capturing the same frame

2 次查看（过去 30 天）

Osita Onyejekwe 2017-4-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/334239-capturing-the-same-frame

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

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Image Analyst 2017-4-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/334239-capturing-the-same-frame#answer_262212

在 MATLAB Online 中打开

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

11 个评论
显示 9更早的评论隐藏 9更早的评论

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 2017-4-7

在 MATLAB Online 中打开

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

请先登录，再进行评论。

更多回答（1 个）

Osita Onyejekwe 2017-4-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/334239-capturing-the-same-frame#answer_262242

Here is another look

4 个评论
显示 2更早的评论隐藏 2更早的评论

Osita Onyejekwe 2017-4-10

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

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!!!

请先登录，再进行评论。

请先登录，再回答此问题。