YCrCb to RGB/BGR - 2024.1 English

Vitis Libraries

Release Date
2024-05-30
Version
2024.1 English

The ycrcb2(rgb/bgr) function converts YCrCb color space to 3-channel RGB/BGR image.

Where,

  • R= Y+1.403*(Cr-delta)
  • G= Y-0.714*(Cr-delta)-0.344*(cb-delta)
  • B= Y+1.773+(Cb-delta)

26.715000000000003 d e l t a =     128           f o r   8 - b i t   i m a g e s 32768     f o r   16 - b i t   i m a g e s 0.5   f o r   f l o a t i n g   p o i n t   i m a g e s

API Syntax

template<int SRC_T,int DST_T,int ROWS,int COLS,int NPC=1, int XFCVDEPTH_IN = _XFCVDEPTH_DEFAULT, int XFCVDEPTH_OUT = _XFCVDEPTH_DEFAULT>void ycrcb2rgb(xf::cv::Mat<SRC_T, ROWS, COLS, NPC, XFCVDEPTH_IN> & _src,xf::cv::Mat<DST_T, ROWS, COLS, NPC, XFCVDEPTH_OUT> & _dst)
template<int SRC_T,int DST_T,int ROWS,int COLS,int NPC=1, int XFCVDEPTH_IN = _XFCVDEPTH_DEFAULT, int XFCVDEPTH_OUT = _XFCVDEPTH_DEFAULT>void ycrcb2bgr(xf::cv::Mat<SRC_T, ROWS, COLS, NPC, XFCVDEPTH_IN> & _src,xf::cv::Mat<DST_T, ROWS, COLS, NPC, XFCVDEPTH_OUT> & _dst)

Parameter Descriptions

The following table describes the template and the function parameters.

Table 447 Table YCrCb2RGB/BGR Parameter Description
Parameter Description
SRC_T Input pixel type. Only 8-bit, unsigned, 3-channel is supported (XF_8UC3).
DST_T Output pixel type. Only 8-bit, unsigned, 3-channel is supported (XF_8UC3).
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.
XFCVDEPTH_IN Depth of input image
XFCVDEPTH_OUT Depth of output image
_src YCrCb input image.
_dst RGB/BGR output image.

Resource Utilization

The following table summarizes the resource utilization of YCrCb2RGB/BGR for different configurations, as generated in the Vivado HLS 2019.1 version tool for the Xczu9eg-ffvb1156-1-i-es1 FPGA, to process a HD (1080x1920) image.

Table 448 Table YCrCb2RGB/BGR Function Resource Utilization Summary
Operating Mode Operating Frequency (MHz) Utilization Estimate
BRAM_18K DSP_48Es FF LUT
1 Pixel 300 0 4 538 575

Performance Estimate

The following table summarizes the performance of YCrCb2RGB/BGR for different configurations, as generated using the Vivado HLS 2019.1 version tool for the Xczu9eg-ffvb1156-1-i-es1, to process a HD (1080x1920) image.

Table 449 Table YCrCb2RGB/BGR Function Performance Estimate Summary
Operating Mode Latency Estimate
Max Latency (ms)
1 pixel operation (300 MHz) 6.9