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For the “Audio and Video Processing” lecture tomorrow I had to write some simple video filters. The professor recommended to use the DirectShow SDK. But everyone who knows me knows that when there is a way to do something without Windows I will do it without! So I used the OpenCV library from Intel. Which I know from my last semester project. I wrote a little program who uses the iSight as video source. (based on the OpenCV XCode example project) You can select 8 diffrent video filters by pressing number 1-8 on your keyboard.

• 0: no filter
• 1: 3×3 Sobelfilter Horizontal
• 2: 3×3 Sobelfilter Vertical
• 3: 3×3 Laplace
• 4: 3×3 Box Filter
• 5: 3×3 Gauss Filter
• 6: 5×5 Gauss Filter
• 5: 5×5 Box Filter
• 6: 7×7 Box Filter (overflow)

With the key ‘t’ you can add an additional filter who generates four abstract colored pictures.

Downloads:

• Sourcecode: Filters.c
• XCode Project: Filters.zip
• OpenCV.framework
• Compiled Binary: FaceTracker.app.zip