Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Quick method for picking up stepped edge in sub pixel level

A seed pixel and extraction method technology, applied in image analysis, image data processing, instruments, etc., can solve the problems of slow image processing speed, not suitable for machine vision and related image processing fast real-time requirements, cumbersome calculations, etc., to achieve extraction speed Fast, high precision, simple selection of initial value

Inactive Publication Date: 2006-07-05
BEIHANG UNIV
View PDF0 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common disadvantages of these two types of methods are that the calculation is cumbersome and the image processing speed is slow, which is not suitable for the fast real-time requirements of machine vision and related image processing.

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
  • Quick method for picking up stepped edge in sub pixel level
  • Quick method for picking up stepped edge in sub pixel level
  • Quick method for picking up stepped edge in sub pixel level

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] The present invention will be described in further detail below.

[0026] The step edge contour model function such as figure 1 . According to the step edge shape, the step edge profile model can be defined as:

[0027] y = - a 1 + e x - b σ + c - - - [ 1 ]

[0028] Among them, a, b, and c are position parameters, and σ represents the variance. The geometric meaning of the three parameters is: a represents the height of the edge, that is, the difference between the maximum and minimum steady-state values ​​of the curve; b represents the abscissa of the symmetrical center position of the edge; c represents the base value of the edg...

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 machine vision and related image processing techniques, relating to the improvement of an image edge extracting method. The steps of the invention: making smooth filtering processing on the original image; searching a boundary point Ps with steady-state grey scale maximum value and a boundary point Pe with steady-stage grey scale minimum value of a step edge; calculating initial values a0ú¼b0 and c0 of edge model parameters; calculating the optimum values of aú¼b and c and determining the step edge. The initial value selection of the model parameters is simple, and the step edge extraction has high speed, strong robustness and high accuracy.

Description

technical field [0001] The invention belongs to machine vision and related image processing technology, and relates to the improvement of image edge extraction method. Background technique [0002] The most basic feature of an image is the edge. The so-called edge refers to the set of pixels in the image that have a step change or a roof-like change in the pixel gray level. It is related to the discontinuity of the image brightness or the first derivative of the image brightness, thus appearing as step edges and line edges. The step edge shows that there is an obvious difference in the gray value of the pixels on both sides of the discontinuity in the brightness of the image. This difference is visually manifested as the transition of the image from a bright scene to a dark background, or from a bright background to a dark scene. . For machine vision and related image processing, pixel-level step edge extraction cannot meet the requirements. The accuracy of step edge extr...

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
IPC IPC(8): G06T7/60G06T7/13G06T7/181
Inventor 张广军贺俊吉魏振忠
Owner BEIHANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com