Bitwise NOT - 2023.2 English

The bitwise_not function performs the pixel wise bitwise NOT operation for the pixels in the input image, and returns an output image.

Where,

is the intensity of output image at (x, y) position
is the intensity of input image at (x, y) position

API Syntax

template<int SRC_T, int ROWS, int COLS, int NPC=1, int XFCVDEPTH_IN_1 = _XFCVDEPTH_DEFAULT, int XFCVDEPTH_OUT_1 = _XFCVDEPTH_DEFAULT>
void bitwise_not (
xf::cv::Mat<SRC_T, ROWS, COLS, NPC, XFCVDEPTH_IN_1>& src,
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 313 Table 45. bitwise_not Parameter Description
Parameter	Description
SRC_T	Input and output pixel type. Supports 1 channel and 3 channels (XF_8UC1,XF_16SC1,XF_16SC3 and XF_8UC3)
ROWS	Maximum height of input and output image.
COLS	Maximum width of input and output image (must be a multiple of 8, for 8 pixel mode)
NPC	Number of pixels to be processed per cycle; possible options are XF_NPPC1,XF_NPPC2,XF_NPPC4 and XF_NPPC8 for 1,2,4 pixel and 8 pixel operations respectively.
XFCVDEPTH_IN_1	Depth of input image
XFCVDEPTH_OUT_1	Depth of output image
src	Input image
dst	Output image

Resource Utilization

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

Table 46. bitwise_not Function Resource Utilization Summary

Operating Mode Operating Frequency (MHz) Utilization Estimate

BRAM_18K DSP_48Es FF LUT CLB

1 Pixel 300 0 0 97 78 20

8 Pixel 150 0 0 88 97 21

Operating Mode	Operating Frequency (MHz)	Utilization Estimate
1 Pixel	300	0	0	97	78	20
8 Pixel	150	0	0	88	97	21

The following table summarizes the resource utilization in different configurations, generated using Vivado HLS 2019.1 tool for the Xczu9eg-ffvb1156-1-i-es1 FPGA, to process a 4K 3Channel image.

Table 314 Table 47. bitwise_not Function Resource Utilization Summary
Operating Mode	Operating Frequency (MHz)	Utilization Estimate
Operating Mode	Operating Frequency (MHz)	BRAM_18K	DSP_48Es	FF	LUT	CLB
1 Pixel	300	0	1	155	61	22

… rubric:: Performance Estimate

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

Table 315 Table 48. bitwise_not Function Performance Estimate Summary
Operating Mode	Latency Estimate
Operating Mode	Max Latency (ms)
1 pixel operation (300 MHz)	6.9
8 pixel operation (150 MHz)	1.7