您的位置：首页 > 编程语言 > Java开发

YUV转RGB的相关函数

2012-08-29 18:24 477 查看

YUV RGB 转换的函数很有帮助的。

转：http://mintelong.javaeye.com/blog/460780

[b][java]
view plaincopy[/b]

1.  static void ccvt_420p_rgb565(int width, int height, const unsigned char *src, __u16 *dst)
2.  {
3.  int line, col, linewidth;
4.  int y, u, v, yy, vr, ug, vg, ub;
5.  int r, g, b;
6.  const unsigned char *py, *pu, *pv;
7.
8.  linewidth = width >> 1;
9.  py = src;
10. pu = py + (width * height);
11. pv = pu + (width * height) / 4;
12.
13. y = *py++;
14. yy = y << 8;
15. u = *pu - 128;
16. ug =   88 * u;
17. ub = 454 * u;
18. v = *pv - 128;
19. vg = 183 * v;
20. vr = 359 * v;
21.
22. for (line = 0; line < height; line++) {
23.    for (col = 0; col < width; col++) {
24.     r = (yy +      vr) >> 8;
25.     g = (yy - ug - vg) >> 8;
26.     b = (yy + ub     ) >> 8;
27.
28.     if (r < 0)   r = 0;
29.     if (r > 255) r = 255;
30.     if (g < 0)   g = 0;
31.     if (g > 255) g = 255;
32.     if (b < 0)   b = 0;
33.     if (b > 255) b = 255;
34.    *dst++ = (((__u16)r>>3)<<11) | (((__u16)g>>2)<<5) | (((__u16)b>>3)<<0);
35.
36.     y = *py++;
37.     yy = y << 8;
38.     if (col & 1) {
39.      pu++;
40.      pv++;
41.
42.      u = *pu - 128;
43.      ug =   88 * u;
44.      ub = 454 * u;
45.      v = *pv - 128;
46.      vg = 183 * v;
47.      vr = 359 * v;
48.     }
49.    } /* ..for col */
50.    if ((line & 1) == 0) { // even line: rewind
51.     pu -= linewidth;
52.     pv -= linewidth;
53.    }
54. } /* ..for line */
55. }

YUV422 ---->>RGB565的

[b][java]
view plaincopy[/b]

#define YCbCrtoR(Y,Cb,Cr) (1000*Y + 1371*(Cr-128))/1000
#define YCbCrtoG(Y,Cb,Cr) (1000*Y - 336*(Cb-128) - 698*(Cr-128))/1000
#define YCbCrtoB(Y,Cb,Cr) (1000*Y + 1732*(Cb-128))/1000
#define min(x1, x2)   (((x1)<(x2))?(x1):(x2))

__u32 Conv_YCbCr_Rgb(__u8 y0, __u8 y1, __u8 cb0, __u8 cr0)
{
// bit order is
// YCbCr = [Cr0 Y1 Cb0 Y0], RGB=[R1,G1,B1,R0,G0,B0].

int r0, g0, b0, r1, g1, b1;
__u16 rgb0, rgb1;
__u32 rgb;

#if 1 // 4 frames/s @192MHz, 12MHz ; 6 frames/s @450MHz, 12MHz
r0 = YCbCrtoR(y0, cb0, cr0);
g0 = YCbCrtoG(y0, cb0, cr0);
b0 = YCbCrtoB(y0, cb0, cr0);
r1 = YCbCrtoR(y1, cb0, cr0);
g1 = YCbCrtoG(y1, cb0, cr0);
b1 = YCbCrtoB(y1, cb0, cr0);
#endif

if (r0>255 ) r0 = 255;
if (r0<0) r0 = 0;
if (g0>255 ) g0 = 255;
if (g0<0) g0 = 0;
if (b0>255 ) b0 = 255;
if (b0<0) b0 = 0;

if (r1>255 ) r1 = 255;
if (r1<0) r1 = 0;
if (g1>255 ) g1 = 255;
if (g1<0) g1 = 0;
if (b1>255 ) b1 = 255;
if (b1<0) b1 = 0;

// 5:6:5 16bit format
rgb0 = (((__u16)r0>>3)<<11) | (((__u16)g0>>2)<<5) | (((__u16)b0>>3)<<0); //RGB565.
rgb1 = (((__u16)r1>>3)<<11) | (((__u16)g1>>2)<<5) | (((__u16)b1>>3)<<0); //RGB565.

rgb = (rgb1<<16) | rgb0;

return(rgb);
}

内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理

标签： dst java

相关文章推荐

新的分享

章节导航