Calculating Light Intensity through video

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Using a camera, how can I detect light intensity and use that as a marker. Can someone guide me to a thread that could help me develop a script for this.
Thank you

Accepted Answer

Image Analyst
Image Analyst on 19 Jun 2014
Use the Image Acquisition Toolbox and call getsnapshot(). Then get the intensity from whatever pixels you want in the image.
  2 Comments
Andrew
Andrew on 19 Jun 2014
Thank you for the reply. Unfortunately, I do not have access to that toolbox. Is there any way I can achieve this from scratch? Maybe get the video stream as a matrix and calculate the intensity through that?
Thanks
Image Analyst
Image Analyst on 30 Jun 2014
With Release R2014a you can now access the webcam without the Image Acquisition Toolbox. See http://www.mathworks.com/support/2014a/matlab/8.3/demos/webcam-support.html

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