如何显示窗口大小不同的输出图像?通过使用cv :: Mat [英] How can I Display output image with difference size of window? by using cv::Mat

问题描述

根据如何显示输出窗口大小不同的图片?

我想使用OpenCV功能在窗口上显示图像.但是，无论何时我尝试显示图像都将适合显示的大小.

I would like to display an image on window using OpenCV function. However, anytime that I tried to display image will be fit to the size of display.

如果我要显示窗口大小不同的图像(例如，窗口大小1280x960px，图像在偏移坐标100x100px处为600x600px)，我该如何制作它们?

If I would like to display an image with difference size of window (for example. window size 1280x960px, and an image is 600x600px at offset coordinate 100x100px) How can I make them?

但是，根据上一个问题，我想使用cv :: Mat(C ++ API)我如何创建它们?

However, according to previous question I would like to use cv::Mat (C++ API) How cam I create them?

谢谢您的帮助.

推荐答案

cv::Mat smallImage = cv::imread("myimage.jpg");
cv::Mat bigWindow = cv::Mat::zeros(960,1280, smallImage.type());

cv::Rect r(0,0,smallImage.cols, smallImage.rows);
cv::Mat roi = bigWindow(r);
smallImage.copyTo(roi);
cv::namedWindow("Display"); // cv::namedWindow("Display", 0); if you want to be able to  resize window
cv::imshow("Display", bigWindow);
cv::waitKey(0);

您在上一个问题中有答案.现在，如果您想进一步了解OpenCV，则必须阅读文档！

You had your answer in your previous question. Now if you want to get further with OpenCV, you have to read the Documentation!

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