OpenCv 016---图像ROI与ROI操作
1 前备知识
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2 所用到的主要OpenCv API
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3 程序代码
#include<opencv2/opencv.hpp> #include<iostream> using namespace cv; using namespace std; int main(int argc, char** argv) { Mat src = imread("G:\\CVworkstudy\\program_wwx\\Research society140\\ZhaiZhigang140\\colormap.png"); namedWindow("input", WINDOW_AUTOSIZE); imshow("input", src); int h = src.rows; int w = src.cols; //get ROI int cy = h / 2; int cx = w / 2; Rect rect(cx - 100, cy - 100, 200, 200); Mat roi = src(rect); imshow("roi", roi); Mat image = roi.clone(); // modify ROI roi.setTo(Scalar(255, 0, 0)); imshow("result", src); //modif copy roi image.setTo(Scalar(255, 0, 0)); imshow("result", src); imshow("copy roi", image); //example with ROI - generate mask Mat src2 = imread("G:\\CVworkstudy\\program_wwx\\Research society140\\ZhaiZhigang140\\zhengjianzhao.jpg"); imshow("src2", src2); Mat hsv, mask; cvtColor(src2, hsv, COLOR_BGR2HSV); //That is, dst (I) is set to 255 (all 1 -bits) if src (I) is within the //specified 1D, 2D, 3D, ... box and 0 otherwise. inRange(hsv, Scalar(100, 43, 46), Scalar(124, 255, 255), mask);//within the wise set to 255,if not,set 0 imshow("mask", mask);//get the mask exclusive person //extract person ROI Mat person; bitwise_not(mask, mask); Mat kernel = getStructuringElement(MORPH_RECT, Size(3, 3)); morphologyEx(mask, mask, MORPH_CLOSE, kernel); bitwise_and(src2, src2, person, mask); imshow("person", person); //generate background Mat result = Mat::zeros(src2.size(), src2.type()); result.setTo(Scalar(0, 0, 255)); //combine background + person Mat dst; bitwise_not(mask, mask); bitwise_or(person, result, dst, mask); add(dst, person, dst); imshow("dst", dst); waitKey(0); return 0; }
4 运行结果
后面几张图省略,主要是实现证件照背景颜色替换,由蓝色替换为红色,颜色HSV范围表参见:
OpenCv 009---色彩空间与色彩空间转换
5 扩展及注意事项
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One day,I will say
"I did it"