Zero - 2024.1 English

Vitis Libraries

Release Date
2024.1 English

The Zero function sets the each pixel in input image to zero and stores the result in dst.

API Syntax

void zero(xf::cv::Mat<SRC_T, ROWS, COLS, NPC, XFCVDEPTH_IN_1> & _src1,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 773 Table . Zero 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 Depth of the input image.
XFCVDEPTH_OUT Depth of the output image.
_src1 Input image
_dst Output image

Resource Utilization

The following table summarizes the resource utilization of the Zero 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 774 Table . Zero 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 78 78
LUT 42 41
CLB 15 14

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 775 Table . Zero 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

1 N. Dalal, B. Triggs: Histograms of oriented gradients for human detection, IEEE Computer Society Conference on Computer Vision and Pattern Recognition, 2005.