I have been looking at the Motion-Based Multiple Object Tracking and was wondering if there was any way a live webcam feed could be used as the video file?

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I have been working with the object tracking that is an example on the support page and I can get it to work while reading a video file, but since it uses the step() function in places i haven't found any way to use a live feed. Thanks in advance for any help offered.
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William Dennehy
William Dennehy on 7 Dec 2016
Hi John, Did you get this working? I've been trying for a while now but the different nested functions keep conflicting with each other. I'm new to Matlab so its trick for me. Thanks.

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Accepted Answer

Dima Lisin
Dima Lisin on 2 Feb 2016
Edited: Dima Lisin on 2 Feb 2016
You can certainly get the video from a webcam instead of a file. Please see the Face Detection and Tracking Using Live Video Acquisition example to learn how to use the Webcam Support Package.
In the Motion-Based Multiple Object Tracking code, you would need to replace vision.VideoFileReader with a webcam object, and the calls to the VideoFileReader's step method with the calls to snapshot .
Alternatively, the Image Acquisition Toolbox has more advanced functionality for configuring cameras and capturing video.
By the way, the step() function you are talking about, is actually a method of the vision.VideoFileReader class. You can find this methods in many classes, and it essentially tells the object to "do its thing", whatever that may be. So to find out what the step method actually does in any particular instance you should check the class of the its first argument, and see its documentation.
  2 Comments
Dima Lisin
Dima Lisin on 3 Feb 2016
In setupSystemObjects replace
cam = webcam();
% Create a video file reader.
obj.reader = snapshot(cam);
with
obj.reader = webcam();
In readFrame replace
frame = obj.reader();
with
frame = snapshot(obj.reader);
webcam() creates the webcam object. snapshot() captures a video frame.

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