In the memory map based kernels such as crop, Mean-shift tracking and bounding box, the input read will be for particular block of memory based on the requirement for the algorithm. The streaming interfaces will require the image to be read in raster scan manner, which is not the case for the memory mapped kernels. The methodology to handle this case is as follows:
extern “C”
{
void func_top (ap_uint *gmem_in, ap_uint *gmem_out, ...) {
xf::cv::Mat<…> in_mat(…,gmem_in), out_mat(…,gmem_out);
xf::cv::kernel<…> (in_mat, out_mat…);
}
}
The gmem pointers must be mapped to the xf::cv::Mat objects during the object creation, and then the memory mapped kernels are called with these mats at the interface. It is necessary that the pointer size must be same as the size required for the xf::Vitis-Vision-func, unlike the streaming method where any higher size of the pointers (till 512-bits) are allowed.