Opencv——全屏显示图片

最新推荐文章于 2023-10-27 18:54:11 发布

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本文介绍如何使用OpenCV库实现窗口全屏显示图片的功能。通过具体的C++代码示例，展示了创建窗口、设置窗口属性为全屏以及展示图片的过程。

原型 C++: void setWindowProperty(const string& winname, int prop_id, double prop_value)

Parameters:	name – Name of the window. prop_id – Window property to edit. The following operation flags are available: CV_WND_PROP_FULLSCREEN Change if the window is fullscreen ( `CV_WINDOW_NORMAL` or `CV_WINDOW_FULLSCREEN` ). CV_WND_PROP_AUTOSIZE Change if the window is resizable (`CV_WINDOW_NORMAL` or `CV_WINDOW_AUTOSIZE` ). CV_WND_PROP_ASPECTRATIO Change if the aspect ratio of the image is preserved ( `CV_WINDOW_FREERATIO` or `CV_WINDOW_KEEPRATIO` ). prop_value – New value of the window property. The following operation flags are available: CV_WINDOW_NORMAL Change the window to normal size or make the window resizable. CV_WINDOW_AUTOSIZE Constrain the size by the displayed image. The window is not resizable. CV_WINDOW_FULLSCREEN Change the window to fullscreen. CV_WINDOW_FREERATIO Make the window resizable without any ratio constraints. CV_WINDOW_KEEPRATIO Make the window resizable, but preserve the proportions of the displayed image.

Parameters:

name – Name of the window.
prop_id –
Window property to edit. The following operation flags are available:
- CV_WND_PROP_FULLSCREEN Change if the window is fullscreen ( CV_WINDOW_NORMAL or CV_WINDOW_FULLSCREEN ).
- CV_WND_PROP_AUTOSIZE Change if the window is resizable (CV_WINDOW_NORMAL or CV_WINDOW_AUTOSIZE ).
- CV_WND_PROP_ASPECTRATIO Change if the aspect ratio of the image is preserved ( CV_WINDOW_FREERATIO or CV_WINDOW_KEEPRATIO ).
prop_value –
New value of the window property. The following operation flags are available:
- CV_WINDOW_NORMAL Change the window to normal size or make the window resizable.
- CV_WINDOW_AUTOSIZE Constrain the size by the displayed image. The window is not resizable.
- CV_WINDOW_FULLSCREEN Change the window to fullscreen.
- CV_WINDOW_FREERATIO Make the window resizable without any ratio constraints.
- CV_WINDOW_KEEPRATIO Make the window resizable, but preserve the proportions of the displayed image.

因此调用全屏，仅仅需要，且不用重新cmake

namedWindow("FullScreen",CV_WINDOW_NORMAL);
setWindowProperty("FullScreen", CV_WND_PROP_FULLSCREEN, CV_WINDOW_FULLSCREEN );

/*********************************************
*opencv可以设置全屏显示图片，具体代码如下
**********************************************/

#include <opencv2/highgui/highgui.hpp>
#include <iostream>

using namespace std;
using namespace cv;

int main()
{
	Mat srcImage = imread("pic.jpg",2|4);
	if (srcImage.empty())
	{
		cout << "srcImage load error\n" << endl;
		system("pause");
		exit(-1);
	}
	namedWindow("srcImage",CV_WINDOW_NORMAL);
	setWindowProperty("srcImage", CV_WND_PROP_FULLSCREEN, CV_WINDOW_FULLSCREEN);
	imshow("srcImage",srcImage);
	waitKey(0);
}