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https://opencores.org/ocsvn/mb-jpeg/mb-jpeg/trunk
Subversion Repositories mb-jpeg
[/] [mb-jpeg/] [tags/] [STEP2_2b/] [bmp2jpg_mb/] [ColorConversion.c] - Rev 68
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#include <stdio.h> #include "io.h" #if 0 /*USED VALUES OF ROY's CODE THIS MIGHT LEAD TO PROBLEMS*/ signed char RGB2Y (int r, int g, int b) { return ((66*r + 129*g + 25*b + 128)>>8)+128; } /*USED VALUES OF ROY's CODE THIS MIGHT LEAD TO PROBLEMS*/ signed char RGB2Cr (int r, int g, int b) { return ((-38*r - 74*g + 112*b + 128)>>8)+128; } /*USED VALUES OF ROY's CODE THIS MIGHT LEAD TO PROBLEMS*/ signed char RGB2Cb (int r, int g, int b) { return ((112*r - 94*g - 18*b + 128)>>8)+128; } void RGB2YCrCb(signed char pixelmatrix[MATRIX_SIZE][MATRIX_SIZE*3],signed char YMatrix[MATRIX_SIZE][MATRIX_SIZE],signed char CrMatrix[MATRIX_SIZE][MATRIX_SIZE],signed char CbMatrix[MATRIX_SIZE][MATRIX_SIZE]) { unsigned int row, col; for(row = 0;row < MATRIX_SIZE; row++) { for(col = 0; col < MATRIX_SIZE; col++) { YMatrix[row][col] = RGB2Y(pixelmatrix[row][col*3+2],pixelmatrix[row][col*3+1],pixelmatrix[row][col*3]) - 128; CrMatrix[row][col] = RGB2Cr(pixelmatrix[row][col*3+2],pixelmatrix[row][col*3+1],pixelmatrix[row][col*3]) - 128; CbMatrix[row][col] = RGB2Cb(pixelmatrix[row][col*3+2],pixelmatrix[row][col*3+1],pixelmatrix[row][col*3]) - 128; } } } #endif #define RGB2Y(r, g, b) (((66*r + 129*g + 25*b + 128)>>8)+128) #define RGB2Cr(r, g, b) (((-38*r - 74*g + 112*b + 128)>>8)+128) #define RGB2Cb(r, g, b) (((112*r - 94*g - 18*b + 128)>>8)+128) void RGB2Y_matrix(signed char pixelmatrix[MATRIX_SIZE][MATRIX_SIZE*3],signed char YUVMatrix[MATRIX_SIZE][MATRIX_SIZE]) { unsigned int row, col, col_3; for(row = 0;row < MATRIX_SIZE; row++) { for(col = 0, col_3=0; col < MATRIX_SIZE; col++, col_3+=3) { pixelmatrix[row][col_3] -= 128; pixelmatrix[row][col_3+1] -= 128; pixelmatrix[row][col_3+2] -= 128; YUVMatrix[row][col] = RGB2Y(pixelmatrix[row][col_3+2],pixelmatrix[row][col_3+1],pixelmatrix[row][col_3]) - 128; } } } void RGB2Cr_matrix(signed char pixelmatrix[MATRIX_SIZE][MATRIX_SIZE*3],signed char YUVMatrix[MATRIX_SIZE][MATRIX_SIZE]) { unsigned int row, col, col_3; for(row = 0;row < MATRIX_SIZE; row++) { for(col = 0, col_3=0; col < MATRIX_SIZE; col++, col_3+=3) { YUVMatrix[row][col] = RGB2Cr(pixelmatrix[row][col_3+2],pixelmatrix[row][col_3+1],pixelmatrix[row][col_3]) - 128; } } } void RGB2Cb_matrix(signed char pixelmatrix[MATRIX_SIZE][MATRIX_SIZE*3],signed char YUVMatrix[MATRIX_SIZE][MATRIX_SIZE]) { unsigned int row, col, col_3; for(row = 0;row < MATRIX_SIZE; row++) { for(col = 0, col_3; col < MATRIX_SIZE; col++, col_3) { YUVMatrix[row][col] = RGB2Cb(pixelmatrix[row][col_3+2],pixelmatrix[row][col_3+1],pixelmatrix[row][col_3]) - 128; } } }
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