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color detect

asked 2016-01-12 08:52:25 -0500

baro gravatar image

Hello at all! I'm trying to do a people detect using color histogram to realize it. I would know if exists a function of openCV that works as Canny but not with grayscale. More precisely a funtion that works with color directly. I think that, if exists it, is much more robust that Canny. Could you show me one example? I use histograms to calculate the differences between two images. thank you so much for your help!

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sturkmen gravatar imagesturkmen ( 2016-01-12 08:59:44 -0500 )edit

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answered 2016-01-12 12:08:44 -0500

Kellerspeicher gravatar image

updated 2016-01-12 13:04:45 -0500

There are good examples for face detection and I am not sure if Canny on colour will make sense. But if you want to try:

// Transform Blue, Green, Red to Hue, Saturation, Value
cv::Mat hsv;
cv::cvtColor( frame, hsv, cv::COLOR_BGR2HSV );
// Split the three channels
std::vector< cv::Mat > hsvChannels;
cv::split( hsv, hsvChannels );
// Blur the hue channel
cv::Mat blured;
cv::blur( hsvChannels[0], blured, cv::Size(3,3) );
// Canny the hue channel
cv::Mat canny;
cv::Canny( blured, canny, 100, 300, 3 );

For a good face detection example e.g. look here.

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Asked: 2016-01-12 08:52:25 -0500

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Last updated: Jan 12 '16