OpenCV getMinFilter_GPU

The getMinFilter method takes (int,int,cvSiz开发者_如何转开发e), how is OpenCv expecting me to pass a 2D image in an int?

srcType – Input image type. Only CV_8UC1 and CV_8UC4 are supported.

dstType – Output image type. It supports only the same type as the source type.

gpu::getMinFilter_GPU(int srcType, int dstType, const Size& ksize, Point anchor=Point(-1,-1))

Thanks

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Actually getMinFilter_GPU function does not do any any filtering. It just returns a special "processor" object which is able to do filtering.

Convenient way to use gpu filtering functions in OpenCV is:

• Create a filter object (returned by getMinFilter_GPU and many other functions);
• Create an engine object (for example with createFilter2D_GPU);
• Store obtained pointer in your image processing context (you will kill all the performance if recreate the engine/filters object for each frame);
• For each input frame call apply method of the engine object to make a filtering.

I.e:

 GpuMat src, dst;
 Ptr<FilterEngine_GPU> filter = createFilter2D_GPU(
     getMinFilter_GPU(CV_8UC1, CV_8UC1, Size(3,3)), CV_8UC1, CV_8UC1);
 filter->apply(src, dst);