沒改動fdct coeffient
PSNR_Y = 42.110138
PSNR_Cb = 41.141102
PSNR_Cr = 41.141102

#define IDCT_COEFF_1 724 //1024 * 0.707106781
#define IDCT_COEFF_2 392 //1024 * 0.382683433
#define IDCT_COEFF_3 554 //1024 * 0.541196100
#define IDCT_COEFF_4 1338 //1024 * 1.306562965

改動fdct coeffient
#define IDCT_COEFF_3 512 代替 554

PSNR_Y = 42.110138
PSNR_Cb = 41.141102
PSNR_Cr = 41.141102

#define IDCT_COEFF_2 256 代替 392 
PSNR_Y = 32.567177
PSNR_Cb = 40.349091
PSNR_Cr = 40.349091

#define IDCT_COEFF_2 512 代替 392 
PSNR_Y = 33.506355
PSNR_Cb = 40.349091
PSNR_Cr = 40.349091