YUV转RGB的相关函数-白红宇

YUV转RGB的相关函数

阅读量：2383 次

发布时间：2019-05-10

本文共 2392 字，大约阅读时间需要 7 分钟。

YUV RGB 转换的函数很有帮助的。

转：

[java]

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;

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

[java]

#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);

}

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