Multi-stripe noise positioning and filtering method

A stripe noise and filtering technology, applied in image data processing, instruments, calculations, etc., to achieve the effect of thorough stripe filtering, accurate positioning, and solving the inability to locate the frequency of small amplitude stripe noise.

Inactive Publication Date: 2014-03-26
HARBIN ENG UNIV
View PDF3 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods work well for single periodic noise and horizontal or vertical stripe noise, but for non-single, non-horizontal and non-vertical noise stripes, only the periodic stripe noise with relatively large spectral amplitude can be removed, and the remaining non- Periodic noise and noise with relatively small spectral amplitude are powerless

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multi-stripe noise positioning and filtering method
  • Multi-stripe noise positioning and filtering method
  • Multi-stripe noise positioning and filtering method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0083] The present invention will be further described below in conjunction with accompanying drawing:

[0084] Concrete implementation steps of the present invention are as follows:

[0085] Step 1: Image Transformation

[0086] Perform a 2D Fourier transform on the hologram and move the zero frequency point to the center and take its magnitude. Suppose the hologram to be processed is I, and its size is M×N. The amplitude calculation formula is as follows:

[0087] f I =fftshift(fft2(I)) (1)

[0088] f Ia =abs(F I ) (2)

[0089] Among them, fft2() is the fast two-dimensional Fourier transform, fftshift() is the function of shifting the zero frequency to the center, and abs() is the frequency domain amplitude extraction function of the hologram I.

[0090] Step Two: Partition

[0091] Because the energy of the zero frequency point and its vicinity is extremely large, it seriously affects the selection of the threshold value, resulting in the failure of finding the n...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the field of noise filtering and particularly relates to a method of using frequency domain local threshold method to position frequency and then using a Gauss notch filter to carry out filtering to realize the positioning and filtering of the multi-stripe noise. The multi-stripe noise positioning and filtering method comprises the steps of (1) image transformation, (2) partition, (3) the setting of a partition threshold, (4) stripe noise frequency point positioning, and (5) filtering. The invention provides a stripe noise frequency positioning and filtering method, multiple types of stripe noise frequency can be positioned, the positioning is accurate, and the filtering of stripes is more thorough. According to the method, the local threshold method is used to determine the position of noise frequency, various complex stripe noise frequency can be positioned, thus a problem that small amplitude stripe noise frequency can not be positioned caused by the influence of energy distribution is solved.

Description

technical field [0001] The invention belongs to the field of noise filtering, and in particular relates to a method for locating the frequency by using a local threshold method in the frequency domain, and then filtering it with a Gaussian notch filter to realize the positioning and filtering method for multi-stripe noise. Background technique [0002] The holographic camera system (HoloCam) is used to analyze and detect the quantity and distribution of marine organisms and inorganic particles around the world. Compared with ordinary camera systems, it can non-intrusively and non-destructively photograph marine organisms and inorganic particles in a natural state, and obtain high-resolution three-dimensional images. However, due to the structure of the holographic camera system itself and the external environment (such as water turbidity, etc.), the captured hologram often has streak noise, which seriously affects the quality of the reconstructed image and further processing...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 汤春明刘玉翠陈立伟廖艳萍关乐禾
Owner HARBIN ENG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap