Fisheye image correction method based on changed long axis ellipse fitting

A fisheye image and ellipse fitting technology, applied in image enhancement, image data processing, instruments, etc., can solve the problems of insufficient real-time performance, insufficient, excessive correction and correction, etc., and achieve the effect of simple algorithm, easy transplantation, and strong real-time performance.

Active Publication Date: 2014-08-20
NORTHEASTERN UNIV
View PDF6 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, optimization algorithms such as neural networks have the problems of complex algorithms and insufficient real-time performance, making it difficult to transplant embedded devices and mobile devices
Moreover, since the optimization algorithm is a black-box mode

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
  • Fisheye image correction method based on changed long axis ellipse fitting
  • Fisheye image correction method based on changed long axis ellipse fitting
  • Fisheye image correction method based on changed long axis ellipse fitting

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] The software environment of this embodiment is the WINDOWS7 system, the simulation environment is MATLAB R2014a, and the processor is the second generation Core i5-2410.

[0026] The fisheye image correction method based on the variable-length axis ellipse fitting of this embodiment, such as figure 1 As shown, including the following steps:

[0027] Step 1. Convert the color fisheye image into a grayscale fisheye image.

[0028] Due to the large amount of information in the color image and the inconspicuous gray-scale features, it increases the processing burden of the algorithm. In this embodiment, the color fish-eye image is converted into a gray-scale fish-eye image with the gray-scale conversion function of MATLAB R2014a system, and the gray-scale image pixels are 640 ×480.

[0029] Step 2. Use the global average value of the grayscale fis...

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 provides a fisheye image correction method based on changed long axis ellipse fitting. A changed long axis ellipse fitting correction model is built, the model is based on a longitude and latitude mapping correction algorithm, a longitude long axis parameter and a latitude long axis parameter are adjusted at the same time, and a finial changed long axis ellipse fitting correction model is obtained; according to coordinates of pixels of a fisheye image, through the changed long axis ellipse fitting correction model, corresponding pixel coordinates of the fisheye image under pixel coordinates are obtained, and a fisheye correction image is obtained. The mapping conditions of the pixels are recorded in the full correction process through a table mapping method, and the final correction image is obtained. The fisheye image correction method based on changed long axis ellipse fitting has the advantages of being simple in algorithm and high in real-time performance, and enables the transplanting of an embedded type device and a mobile device to be easy.

Description

technical field [0001] The invention relates to the technical field of machine vision, in particular to a fisheye image correction method based on variable length ellipse fitting. Background technique [0002] The fisheye lens is a kind of super wide-angle lens. In order to achieve the maximum viewing angle of the lens, the diameter of the front lens of the lens is very short and protrudes toward the front of the lens in a parabolic shape. The fisheye lens has a short focal length and a large viewing angle, and there is a geometric optical error between its imaging point and the ideal imaging point, also known as distortion. In the actual optical imaging system of camera and lens combination, the causes of distortion are mainly divided into two categories: radial distortion and eccentric distortion. Radial distortion refers to the change of radial curvature that causes the actual imaging point to deviate radially from the ideal imaging point. The farther the deformation is ...

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): G06T5/00G06K9/38
Inventor 朱德龙张云洲钟惟林廖峭
Owner NORTHEASTERN 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