YUV像素和RGB之间的转换

天云上人

RGB转成YUV(RGB to YUV Conversion)
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) + 128YUV转成RGB(YUV to RGB Conversion)
' N% E! k! T' m3 m9 CB = 1.164(Y - 16)                   + 2.018(U - 128)
G = 1.164(Y - 16) - 0.813(V - 128) - 0.391(U - 128)
" `( G, O5 i# \R = 1.164(Y - 16) + 1.596(V - 128)
R, G, B, Y , Cr, Cb的取值范围都是[0，255].

原文：http://www.rosoo.net/a/200604/6049.html

天云上人

//YUY2视频转化RGB格式 by hardy 2007-10-17
& B4 W9 ~7 {& N$ v//http://www.fourcc.org/fccyvrgb.php
& U: {+ [% U+ V3 _2 _/ n$ K3 Ninline void YUY2_RGB(BYTE *YUY2buff,BYTE *RGBbuff,DWORD dwSize)
{
//B = 1.164(Y - 16)         + 2.018(U - 128)
/ D( [1 S% x7 j/ d9 [& ?//G = 1.164(Y - 16) - 0.813(V - 128) - 0.391(U - 128)
$ \* l$ f( |, _1 Z( f" o//R = 1.164(Y - 16) + 1.596(V - 128)
3 w, r& s7 c8 I$ N9 CBYTE *orgRGBbuff = RGBbuff;
for(DWORD count=0;count<dwSize;count+=4)
: o7 A; ?& U; Z$ v9 z/ H7 E; A{
1 v$ s- V; _: T) z! D//Y0 U0 Y1 V0
, O9 r3 f& b1 Cfloat Y0 = *YUY2buff;
float U = *(++YUY2buff);
float Y1 = *(++YUY2buff);
float V = *(++YUY2buff);
0 O! ^, h. ?- J( y, m++YUY2buff;
*(RGBbuff) =   (BYTE)(Y0 + (1.370705 * (V-128)));           
*(++RGBbuff) = (BYTE)(Y0 - (0.698001 * (V-128)) - (0.337633 * (U-128)));   
# J1 }& @' q+ h) D# R. L*(++RGBbuff) = (BYTE)(Y0 + (1.732446 * (U-128)));        
! k& @- |& b6 w: d  n  j+ f* y4 Y*(++RGBbuff) = (BYTE)(Y1 + (1.370705 * (V-128)));           
*(++RGBbuff) = (BYTE)(Y1 - (0.698001 * (V-128)) - (0.337633 * (U-128)));   
*(++RGBbuff) = (BYTE)(Y1 + (1.732446 * (U-128)));         
# j; ]4 A" H% d( L, x3 a$ I5 s. `++RGBbuff;
' J5 v! L+ Y6 x2 g! r/ g}
1 M3 T8 L& ]1 ^! X5 S! ~2 X( I}
9 ^: r+ z+ N$ Z$ ?: z* T7 Iinline void YUY2_RGB2(BYTE *YUY2buff,BYTE *RGBbuff,DWORD dwSize)
{
//R = Y + 1.14V
//G = Y - 0.39U - 0.58V
1 r8 n4 b$ {7 x! ]1 u//B = Y + 2.03U
// R = Y + 1.403V'
: N& n  c# l5 P9 r$ p4 H! t$ ]//G = Y - 0.344U' - 0.714V'
( Q* X  y8 N- C9 Y: ~" M9 N3 o: E//B = Y + 1.770U'
BYTE *orgRGBbuff = RGBbuff;
6 H* d) ?) M5 a% s* R1 x. p5 nfor(DWORD count=0;count<dwSize;count+=4)
* q. G6 u8 A! L; l3 f$ p{
4 [: x( v% J7 D9 \/ Y$ `# F% o2 d. E: O3 o//Y0 U0 Y1 V0
% d+ _5 r8 N# Y; g( ^9 Z& Ffloat Y0 = *YUY2buff;
float U = *(++YUY2buff);
/ Z( w9 g( [3 }( X9 V% efloat Y1 = *(++YUY2buff);
float V = *(++YUY2buff);
++YUY2buff;
float R,G,B;

R = (Y0 + 1.14f*V);
G=(Y0 - 0.39f*U-0.58f*V);   
B=(Y0 +2.03f*U);
: Y5 h8 ]/ f& V/ Z. B4 [if(R<0) R =0;
! F( _; f( {2 d0 b+ a1 u; Nif(R>255) R=255;
) y; O( H% |' K' j8 `4 p# Bif(G<0) G =0;
5 z7 h& n2 }7 ?! q( Xif(G>255) G=255;
if(B<0) B =0;
if(B>255) B=255;
*(RGBbuff) =     (BYTE)B;         
* x# D  V. d0 ?*(++RGBbuff) = (BYTE)G;
*(++RGBbuff) = (BYTE)R;
R = (Y1 + 1.14f*V);
* E$ |- d! N2 O  `G=(Y1 - 0.39f*U-0.58f*V);   
7 m! c% v, u+ j+ @0 zB=(Y1 +2.03f*U)   ;
) F. j1 O( S$ I0 d. b! j. Qif(R<0) R =0;
if(R>255) R=255;
if(G<0) G =0;
0 {8 Q1 W" G! [, l0 L/ s6 jif(G>255) G=255;
if(B<0) B =0;
if(B>255) B=255;
*(++RGBbuff) =     (BYTE)B;         
; Z  H. w, }+ |, {9 N*(++RGBbuff) = (BYTE)G;
1 V$ R- c+ X, F0 P. I*(++RGBbuff) = (BYTE)R;
++RGBbuff;
}
2 P; {# ?- r& E0 P' q}
$ C' [$ o* M5 j# t; Y* I2 w% Uinline void YUY2_RGB4(BYTE *YUY2buff,BYTE *RGBbuff,DWORD dwSize)
! U# A0 n, A( }6 x! B% w! E{

// R = Y + 1.403V'
//G = Y - 0.344U' - 0.714V'
) x7 E( j+ j3 ]$ U  D+ b9 Q2 v//B = Y + 1.770U'
BYTE *orgRGBbuff = RGBbuff;
for(DWORD count=0;count<dwSize;count+=4)
( f+ d8 p8 d/ w: v' l{
//Y0 U0 Y1 V0
& _+ c( h$ U  X2 Z0 i5 Rfloat Y0 = *YUY2buff;
float U = *(++YUY2buff);
float Y1 = *(++YUY2buff);
float V = *(++YUY2buff);
++YUY2buff;
float R,G,B;

R = (Y0 + 1.403f*V);
! u  n( N& j; o8 k4 X" jG=(Y0 - 0.344f*U-0.714f*V);   
B=(Y0 +1.77f*U);
if(R<0) R =0;
if(R>255) R=255;
if(G<0) G =0;
0 K3 V3 o& O& @/ \if(G>255) G=255;
! Z6 |" V( T2 Z$ ?) H/ {- Pif(B<0) B =0;
, A1 p4 X7 Q& g1 E) q! `: P( gif(B>255) B=255;
*(RGBbuff) =     (BYTE)R;         
, x$ {. i. f; g  O$ [/ [0 d*(++RGBbuff) = (BYTE)G;
*(++RGBbuff) = (BYTE)B;
: q6 w2 M9 n9 L5 ^! u. |/ u& K5 p0 O0 m9 ~R = (Y1 + 1.403f*V);
" Q, s3 S3 A. XG=(Y1 - 0.344f*U-0.714f*V);   
/ d4 \# x2 V6 R# N3 ZB=(Y1 +1.77f*U);
" @  M+ y" G/ ^* x8 }& Wif(R<0) R =0;
if(R>255) R=255;
if(G<0) G =0;
if(G>255) G=255;
& ]/ g  {8 K' {4 C6 n1 Xif(B<0) B =0;
" K7 ^6 l! }& a! Gif(B>255) B=255;
, f4 }# ?/ ?6 n5 F3 O1 Z*(++RGBbuff) =     (BYTE)R;         
3 c- a; @8 j1 Q  |*(++RGBbuff) = (BYTE)G;
*(++RGBbuff) = (BYTE)B;
++RGBbuff;
8 a% A, i( i* s* M! W}
}
' l, _; \5 I" a, x1 L% K, U! |2 Ginline void YUY2_RGB3(BYTE *YUY2buff,BYTE *RGBbuff,DWORD dwSize)
; n1 v. g8 c8 \{
/ T/ s- n3 w: _. }' n. X//B = 1.164(Y - 16)         + 2.018(U - 128)
- {( g% b) d- y+ @//G = 1.164(Y - 16) - 0.813(V - 128) - 0.391(U - 128)
//R = 1.164(Y - 16) + 1.596(V - 128)
3 M) c9 f, O- _7 TBYTE *orgRGBbuff = RGBbuff;
for(DWORD count=0;count<dwSize;count+=4)
{
5 g# q9 z8 J5 i' m//Y0 U0 Y1 V0
float Y0 = *YUY2buff;
1 e1 g9 D% `; Y3 w& V' ifloat U = *(++YUY2buff);
) s. ]- w" ?4 L6 y8 c! L' vfloat Y1 = *(++YUY2buff);
4 u$ o* c, |6 @$ h1 R& z9 Nfloat V = *(++YUY2buff);
! u  d$ K/ Q! q5 N++YUY2buff;
) k, s' ?: C. O, `: u, o*(RGBbuff) =   (BYTE)(1.164f*(Y0 - 16)+ 2.018f*(U - 128));           
  I6 [' J8 i) t/ f- Y*(++RGBbuff) = (BYTE)(1.164f*(Y0 - 16) - 0.813f*(V - 128) - 0.391f*(U - 128));   
*(++RGBbuff) = (BYTE)(1.164f*(Y0 - 16) + 1.596f*(V - 128));        
  M- V- `% s* f- B  q*(++RGBbuff) =   (BYTE)(1.164f*(Y0 - 16)+ 2.018f*(U - 128));           
. Z1 R" c+ H$ t*(++RGBbuff) = (BYTE)(1.164f*(Y0 - 16) - 0.813f*(V - 128) - 0.391f*(U - 128));   
*(++RGBbuff) = (BYTE)(1.164f*(Y0 - 16) + 1.596f*(V - 128));         
++RGBbuff;
- x$ n, [; S% G1 c) M
" L$ P' q( Z# Z& Z5 @}
( M  L) K; u) k# ]1 _7 h}
// http://msdn2.microsoft.com/en-us/library/ms893078.aspx
+ I- n+ G/ U' R1 B  H8 ^6 Fvoid VC4000Graber::YUY2_RGB(BYTE *YUY2buff,BYTE *RGBbuff,DWORD dwSize)
{
//
//C = Y - 16
//D = U - 128
3 w" C9 d- r5 Q: H/ D1 {0 ^% h% B//E = V - 128
//R = clip(( 298 * C           + 409 * E + 128) >> 8)
//G = clip(( 298 * C - 100 * D - 208 * E + 128) >> 8)
//B = clip(( 298 * C + 516 * D           + 128) >> 8)
5 X& F. _7 G% a4 ]' L6 c: c4 J. HBYTE *orgRGBbuff = RGBbuff;
  e  k% o& L1 k+ W2 B: G% K0 afor(DWORD count=0;count<dwSize;count+=4)
' ]4 v+ O1 k! L{
//Y0 U0 Y1 V0
& B* H* P4 U# Z& v6 sBYTE Y0 = *YUY2buff;
BYTE U = *(++YUY2buff);
BYTE Y1 = *(++YUY2buff);
4 a) z  _# r/ U5 ~9 {( ~BYTE V = *(++YUY2buff);
++YUY2buff;
/ y" `" L: Y6 y7 d0 N: y- VLONG Y,C,D,E;
: k5 N( K1 E1 z4 c% O  [BYTE R,G,B;
! ?' c5 R' N9 G0 K' ?" p, }# n# ?
( a# E2 k0 K; i) S  AY = Y0;
( S! j6 L2 T" gC = Y-16;
D = U-128;
E = V-128;
R = clip255(( 298 * C           + 409 * E + 128) >> 8);
% @! q' t' d4 q9 k+ t: o7 YG = clip255(( 298 * C - 100 * D - 208 * E + 128) >> 8);
B = clip255(( 298 * C + 516 * D           + 128) >> 8);
4 g' Y7 E$ N1 {*(RGBbuff) =   B;           
# D9 d8 Q/ \$ O3 o, s*(++RGBbuff) = G;   
! @1 X; c% j; t# O*(++RGBbuff) = R;        
8 i9 ~) m& A+ w* `/ M+ Z2 jY = Y1;
1 }4 q/ d+ I' I# T6 C( w0 PC = Y-16;
6 ^) s- L# q- |% Y* ?/ DD = U-128;
3 O- E: e# ], U/ ^E = V-128;
% Q* O) r" }; X# hR = clip255(( 298 * C           + 409 * E + 128) >> 8);
: f- O! J3 ?' UG = clip255(( 298 * C - 100 * D - 208 * E + 128) >> 8);
1 X4 _" i# A3 @  @6 O+ s8 }; vB = clip255(( 298 * C + 516 * D           + 128) >> 8);
*(++RGBbuff) =   B;           
: P# E9 K2 o$ I: `*(++RGBbuff) = G;   
*(++RGBbuff) = R;         
++RGBbuff;

" z7 V9 }, h3 i2 b}
}
! ~$ q+ W' X, h( D- e% O# BBYTE VC4000Graber::clip255(LONG v)
{
7 a9 T, E$ d7 v, ]3 _if(v<0) v=0;
# i" J: \7 H7 q! g- uelse if(v>255) v=255;
" |5 x& S5 Y# n' S2 G( Q3 Jreturn (BYTE)v;
9 z' y+ {- O" A/ z/ ~& T}

/ x4 }/ }; D' }4 j; Q, W本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/hardVB/archive/2007/10/18/1831810.aspx
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