RGB/BGR to HSV - 2023.2 English

Vitis Libraries
Release Date
2023-12-20
Version
2023.2 English
The (rgb/bgr)2hsv function converts a 3-channel RGB image to HSV color space.
5.542499999999997 V = max ( R , G , B )
21.551249999999996 S = ⎧ ⎩ ⎨ V - min ( R , G , B ) V             i f   V ≠ 0 0                       o t h e r w i s e
27.525000000000006 H = ⎧ ⎩ ⎨ 60 ⎛ ⎝ G - B ⎞ ⎠ / ⎛ ⎝ V - m i n ( R , G , B ) ⎞ ⎠                                           i f     V = R 120 + 60 ⎛ ⎝ B - R ⎞ ⎠ / ⎛ ⎝ V - m i n ( R , G , B ) ⎞ ⎠           i f   V = G 240 + 60 ⎛ ⎝ R - G ⎞ ⎠ / ⎛ ⎝ V - m i n ( R , G , B ) ⎞ ⎠             i f   V = B
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 rgb2hsv(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 bgr2hsv(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 428 Table RGB/BGR2HSV 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 HSV output image

Resource Utilization

The following table summarizes the resource utilization of RGB/BGR2HSV 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 429 Table RGB/BGR2HSV Function Resource Utilization Summary
Operating Mode Operating Frequency (MHz) Utilization Estimate
BRAM_18K DSP_48Es FF LUT
1 Pixel 300 6 8 1582 1274

Performance Estimate

The following table summarizes the performance of RGB/BGR2HSV 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 430 Table RGB/BGR2HSV Function Performance Estimate Summary
Operating Mode Latency Estimate
Max Latency (ms)
1 pixel operation (300 MHz) 6.9