how to get pixel coordinates in implay

Hello,

Is there a way to get the mouse onclick x,y pixel coordinates when playing a movie in implay.

Answer 1

[Jayanti]

Hi Juergen,

The“implay”function in MATLAB does not provide direct access to pixel coordinates on click event.

Alternatively you can try achieving this through custom implementation by using “VideoReader”to read video frames and displaying them in a MATLAB figure where you can capture mouse events.

Please refer to the below code:

videoReader = VideoReader('file.mp4');
hFig = figure;
while hasFrame(videoReader)
    frame = readFrame(videoReader);
    imshow(frame, 'Parent', gca);
    [x, y, button] = ginput(1);
    if ~isempty(button)
        fprintf('Clicked at X: %f, Y: %f\n', x, y);
    end
    pause(1/videoReader.FrameRate);
end

The video will be paused at each frame, where “ginput” function captures the x and y coordinates of a mouse click, which will be printed to the command window.

Please refer to the documentation link on “ginput” for your reference:

https://in.mathworks.com/help/matlab/ref/ginput.html

Hope this will be useful!

[Juergen]

Hi Jayanti, thanks a lot.

Is there a way so that the movie runs and is only stopped if there is a mouse click on the image?

[Jayanti]

Hi Juergen,

In the above implementation, we extract each frame individually instead of playing the video. This allows us to capture mouse events. If you don't want to click on a frame, you can press the "Return" key. This will proceed to the next frame.