func of YUV420SP to ARGB

最新推荐文章于 2024-07-24 22:55:56 发布

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最新推荐文章于 2024-07-24 22:55:56 发布

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原文链接：https://my.oschina.net/aspirs/blog/610532

本文提供了一个用于将YUV420SP格式图像转换为ARGB格式的C函数实现。该函数适用于Android平台上的OpenCV应用，帮助开发者处理图像颜色空间的转换。

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为什么80%的码农都做不了架构师？>>>

below contents from link: http://stackoverflow.com/questions/3571568/android-yuv420sp-to-argb-in-opencv

I use this function I found on net to do the converstion between YUV420SP to ARGB. Thanks for your help.

void decodeYUV420SP(int* rgb, char* yuv420sp, int width, int height) {
    int frameSize = width * height;

    for (int j = 0, yp = 0; j < height; j++) {
        int uvp = frameSize + (j >> 1) * width, u = 0, v = 0;
        for (int i = 0; i < width; i++, yp++) {
            int 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;
            }

            int y1192 = 1192 * y;
            int r = (y1192 + 1634 * v);
            int g = (y1192 - 833 * v - 400 * u);
            int 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;

            rgb[yp] = 0xff000000 | ((r << 6) & 0xff0000) | ((g >> 2) & 0xff00) | ((b >> 10) & 0xff);
        }
    }
}