YUYV to NV12 - 2023.2 English

Vitis Libraries

Release Date
2023-12-20
Version
2023.2 English

The yuyv2nv12 function 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<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 yuyv2nv12(xf::cv::Mat<SRC_T, ROWS, COLS, NPC, XFCVDEPTH_IN> & _src,xf::cv::Mat<Y_T, ROWS, COLS, NPC, XFCVDEPTH_OUT_0> & _y_image,xf::cv::Mat<UV_T, ROWS/2, COLS/2, NPC_UV, XFCVDEPTH_OUT_1> & _uv_image)

Parameter Descriptions

The following table describes the template and the function parameters.

Table 365 Table yuyv2nv12 Parameter Description
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.
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.
NPC_UV Number of UV image Pixels to be processed per cycle; possible options are XF_NPPC1 and XF_NPPC8 for 1 pixel and 8 pixel operations respectively.
XFCVDEPTH_IN Depth of input image
XFCVDEPTH_OUT_0 Depth of output image
XFCVDEPTH_OUT_1 Depth of output image
_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 using Vivado HLS 2019.1 tool for the Xczu9eg-ffvb1156-1-i-es1 FPGA, to process a HD (1080x1920) image.

Table 366 Table yuyv2nv12 Function Resource Utilization Summary
Operating Mode Operating Frequency (MHz) Utilization Estimate
BRAM_18K DSP_48Es FF LUT CLB
1 Pixel 300 0 0 831 491 149
8 Pixel 150 0 0 1196 632 161

Performance Estimate

The following table summarizes the performance of YUYV to NV12 for different configurations, as generated using Vivado HLS 2019.1 tool for the Xczu9eg-ffvb1156-1-i-es1, to process a grayscale HD (1080x1920) image.

Table 367 Table yuyv2nv12 Function Performance Estimate Summary
Operating Mode Latency Estimate
Max Latency (ms)
1 pixel operation (300 MHz) 6.9
8 pixel operation (150 MHz) 1.7