MinMax Location

The xFminMaxLoc function finds the minimum and maximum values in an image and location of those values.





API Syntax

template<int SRC_T,int ROWS,int COLS,int NPC>
void xFminMaxLoc(xF::Mat<SRC_T, ROWS, COLS, NPC> & _src,int32_t *max_value, int32_t *min_value,uint16_t *_minlocx, uint16_t *_minlocy, uint16_t *_maxlocx, uint16_t *_maxlocy )

Parameter Descriptions

The following table describes the template and the function parameters.

Table 1. xFminMaxLoc Function Parameter Descriptions
Parameter Description
SRC_T Input pixel type. 8-bit, unsigned, 1 channel (XF_8UC1), 16-bit, unsigned, 1 channel (XF_16UC1), 16-bit, signed, 1 channel (XF_16SC1), 32-bit, signed, 1 channel (XF_32SC1) are supported.
ROWS Number of rows in the image being processed.
COLS Number of columns in the image being processed.
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.
_src Input image
max_val Maximum value in the image, of type int.
min_val Minimum value in the image, of type int.
_minlocx x-coordinate location of the first minimum value.
_minlocy y-coordinate location of the first maximum value.
_maxlocx x-coordinate location of the first minimum value.
_maxlocy y-coordinate location of the first maximum value.

Resource Utilization

The following table summarizes the resource utilization of the xFminMaxLoc function, generated using Vivado HLS 2017.1 tool for the Xilinx Xczu9eg-ffvb1156-1-i-es1 FPGA, to process a grayscale HD (1080x1920) image.

Table 2. xFminMaxLoc Function Resource Utilization Summary
Operating Mode

Operating Frequency (MHz)

 Utilization Estimate
BRAM_18K DSP_48Es FF LUT CLB
1 pixel 300 0 3 451 398 86
8 pixel 150 0 3 1049 1025 220

Performance Estimate

The following table summarizes the performance in different configurations, as generated using Vivado HLS 2017.1 tool for the Xilinx Xczu9eg-ffvb1156-1-i-es1, to process a grayscale HD (1080x1920) image.

Table 3. xFminMaxLoc Function Performance Estimate Summary
Operating Mode Latency Estimate
Max Latency
1 pixel operation (300 MHz) 6.9 ms
8 pixel operation (150 MHz) 1.69 ms