BGR to XYZ - 2024.1 English

Vitis Libraries

Release Date
2024-05-30
Version
2024.1 English
The bgr2xyz function converts a 3-channel BGR image to XYZ color space.
22.56 X Y Z =   0.412453 0.357580 0.180423 0.212671 0.715160 0.072169 0.019334 0.119193 0.950227   .   B G R
  • R= Red channel
  • G= Green channel
  • B= Blue channel

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 bgr2xyz(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 435 Table RGB2XYZ 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 BGR input image.
_dst XYZ output image.

Resource Utilization

The following table summarizes the resource utilization of BGR to XYZ 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 436 Table BGR2XYZ Function Resource Utilization Summary
Operating Mode Operating Frequency (MHz) Utilization Estimate
BRAM_18K DSP_48Es FF LUT
1 Pixel 300 0 8 644 380

Performance Estimate

The following table summarizes the performance of BGR to XYZ 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 437 Table BGR2XYZ Function Performance Estimate Summary
Operating Mode Latency Estimate
Max Latency (ms)
1 pixel operation (300 MHz) 6.9

RGB/BGR to YCrCb

The (rgb/bgr)2ycrcb function converts a 3-channel RGB image to YCrCb color space.

  • Y = 0.299*R + 0.587*G + 0.114*B
  • Cr= (R-Y)*0.713+delta
  • Cb= (B-Y)*0.564+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 rgb2ycrcb(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 bgr2ycrcb(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 438 Table RGB/BGR2YCrCb 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 multiple of 8.
COLS Maximum width of input and output image. Must be 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 RGB/BGR input image
_dst YCrCb output image

Resource Utilization

The following table summarizes the resource utilization of RGB/BGR2YCrCb 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 439 Table RGB/BGR2YCrCb Function Resource Utilization Summary
Operating Mode Operating Frequency (MHz) Utilization Estimate
BRAM_18K DSP_48Es FF LUT
1 Pixel 300 0 5 660 500

Performance Estimate

The following table summarizes the performance of RGB/BGR2YCrCb 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 440 Table RGB/BGR2YCrCb Function Performance Estimate Summary
Operating Mode Latency Estimate
Max Latency (ms)
1 pixel operation (300 MHz) 6.9