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OpenCV 4.5 simple optical flow GPU tutorial cuda::FarnebackOpticalFlow

This OpenCV tutorial is a very simple code example of GPU Cuda optical flow in OpenCV written in c++. The configuration of the project, code, and explanation are included for farneback Optical Flow method. Farneback algorithm is a dense method that is used to process all the pixels in the given image. The dense methods are slower but more accurate as all the pixels of the image are processed. In the following example, I am displaying just a few pixes based on a grid. I am not displaying all the pixes. In the opposite to dense method the sparse method like Lucas Kanade using just a selected subset of pixels. They are faster. Both methods have specific applications. Lucas-Kanade is widely used in tracking. The farneback can be used for the analysis of more complex movement in image scene and furder segmentation based on these changes. As dense methods are slightly slower, the GPU and Cuda implementation can lead to great performance improvements to calculate optical flow for all pixels o
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People tracking and head detection in Opencv example.

Opencv people tracking by head detection

Opencv head detection is much more complicated than the whole body detection.. Learning is the same. All the steps are the same. There is some aspects which just complicate the situation with head detection. First one is that the result detecting the head has more false detection than in case of whole body. There is also important the performace issue. You need to detect in detect multiscale approach just smaller sliding window than in case of whole people detection. That dramatically decrease the performance. The result of the detection should be very slow also on small resolution. 

There is also some positive aspects of head detection. You can simly in multi target tracking example just connect the detection with the tracking history.. That is the main advantage.. 

opencv tracking

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  1. Ahmet Aylin ÖztürkJanuary 9, 2017 at 5:34 AM

    do you have any classifer file to be able to test it?

    ReplyDelete
  2. VlJanuary 10, 2017 at 11:25 AM

    There is different one in the latest post for people and head detecton.. Check the 2017 updates. And share thanks

    ReplyDelete
  3. UnknownMarch 7, 2017 at 7:32 AM

    xml files for this video??

    ReplyDelete
    Replies
    1. VlMarch 12, 2017 at 12:28 PM

      I got some xml file for lbp cascade for cars, people and head here on the blog.. Not for this one.. This is 3 years old work..

      Delete
  4. UnknownJanuary 11, 2019 at 2:04 AM

    can I see the code of this post?

    ReplyDelete

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