分离RGB24像素数据中的R、G、B分量
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README.md
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README.md
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@ -140,5 +140,40 @@ yuv420_split.cpp 程序中的函数可以将YUV420P数据中的Y、U、V三个
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## 分离RGB24像素数据中的R、G、B分量
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> 说明:与YUV420P三个分量分开存储不同,RGB24格式的每个像素的三个分量是连续存储的。一帧宽高分别为w、h的RGB24图像一共占用w * h * 3 Byte的存储空间。RGB24格式规定首先存储第一个像素的R、G、B,然后存储第二个像素的R、G、B…以此类推。类似于YUV420P的存储方式称为Planar方式,而类似于RGB24的存储方式称为Packed方式。
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调用方法:
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> ./rgb24_split ./mediadata/cie1931_500x500.rgb 500 500
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上述代码运行后,将会把一张分辨率为500x500的名称为cie1931_500x500.rgb的RGB24格式的像素数据文件分离成为三个文件:
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- output_r.y:R数据,分辨率为**500x500**。
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- output_g.y:G数据,分辨率为**500x500**。
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- output_b.y:B数据,分辨率为**500x500**。
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输入的原图是一张标准的CIE 1931色度图。该色度图右下为红色,上方为绿色,左下为蓝色,如下图所示:
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![](./images/cie1931_500x500.png)
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R数据图像如图所示: ![](./images/cie1931_500x500_r.png)
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G数据图像如图所示: ![](./images/cie1931_500x500_g.png)
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B数据图像如图所示: ![](./images/cie1931_500x500_b.png)
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<br />
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<br />
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参考:[视音频数据处理入门:RGB、YUV像素数据处理](http://blog.csdn.net/leixiaohua1020/article/details/50534150)
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![](./images/leixiaohua_avDataProcess.png)
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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typedef int BOOL;
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#define TRUE 1
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#define FALSE 0
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BOOL rgb24_split(const char *file, int width, int height)
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{
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if (file == NULL) {
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return FALSE;
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}
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FILE *fp = fopen(file, "rb+");
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FILE *fp_r = fopen("./out/output_rgb24_r.y", "wb+");
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FILE *fp_g = fopen("./out/output_rgb24_g.y", "wb+");
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FILE *fp_b = fopen("./out/output_rgb24_b.y", "wb+");
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unsigned char *data = (unsigned char *)malloc(width*height*3);
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memset(data, 0, width*height*3);
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fread(data, 1, width*height*3, fp);
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for(int i=0; i<width*height*3; i=i+3) {
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fwrite(data+i+0, 1, 1, fp_r);
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fwrite(data+i+1, 1, 1, fp_g);
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fwrite(data+i+2, 1, 1, fp_b);
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}
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free(data);
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fclose(fp);
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fclose(fp_r);
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fclose(fp_g);
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fclose(fp_b);
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return TRUE;
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}
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int main(int argc, char *argv[])
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{
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if (argc == 4) {
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rgb24_split(argv[1], atoi(argv[2]), atoi(argv[3]));
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}
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return 0;
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}
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