cv::cuda::Stream synchronization on gaussian filter

cudawarped · August 1, 2025, 4:57am

There is an internal _buf which belongs to the filter

modules/cudafilters/src/filtering.cpp

cb495d9b7


      
          
          private:
              typedef void (*func_t)(PtrStepSzb src, PtrStepSzb dst, const float* kernel, int ksize, int anchor, int brd_type, int cc, cudaStream_t stream);
          
              int srcType_, bufType_, dstType_;
              GpuMat rowKernel_, columnKernel_;
              func_t rowFilter_, columnFilter_;
              Point anchor_;
              int rowBorderMode_, columnBorderMode_;
          
              GpuMat buf_;
          };
          
          SeparableLinearFilter::SeparableLinearFilter(int srcType, int dstType,
                                                       InputArray _rowKernel, InputArray _columnKernel,
                                                       Point anchor, int rowBorderMode, int columnBorderMode) :
              srcType_(srcType), dstType_(dstType), anchor_(anchor), rowBorderMode_(rowBorderMode), columnBorderMode_(columnBorderMode)
          {
              static const func_t rowFilterFuncs[7][4] =
              {
                  {filter::linearRow<uchar, float>, 0, filter::linearRow<uchar3, float3>, filter::linearRow<uchar4, float4>},

As a result you need to use a different filter per stream. e.g.

auto gaussFilterS1 = cv::cuda::createGaussianFilter(CV_8UC1, CV_8UC1, kernelSizeGaussian, 0.0);

auto gaussFilterS1 = cv::cuda::createGaussianFilter(CV_8UC1, CV_8UC1, kernelSizeGaussian, 0.0);

This needs to be documented.

Topic		Replies	Views
Opencv cuda stream optimisation C++ cuda	1	1098	August 18, 2022
OpenCV-cuda : run the same function in parallel on diferent data using streams? C++ cuda	6	659	August 5, 2022
What cuda stream do OpenCV::Cuda functions use? cuda	8	454	March 28, 2024
CUDA flag to create a cv::cuda::Stream that supports asynchronous calls C++ gpu , cuda	1	1155	July 20, 2022
What cuda stream notes mean? Android/Java cuda	1	350	October 20, 2021

cv::cuda::Stream synchronization on gaussian filter

Related topics