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about DetectObject (FreeFrame DShow9)

open source

• code available via:https://github.com/vvvv/vvvv-sdk/tree/develop/vvvv45/src/nodes/freeframes/DetectObject
• includes project files for the Code::Blocks c++ IDE
• depends on opencv 1.0 libraries

usage

DetectObject is simply a wrapper around the openCV function cvHaarDetectObjects.

DetectObject finds rectangular regions in the given image that are likely to contain objects the cascade has been trained for and returns those regions as a sequence of rectangles. DetectObject scans the image several times at different scales (-> Scale Cascade). Each time it considers overlapping regions in the image and applies the classifiers to the regions. It may also apply some heuristics to reduce number of analyzed regions, such as Canny pruning. After it has proceeded and collected the candidate rectangles (regions that passed the classifier cascade), it groups them and returns a sequence of average rectangles for each large enough group. The default parameters:

• Scale Cascade = 0.1
• Min Neighbours = 3
• Canny Pruning = 0

are tuned for accurate yet slow face detection. For faster face detection on real video images the better settings are:

• Scale Cascade = 0.2
• Min Neighbours = 2
• Canny Pruning = 1

text adopted from:
Emgu CV Library Documentation

Training Files

training files and an application to create those files are shipped with openCVhttp://sourceforge.net/projects/opencvlibrary

there is a wiki with some haarcascade training files for different purposes.

Links

OpenCVwiki

release info

• 17 06 07
• added Unique IDs and Lifetime pins (development sponsored by dotdotdot)