如何在 C/C++ 中执行 RGB->YUV 转换？
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How to perform RGB->YUV conversion in C/C++?
提问by Rella
How to perform RGB->YUV conversion in C/C++?
如何在 C/C++ 中执行 RGB->YUV 转换？
I have some Bitmap.. RGB I need to convert it to YUV
我有一些位图.. RGB 我需要将它转换为 YUV
Libs? Tuts? Articles?
图书馆？啧啧？文章？
采纳答案by John Paulett
回答by Leszek Szary
You might also want to try these integer only calculations (should be faster than floats)
您可能还想尝试这些仅限整数的计算（应该比浮点数快）
#define CLIP(X) ( (X) > 255 ? 255 : (X) < 0 ? 0 : X)
// RGB -> YUV
#define RGB2Y(R, G, B) CLIP(( ( 66 * (R) + 129 * (G) + 25 * (B) + 128) >> 8) + 16)
#define RGB2U(R, G, B) CLIP(( ( -38 * (R) - 74 * (G) + 112 * (B) + 128) >> 8) + 128)
#define RGB2V(R, G, B) CLIP(( ( 112 * (R) - 94 * (G) - 18 * (B) + 128) >> 8) + 128)
// YUV -> RGB
#define C(Y) ( (Y) - 16 )
#define D(U) ( (U) - 128 )
#define E(V) ( (V) - 128 )
#define YUV2R(Y, U, V) CLIP(( 298 * C(Y) + 409 * E(V) + 128) >> 8)
#define YUV2G(Y, U, V) CLIP(( 298 * C(Y) - 100 * D(U) - 208 * E(V) + 128) >> 8)
#define YUV2B(Y, U, V) CLIP(( 298 * C(Y) + 516 * D(U) + 128) >> 8)
// RGB -> YCbCr
#define CRGB2Y(R, G, B) CLIP((19595 * R + 38470 * G + 7471 * B ) >> 16)
#define CRGB2Cb(R, G, B) CLIP((36962 * (B - CLIP((19595 * R + 38470 * G + 7471 * B ) >> 16) ) >> 16) + 128)
#define CRGB2Cr(R, G, B) CLIP((46727 * (R - CLIP((19595 * R + 38470 * G + 7471 * B ) >> 16) ) >> 16) + 128)
// YCbCr -> RGB
#define CYCbCr2R(Y, Cb, Cr) CLIP( Y + ( 91881 * Cr >> 16 ) - 179 )
#define CYCbCr2G(Y, Cb, Cr) CLIP( Y - (( 22544 * Cb + 46793 * Cr ) >> 16) + 135)
#define CYCbCr2B(Y, Cb, Cr) CLIP( Y + (116129 * Cb >> 16 ) - 226 )
回答by Esteban Küber
Check this article: http://www.fourcc.org/fccyvrgb.phpConversion is quite easy so you probably could write your own function based on this
查看这篇文章：http: //www.fourcc.org/fccyvrgb.php转换非常简单，因此您可能可以基于此编写自己的函数
Y = (0.257 * R) + (0.504 * G) + (0.098 * B) + 16
Cr = V = (0.439 * R) - (0.368 * G) - (0.071 * B) + 128
Cb = U = -(0.148 * R) - (0.291 * G) + (0.439 * B) + 128
