Python OpenCV在其他应用程序之上打开窗口

Question

When executing an OpenCV python script containing: cv2.imshow(img) the resulting window opens behind my terminal window. This is a mild irritation - is there any way to get it to initially open in front / on top?

A number of people have asked questions ( here and here ) about forcing persistent behaviour but this is, I think, simpler.

Platform OS X and OpenCV 2.4.11

Answer 1

One way to work around this would be to set all windows from OpenCV "frontmost" using AppleScript.

subprocess.call(["/usr/bin/osascript", "-e", 'tell app "Finder" to set frontmost of process "Python" to true'])

This way, all windows should be brought to the front.

Answer 2

Open a namedWindow before imshow , for instance:

cv2.namedWindow('ImageWindowName', cv2.WINDOW_NORMAL)
cv2.imshow('ImageWindowName',img)
cv2.waitKey(0)
cv2.destroyAllWindows()

Comment if this makes any different.

Answer 3

I can do what I think you want by adding a single line to the following file in the OpenCV distribution:

modules/highgui/src/window_cocoa.mm

It is around line 568, and is the single line after the word SETCHELL in the code below:

    [window setFrameTopLeftPoint:initContentRect.origin];

    [window setFirstContent:YES];

    [window setContentView:[[CVView alloc] init]];

    [window setHasShadow:YES];
    [window setAcceptsMouseMovedEvents:YES];
    [window useOptimizedDrawing:YES];
    [window setTitle:windowName];
    [window makeKeyAndOrderFront:nil];

// SETCHELL - raise window to top of stacking order
[window setLevel:CGWindowLevelForKey(kCGMaximumWindowLevelKey)];

    [window setAutosize:(flags == CV_WINDOW_AUTOSIZE)];

    [windows setValue:window forKey:windowName];

    [localpool drain];
    return [windows count]-1;
}

CV_IMPL int cvWaitKey (int maxWait)
{