C# yuv数据转 RGB bmp文件保存 

  1 namespace GraphicsConsoleApplication
  2 {
  3     class Program
  4     {
  5         static double[,] YUV2RGB_CONVERT_MATRIX = new double[3, 3] { { 1, 0, 1.4022 }, { 1, -0.3456, -0.7145 }, { 1, 1.771, 0 } };
  6 
  7         static void Main(string[] args)
  8         {
  9             int width = 352;
 10             int height = 288;
 11             int imgSize = width * height;
 12             int frameSize = imgSize + (imgSize >> 1);
 13 
 14             byte[] yuv = new byte[frameSize];
 15             byte[] rgb = new byte[3 * imgSize];
 16 
 17             using (FileStream fs = File.OpenRead("E:\\cer\\tempete.cif"))
 18             {
 19                 int frame = (int)fs.Length / frameSize;
 20                 using (BinaryReader br = new BinaryReader(fs))
 21                 {
 22                     int index = 0;
 23                     while (br.PeekChar() != -1)
 24                     {
 25                         // 循环读取每一桢
 26                         br.Read(yuv, 0, frameSize);
 27 
 28                         // 转换为 RGB
 29                         ConvertYUV2RGB(yuv, rgb, width, height);
 30 
 31                         // 写 BMP 文件。
 32                         WriteBMP(rgb, width, height, string.Format("E:\\cer\\YUV2BMP\\yuv2bmp_{0}.bmp", index++)); 
 33                     }
 34                 }
 35             }
 36         }
 37 
 38         /// <summary>
 39         /// 将转换后的 RGB 图像数据按照 BMP 格式写入文件。
 40         /// </summary>
 41         /// <param name="rgbFrame">RGB 格式图像数据。</param>
 42         /// <param name="width">图像宽（单位：像素）。</param>
 43         /// <param name="height">图像高（单位：像素）。</param>
 44         /// <param name="bmpFile"> BMP 文件名。</param>
 45         static void WriteBMP(byte[] rgbFrame, int width, int height, string bmpFile)
 46         {
 47             // 写 BMP 图像文件。
 48             int yu = width * 3 % 4;
 49             int bytePerLine = 0;
 50             yu = yu != 0 ? 4 - yu : yu;
 51             bytePerLine = width * 3 + yu;
 52 
 53             using (FileStream fs = File.Open(bmpFile, FileMode.Create))
 54             {
 55                 using (BinaryWriter bw = new BinaryWriter(fs))
 56                 {
 57                     bw.Write('B');
 58                     bw.Write('M');
 59                     bw.Write(bytePerLine * height + 54);
 60                     bw.Write(0);
 61                     bw.Write(54);
 62                     bw.Write(40);
 63                     bw.Write(width);
 64                     bw.Write(height);
 65                     bw.Write((ushort)1);
 66                     bw.Write((ushort)24);
 67                     bw.Write(0);
 68                     bw.Write(bytePerLine * height);
 69                     bw.Write(0);
 70                     bw.Write(0);
 71                     bw.Write(0);
 72                     bw.Write(0);
 73 
 74                     byte[] data = new byte[bytePerLine * height];
 75                     int gIndex = width * height;
 76                     int bIndex = gIndex * 2;
 77 
 78                     for (int y = height - 1, j = 0; y >= 0; y--, j++)
 79                     {
 80                         for (int x = 0, i = 0; x < width; x++)
 81                         {
 82                             data[y * bytePerLine + i++] = rgbFrame[bIndex + j * width + x];    // B
 83                             data[y * bytePerLine + i++] = rgbFrame[gIndex + j * width + x];    // G
 84                             data[y * bytePerLine + i++] = rgbFrame[j * width + x];  // R
 85                         }
 86                     }
 87 
 88                     bw.Write(data, 0, data.Length);
 89                     bw.Flush();
 90                 }
 91             }
 92         }
 93 
 94         /// <summary>
 95         /// 将一桢 YUV 格式的图像转换为一桢 RGB 格式图像。
 96         /// </summary>
 97         /// <param name="yuvFrame">YUV 格式图像数据。</param>
 98         /// <param name="rgbFrame">RGB 格式图像数据。</param>
 99         /// <param name="width">图像宽（单位：像素）。</param>
100         /// <param name="height">图像高（单位：像素）。</param>
101         static void ConvertYUV2RGB(byte[] yuvFrame, byte[] rgbFrame, int width, int height)
102         {
103             int uIndex = width * height;
104             int vIndex = uIndex + ((width * height) >> 2);
105             int gIndex = width * height;
106             int bIndex = gIndex * 2;
107 
108             int temp = 0;
109 
110             for (int y = 0; y < height; y++)
111             {
112                 for (int x = 0; x < width; x++)
113                 {
114                     // R分量
115                     temp = (int)(yuvFrame[y * width + x] + (yuvFrame[vIndex + (y / 2) * (width / 2) + x / 2] - 128) * YUV2RGB_CONVERT_MATRIX[0, 2]);
116                     rgbFrame[y * width + x] = (byte)(temp < 0 ? 0 : (temp > 255 ? 255 : temp));
117 
118                     // G分量
119                     temp = (int)(yuvFrame[y * width + x] + (yuvFrame[uIndex + (y / 2) * (width / 2) + x / 2] - 128) * YUV2RGB_CONVERT_MATRIX[1, 1] + (yuvFrame[vIndex + (y / 2) * (width / 2) + x / 2] - 128) * YUV2RGB_CONVERT_MATRIX[1, 2]);
120                     rgbFrame[gIndex + y * width + x] = (byte)(temp < 0 ? 0 : (temp > 255 ? 255 : temp));
121 
122                     // B分量
123                     temp = (int)(yuvFrame[y * width + x] + (yuvFrame[uIndex + (y / 2) * (width / 2) + x / 2] - 128) * YUV2RGB_CONVERT_MATRIX[2, 1]);
124                     rgbFrame[bIndex + y * width + x] = (byte)(temp < 0 ? 0 : (temp > 255 ? 255 : temp));
125                 }
126             }
127         }
128     }
129 }

这里有个C++嵌汇编的代码:

http://blog.lmtw.com/b/guanyhu/archives/2006/38878.html

 

这里有个C++的代码:

http://blog.csdn.net/zsJum/archive/2007/11/18/1891155.aspx

你可以把这两个编译成dll,然后在C#中通过P/Invoke调用.

 

要不,你也可以把它改成C#版本的.第二个改起来容易.

 

根据此论坛[http://topic.csdn.net/u/20071017/12/6de49307-07e5-42fe-9e7e-047ab918cae6.html]的回答,我修改了C#版本,使用其提供的文件[http://trace.eas.asu.edu/yuv/tempete.zip]可以正常转换,已测试通过.

 

 

来源：转载

posted @ 2014-07-23 09:15  peidongbin  阅读(2842)  评论(0)    收藏  举报