capturing the same frame

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Osita Onyejekwe
Osita Onyejekwe 2017-4-7
评论： Osita Onyejekwe 2017-4-10
My frame is capturing the same beginning video frame in multiple figures. I want the multiple figure to be images of the video as it progrosses, not the same figure for multiple figures. Here is my code. Please fix it
obj = VideoReader('Climate.mp4');
for k = 1 : 5 %fill in the appropriate number
this_frame = read(obj, k);
thisfig = figure();
%thisfig = gcf;
thisax = axes('Parent', thisfig);
image(this_frame, 'Parent', thisax);
title(thisax, sprintf('Frame #%d', k));
end

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Image Analyst
Image Analyst 2017-4-7
So don't create a new figure each frame. How does this work:
obj = VideoReader('Climate.mp4');
for k = 1 : obj.NumberOfFrames
this_frame = read(obj, k);
imshow(this_frame);
title(sprintf('Frame #%d', k), 'FontSize', 14);
drawnow; % Force immediate repaint of screen.
pause(0.1); % Increase number to slow it down more.
end
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Osita Onyejekwe
Osita Onyejekwe 2017-4-7
obj = VideoReader('Climate.mp4'); for k = 1 : obj.NumberOfFrames this_frame = read(obj, k); imshow(this_frame); title(sprintf('Frame #%d', k), 'FontSize', 14); drawnow; % Force immediate repaint of screen. pause(0.1); % Increase number to slow it down more. promptMessage = sprintf('Showing Frame #%d.\nDo you want to Continue processing,\nor Quit processing?', k); titleBarCaption = 'Continue?'; buttonText = questdlg(promptMessage, titleBarCaption, 'Continue', 'Quit', 'Continue'); if strcmpi(buttonText, 'Quit') break; if rem(k, 5) == 0 % Ask every fifth frame buttonText = questdlg(promptMessage, titleBarCaption, 'Continue', 'Quit', 'Continue'); end end end
i put the if in but now it underlines everything...
Image Analyst
Image Analyst 2017-4-7
You need to think about the logic flow. This works just fine.
obj = VideoReader('Climate.mp4');
for k = 1 : obj.NumberOfFrames
this_frame = read(obj, k);
imshow(this_frame);
title(sprintf('Frame #%d', k), 'FontSize', 14);
drawnow; % Force immediate repaint of screen.
pause(0.1); % Increase number to slow it down more.
if rem(k, 5) == 0 % Ask every fifth frame
promptMessage = sprintf('Showing Frame #%d.\nDo you want to Continue processing,\nor Quit processing?', k);
titleBarCaption = 'Continue?';
buttonText = questdlg(promptMessage, titleBarCaption, 'Continue', 'Quit', 'Continue');
if strcmpi(buttonText, 'Quit')
break;
end
end
end

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更多回答（1 个）

Osita Onyejekwe
Osita Onyejekwe 2017-4-7
Here is another look
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Osita Onyejekwe
Osita Onyejekwe 2017-4-10
Thank you so much. All is perfect now!!!
Osita Onyejekwe
Osita Onyejekwe 2017-4-10
Final Final Final question.
Given this code, is there a way I can save all the frames into a folder as image files as I run the code?
obj = VideoReader('Climate.mp4'); for k = 1 : obj.NumberOfFrames this_frame = read(obj, k); imshow(this_frame); title(sprintf('Frame #%d', k), 'FontSize', 14); drawnow; % Force immediate repaint of screen. pause(0.1); % Increase number to slow it down more. if rem(k, 5) == 0 % Ask every fifth frame promptMessage = sprintf('Showing Frame #%d.\nDo you want to Continue processing,\nor Quit processing?', k); titleBarCaption = 'Continue?'; buttonText = questdlg(promptMessage, titleBarCaption, 'Continue', 'Quit', 'Continue'); if strcmpi(buttonText, 'Quit') break; end end end
thank you!!!

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