; |
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nvptr = nveilimg + fvxr - 1; |
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for (y = 1; y < fvyr-1; y++, ovptr += fvxr, nvptr += fvxr) |
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for (i = 3; i--; ) |
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nvptr[0][i] = 0.5 * ovptr[0][i] |
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+ (1./9.) * |
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(ovptr[-fvxr][i] + ovptr[-1][i] + ovptr[fvxr][i]) |
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+ (1./12.) * |
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(ovptr[-fvxr-1][i] + ovptr[fvxr-1][i]); |
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for (i = 3; i--; ) { |
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nveilimg[0][i] = veilimg[0][i]; |
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nveilimg[fvxr-1][i] = veilimg[fvxr-1][i]; |
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nveilimg[(fvyr-1)*fvxr][i] = veilimg[(fvyr-1)*fvxr][i]; |
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nveilimg[fvyr*fvxr-1][i] = veilimg[fvyr*fvxr-1][i]; |
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} |
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free((void *)veilimg); |
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veilimg = nveilimg; |
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} |
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#endif |
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|
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addveil(sl, y) /* add veil to scanline */ |
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COLOR *sl; |
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int y; |
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if (sb == NULL) |
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syserror("malloc"); |
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do { |
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sb->sampe = se; |
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sb->len = sl>>se; |
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if (sb->len <= 0) |
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continue; |
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sb->sampe = se; |
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sb->nscans = ns; |
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sb->sdata = (COLOR *)malloc(sb->len*ns*sizeof(COLOR)); |
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if (sb->sdata == NULL) |