void Start()
{
srcMat = Imgcodecs.imread(Application.dataPath + "/Textures/lena.jpg", 1); //512,512
Imgproc.cvtColor(srcMat, srcMat, Imgproc.COLOR_BGR2RGB);
logoMat = Imgcodecs.imread(Application.dataPath + "/Textures/head.png", 1);
Imgproc.cvtColor(logoMat, logoMat, Imgproc.COLOR_BGR2RGB);
Mat ROI = srcMat.submat(new Rect(20, 20, logoMat.cols(), logoMat.rows()));
logoMat.copyTo(ROI);//logo复制到ROI上面
Texture2D t2d = new Texture2D(srcMat.width(), srcMat.height());
Utils.matToTexture2D(srcMat, t2d);
Sprite sp = Sprite.Create(t2d, new UnityEngine.Rect(0, 0, t2d.width, t2d.height), Vector2.zero);
m_srcImage.sprite = sp;
m_srcImage.preserveAspect = true;
m_srcImage.rectTransform.offsetMin = new Vector2(0, 0);
m_srcImage.rectTransform.offsetMax = new Vector2(t2d.width, t2d.height);
m_srcImage.rectTransform.anchoredPosition = Vector2.zero;
}