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
( p7 S# ^$ u, Z  X  R/ @Cb = U = -(0.148 * R) - (0.291 * G) + (0.439 * B) + 128YUV转成RGB(YUV to RGB Conversion)
B = 1.164(Y - 16)                   + 2.018(U - 128)
G = 1.164(Y - 16) - 0.813(V - 128) - 0.391(U - 128)
) T  V- A) H8 [! oR = 1.164(Y - 16) + 1.596(V - 128)
R, G, B, Y , Cr, Cb的取值范围都是[0，255].

+ k+ ]: X- w+ e* S- B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
//http://www.fourcc.org/fccyvrgb.php
inline void YUY2_RGB(BYTE *YUY2buff,BYTE *RGBbuff,DWORD dwSize)
  M: R* t. s! {6 E& ^/ M2 z6 D{
//B = 1.164(Y - 16)         + 2.018(U - 128)
! R8 _: L/ L6 e% R) G+ H//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;
6 s- g! w" e7 a. ^( Vfor(DWORD count=0;count<dwSize;count+=4)
/ Z) y' c3 r. I$ T! J! D. C" j{
//Y0 U0 Y1 V0
: i" ^# t5 Y* r  i  E! a. x0 yfloat Y0 = *YUY2buff;
float U = *(++YUY2buff);
  t& \7 ~& K- ^float Y1 = *(++YUY2buff);
float V = *(++YUY2buff);
) `0 }5 c& N, U1 ^6 [++YUY2buff;
*(RGBbuff) =   (BYTE)(Y0 + (1.370705 * (V-128)));           
$ @, Y& ?# o( L. b# Q*(++RGBbuff) = (BYTE)(Y0 - (0.698001 * (V-128)) - (0.337633 * (U-128)));   
& E  \, `8 A: }*(++RGBbuff) = (BYTE)(Y0 + (1.732446 * (U-128)));        
*(++RGBbuff) = (BYTE)(Y1 + (1.370705 * (V-128)));           
9 f% H6 D( _+ G: U*(++RGBbuff) = (BYTE)(Y1 - (0.698001 * (V-128)) - (0.337633 * (U-128)));   
5 f% y2 _( I1 \% g1 _*(++RGBbuff) = (BYTE)(Y1 + (1.732446 * (U-128)));         
++RGBbuff;
}
}
inline void YUY2_RGB2(BYTE *YUY2buff,BYTE *RGBbuff,DWORD dwSize)
{
//R = Y + 1.14V
7 t% F; d0 I2 m" k$ [0 [7 p( ]& m//G = Y - 0.39U - 0.58V
% e) }& r7 v2 E/ @//B = Y + 2.03U
// R = Y + 1.403V'
//G = Y - 0.344U' - 0.714V'
0 V2 k' S: {( h, }4 K, q. p/ Z" N//B = Y + 1.770U'
BYTE *orgRGBbuff = RGBbuff;
for(DWORD count=0;count<dwSize;count+=4)
1 t2 ^% F8 j& e6 }{
8 [/ T2 }/ w, R6 T) D+ i7 C2 c//Y0 U0 Y1 V0
9 \/ h7 ]% `, yfloat Y0 = *YUY2buff;
4 V4 {5 B/ b+ G3 D' U- Z9 c- ^float U = *(++YUY2buff);
float Y1 = *(++YUY2buff);
6 v4 P: X1 \% |  k& P  Rfloat V = *(++YUY2buff);
% n! q% p- Y" K3 y++YUY2buff;
float R,G,B;
, L  @7 W0 |* Y* Q) T* P+ l
R = (Y0 + 1.14f*V);
G=(Y0 - 0.39f*U-0.58f*V);   
B=(Y0 +2.03f*U);
if(R<0) R =0;
7 g! v7 Z. \& Q: t" |if(R>255) R=255;
  n% t( R% d' E5 _0 H6 V: e4 b3 Jif(G<0) G =0;
if(G>255) G=255;
if(B<0) B =0;
" h. A6 G( c) M' N" d6 Fif(B>255) B=255;
! g2 I. ~9 d2 P4 F*(RGBbuff) =     (BYTE)B;         
*(++RGBbuff) = (BYTE)G;
% J3 @5 }! n7 C2 i: b8 |7 i1 |; Q* \*(++RGBbuff) = (BYTE)R;
R = (Y1 + 1.14f*V);
, V) X  O" t- E' k& dG=(Y1 - 0.39f*U-0.58f*V);   
$ v1 E3 d% k0 ~3 RB=(Y1 +2.03f*U)   ;
9 T. U  v8 y+ q2 q* Fif(R<0) R =0;
! D* U7 [' ]& u  dif(R>255) R=255;
' O8 t0 f+ m5 r- N  Q; eif(G<0) G =0;
if(G>255) G=255;
if(B<0) B =0;
if(B>255) B=255;
*(++RGBbuff) =     (BYTE)B;         
*(++RGBbuff) = (BYTE)G;
& }' c1 }, a7 j2 I2 X& D$ `*(++RGBbuff) = (BYTE)R;
6 V' N3 {( d3 k% W++RGBbuff;
  h9 m5 O8 ~) v' p# E$ {}
}
inline void YUY2_RGB4(BYTE *YUY2buff,BYTE *RGBbuff,DWORD dwSize)
4 I) E/ {+ a6 W; q5 c- C, D{
+ }+ Q. A2 ?/ Y: m, N/ T* T" P
* Y+ r! G/ w# [; }2 ~/ t// R = Y + 1.403V'
( Y: |# A% P$ L8 Q" J//G = Y - 0.344U' - 0.714V'
//B = Y + 1.770U'
BYTE *orgRGBbuff = RGBbuff;
8 }  k" M: K) s- L, ]+ f$ ]for(DWORD count=0;count<dwSize;count+=4)
{
2 X2 ]0 L' K3 T4 \; f  F9 R//Y0 U0 Y1 V0
* g% P, \/ B5 k3 X2 v- pfloat Y0 = *YUY2buff;
float U = *(++YUY2buff);
float Y1 = *(++YUY2buff);
float V = *(++YUY2buff);
- E: A7 b' L1 ^2 K6 M++YUY2buff;
float R,G,B;
) y+ S. F$ M! D  x9 Q7 Y5 B
& q8 a5 a# K. M! \6 I( W! P* XR = (Y0 + 1.403f*V);
1 A) f1 ?- c0 [" q4 n* tG=(Y0 - 0.344f*U-0.714f*V);   
B=(Y0 +1.77f*U);
if(R<0) R =0;
if(R>255) R=255;
$ Y/ G+ s2 p/ S2 i; l! `3 h0 mif(G<0) G =0;
if(G>255) G=255;
) Q& w! [  r3 M4 O8 u7 Lif(B<0) B =0;
if(B>255) B=255;
*(RGBbuff) =     (BYTE)R;         
*(++RGBbuff) = (BYTE)G;
*(++RGBbuff) = (BYTE)B;
R = (Y1 + 1.403f*V);
( S' @3 X+ h0 N% }G=(Y1 - 0.344f*U-0.714f*V);   
B=(Y1 +1.77f*U);
if(R<0) R =0;
6 W6 F; a2 A/ A  {% }: oif(R>255) R=255;
if(G<0) G =0;
if(G>255) G=255;
if(B<0) B =0;
if(B>255) B=255;
/ A$ {3 h, e; S8 k$ z+ r# D& b*(++RGBbuff) =     (BYTE)R;         
*(++RGBbuff) = (BYTE)G;
; Y! s9 S% Z1 }2 k* v+ c*(++RGBbuff) = (BYTE)B;
* o9 m! Q# `1 i9 E) W$ K++RGBbuff;
}
; c& h' [, e: ~; f1 s0 {6 w8 J3 k2 B}
! k7 x% X: N' H+ f4 n( U8 d! sinline void YUY2_RGB3(BYTE *YUY2buff,BYTE *RGBbuff,DWORD dwSize)
: j* H0 h) B" I; ]  U{
//B = 1.164(Y - 16)         + 2.018(U - 128)
  @' @* f; m/ J- c8 c//G = 1.164(Y - 16) - 0.813(V - 128) - 0.391(U - 128)
//R = 1.164(Y - 16) + 1.596(V - 128)
. {/ D& V4 C& w; m0 e  L2 m' \( nBYTE *orgRGBbuff = RGBbuff;
for(DWORD count=0;count<dwSize;count+=4)
{
//Y0 U0 Y1 V0
float Y0 = *YUY2buff;
; o- L8 R* r4 E% v, efloat U = *(++YUY2buff);
8 e- l# F3 ]1 x1 Xfloat Y1 = *(++YUY2buff);
float V = *(++YUY2buff);
++YUY2buff;
9 U  I" n4 b, @7 V( e*(RGBbuff) =   (BYTE)(1.164f*(Y0 - 16)+ 2.018f*(U - 128));           
*(++RGBbuff) = (BYTE)(1.164f*(Y0 - 16) - 0.813f*(V - 128) - 0.391f*(U - 128));   
' I. E% f  Q3 `0 B/ I& S+ ~, [3 ~' J% x*(++RGBbuff) = (BYTE)(1.164f*(Y0 - 16) + 1.596f*(V - 128));        
*(++RGBbuff) =   (BYTE)(1.164f*(Y0 - 16)+ 2.018f*(U - 128));           
*(++RGBbuff) = (BYTE)(1.164f*(Y0 - 16) - 0.813f*(V - 128) - 0.391f*(U - 128));   
. Q9 Z9 x! l9 V*(++RGBbuff) = (BYTE)(1.164f*(Y0 - 16) + 1.596f*(V - 128));         
++RGBbuff;
6 e. w/ o6 y* ?9 G8 S, E8 |
. h. ~  y! g7 A5 D}
) ]' v3 V; B* C- |# p# S}
2 {9 e2 N. a* B) E2 k! G// http://msdn2.microsoft.com/en-us/library/ms893078.aspx
3 g& r7 z) p* c7 Y9 w- b. Bvoid VC4000Graber::YUY2_RGB(BYTE *YUY2buff,BYTE *RGBbuff,DWORD dwSize)
" \; J1 n- F3 I  @{
//
- c! s0 T& C; }: r, A& ]" e+ t//C = Y - 16
6 C7 \, _$ q4 H//D = U - 128
$ g1 [. c1 k" |1 a2 c5 u2 u//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)
& y* s1 M" B, Q; [BYTE *orgRGBbuff = RGBbuff;
for(DWORD count=0;count<dwSize;count+=4)
{
//Y0 U0 Y1 V0
BYTE Y0 = *YUY2buff;
BYTE U = *(++YUY2buff);
0 H5 L, [& T# n" oBYTE Y1 = *(++YUY2buff);
BYTE V = *(++YUY2buff);
++YUY2buff;
LONG Y,C,D,E;
BYTE R,G,B;

2 I' d1 F# G  u+ {Y = Y0;
C = Y-16;
6 D5 M( ~/ p+ f8 j! k5 ND = U-128;
E = V-128;
' W8 H+ b6 p+ X% A- iR = clip255(( 298 * C           + 409 * E + 128) >> 8);
G = clip255(( 298 * C - 100 * D - 208 * E + 128) >> 8);
4 q% [  t3 l/ dB = clip255(( 298 * C + 516 * D           + 128) >> 8);
2 g, ?% G* d$ a, r8 `*(RGBbuff) =   B;           
*(++RGBbuff) = G;   
/ h6 {5 O4 N7 X' n4 C*(++RGBbuff) = R;        
Y = Y1;
: p9 Q* F+ T$ J2 x& O) WC = Y-16;
* A( ~4 L1 U' g7 ]5 x: {D = 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);
. ^) K& V; ^3 r# u+ |5 P*(++RGBbuff) =   B;           
: |* O; J' W$ D% J  J8 a*(++RGBbuff) = G;   
+ `! x9 e  c1 s; W0 V# B& V8 k*(++RGBbuff) = R;         
& u. u# \+ _4 v% t4 v6 B- [++RGBbuff;
) P7 C* b8 d9 ^* f# h5 Q5 j; \
}
& C3 j2 t3 G6 w0 P. b}
' c$ q' h0 \$ l4 E' d" eBYTE VC4000Graber::clip255(LONG v)
{
2 P9 s7 h4 a) W1 B& q) X" d4 wif(v<0) v=0;
else if(v>255) v=255;
+ S; a( W: C3 V8 V2 freturn (BYTE)v;
}

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