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213 lines
7.9 KiB
C
213 lines
7.9 KiB
C
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/*
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#
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# File : bayer.h
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# ( C++ header file - CImg plug-in )
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#
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# Description : CImg plugin that implements the conversion of a color image to a
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# Bayer-coded matrix, and its reverse transform.
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#
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# Copyright : David Tschumperlé
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# ( https://tschumperle.users.greyc.fr/ )
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#
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# This software is governed by the CeCILL license under French law and
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# abiding by the rules of distribution of free software. You can use,
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# modify and/or redistribute the software under the terms of the CeCILL
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# license as circulated by CEA, CNRS and INRIA at the following URL
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# "http://www.cecill.info".
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#
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# As a counterpart to the access to the source code and rights to copy,
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# modify and redistribute granted by the license, users are provided only
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# with a limited warranty and the software's author, the holder of the
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# economic rights, and the successive licensors have only limited
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# liability.
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#
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# In this respect, the user's attention is drawn to the risks associated
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# with loading, using, modifying and/or developing or reproducing the
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# software by the user in light of its specific status of free software,
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# that may mean that it is complicated to manipulate, and that also
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# therefore means that it is reserved for developers and experienced
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# professionals having in-depth computer knowledge. Users are therefore
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# encouraged to load and test the software's suitability as regards their
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# requirements in conditions enabling the security of their systems and/or
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# data to be ensured and, more generally, to use and operate it in the
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# same conditions as regards security.
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#
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# The fact that you are presently reading this means that you have had
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# knowledge of the CeCILL license and that you accept its terms.
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#
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*/
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#ifndef cimg_plugin_bayer
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#define cimg_plugin_bayer
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//! Convert RGB color image to a Bayer-coded scalar image.
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/**
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\note First (upper-left) pixel if the red component of the pixel color.
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**/
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CImg<T>& RGBtoBayer() {
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return get_RGBtoBayer().move_to(*this);
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}
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//! Convert RGB color image to a Bayer-coded scalar image \newinstance.
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CImg<T> get_RGBtoBayer() const {
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if (_spectrum!=3)
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throw CImgInstanceException(_cimg_instance
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"RGBtoBayer(): Instance is not a RGB image.",
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cimg_instance);
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CImg<T> res(_width,_height,_depth,1);
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const T *ptr_r = data(0,0,0,0), *ptr_g = data(0,0,0,1), *ptr_b = data(0,0,0,2);
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T *ptrd = res._data;
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cimg_forXYZ(*this,x,y,z) {
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if (y%2) {
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if (x%2) *(ptrd++) = *ptr_b;
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else *(ptrd++) = *ptr_g;
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} else {
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if (x%2) *(ptrd++) = *ptr_g;
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else *(ptrd++) = *ptr_r;
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}
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++ptr_r; ++ptr_g; ++ptr_b;
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}
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return res;
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}
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//! Convert Bayer-coded scalar image to a RGB color image.
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CImg<T>& BayertoRGB(const unsigned int interpolation_type=3) {
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return get_BayertoRGB(interpolation_type).move_to(*this);
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}
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//! Convert Bayer-coded scalar image to a RGB color image \newinstance.
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CImg<Tuchar> get_BayertoRGB(const unsigned int interpolation_type=3) const {
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if (_spectrum!=1)
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throw CImgInstanceException(_cimg_instance
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"BayertoRGB(): Instance is not a Bayer image.",
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cimg_instance);
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CImg<Tuchar> res(_width,_height,_depth,3);
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CImg_3x3(I,T);
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Tuchar *ptr_r = res.data(0,0,0,0), *ptr_g = res.data(0,0,0,1), *ptr_b = res.data(0,0,0,2);
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switch (interpolation_type) {
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case 3 : { // Edge-directed
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CImg_3x3(R,T);
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CImg_3x3(G,T);
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CImg_3x3(B,T);
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cimg_forXYZ(*this,x,y,z) {
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const int _p1x = x?x - 1:1, _p1y = y?y - 1:1, _n1x = x<width() - 1?x + 1:x - 1, _n1y = y<height() - 1?y + 1:y - 1;
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cimg_get3x3(*this,x,y,z,0,I,T);
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if (y%2) {
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if (x%2) {
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const Tfloat
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alpha = cimg::sqr((Tfloat)Inc - Ipc),
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beta = cimg::sqr((Tfloat)Icn - Icp),
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cx = 1/(1 + alpha), cy = 1/(1 + beta);
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*ptr_g = (Tuchar)((cx*(Inc + Ipc) + cy*(Icn + Icp))/(2*(cx + cy)));
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} else *ptr_g = (Tuchar)Icc;
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} else {
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if (x%2) *ptr_g = (Tuchar)Icc;
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else {
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const Tfloat
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alpha = cimg::sqr((Tfloat)Inc - Ipc),
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beta = cimg::sqr((Tfloat)Icn - Icp),
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cx = 1/(1 + alpha), cy = 1/(1 + beta);
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*ptr_g = (Tuchar)((cx*(Inc + Ipc) + cy*(Icn + Icp))/(2*(cx + cy)));
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}
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}
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++ptr_g;
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}
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cimg_forXYZ(*this,x,y,z) {
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const int _p1x = x?x - 1:1, _p1y = y?y - 1:1, _n1x = x<width() - 1?x + 1:x - 1, _n1y = y<height() - 1?y + 1:y - 1;
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cimg_get3x3(*this,x,y,z,0,I,T);
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cimg_get3x3(res,x,y,z,1,G,T);
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if (y%2) {
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if (x%2) *ptr_b = (Tuchar)Icc;
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else { *ptr_r = (Tuchar)((Icn + Icp)/2); *ptr_b = (Tuchar)((Inc + Ipc)/2); }
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} else {
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if (x%2) { *ptr_r = (Tuchar)((Inc + Ipc)/2); *ptr_b = (Tuchar)((Icn + Icp)/2); }
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else *ptr_r = (Tuchar)Icc;
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}
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++ptr_r; ++ptr_b;
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}
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ptr_r = res.data(0,0,0,0);
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ptr_g = res.data(0,0,0,1);
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ptr_b = res.data(0,0,0,2);
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cimg_forXYZ(*this,x,y,z) {
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const int _p1x = x?x - 1:1, _p1y = y?y - 1:1, _n1x = x<width() - 1?x + 1:x - 1, _n1y = y<height() - 1?y + 1:y - 1;
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cimg_get3x3(res,x,y,z,0,R,T);
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cimg_get3x3(res,x,y,z,1,G,T);
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cimg_get3x3(res,x,y,z,2,B,T);
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if (y%2) {
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if (x%2) {
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const float
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alpha = (float)cimg::sqr(Rnc - Rpc),
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beta = (float)cimg::sqr(Rcn - Rcp),
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cx = 1/(1 + alpha), cy = 1/(1 + beta);
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*ptr_r = (Tuchar)((cx*(Rnc + Rpc) + cy*(Rcn + Rcp))/(2*(cx + cy)));
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}
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} else {
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if (!(x%2)) {
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const float
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alpha = (float)cimg::sqr(Bnc - Bpc),
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beta = (float)cimg::sqr(Bcn - Bcp),
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cx = 1/(1 + alpha), cy = 1/(1 + beta);
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*ptr_b = (Tuchar)((cx*(Bnc + Bpc) + cy*(Bcn + Bcp))/(2*(cx + cy)));
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}
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}
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++ptr_r; ++ptr_g; ++ptr_b;
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}
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} break;
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case 2 : { // Linear interpolation
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cimg_forXYZ(*this,x,y,z) {
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const int _p1x = x?x - 1:1, _p1y = y?y - 1:1, _n1x = x<width() - 1?x + 1:x - 1, _n1y = y<height() - 1?y + 1:y - 1;
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cimg_get3x3(*this,x,y,z,0,I,T);
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if (y%2) {
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if (x%2) {
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*ptr_r = (Tuchar)((Ipp + Inn + Ipn + Inp)/4);
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*ptr_g = (Tuchar)((Inc + Ipc + Icn + Icp)/4);
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*ptr_b = (Tuchar)Icc;
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} else { *ptr_r = (Tuchar)((Icp + Icn)/2); *ptr_g = (Tuchar)Icc; *ptr_b = (Tuchar)((Inc + Ipc)/2); }
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} else {
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if (x%2) { *ptr_r = (Tuchar)((Ipc + Inc)/2); *ptr_g = (Tuchar)Icc; *ptr_b = (Tuchar)((Icn + Icp)/2); }
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else {
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*ptr_r = (Tuchar)Icc;
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*ptr_g = (Tuchar)((Inc + Ipc + Icn + Icp)/4);
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*ptr_b = (Tuchar)((Ipp + Inn + Ipn + Inp)/4);
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}
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}
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++ptr_r; ++ptr_g; ++ptr_b;
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}
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} break;
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case 1 : { // Nearest neighbor interpolation
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cimg_forXYZ(*this,x,y,z) {
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const int _p1x = x?x - 1:1, _p1y = y?y - 1:1, _n1x = x<width() - 1?x + 1:x - 1, _n1y = y<height() - 1?y + 1:y - 1;
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cimg_get3x3(*this,x,y,z,0,I,T);
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if (y%2) {
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if (x%2) {
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*ptr_r = (Tuchar)cimg::min(Ipp,Inn,Ipn,Inp);
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*ptr_g = (Tuchar)cimg::min(Inc,Ipc,Icn,Icp);
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*ptr_b = (Tuchar)Icc;
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} else { *ptr_r = (Tuchar)cimg::min(Icn,Icp); *ptr_g = (Tuchar)Icc; *ptr_b = (Tuchar)cimg::min(Inc,Ipc); }
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} else {
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if (x%2) { *ptr_r = (Tuchar)cimg::min(Inc,Ipc); *ptr_g = (Tuchar)Icc; *ptr_b = (Tuchar)cimg::min(Icn,Icp); }
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else {
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*ptr_r = (Tuchar)Icc;
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*ptr_g = (Tuchar)cimg::min(Inc,Ipc,Icn,Icp);
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*ptr_b = (Tuchar)cimg::min(Ipp,Inn,Ipn,Inp);
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}
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}
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++ptr_r; ++ptr_g; ++ptr_b;
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}
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} break;
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default : { // 0-filling interpolation
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const T *ptrs = _data;
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res.fill(0);
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cimg_forXYZ(*this,x,y,z) {
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const T val = *(ptrs++);
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if (y%2) { if (x%2) *ptr_b = val; else *ptr_g = val; } else { if (x%2) *ptr_g = val; else *ptr_r = val; }
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++ptr_r; ++ptr_g; ++ptr_b;
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}
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}
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}
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return res;
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}
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#endif /* cimg_plugin_bayer */
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