capturing the same frame

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

Answer 1

[Image Analyst]

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

[Osita Onyejekwe]

how do I pause a frame?

Thank you very much by the way

[Image Analyst]

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]

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]

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]

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]

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]

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]

it runs but it is still displaying the prompt every single frame

[Image Analyst]

You didn't use the "if" before the rem() like I had. Put that back in.

[Osita Onyejekwe]

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]

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

Answer 2

[Osita Onyejekwe]

Here is another look

[Osita Onyejekwe]

????

[Image Analyst]

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]

Thank you so much. All is perfect now!!!

[Osita Onyejekwe]

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!!!