capture frame on click

how can i capture a frame on mouse click from a video ?

[darova]

I think buttonDownFcn should be used in this case. BUt can't figure out how =(

Answer 1

[Abhilash Padma]

One of the ways to achieve this task is to play video on axes and use buttonDownFcn of image object. You can try this by typing the following command in your MATLAB prompt which will open an example explaining how to display a video in a custom user interface.

openExample('vision/VideoInCustomGUIExample');

Add the following line in the “displayImage” function of showFrameOnAxis.m

hIm.ButtonDownFcn=@(~,~)imwrite(frame,'a.jpg');

Refer the following link for more information: https://in.mathworks.com/help/vision/examples/video-display-in-a-custom-user-interface.html

[darova]

I made simple example for gif animation, but can't set up function for buttonDownFcn

Can you please look?

clc,clear

x = linspace(0,4);
y = sin(x);
plot(x,y);

f = getframe; 
filename = 'gif_animation.gif';
[im,map] = rgb2ind(f.cdata,256);
imwrite(im,map,filename,'DelayTime',0,'Loopcount',inf);
fcn = @(~,~,im,map)imwrite(im,map,filename,'DelayTime',0.1,'WriteMode','Append');
hold on
for i = 1:length(x)
    h = plot(x(i),y(i),'or');
    f = getframe(gca); 
    [im,map] = rgb2ind(f.cdata,256);
    set(gca,'buttonDOwnFcn',@(~,~,im,map)fcn(im,map))
    pause(0.1)
    delete(h)
end
hold off

[SOE CADLAB]

thank you but i need to capture that paritular frame on a mouse click