YUYV to NV12
ThexFyuyv2nv12function converts a single-channel YUYV (YUV 4:2:2) image format to NV12 (YUV 4:2:0) format. YUYV is a sub-sampled format, 1 set of YUYV value gives 2 Y values and 1 U and V value each.
API Syntax
template void xFyuyv2nv12(xF::Mat & _src,xF::Mat & _y_image,xF::Mat & _uv_image) Parameter Descriptions
The following table describes the template and the function parameters.
| Parameter | Description |
|---|---|
| SRC_T | Input pixel type. Only 16-bit, unsigned, 1-channel is supported (XF_16UC1). |
| Y_T | Output pixel type. Only 8-bit, unsigned, 1-channel is supported (XF_8UC1). |
| UV_T | Output UV image pixel type. Only 8-bit, unsigned, 2-channel is supported (XF_8UC2). |
| ROWS | Maximum height of input and output image (must be a multiple of 8). |
| COLS | Maximum width of input and output image (must be a multiple of 8). |
| NPC | Number of pixels to be processed per cycle; possible options are XF_NPPC1 and XF_NPPC8 for 1 pixel and 8 pixel operations respectively. |
| NPC_UV | Number of UV image Pixels to be processed per cycle; possible options are XF_NPPC1 and XF_NPPC4 for 1 pixel and 8 pixel operations respectively. |
| _src | Input image of size (ROWS, COLS). |
| _y_image | Output Y plane of size (ROWS, COLS). |
| _uv_image | Output U plane of size (ROWS/2, COLS/2). |
Resource Utilization
The following table summarizes the resource utilization of YUYV to NV12 for different configurations, generated usingVivado HLS 2017.1tool for theXilinx Xczu9eg-ffvb1156-1-i-es1FPGA, to process a HD (1080x1920) image.
| Operating Mode | Operating Frequency (MHz) |
Utilization Estimate | ||||
|---|---|---|---|---|---|---|
| BRAM_18K | DSP_48Es | FF | LUT | CLB | ||
| 1pixel | 300 | 0 | 0 | 831 | 491 | 149 |
| 8pixel | 150 | 0 | 0 | 1196 | 632 | 161 |
Performance Estimate
The following table summarizes the performance of YUYV to NV12 for different configurations, as generated usingVivado HLS 2017.1tool for theXilinx Xczu9eg-ffvb1156-1-i-es1, to process a grayscale HD (1080x1920) image.
| Operating Mode | Latency Estimate |
|---|---|
| Max Latency (ms) | |
| 1 pixel operation(300Mhz) | 6.9 |
| 8 pixel operation(150Mhz) | 1.7 |