IYUV to RGBA/RGB - 2024.1 English

Vitis Libraries

Release Date
2024-05-30
Version
2024.1 English

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.

Table 392 Table iyuv2(rgba/rgb) Parameter Description
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.

Table 393 Table iyuv2(rgba/rgb) Function Resource Utilization Summary
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.

Table 394 Table iyuv2(rgba/rgb) Function Performance Estimate Summary
Operating Mode Latency Estimate
Max Latency (ms)
1 pixel operation (300 MHz) 6.9