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
' p& I0 U! i3 X: r0 F4 M" d4 tCr = 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)
& q# M2 z- G" N3 B2 gB = 1.164(Y - 16)                   + 2.018(U - 128)
( k8 F5 u+ u" i5 z% X7 q" ZG = 1.164(Y - 16) - 0.813(V - 128) - 0.391(U - 128)
/ ^( r+ a; X% |7 j) t" T; jR = 1.164(Y - 16) + 1.596(V - 128)
6 J" i$ t/ k3 M5 L. z/ ]+ L# oR, G, B, Y , Cr, Cb的取值范围都是[0，255].

0 R2 c, [. p. M) w) L4 m4 ^原文：http://www.rosoo.net/a/200604/6049.html
% D" Z  w# C' C6 j) p

天云上人

//YUY2视频转化RGB格式 by hardy 2007-10-17
0 s$ a  [  F! n2 a//http://www.fourcc.org/fccyvrgb.php
inline void YUY2_RGB(BYTE *YUY2buff,BYTE *RGBbuff,DWORD dwSize)
{
9 `, H4 s/ R& }& q' }$ X//B = 1.164(Y - 16)         + 2.018(U - 128)
//G = 1.164(Y - 16) - 0.813(V - 128) - 0.391(U - 128)
//R = 1.164(Y - 16) + 1.596(V - 128)
BYTE *orgRGBbuff = RGBbuff;
7 V4 ]6 Q+ T$ [# K1 P$ L  bfor(DWORD count=0;count<dwSize;count+=4)
# ^& J" Y% S1 z, \{
//Y0 U0 Y1 V0
float Y0 = *YUY2buff;
float U = *(++YUY2buff);
float Y1 = *(++YUY2buff);
4 ?; K: r! u. L+ `float V = *(++YUY2buff);
8 J/ h+ ^" |/ @4 {- ~++YUY2buff;
*(RGBbuff) =   (BYTE)(Y0 + (1.370705 * (V-128)));           
*(++RGBbuff) = (BYTE)(Y0 - (0.698001 * (V-128)) - (0.337633 * (U-128)));   
& e  k7 z( e. F* O7 I# [6 X( P*(++RGBbuff) = (BYTE)(Y0 + (1.732446 * (U-128)));        
*(++RGBbuff) = (BYTE)(Y1 + (1.370705 * (V-128)));           
+ ]/ a' l0 C! {; s, n*(++RGBbuff) = (BYTE)(Y1 - (0.698001 * (V-128)) - (0.337633 * (U-128)));   
! `+ V9 S7 ~2 _4 q# ]*(++RGBbuff) = (BYTE)(Y1 + (1.732446 * (U-128)));         
++RGBbuff;
}
8 X3 i$ @& ^" {" V/ A& I, R}
inline void YUY2_RGB2(BYTE *YUY2buff,BYTE *RGBbuff,DWORD dwSize)
; t% p! f+ D0 \* b9 F{
4 Z& V: a' Y; E1 K//R = Y + 1.14V
//G = Y - 0.39U - 0.58V
//B = Y + 2.03U
, O% i5 @2 b( M' G' k* b6 Q// R = Y + 1.403V'
' [, K! u( k* b7 Q$ Q  a4 ?9 s//G = Y - 0.344U' - 0.714V'
//B = Y + 1.770U'
BYTE *orgRGBbuff = RGBbuff;
& A2 y& E. h  \* bfor(DWORD count=0;count<dwSize;count+=4)
{
( E3 \* `* z/ Y' r* N  Q: q2 S+ X//Y0 U0 Y1 V0
3 q$ c6 W$ N8 ~% Y4 B  Dfloat Y0 = *YUY2buff;
  w6 v' {9 b$ mfloat U = *(++YUY2buff);
* ]3 `: F8 }* Gfloat Y1 = *(++YUY2buff);
float V = *(++YUY2buff);
++YUY2buff;
1 P3 K6 g3 o5 g" `float R,G,B;

' v2 K% g( _1 @, GR = (Y0 + 1.14f*V);
G=(Y0 - 0.39f*U-0.58f*V);   
" }& d* |- D6 Y8 R( h2 AB=(Y0 +2.03f*U);
* @3 l( a* N* Y% T. ^$ g& Uif(R<0) R =0;
1 _8 P( W; B" [. ^% _. Uif(R>255) R=255;
if(G<0) G =0;
if(G>255) G=255;
7 S& u4 Y" R0 s$ L! f1 xif(B<0) B =0;
if(B>255) B=255;
4 `* Y' h) |, c*(RGBbuff) =     (BYTE)B;         
3 I  y7 I% k9 j*(++RGBbuff) = (BYTE)G;
# K. ?0 C9 y- F, x  a, Y*(++RGBbuff) = (BYTE)R;
R = (Y1 + 1.14f*V);
- D' X; V3 ~, aG=(Y1 - 0.39f*U-0.58f*V);   
B=(Y1 +2.03f*U)   ;
& j+ y) k" }' E. ?1 o5 j1 h8 L' Uif(R<0) R =0;
% M1 a6 |: F! K0 X" dif(R>255) R=255;
: _: w4 g' @  M# y+ T* V6 Lif(G<0) G =0;
if(G>255) G=255;
if(B<0) B =0;
if(B>255) B=255;
*(++RGBbuff) =     (BYTE)B;         
+ }  H! H6 e$ G, Z, A6 i3 H, U*(++RGBbuff) = (BYTE)G;
*(++RGBbuff) = (BYTE)R;
++RGBbuff;
/ z) a( Y/ s# H! X7 ?( U! x1 H}
. @1 ?1 d; X  S6 w& ^  e}
inline void YUY2_RGB4(BYTE *YUY2buff,BYTE *RGBbuff,DWORD dwSize)
8 _* j' ]$ [7 w( c{

// R = Y + 1.403V'
+ c% o9 b/ d4 Y( @. _6 `7 |//G = Y - 0.344U' - 0.714V'
//B = Y + 1.770U'
3 E& W% X) x3 o. S" z# JBYTE *orgRGBbuff = RGBbuff;
, N4 z4 M, H) O: i9 qfor(DWORD count=0;count<dwSize;count+=4)
{
$ Q# u& e: u) |( K  W5 W/ T//Y0 U0 Y1 V0
float Y0 = *YUY2buff;
float U = *(++YUY2buff);
# Y  B9 P6 P/ l. zfloat Y1 = *(++YUY2buff);
6 E4 L. w. Q, m+ |- Nfloat V = *(++YUY2buff);
3 c4 V1 b5 S1 m3 _' e++YUY2buff;
1 u$ [7 T6 E" k' I: t. @3 b* y' Vfloat R,G,B;
" o5 T6 M: L2 ~
R = (Y0 + 1.403f*V);
; A2 H5 a) Z9 [6 PG=(Y0 - 0.344f*U-0.714f*V);   
8 n& d. Y! j/ X7 o+ Y& w6 n0 NB=(Y0 +1.77f*U);
if(R<0) R =0;
if(R>255) R=255;
if(G<0) G =0;
; R3 ]: r# j% g: eif(G>255) G=255;
if(B<0) B =0;
if(B>255) B=255;
% ^7 y2 f; d# x*(RGBbuff) =     (BYTE)R;         
9 l" X/ z4 M: V; ^8 C$ H8 E*(++RGBbuff) = (BYTE)G;
*(++RGBbuff) = (BYTE)B;
6 O3 p8 T3 `) R- B2 f1 P. m/ rR = (Y1 + 1.403f*V);
G=(Y1 - 0.344f*U-0.714f*V);   
" ?: z5 |0 ]: rB=(Y1 +1.77f*U);
+ s: _" `* V6 ~/ P8 Fif(R<0) R =0;
if(R>255) R=255;
# V- b8 u1 b0 vif(G<0) G =0;
if(G>255) G=255;
) Z$ d/ y/ t, d$ `/ cif(B<0) B =0;
- q4 j3 Q( D' D* X3 Vif(B>255) B=255;
! R0 M* e( d1 {1 B*(++RGBbuff) =     (BYTE)R;         
*(++RGBbuff) = (BYTE)G;
% d6 f$ ~3 v' ~/ \7 `& h; P3 g( c*(++RGBbuff) = (BYTE)B;
' o- V" E+ ?; f" G& d++RGBbuff;
; j, M  B6 K' j4 t' I}
}
* V* I# v- {8 U1 yinline void YUY2_RGB3(BYTE *YUY2buff,BYTE *RGBbuff,DWORD dwSize)
{
//B = 1.164(Y - 16)         + 2.018(U - 128)
//G = 1.164(Y - 16) - 0.813(V - 128) - 0.391(U - 128)
, b/ B1 f6 `  w6 P+ P  J/ H//R = 1.164(Y - 16) + 1.596(V - 128)
BYTE *orgRGBbuff = RGBbuff;
- S0 h0 Z5 k/ r" kfor(DWORD count=0;count<dwSize;count+=4)
( p3 p$ _* i4 l) }: x! r{
) j6 D& i' j' O3 \; x+ u//Y0 U0 Y1 V0
float Y0 = *YUY2buff;
float U = *(++YUY2buff);
! h2 Q/ x) P1 gfloat Y1 = *(++YUY2buff);
float V = *(++YUY2buff);
++YUY2buff;
*(RGBbuff) =   (BYTE)(1.164f*(Y0 - 16)+ 2.018f*(U - 128));           
+ B7 R% C9 N% ~1 m*(++RGBbuff) = (BYTE)(1.164f*(Y0 - 16) - 0.813f*(V - 128) - 0.391f*(U - 128));   
*(++RGBbuff) = (BYTE)(1.164f*(Y0 - 16) + 1.596f*(V - 128));        
- V: G8 P/ C/ X* \2 ^, Q& |*(++RGBbuff) =   (BYTE)(1.164f*(Y0 - 16)+ 2.018f*(U - 128));           
$ n, U& T+ u. b4 D, i7 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;
) C( q8 @+ S2 z4 k: y" ~
}
}
: g( \8 q' V) |. _( i) C// http://msdn2.microsoft.com/en-us/library/ms893078.aspx
9 T4 j' G: V2 {" Fvoid VC4000Graber::YUY2_RGB(BYTE *YUY2buff,BYTE *RGBbuff,DWORD dwSize)
{
0 X( H, Z8 L' A1 T//
//C = Y - 16
//D = U - 128
//E = V - 128
//R = clip(( 298 * C           + 409 * E + 128) >> 8)
, {# z/ m6 }3 M( v6 `//G = clip(( 298 * C - 100 * D - 208 * E + 128) >> 8)
//B = clip(( 298 * C + 516 * D           + 128) >> 8)
BYTE *orgRGBbuff = RGBbuff;
for(DWORD count=0;count<dwSize;count+=4)
4 [6 P0 t* P3 K5 s# P{
# X# Q% o- |. @//Y0 U0 Y1 V0
BYTE Y0 = *YUY2buff;
BYTE U = *(++YUY2buff);
BYTE Y1 = *(++YUY2buff);
: s# d0 }3 R7 o1 {! O! t% W6 G% _BYTE V = *(++YUY2buff);
++YUY2buff;
+ ?: |7 p/ s: z0 {9 qLONG Y,C,D,E;
+ a/ O0 u8 I0 v9 ~5 e% YBYTE R,G,B;
+ V1 t" O# V+ f8 i$ z
Y = Y0;
' [+ H' k- |( g' w7 SC = Y-16;
2 i- K# O- p# R1 T2 S% I2 kD = U-128;
E = V-128;
R = clip255(( 298 * C           + 409 * E + 128) >> 8);
G = clip255(( 298 * C - 100 * D - 208 * E + 128) >> 8);
B = clip255(( 298 * C + 516 * D           + 128) >> 8);
5 R  G; z: _: ^2 r3 y*(RGBbuff) =   B;           
8 Z+ s! A, |3 W$ N) I*(++RGBbuff) = G;   
6 m3 J1 y0 `" t) G. ^$ Q*(++RGBbuff) = R;        
1 }0 n1 n- E: k% Z* n) PY = Y1;
0 x# d3 E4 m1 \4 N6 tC = Y-16;
6 `/ ^) D' S/ ^D = U-128;
E = V-128;
4 b; C6 W# d6 [# [7 x1 F" fR = clip255(( 298 * C           + 409 * E + 128) >> 8);
3 M% D0 t/ C0 R4 b+ M! _' P; _# ^G = clip255(( 298 * C - 100 * D - 208 * E + 128) >> 8);
B = clip255(( 298 * C + 516 * D           + 128) >> 8);
*(++RGBbuff) =   B;           
*(++RGBbuff) = G;   
" q) `) m, c* y*(++RGBbuff) = R;         
( f( D& q2 Z5 k+ _/ K1 ]8 F++RGBbuff;
  K4 f- e: F. \6 I; t
7 o- W+ T$ Z) D; V& d0 D& }}
  e. K3 v7 J7 p& S( d- Z7 a! D4 \}
BYTE VC4000Graber::clip255(LONG v)
{
) d* U6 @- v; j' O6 z( E0 kif(v<0) v=0;
3 X4 j% H7 S& N; t) Kelse if(v>255) v=255;
return (BYTE)v;
}
+ {( }. G( I1 u5 d$ h5 }
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
1 S* w0 \$ H9 Q1 T. y
! n/ x* E) x! d& P