Max - 2024.1 English

Vitis Libraries

Release Date
2024-05-30
Version
2024.1 English

The Max function calculates the per-element maximum of two corresponding images src1, src2 and stores the result in dst.

dst(x,y)=max( src1(x,y) ,src2(x,y) )

API Syntax

template< int SRC_T , int ROWS, int COLS, int NPC=1, int XFCVDEPTH_IN_1 = _XFCVDEPTH_DEFAULT, int XFCVDEPTH_IN_2 = _XFCVDEPTH_DEFAULT, int XFCVDEPTH_OUT_1 = _XFCVDEPTH_DEFAULT>
void max(xf::cv::Mat<SRC_T, ROWS, COLS, NPC, XFCVDEPTH_IN_1> & _src1, xf::cv::Mat<SRC_T, ROWS, COLS, NPC, XFCVDEPTH_IN_2> & _src2, xf::cv::Mat<SRC_T, ROWS, COLS, NPC, XFCVDEPTH_OUT_1> & _dst)

Parameter Descriptions

The following table describes the template and the function parameters.

Table 656 Table . Max 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.
XFCVDEPTH_IN_1 Depth of the input image.
XFCVDEPTH_IN_2 Depth of the input image.
XFCVDEPTH_OUT_1 Depth of the output image.
_src1 First input image
_src2 Second input image
_dst Output image

Resource Utilization

The following table summarizes the resource utilization of the Max 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 657 Table . Max 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 103 153
LUT 44 102
CLB 21 38

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 658 Table . Max 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