template <int SRC_T, int Y_T, int UV_T, int ROWS, int COLS, int NPC=1,int NPC_UV=1, int XFCVDEPTH_IN = _XFCVDEPTH_DEFAULT, int XFCVDEPTH_OUT_0 = _XFCVDEPTH_DEFAULT, int XFCVDEPTH_OUT_1 = _XFCVDEPTH_DEFAULT>void bgr2nv21(xf::cv::Mat<SRC_T, ROWS, COLS, NPC, XFCVDEPTH_IN> & _src, xf::cv::Mat<Y_T, ROWS, COLS, NPC, XFCVDEPTH_OUT_0> & _y, xf::cv::Mat<UV_T, ROWS/2, COLS/2, NPC_UV, XFCVDEPTH_OUT_1> & _uv)
Parameter Descriptions
The following table describes the template and the function parameters.
| Parameter | Description |
|---|---|
| SRC_T | Input pixel type. Only 8-bit, unsigned, 3-channel is supported (XF_8UC3). |
| Y_T | Output pixel type. Only 8-bit, unsigned, 1-channel is supported (XF_8UC1). |
| UV_T | Output pixel type. Only 8-bit, unsigned, 2-channel is supported (XF_8UC2). |
| ROWS | Maximum height of input and output image |
| COLS | Maximum width of input and output image. Must be a multiple of NPC for N pixel mode. |
| NPC | Number of Pixels to be processed per cycle. Possible options are XF_NPPC1,XF_NPPC2,XF_NPPC4 and XF_NPPC8. |
| NPC_UV | Number of Pixels to be processed per cycle. Possible options are XF_NPPC1,XF_NPPC2 and XF_NPPC4 |
| XFCVDEPTH_IN | Depth of input image |
| XFCVDEPTH_OUT_0 | Depth of output image |
| XFCVDEPTH_OUT_1 | Depth of output image |
| _src | RGB input image of size(ROWS,COLS) |
| _y | Output Y image of size (ROWS, COLS). |
| _uv | Output UV image of size (ROWS/2, COLS/2). |
Resource Utilization
The following table summarizes the resource utilization of RGB/BGR
to NV12/NV21 function in Normal mode (1-Pixel), as generated in the
Vivado HLS 2019.1 tool for the Xilinx xczu9eg-ffvb1156-2-i-es2 FPGA to
process a HD (1080x1920) image.
Operating Mode Operating Frequency (MHz) Utilization Estimate BRAM_18K DSP_48Es FF LUT CLB 1 Pixel 300 0 9 413 279 66
Performance Estimate
The following table summarizes the performance of the kernel in single pixel configuration as generated using Vivado HLS 2019.1 tool for the Xilinx xczu9eg-ffvb1156-2-i-es2 FPGA to process a HD (1080x1920) image.
| Operating Mode | Latency Estimate |
|---|---|
| Max Latency (ms) | |
| 1 pixel operation (300 MHz) | 6.9 |