GRAY to BGR - 2024.1 English

Vitis Libraries

Release Date
2024-05-30
Version
2024.1 English

The gray2bgr function converts a gray intensity image to RGB color format.

R<-Y, G<-Y, B<-Y

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 gray2bgr(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 426 Table gray2bgr 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, 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 GRAY input image.
_dst BGR output image.

Resource Utilization

The following table summarizes the resource utilization of gray2bgr 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 427 Table gray2bgr Function Resource Utilization Summary
Operating Mode Operating Frequency (MHz) Utilization Estimate
BRAM_18K DSP_48Es FF LUT
1 Pixel 300 0 0 156 184

Performance Estimate

The following table summarizes the performance of gray2bgr 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 428 Table gray2bgr Function Performance Estimate Summary
Operating Mode Latency Estimate
Max Latency (ms)
1 pixel operation (300 MHz) 6.9

HLS to RGB/BGR

The hls2(rgb/bgr) function converts HLS color space to 3-channel RGB/BGR image.
6.7434749999999966 C = ( 1 - | 2 L - 1 | ) X   S H S L
12.052500000000002 H ' = H 60 °
5.542499999999997 X = C   X   ( 1 - | H ' m o d 2 - 1   | )
image36
11.722499999999997 m = L - C 2
6.599699999999999 ( R , G , B ) = R 1 + m , G 1 + m   , B 1 + m

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 hls2rgb(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 hls2bgr(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 429 Table HLS2RGB/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 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 HLS input image.
_dst RGB/BGR output image.

Resource Utilization

The following table summarizes the resource utilization of HLS2RGB/BGRR 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 430 Table HLS2RGB/BGR Function Resource Utilization Summary
Operating Mode Operating Frequency (MHz) Utilization Estimate
BRAM_18K DSP_48Es FF LUT
1 Pixel 300 0 3 4366 3096

Performance Estimate

The following table summarizes the performance of HLS2RGB/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 431 Table HLS2RGB/BGR Function Performance Estimate Summary
Operating Mode Latency Estimate
Max Latency (ms)
1 pixel operation (300 MHz) 6.9