The iyuv2rgba function converts single channel IYUV (YUV 4:2:0)
image to a 4-channel RGBA image and iyuv2rgb function converts
single channel IYUV (YUV 4:2:0) image to a 3-channel RGB image . The
inputs to the function are separate Y, U, and V planes. IYUV is sub
sampled format, U and V values are sampled once for 2 rows and 2 columns
of the RGBA/RGB pixels. The data of the consecutive rows of size
(columns/2) is combined to form a single row of size (columns).
API Syntax
template<int SRC_T, int DST_T, int ROWS, int COLS, int NPC=1, int XFCVDEPTH_IN_0 = _XFCVDEPTH_DEFAULT, int XFCVDEPTH_IN_1 = _XFCVDEPTH_DEFAULT, int XFCVDEPTH_IN_2 = _XFCVDEPTH_DEFAULT, int XFCVDEPTH_OUT = _XFCVDEPTH_DEFAULT>
void iyuv2rgba(xf::cv::Mat<SRC_T, ROWS, COLS, NPC, XFCVDEPTH_IN_0> & src_y, xf::cv::Mat<SRC_T, ROWS/4, COLS, NPC, XFCVDEPTH_IN_1> & src_u,xf::cv::Mat<SRC_T, ROWS/4, COLS, NPC, XFCVDEPTH_IN_2> & src_v, xf::cv::Mat<DST_T, ROWS, COLS, NPC, XFCVDEPTH_OUT> & _dst0)
template<int SRC_T, int DST_T, int ROWS, int COLS, int NPC=1, int XFCVDEPTH_IN_0 = _XFCVDEPTH_DEFAULT, int XFCVDEPTH_IN_1 = _XFCVDEPTH_DEFAULT, int XFCVDEPTH_IN_2 = _XFCVDEPTH_DEFAULT, int XFCVDEPTH_OUT = _XFCVDEPTH_DEFAULT>
void iyuv2rgb(xf::cv::Mat<SRC_T, ROWS, COLS, NPC, XFCVDEPTH_IN_0> & src_y, xf::cv::Mat<SRC_T, ROWS/4, COLS, NPC, XFCVDEPTH_IN_1> & src_u,xf::cv::Mat<SRC_T, ROWS/4, COLS, NPC, XFCVDEPTH_IN_2> & src_v, xf::cv::Mat<DST_T, ROWS, COLS, NPC, XFCVDEPTH_OUT> & _dst0)
Parameter Descriptions
The following table describes the template and the function parameters.
| Parameter | Description |
|---|---|
| SRC_T | Input pixel type. Only 8-bit, unsigned, 1-channel is supported (XF_8UC1). |
| DST_T | Output pixel type. Only 8-bit, unsigned, 4(RGBA) and 3(RGB)-channel are supported (XF_8UC4 and XF_8UC3). |
| ROWS | Maximum height of input and output image. |
| COLS | Maximum width of input and output image. Must be a multiple of 8 for 8 pixel mode. |
| 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. |
| XFCVDEPTH_IN_0 | Depth of input image |
| XFCVDEPTH_IN_1 | Depth of input image |
| XFCVDEPTH_IN_2 | Depth of input image |
| XFCVDEPTH_OUT_2 | Depth of output image |
| src_y | Input Y plane of size (ROWS, COLS). |
| src_u | Input U plane of size (ROWS/4, COLS). |
| src_v | Input V plane of size (ROWS/4, COLS). |
| _dst0 | Output RGBA image of size (ROWS, COLS). |
Resource Utilization
The following table summarizes the resource utilization of IYUV to RGBA/RGB for different configurations, generated using Vivado HLS 2019.1 tool for the Xczu9eg-ffvb1156-1-i-es1 FPGA, to process a HD (1080x1920) image.
| Operating Mode | Operating Frequency (MHz) | Utilization Estimate | ||||
|---|---|---|---|---|---|---|
| BRAM_18K | DSP_48Es | FF | LUT | CLB | ||
| 1 Pixel | 300 | 2 | 5 | 1208 | 728 | 196 |
Performance Estimate
The following table summarizes the performance of IYUV to RGBA/RGB for different configurations, as generated using the Vivado HLS 2019.1 version tool for the Xczu9eg-ffvb1156-1-i-es1, to process a grayscale HD (1080x1920) image.
| Operating Mode | Latency Estimate |
|---|---|
| Max Latency (ms) | |
| 1 pixel operation (300 MHz) | 6.9 |