MaxS - 2023.2 English

Vitis Libraries

Release Date
2023.2 English

The MaxS function calculates the maximum elements between src and given scalar value scl and stores the result in dst.

dst(I)=maxS( src(I) ,scl )

API Syntax

template< int SRC_T , int ROWS, int COLS, int NPC=1>
void maxS(xf::cv::Mat<SRC_T, ROWS, COLS, NPC> & _src1, unsigned char _scl[XF_CHANNELS(SRC_T,NPC)], xf::cv::Mat<SRC_T, ROWS, COLS, NPC> & _dst)

Parameter Descriptions

The following table describes the template and the function parameters.

Table 646 Table . MaxS Parameter Description
Parameter Description
SRC_T Input Pixel Type. 8-bit, unsigned, 1 channel is supported (XF_8UC1).
ROWS Maximum height of input and output image.
COLS Maximum width of input and output image. In case of N-pixel parallelism, width should be multiple of N.
NPC Number of pixels to be processed per cycle; possible options are XF_NPPC1 and XF_NPPC8 for 1 pixel and 8 pixel operations respectively.
_src1 First input image
_scl Input scalar value, the size should be number of channels
_dst Output image

Resource Utilization

The following table summarizes the resource utilization of the MaxS function in Resource optimized (8 pixel) mode and normal mode as generated using Vivado HLS 2019.1 version tool for the Xczu9eg-ffvb1156-1-i-es1 FPGA.

Table 647 Table . MaxS Function Resource Utilization Summary
Name Resource Utilization
1 pixel per clock operation 8 pixel per clock operation
  300 MHz 150 MHz
BRAM_18K 0 0
DSP48E 0 0
FF 162 43
LUT 103 104
CLB 32 20

Performance Estimate

The following table summarizes a performance estimate of the kernel in different configurations, generated using Vivado HLS 2019.1 tool for Xczu9eg-ffvb1156-1-i-es1 FPGA to process a grayscale HD (1080x1920) image.

Table 648 Table . MaxS Function Performance Estimate Summary
Operating Mode Latency Estimate
Max Latency (ms)
1 pixel operation (300 MHz) 6.9
8 pixel operation (150 MHz) 1.7