cudaMem in CPU functions

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CudaMem has can be implicitly converted to Mat object

CudaMem cm(100, 100, CV_8UC1);
Mat mat_hdr = cm;
someFunc(mat_hdr);

This operation doesn't copy data, it just create Mat header for CudaMem data.

Hello guys,

I'm quite new in Cuda programming as well. For me it's still quite unclear how to use the CudaMem class. for example how I can do following using page_locked or even zero_copy memory:

Mat srcCpu3ChImg;
Mat outCpu4ChImg;

GpuMat srcGpu3ChImg;
GpuMat outGpu4ChImg;

// load srcCpu3ChImg

srcGpu3ChImg.upload(srcCpu3ChImg);
cv::gpu::cvtColor(srcGpu3ChImg, outGpu4ChImg, CV_BGR2BGRA);
outGpu4ChImg.download(outCpu4ChImg);

thank you a lot in advance cheers greg