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HogDescriptor DaimlerPeopleDetector does not work

asked 2012-10-17 08:22:45 -0500

JuKauf gravatar image

updated 2012-10-19 01:06:48 -0500

Kirill Kornyakov gravatar image

Hi,

We are currently working on an implementation using the HOGDetector to detect people in a given video stream. We are using the Default People Detector which works for us, but it very often detects only parts of the person.

So we wanted to test how the DaimlerPeopleDetector works. Unfortunately using this detector we never get any detected Person. The output is simply empty.

Code:

cv::HOGDescriptor hog(cv::Size(48, 96), cv::Size(16, 16), cv::Size(8, 8), cv::Size(8, 8), 9, 1,-1, cv::HOGDescriptor::L2Hys, 0.2, true, cv::HOGDescriptor::DEFAULT_NLEVELS);
    hog.setSVMDetector(cv::HOGDescriptor::getDaimlerPeopleDetector());

hog.detectMultiScale(tempFrame, found);

Does anyone have suggestions or knows the problem? Your help will be highly appreciated!

Regards, Julian

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answered 2012-11-27 17:08:22 -0500

hoangnguyen79 gravatar image

Have you set the window size of the HOG detector: hog.winSize = Size(48, 96);

The reason is that the Daimler classifier was trained using training images of that size. Only with that image size will the HOG feature vector has the correct dimensions of 1981, which can be fed into the Daimler SVM classifier.

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Asked: 2012-10-17 08:22:45 -0500

Seen: 3,199 times

Last updated: Nov 27 '12