2 * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
3 * Copyright (c) 2002-2007, Professor Benoit Macq
4 * Copyright (c) 2001-2003, David Janssens
5 * Copyright (c) 2002-2003, Yannick Verschueren
6 * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
7 * Copyright (c) 2005, Herve Drolon, FreeImage Team
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32 #include "opj_includes.h"
35 /* This table contains the norms of the basis function of the reversible MCT. */
37 static const double mct_norms[3] = { 1.732, .8292, .8292 };
40 /* This table contains the norms of the basis function of the irreversible MCT. */
42 static const double mct_norms_real[3] = { 1.732, 1.805, 1.573 };
45 /* Foward reversible MCT. */
54 for(i = 0; i < n; ++i) {
58 int y = (r + (g * 2) + b) >> 2;
68 /* Inverse reversible MCT. */
77 for (i = 0; i < n; ++i) {
81 int g = y - ((u + v) >> 2);
91 /* Get norm of basis function of reversible MCT. */
93 double mct_getnorm(int compno) {
94 return mct_norms[compno];
98 /* Foward irreversible MCT. */
100 void mct_encode_real(
107 for(i = 0; i < n; ++i) {
111 int y = fix_mul(r, 2449) + fix_mul(g, 4809) + fix_mul(b, 934);
112 int u = -fix_mul(r, 1382) - fix_mul(g, 2714) + fix_mul(b, 4096);
113 int v = fix_mul(r, 4096) - fix_mul(g, 3430) - fix_mul(b, 666);
121 /* Inverse irreversible MCT. */
123 void mct_decode_real(
130 for(i = 0; i < n; ++i) {
134 float r = y + (v * 1.402f);
135 float g = y - (u * 0.34413f) - (v * (0.71414f));
136 float b = y + (u * 1.772f);
144 /* Get norm of basis function of irreversible MCT. */
146 double mct_getnorm_real(int compno) {
147 return mct_norms_real[compno];