What is the minimum version of OpenCL required for OpenCV dnn module.

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https://opencv.org/platforms/opencl.html

When you are using open cv > 3.x, open cl will be used when possible. This includes the dnn implementation.

However, according to these performance measurements https://github.com/opencv/opencv/wiki... It can be that without open cl you are faster. But test by yourself.

Also compare to the native implementation with / without cuda. Yes - a lot of work, but after painful experiences and wasting time, i can give you the advice not to skip it.

@holger, using GPU instead CPU for such complicated algorithms as deep learning networks should be deterministic. So at first we need to compile OpenCV with OpenCL support by cmake option -DWITH_OPENCL=ON then enable OpenCL backend for a specific network by setPreferableTarget(DNN_TARGET_OPENCL)

Ok well then i need to take back what i wrote(please ignore) comment - sorry for the confusion. To use open cl for dnn evaluation you need to:

1. Compile open cv with open cl support
2. Enable it in your program via setPreferableTarget(DNN_TARGET_OPENCL)

I will do this too and do another round of performance measurement. I voted for your comment. Sometimes i am really stupid. Thank you Kurt again! Should i delete my comment from above?

@Akhilesh Stick to the comment of Dkurt