Pyramid Up - 2023.2 English

The pyrUp function is an image up-sampling algorithm. It first inserts zero rows and zero columns after every input row and column making up to the size of the output image. The output image size is always . The zero padded image is then smoothened using Gaussian image filter. Gaussian filter for the pyramid-up function uses a fixed filter kernel as given below:

However, to make up for the pixel intensity that is reduced due to zero padding, each output pixel is multiplied by 4.

API Syntax

template<int TYPE, int ROWS, int COLS, int NPC, int XFCVDEPTH_IN = _XFCVDEPTH_DEFAULT, int XFCVDEPTH_OUT = _XFCVDEPTH_DEFAULT>
void pyrUp (xf::cv::Mat<TYPE, ROWS, COLS, NPC, XFCVDEPTH_IN> & _src, xf::cv::Mat<TYPE, ROWS, COLS, NPC, XFCVDEPTH_OUT> & _dst)

Parameter Descriptions

The following table describes the template and the function parameters.

Resource Utilization

The following table summarizes the resource utilization of pyrUp for 1 pixel per cycle implementation, for a maximum input image size of 1920x1080 pixels. The results are after synthesis in Vivado HLS 2019.1 for the Xilinx Xczu9eg-ffvb1156-1-i-es1 FPGA at 300 MHz.

The following table summarizes the resource utilization of pyrUp for 1 pixel per cycle implementation, for a maximum input image size of 4K with BGR. The results are after synthesis in Vivado HLS 2019.1 for the Xilinx Xczu9eg-ffvb1156-1-i-es1 FPGA at 300 MHz.

Performance Estimate

The following table summarizes performance estimates of pyrUp function on Vivado HLS 2019.1 for the Xilinx Xczu9eg-ffvb1156-1-i-es1 FPGA.