0 个投票

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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 采纳的回答

Image Analyst
Image Analyst 2017-4-7

0 个投票

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
how do I pause a frame?
Thank you very much by the way
Image Analyst
Image Analyst 2017-4-7
To put in a pause so that the user needs to click to continue on to the next frame, insert this code just before the "end" of the loop:
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
Osita Onyejekwe
Osita Onyejekwe 2017-4-7
wow, that is really awesome. It works very well. Thank you so much. Final question, the pop up bar appears for every frame, and it takes a while since I have to keep on clicking continue and continue to get to the specific frame that i want, Is there a way to slow down the pop up bar so that it appears slower and not every single frame.
Thanks alot!! YOU ROCK!!!
Image Analyst
Image Analyst 2017-4-7
You can put it inside an if where you use rem to call it every n'th time.
if rem(k, 5) == 0
% Ask every fifth frame
buttonText = questdlg(..........
end
Osita Onyejekwe
Osita Onyejekwe 2017-4-7
is this proper syntax?
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; end if rem(k, 5) == 0 % Ask every fifth frame buttonText = questdlg(.......... end end
Osita Onyejekwe
Osita Onyejekwe 2017-4-7
i have this code,
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; rem(k, 5) == 0 % Ask every fifth frame buttonText = questdlg(..........
end
end
and for the rem(k, 5) == 0 , the double '==' is underlined in red with the statement and possibly following ones cannot be reached
Osita Onyejekwe
Osita Onyejekwe 2017-4-7
This is my latest 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. 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; rem(k, 5) == 0 % Ask every fifth frame buttonText = questdlg(promptMessage, titleBarCaption, 'Continue', 'Quit', 'Continue'); end
end
Osita Onyejekwe
Osita Onyejekwe 2017-4-7
it runs but it is still displaying the prompt every single frame
Image Analyst
Image Analyst 2017-4-7
You didn't use the "if" before the rem() like I had. Put that back in.
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

0 个投票

Here is another look

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Image Analyst
Image Analyst 2017-4-7
This is NOT an answer to your original question. It should have been appended as a comment to your and my prior comments above.
I gave you code that works here: https://www.mathworks.com/matlabcentral/answers/334239-capturing-the-same-frame#comment_444016
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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