Companies with a presence in Tampere, Finland have started movement towards making the region a center for imaging expertise, which means focusing efforts in pattern recognition, image enhancement, augmented reality etc.
With this in mind, a get-together event was held in late November, and Ixonos with its bright and enthusiastic engineers had to be there too! Other participants included many participants from the Tampere University of Technology, Intel and several startups and older players in the fields of video surveillance etc.
Instead of just showing up with a stack of callcards, though, we decided to amuse the crowd by whipping up a special demonstration software running on the Intel
MinnowBoard. It turned out well, and was much loved by the participants.
Ixonos Imaging Demo The system consist of a Playstation 3 camera attached to a
MinnowBoard, along with a display for visualising the imaging algorithm results.
MinnowBoard is a small and low cost embedded platform using
Intel® Atom™CPU. In addition, a racing track playset with two electric cars was used as the pattern recognition problem.
The software consists of the
Ixonos Embedded Linux BSP (base support package) , the
OpenCV imaging library and a very simple application that tracks two cars on the racing track, calculating their lap times and counts.
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| Minnowboard (at the back), PS3 camera, racing track! |
Car recognition is done by simple color segmentation. The colors are preset, and blobs of certain color are recognised with the OpenCV routine
. The centroid of each blob is then visualised on the screen, and their passage over the "startline" is tracked. Very simple. Not a display of our pattern recognition algorithm abilities (call us if
that is what you want), but rather of our ability to quickly integrate a
complete system where we could later drop a specialised algorithm into.
And fun. The purpose was to have fun!
More detailed image processing steps:
- Capture image frames (640x480)
- Resize frames down to 320x240
- Blur to reduce noise
- Convert from BGR to HSV color space
- Apply filtering thresholds and create binary image
- Use moments to calculate the position of the center of the object
- Use coordinates to track the object and apply tracking visualizations on top of the image
- Display frames with tracking visualizations
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| The proud author (Ilkka Aulomaa) of the playset car recognition system |
About the authors
Ilkka Aulomaa, M.Sc. - author of the car recognition system software and setup
Mikael Laine, M.Sc. - author of this blogpost, and participator "in spirit" in creating the demonstrator (which means sitting on a sofa and making smart ass comments). He has has written his Master's thesis under the title "On Optical Character Recognition on Mobile Devices" (later published as "A Standalone OCR System for Mobile Cameraphones" in the proceedings of 2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications. He has also participated in research in the field of pattern recognition.
