how to press button continuously?

hello!

I want to take a screenshot of the video several times when I press the f key , And when I press the p button, the video stops.

But when I run the program:

it displays a large number of figures that result from separating all the video frames and displaying it as a figure, and each time the f key is pressed, All these figures are repeated again.Thanks for your help!

clc
clear all
close all
a = imaqhwinfo;
vid = videoinput('winvideo',1);
set(vid, 'FramesPerTrigger', Inf);
set(vid, 'ReturnedColorspace', 'rgb')
vid.FrameGrabInterval = 5;
start(vid) 
while(vid.FramesAcquired<=200)
    
    Key=get(gcf,'CurrentKey');
    if Key =='s'
        img1 = getsnapshot(vid);
        break;
    end
    data = getsnapshot(vid);
    diff_im = imsubtract(data(:,:,1), rgb2gray(data));
    diff_im = medfilt2(diff_im, [3 3]);
    diff_im = im2bw(diff_im,0.18);
    diff_im = bwareaopen(diff_im,300);
    bw = bwlabel(diff_im, 8);
    stats = regionprops(bw, 'BoundingBox', 'Centroid'); 
   imshow(data)
    hold on
     for object = 1:length(stats)
        bb = stats(object).BoundingBox;
        bc = stats(object).Centroid;
        rectangle('Position',bb,'EdgeColor','r','LineWidth',2)
        plot(bc(1),bc(2), '-m+')
        a=text(bc(1)+15,bc(2), strcat('X: ', num2str(round(bc(1))), '    Y: ', num2str(round(bc(2)))));
        set(a, 'FontName', 'Arial', 'FontWeight', 'bold', 'FontSize', 12, 'Color', 'yellow');
     
    end
    
    hold off
end

h=0;

while(vid.FramesAcquired<=800)
    
    Key1=get(gcf,'CurrentKey');
    if Key1 =='f'
        h=h+1;
        img2{h} = getsnapshot(vid);
    end
     if Key1 =='p'
        img3 = getsnapshot(vid);
        break;

     end
    
     data = getsnapshot(vid);
     diff_im = imsubtract(data(:,:,1), rgb2gray(data));
     diff_im = medfilt2(diff_im, [3 3]);
     diff_im = im2bw(diff_im,0.18);
    diff_im = bwareaopen(diff_im,300);
     bw = bwlabel(diff_im, 8);
    stats = regionprops(bw, 'BoundingBox', 'Centroid'); 
    imshow(data)
    hold on
    for object = 1:length(stats)
        bb = stats(object).BoundingBox;
        bc = stats(object).Centroid;
        rectangle('Position',bb,'EdgeColor','r','LineWidth',2)
        plot(bc(1),bc(2), '-m+')
        a=text(bc(1)+15,bc(2), strcat('X: ', num2str(round(bc(1))), '    Y: ', num2str(round(bc(2)))));
        set(a, 'FontName', 'Arial', 'FontWeight', 'bold', 'FontSize', 12, 'Color', 'yellow');
     
    end
    
    hold off
end

stop(vid);

ya=cell(h+2,1);
ya{1}=img1;
for o=2:h+1
    ya{o}=img2{o-1};
end
ya{h+2}=img3;

stats_f=cell(2,1);
stats_f=cell2mat(stats_f);

figure;
imshow(img1)
figure
imshow(img2)

Answer 1

[Mohammad Sami]

If you want to update the figure rather then create new figures, you need to explicitly update the CData property of existing imshow. A minimum example is as follows.

    if true
height = 1080;
width = 1920;
% create new figure
figure;
Display1 = imshow(zeros(height,width,3,'uint8'));
Frame = getsnapshot(vid);
Display1.CData = Frame;
    end

[a.s]

Thank you , but I want to push the key s for just once( that works properly until this part).

then by pressing the F key for example 5 times..5 screenshots of the video at the moment of pressing the key and then stop the video by pressing the p key.

And finally show me 6 images that were the result of pressing the keys of s and f.

-------------------------------------------------------------------------------------------------------------------------------------------------

Error in images.internal.imageDisplayValidateParams (line 11)

validateattributes(common_args.CData, {'numeric','logical'},...

Error in images.internal.imageDisplayParseInputs (line 78)

common_args = images.internal.imageDisplayValidateParams(common_args);

Error in imshow (line 245)

images.internal.imageDisplayParseInputs({'Parent','Border','Reduce'},preparsed_varargin{:});

Error in m22 (line 91)

imshow(img2)