python代码：
import cv2 as cv
import numpy as npsrc = cv.imread("./test.png")
cv.namedWindow("input", cv.WINDOW_AUTOSIZE)
cv.imshow("input", src)
h, w = src.shape[:2]# 获取ROI
cy = h//2
cx = w//2
roi = src[cy-100:cy+100,cx-100:cx+100,:]
cv.imshow("roi", roi)# copy ROI
image = np.copy(roi)# modify ROI
roi[:, :, 0] = 0
cv.imshow("result", src)# modify copy roi
image[:, :, 2] = 0
cv.imshow("result", src)
cv.imshow("copy roi", image)# example with ROI - generate mask
src2 = cv.imread("./test.png")
cv.imshow("src2", src2)
hsv = cv.cvtColor(src2, cv.COLOR_BGR2HSV)
mask = cv.inRange(hsv, (35, 43, 46), (99, 255, 255))# extract person ROI
mask = cv.bitwise_not(mask)
person = cv.bitwise_and(src2, src2, mask=mask)# generate background
result = np.zeros(src2.shape, src2.dtype)
result[:,:,0] = 255# combine background + person
mask = cv.bitwise_not(mask)
dst = cv.bitwise_or(person, result, mask=mask)
dst = cv.add(dst, person)cv.imshow("dst", dst)cv.waitKey(0)
cv.destroyAllWindows()
C++代码：
#include<opencv2/opencv.hpp>
#include<iostream>using namespace cv;
using namespace std;int main(int argc, char** argv) {Mat src = imread("./test.png");namedWindow("input", WINDOW_AUTOSIZE);imshow("input", src);int h = src.rows;int w = src.cols;// ��ȡROIint 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 ROIroi.setTo(Scalar(255, 0, 0));imshow("result", src);// modify copy roiimage.setTo(Scalar(0, 0, 255));imshow("result", src);imshow("copy roi", image);// example with ROI - generate maskMat src2 = imread("./test.png");imshow("src2", src2);Mat hsv, mask;cvtColor(src2, hsv, COLOR_BGR2HSV);inRange(hsv, Scalar(35, 43, 46), Scalar(99, 255, 255), mask);imshow("mask", mask);// extract person ROIMat person;bitwise_not(mask, mask);bitwise_and(src2, src2, person, mask);imshow("person", person);// generate backgroundMat result = Mat::zeros(src2.size(), src2.type());result.setTo(Scalar(255, 0, 0));// combine background + personMat dst;bitwise_not(mask, mask);bitwise_or(person, result, dst, mask);add(dst, person, dst);imshow("dst", dst);waitKey(0);return 0;
}
OpenCV学习笔记代码，欢迎follow：
MachineLP/OpenCV-github.com
