How to save the output Video using Videowriter.

Question

VENKATA NARESH MALLADI 2017-3-31

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/332913-how-to-save-the-output-video-using-videowriter

回答： Sharmila Raghu 2017-4-4

I am tracking an object by mouse selection and want to save the video with tracking results. Here is my code.

videoReader = vision.VideoFileReader('1.mp4');
videoFrame      = step(videoReader);
figure; imshow(videoFrame); title('Select the Object');
rect = getrect;
bboxPoints = bbox2points(rect(1, :));
pointTracker = vision.PointTracker('MaxBidirectionalError', 2);
points = bboxPoints;
initialize(pointTracker, points, videoFrame);
videoPlayer  = vision.VideoPlayer('Position',...
    [100 100 [size(videoFrame, 2), size(videoFrame, 1)]+30]);
oldPoints = points;
while ~isDone(videoReader)
      videoFrame = step(videoReader);
      [points, isFound] = step(pointTracker, videoFrame);
  visiblePoints = points(isFound, :);
      oldInliers = oldPoints(isFound, :);
      if size(visiblePoints, 1) >= 1 % need at least 2 points
          [xform, oldInliers, visiblePoints] = estimateGeometricTransform(...
              oldInliers, visiblePoints, 'similarity', 'MaxDistance', 4);
          bboxPolygon = reshape(bboxPoints', 1, []);
          videoFrame = insertShape(videoFrame, 'Polygon', bboxPolygon, ...
              'LineWidth', 2); 
          videoFrame = insertMarker(videoFrame, visiblePoints, '+', ...
              'Color', 'white');       
          oldPoints = visiblePoints;
          setPoints(pointTracker, oldPoints);        
      end
      % Display the annotated video frame using the video player object
      step(videoPlayer, videoFrame);
       % stop(reader);
  end
release(videoFileReader);
release(videoPlayer);
release(pointTracker);