Setting up vision.VideoFileWriter in multiObjectTracking.

I need to write my tracking results to a new video file but Function obj is not accepting the filewriter variable:

obj = setupSystemObjects();

...

function obj = setupSystemObjects()
        % Initialize Video I/O
      % Create objects for reading a video from a file, drawing the tracked
      % objects in each frame, and playing the video.

        % Create a video file reader.
        obj.reader = vision.VideoFileReader('D4_17.avi');

        % Create two video players, one to display the video,
        % and one to display the foreground mask.
        obj.videoPlayer = vision.VideoPlayer('Position', [20, 200, 700, 400]);
        obj.maskPlayer = vision.VideoPlayer('Position', [740, 200, 700, 400]);
        obj.videoFWriter = vision.VideoFileWriter('C:\Users\Daevin\Videos\Loop\test.avi', ...
            'FrameRate', videoFReader.info.VideoFrameRate');
        % Create system objects for foreground detection and blob analysis

        % The foreground detector is used to segment moving objects from
        % the background. It outputs a binary mask, where the pixel value
        % of 1 corresponds to the foreground and the value of 0 corresponds
        % to the background.

        obj.detector = vision.ForegroundDetector('NumGaussians', 3, ...
            'NumTrainingFrames', 40, 'MinimumBackgroundRatio', 0.7);

        % Connected groups of foreground pixels are likely to correspond to moving
        % objects.  The blob analysis system object is used to find such groups
        % (called 'blobs' or 'connected components'), and compute their
        % characteristics, such as area, centroid, and the bounding box.

        obj.blobAnalyser = vision.BlobAnalysis('BoundingBoxOutputPort', true, ...
            'AreaOutputPort', true, 'CentroidOutputPort', true, ...
            'MinimumBlobArea', 400);
 end

Error:Undefined function or variable 'setupSystemObjects'.

Any help would be greatly appriciated.

Answer 1

[Dima Lisin]

Hi Daevin,

Are you modifying the example script? Are you running the modified script, or are you trying to run setupSystemObjects on the command line?