GRAY to BGR - 2023.2 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 413 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 414 Table gray2bgr Function Resource Utilization Summary
Operating Mode	Operating Frequency (MHz)	Utilization Estimate
Operating Mode	Operating Frequency (MHz)	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 415 Table gray2bgr Function Performance Estimate Summary
Operating Mode	Latency Estimate
Operating Mode	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.

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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 416 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 417 Table HLS2RGB/BGR Function Resource Utilization Summary
Operating Mode	Operating Frequency (MHz)	Utilization Estimate
Operating Mode	Operating Frequency (MHz)	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 418 Table HLS2RGB/BGR Function Performance Estimate Summary
Operating Mode	Latency Estimate
Operating Mode	Max Latency (ms)
1 pixel operation (300 MHz)	6.9