BGR to GRAY - 2024.1 English

Vitis Libraries

Release Date
2024-05-30
Version
2024.1 English

The bgr2gray function converts a 3-channel BGR image to GRAY format.

Y= 0.299*R+0.587*G+0.114*B

Where,

  • Y = Gray pixel
  • 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 bgr2gray(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 421 Table bgr2gray 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,1-channel is supported (XF_8UC1).
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 BGR input image
_dst GRAY output image

Resource Utilization

The following table summarizes the resource utilization of BGR to GRAY 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 422 Table bgr2gray Function Resource Utilization Summary
Operating Mode Operating Frequency (MHz) Utilization Estimate
BRAM_18K DSP_48Es FF LUT
1 Pixel 300 0 3 439 280

Performance Estimate

The following table summarizes the performance of BGR to GRAY 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 bgr2gray Function Performance Estimate Summary

Operating Mode Latency Estimate
Max Latency (ms)
1 pixel operation (300 MHz) 6.9