IYUV to RGBA

ThexFiyuv2rgbafunction converts single channel IYUV (YUV 4:2:0) image to a 4-channel RGBA 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 pixels. The data of the consecutive rows of size (columns/2) is combined to form a single row of size (columns).

API Syntax

template void xFiyuv2rgba(xF::Mat & src_y, xF::Mat & src_u,xF::Mat & src_v, xF::Mat & _dst0)

Parameter Descriptions

The following table describes the template and the function parameters.

Table 1.xFiyuv2rgba Function Parameter Descriptions
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-channel is supported (XF_8UC4).
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.
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 for different configurations, generated usingVivado HLS 2017.1tool for theXilinx Xczu9eg-ffvb1156-1-i-es1FPGA, to process a HD (1080x1920) image.

Table 2.xFiyuv2rgba Function Resource Utilization Summary
Operating Mode

Operating Frequency

(MHz)

 Utilization Estimate
BRAM_18K DSP_48Es FF LUT CLB
1pixel 300 2 5 1208 728 196

Performance Estimate

The following table summarizes the performance of IYUV to RGBA 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.xFiyuv2rgba Function Performance Estimate Summary
Operating Mode Latency Estimate
Max Latency (ms)
1 pixel operation(300Mhz) 6.9