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Convert NV12 to RGB

        Mat yuv(720,1280, CV_8UC3);//I am reading NV12 format from a camera
         Mat rgb;

        cvtColor(yuv,rgb,CV_YUV2RGB_NV12);
       The resolution of rgb after conversion is 480X720

        cvtColor(yuv,rgb,CV_YCrCb2RGB);
       The resolution of rgb after conversion is 720X1280

However, using the above conversion I am not able to display a proper view of the images