利用Mask将不规则区域保存下来 算法实现

利用Mask将不规则区域保存下来

Point2f pt1, pt2, pt3, pt4;
	pt1.x = 17;
	pt1.y = 75;
	pt2.x = 374;
	pt2.y = 48;
	pt3.x = 44;
	pt3.y = 249;
	pt4.x = 394;
	pt4.y = 234;

	line(img, pt1, pt2, Scalar(0,0,255),1);
	line(img, pt1, pt3, Scalar(0,0,255),1);
	line(img, pt2, pt4, Scalar(0,0,255),1);
	line(img, pt3, pt4, Scalar(0,0,255),1);

	Point2i pts[4] = {Point2i(17,75),Point2i(374,48),Point2i(394,234),Point2i(44,249)};

	Mat result(img.size(),CV_8UC1,Scalar(0));
	fillConvexPoly(result,pts,4,Scalar(255,255,255));

	Mat mask;
	img.copyTo(mask,result);
	imshow("mask",mask);

效果为：

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