OpenCV靜心修煉總結篇7——繪製形狀與文字
阿新 • • 發佈：2018-12-22
繪製直線
參考程式碼：
/* 畫線 */
Point p1 = (20, 30);
Point p2;
p2.x = 300;
p2.y = 300;
Scalar color = Scalar(0, 0, 255);
line(src, p1, p2, color, 3, LINE_8);繪製矩形
參考程式碼：
/* 畫矩形 */
Rect rect = Rect(200, 100, 300, 300);
Scalar color = Scalar(255, 0, 0);
rectangle(src, rect, color, 2, LINE_8);繪製橢圓
參考程式碼：
/* 繪製橢圓 */
Scalar color = Scalar(0, 255, 0);
ellipse(src, Point(src.cols / 2, src.rows / 2), Size(src.cols / 4, src.rows / 4), 90,0, 360, color, 2, LINE_4);繪製圓
參考程式碼：
/* 繪製圓 */ Scalar color = Scalar(255, 0, 255); Point center = Point(src.cols / 2, src.rows / 2); circle(src, center, 150, color, 1, 8);
繪製文字
參考程式碼：
Mat src;
src = imread("E:/1.png"); putText(src,"hellowopenCV",Point(10,100),CV_FONT_HERSHEY_COMPLEX,1.0,Scalar(12,23,200),3,8);
imshow("output image",src);
waitKey(0);繪製隨機直線
參考程式碼：
Mat src; src = imread("E:/1.png"); RNG rng(12345); Point p1; Point p2; Mat bg = Mat::zeros(src.size(), src.type()); while (1) { for (int i = 0; i < 10000; i++) { p1.x = rng.uniform(0, src.cols); p1.y = rng.uniform(0, src.rows); p2.x = rng.uniform(0, src.cols); p2.y = rng.uniform(0, src.rows); Scalar color = Scalar(rng.uniform(0, 255), rng.uniform(0, 255), rng.uniform(0, 255)); line(bg, p1, p2, color, 1, 8); imshow("input", bg); if (waitKey(50) > 0) { break; } } }
效果圖：
