Android的Yuv420sp到ARGB OpenCV中 [英] Android Yuv420sp to ARGB in OpenCV

问题描述

我试图从previewcallback从手机发送原始图像到电脑。然后，PC将处理图像。我使用OpenCV库做的图像处理。
此刻，我只是写在previewcallback函数的字节数组保存到一个文件，
并将该文件复制到电脑上，我写了一个简单的程序，文件中第一次读，并保存到memeory，然后直接将数据复制到IplImage.imageData。但是，我总是得到一个垃圾的形象。

我用这个功能我净发现这样做YUV420SP之间的converstion到ARGB。
感谢您的帮助。

 无效德codeYUV420SP为（int * RGB，字符* yuv420sp，诠释的宽度，高度INT）{
    INT框架尺寸=宽*高;    对于（INT J = 0，YP = 0; J＆LT;高度; J ++）{
        INT UVP =框架尺寸+（J＆GT;→1）*宽度，U = 0，V = 0;
        的for（int i = 0; I＆LT;宽度;我++，YP ++）{
            INT Y =（0xFF的及（（int）的yuv420sp [YP]）） -  16;
            如果（γ℃的）Y = 0;
            如果（（I和1）== 0）{
                V =（0xFF的＆安培; yuv420sp [UVP ++]） -  128;
                U =（0xFF的＆安培; yuv420sp [UVP ++]） -  128;
            }            INT y1192 = 1192 * Y;
            INT R =（y1192 + 1634 * V）;
            INT G =（y1192  -  833 * V  -  400 * U）;
            INT B =（y1192 + 2066 * U）;            如果（为r 0）R = 0;否则如果（R＆GT; 262143）R = 262143;
            如果（克小于0）G = 0;否则如果（g取代; 262143）G = 262143;
            如果（二℃，）B = 0;否则如果（B个262143）B = 262143;            RGB [YP] = 0xff000000 | （（为r 6;）及为0xFF0000）| （（g取代;→2）及为0xFF00）| （（B个大于10）及0xff的）;
        }
    }
}
 

解决方案

您可以使用OpenCV4Android转换器：

  Imgproc.cvtColor（mYuv，mRgba，Imgproc.COLOR_YUV420sp2RGBA）;
 

I am trying to send a raw image from the previewcallback from the phone to PC. The PC will then process the image. I am use OpenCV library to do the image processing. At the moment i just write a function in previewcallback to save the byte array to a file, and copy the file to pc and I wrote a simple program to first read in the file and save it into memeory and then directly copy the data to the IplImage.imageData. But I always get a garbage image.

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);
        }
    }
}

解决方案

You can use OpenCV4Android converters:

Imgproc.cvtColor(mYuv, mRgba, Imgproc.COLOR_YUV420sp2RGBA);

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