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Editorial Team
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Editorial Team
Asked: June 6, 20262026-06-06T22:42:12+00:00 2026-06-06T22:42:12+00:00

I am using cvCalcOpticalFlowLK function in my code (OpenCV 2.4.1 and Ubuntu 12.04). I

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I am using cvCalcOpticalFlowLK function in my code (OpenCV 2.4.1 and Ubuntu 12.04).
I am missing the header file for and getting this error:

opticalflowLK.c: In function ‘int main(int, char**)’:
opticalflowLK.c:33:67: error: ‘cvCalcOpticalFlowLK’ was not declared in this scope

Can anyone please tell me the header file for cvCalcOpticalFlowLK?

Thanks.

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  1. Editorial Team
    Editorial Team
    2026-06-06T22:42:14+00:00Added an answer on June 6, 2026 at 10:42 pm

    This function is deprecated that’s why you can’t use it.

    • If you code on c (not c++) you have to call cvCalcOpticalFlowPyrLK instead.
    • If you code on c++ than it’s better to use new OpenCV interface and call calcOpticalFlowPyrLK.

    Header for them is opencv2/video/tracking.hpp.

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