YUV格式转RGB格式

最近做Android下图像处理方面的工作，Android下得到的图像其编码格式为YUV，图像处理需要RGB格式，需要进行转换。下面给出遇到的两类YUV格式转换RGB的代码。

第一种：YUV420SP转RGB

遇到的YUV420SP是这种格式：NV21: YYYYYYYY VUVU 

void YUV420SP2RGB(char *rgbBuf, char *yuv420sp, int width, int height){    int frameSize = width * height;    int i = 0, y = 0;    int uvp = 0, u = 0, v = 0;    int y1192 = 0, r = 0, g = 0, b = 0;    for (int j = 0, yp = 0; j < height; j++)     {        uvp = frameSize + (j >> 1) * width;      u = 0;      v = 0;      for (i = 0; i < width; i++, yp++)         {          y = (0xff & ((int) yuv420sp[yp])) - 16;          if (y < 0) y = 0;          if ((i & 1) == 0)             {          v = (0xff & yuv420sp[uvp++]) - 128;          u = (0xff & yuv420sp[uvp++]) - 128;          }          y1192 = 1192 * y;          r = (y1192 + 1634 * v);          g = (y1192 - 833 * v - 400 * u);          b = (y1192 + 2066 * u);          if (r < 0) r = 0; else if (r > 262143) r = 262143;          if (g < 0) g = 0; else if (g > 262143) g = 262143;          if (b < 0) b = 0; else if (b > 262143) b = 262143;          rgbBuf[yp * 3] = (byte)(r >> 10);          rgbBuf[yp * 3 + 1] = (byte)(g >> 10);          rgbBuf[yp * 3 + 2] = (byte)(b >> 10);      }     }}

第二种：YUV422转RGB

int convert_yuv_to_rgb_pixel(int y, int u, int v){unsigned int pixel32 = 0;unsigned char *pixel = (unsigned char *)&pixel32;int r, g, b;r = y + (1.370705 * (v-128));g = y - (0.698001 * (v-128)) - (0.337633 * (u-128));b = y + (1.732446 * (u-128));if(r > 255) r = 255;if(g > 255) g = 255;if(b > 255) b = 255;if(r < 0) r = 0;if(g < 0) g = 0;if(b < 0) b = 0;pixel[0] = r ;pixel[1] = g ;pixel[2] = b ;return pixel32;}int convert_yuv_to_rgb_buffer(unsigned char *yuv, unsigned char *rgb, unsigned int width, unsigned int height){unsigned int in, out = 0;unsigned int pixel_16;unsigned char pixel_24[3];unsigned int pixel32;int y0, u, y1, v;for(in = 0; in < width * height * 2; in += 4){pixel_16 =yuv[in + 3] << 24 |yuv[in + 2] << 16 |yuv[in + 1] <<  8 |yuv[in + 0];y0 = (pixel_16 & 0x000000ff);u  = (pixel_16 & 0x0000ff00) >>  8;y1 = (pixel_16 & 0x00ff0000) >> 16;v  = (pixel_16 & 0xff000000) >> 24;pixel32 = convert_yuv_to_rgb_pixel(y0, u, v);pixel_24[0] = (pixel32 & 0x000000ff);pixel_24[1] = (pixel32 & 0x0000ff00) >> 8;pixel_24[2] = (pixel32 & 0x00ff0000) >> 16;rgb[out++] = pixel_24[0];rgb[out++] = pixel_24[1];rgb[out++] = pixel_24[2];pixel32 = convert_yuv_to_rgb_pixel(y1, u, v);pixel_24[0] = (pixel32 & 0x000000ff);pixel_24[1] = (pixel32 & 0x0000ff00) >> 8;pixel_24[2] = (pixel32 & 0x00ff0000) >> 16;rgb[out++] = pixel_24[0];rgb[out++] = pixel_24[1];rgb[out++] = pixel_24[2];}return 0;}

使用时，调用convert_yuv_to_rgb_buffer（）这个函数就可以了。关于这个函数的参数解释如下：
yuv：YUV422数据的起始地址

rgb：转换后的数据的起始地址

width：摄像头采集数据时所设置的图片宽度（如：320）

height：摄像头采集数据时所设置的图片高度（如：240）

参考：

1.  http://developer.android.com/reference/android/graphics/ImageFormat.html

2.  http://www.cnblogs.com/lknlfy/archive/2012/04/09/2439508.html

3.  http://www.ztyhome.com/android-camera-yuv420/

4.  http://blog.csdn.net/maopig/article/details/7669177

5.  http://blog.csdn.net/perfectpdl/article/details/7616932