IYUV to NV12

ThexFiyuv2nv12function converts single channel IYUV image to NV12 format. The inputs are separate U and V planes. There is no need of processing Y plane as both the formats have a same Y plane. U and V values are rearranged from plane interleaved to pixel interleaved.

API Syntax

template void xFiyuv2nv12(xF::Mat & src_y, xF::Mat & src_u,xF::Mat & src_v,xF::Mat & _y_image, xF::Mat & _uv_image)

Parameter Descriptions

The following table describes the template and the function parameters.

Table 1.xFiyuv2nv12 Function Parameter Descriptions
Parameter Description
SRC_T Input 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 (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 Pixels to be processed per cycle; possible options are XF_NPPC1 and XF_NPPC4 for 1 pixel and 4-pixel operations respectively.
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).
_y_image Output V plane of size (ROWS, COLS).
_uv_image Output UV plane of size (ROWS/2, COLS/2).

Resource Utilization

The following table summarizes the resource utilization of IYUV to NV12 for different configurations, generated usingVivado HLS 2017.1tool for theXilinx Xczu9eg-ffvb1156-1-i-es1FPGA, to process a HD (1080x1920) image..

Table 2.xFiyuv2nv12 Function Resource Utilization Summary
Operating Mode

Operating Frequency

(MHz)

 Utilization Estimate
BRAM_18K DSP_48Es FF LUT CLB
1pixel 300 0 12 907 677 158
8pixel 150 0 12 1591 1022 235

Performance Estimate

The following table summarizes the performance of IYUV to NV12 for different configurations, as generated using theVivado HLS 2017.1version tool for theXilinx Xczu9eg-ffvb1156-1-i-es1, to process a grayscale HD (1080x1920) image.

Table 3.xFiyuv2nv12 Function Performance Estimate Summary
Operating Mode Latency Estimate
Max Latency (ms)
1 pixel operation(300Mhz) 6.9
8 pixel operation(150Mhz) 1.7