The sum function calculates the sum of all pixels in input image.
API Syntax
template< int SRC_T , int ROWS, int COLS, int NPC=1, int XFCVDEPTH_IN = _XFCVDEPTH_DEFAULT>
void sum(xf::cv::Mat<SRC_T, ROWS, COLS, NPC, XFCVDEPTH_IN> & src1,double sum[XF_CHANNELS(SRC_T,NPC)])
Parameter Descriptions
The following table describes the template and the function parameters.
| 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 (must be multiple of 8). |
| NPC | Number of pixels to be processed per cycle. |
| XFCVDEPTH_IN | Depth of the input image. |
| _src1 | Input image. |
| sum | Array to store sum of all pixels in the image. |
Resource Utilization
The following table summarizes the resource utilization of the Sum 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.
| 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 | 341 | 408 |
| LUT | 304 | 338 |
| CLB | 71 | 87 |
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.
| Operating Mode | Latency Estimate |
|---|---|
| Max Latency (ms) | |
| 1 pixel operation (300 MHz) | |
| 8 pixel operation (150 MHz) |