IYUV to YUV4 - 2024.1 English

Vitis Libraries

Release Date
2024-05-30
Version
2024.1 English

The iyuv2yuv4 function converts a single channel IYUV image to a YUV444 format. Y plane is same for both the formats. The inputs are separate U and V planes of IYUV image and the outputs are separate U and V planes of YUV4 image. IYUV stores subsampled U,V values. YUV format stores U and V values for every pixel. The same U, V values are duplicated for 2 rows and 2 columns (2x2) pixels in order to get the required data in the YUV444 format.

API Syntax

template<int SRC_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_IN_3 = _XFCVDEPTH_DEFAULT, int XFCVDEPTH_IN_4 = _XFCVDEPTH_DEFAULT, int XFCVDEPTH_IN_5 = _XFCVDEPTH_DEFAULT>
void iyuv2yuv4(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<SRC_T, ROWS, COLS, NPC, XFCVDEPTH_IN_3> & _y_image, xf::cv::Mat<SRC_T, ROWS, COLS, NPC, XFCVDEPTH_IN_4> & _u_image, xf::cv::Mat<SRC_T, ROWS, COLS, NPC, XFCVDEPTH_IN_5> & _v_image)

Parameter Descriptions

The following table describes the template and the function parameters.

Table 398 Table iyuv2yuv4 Parameter Description
Parameter Description
SRC_T Input pixel type. Only 8-bit, unsigned, 1-channel is supported (XF_8UC1).
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_IN_3 Depth of input image
XFCVDEPTH_IN_4 Depth of input image
XFCVDEPTH_IN_5 Depth of input 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).
_y_image Output Y image of size (ROWS, COLS).
_u_image Output U image of size (ROWS, COLS).
_v_image Output V image of size (ROWS, COLS).

Resource Utilization

The following table summarizes the resource utilization of IYUV to YUV4 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 399 Table iyuv2yuv4 Function Resource Utilization Summary
Operating Mode Operating Frequency (MHz) Utilization Estimate
BRAM_18K DSP_48Es FF LUT CLB
1 Pixel 300 0 0 1398 870 232
8 Pixel 150 0 0 2134 1214 304

Performance Estimate

The following table summarizes the performance of IYUV to YUV4 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 400 Table iyuv2yuv4 Function Performance Estimate Summary
Operating Mode Latency Estimate
Max Latency (ms)
1 pixel operation (300 MHz) 13.8
8 pixel operation (150 MHz) 3.4