capture frame on click

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SOE CADLAB
SOE CADLAB 2019-9-30
评论： SOE CADLAB 2019-10-20
how can i capture a frame on mouse click from a video ?
  1 个评论
darova
darova 2019-9-30
I think buttonDownFcn should be used in this case. BUt can't figure out how =(

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回答（1 个）

Abhilash Padma
Abhilash Padma 2019-10-3
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
  2 个评论
darova
darova 2019-10-3
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
SOE CADLAB 2019-10-20
thank you but i need to capture that paritular frame on a mouse click

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