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fanfuhan OpenCV 教學003 ~ opencv-003-圖像對象（Mat）創建與賦值 資料來源: https://fanfuhan.github.io/ https://fanfuhan.github.io/2019/03/21/opencv-003/ GITHUB:https://github.com/jash-git/fanfuhan_ML_OpenCV C++ #include #include using namespace std; using namespace cv; int main(){ Mat src = imread("../images/liuyifei_1.png"); // 通过克隆或复制创建图像对象，m1和src指向不同内存块 Mat m1 = src.clone(); Mat m2; src.copyTo(m2); // 赋值法，m3和src指向同一内存块 Mat m3 = src; // 创建空白图像 Mat m4 = Mat::zeros(src.size(),src.type()); Mat m5 = Mat::zeros(Size(512,512),CV_8UC3); Mat m6 = Mat::ones(Size(512,512),CV_8UC3); // kernel: [0, -1, 0 // -1, 5, -1 // 0, -1, 0] Mat kernel = (Mat_(3,3)<<0,-1,0,-1,5,-1,0,-1,0); waitKey(0); return 0; } Python import cv2 as cv import numpy as np src = cv.imread("../images/liuyifei_1.png") cv.namedWindow("input", cv.WINDOW_AUTOSIZE) cv.imshow("input", src) # 克隆图像 m1 = np.copy(src) # 赋值 m2 = src src[100:200,200:300,:] = 255 # 第三维代表图像通道 cv.imshow("m2",m2) m3 = np.zeros(src.shape, src.dtype) cv.imshow("m3", m3) m4 = np.zeros([512,512], np.uint8) # m4[:,:] =127 try to give gray value 127 cv.imshow("m4", m4) m5 = np.ones(shape=[512,512,3], dtype=np.uint8) m5[:,:,0] = 255 cv.imshow("m5", m5) cv.waitKey(0) cv.destroyAllWindows()