Method for obtaing optical projection parameter of camera

A camera and optical technology, which is applied in the direction of optical instrument testing, testing optical performance, testing of machine/structural components, etc. It can solve the problem of not accurately determining the camera parameters of the fisheye lens, unable to consider the accuracy of corrected images, and small viewing angles, etc. question

Inactive Publication Date: 2003-04-23
APPRO TECH
View PDF11 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Usually the general optical lens is used for imaging, and most of them hope that it conforms to the imaging result of linear projection. The image captured by the user under similar lens will be very close to the real world, but it has a shortcoming - the angle of view is small, and the standard lens is used as the For example, the angle of view is about 45 degrees to 55 degrees. Therefore, in fields that require a large angle of view, such as monitors or endoscopes, wide-angle lenses or fisheye lenses are used instead, so that images with a large angle of view can be captured at one time.
However, no matter which of the above-mentioned technical contents, they all us

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
  • Method for obtaing optical projection parameter of camera
  • Method for obtaing optical projection parameter of camera
  • Method for obtaing optical projection parameter of camera

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030]Although the image projected by a lens with axisymmetric nonlinear distortion such as a fisheye lens has serious distortion problems, its distortion phenomenon has the following characteristics: its image is center-symmetric on the focal plane, and this center point is called distortion Center, the optical projection light path in space is symmetrical to its optical axis, which is a phenomenon well known to those skilled in the art. The present invention first uses this phenomenon to determine the optical axis of the fisheye lens, and then uses the optical axis The axis is used as a reference to find the projection center of the fisheye lens camera, and its focal length can be calculated and its projection mode can be summarized.

[0031] Please refer to Fig. 2, a calibration object (calibration target) 22 must be utilized in order to realize the method of the present invention, and there must be at least one geometric figure on the calibration object 22, if there are mul...

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 method for obtaining optical projection parameter of camera includes the following steps: utilizing the characteristics of scrambed image which has centrosymmetry, using a correcting article withseveral symmetrical and concentric geometrical figures to define the optical axis of camera lens, and further find out its projection centre point on the optical axis by using error testing method, at the same time solving its equivalent focusing and projection mode. Said invention is simple, can accurately define internal and external parameters of camera, so that it has extensive application range.

Description

technical field [0001] The present invention relates to a method for digital image processing and presentation, and in particular to a method for recovering distorted images by finding the optical projection parameters such as the projection center (viewpoint) and equivalent focal length (focal length) of the camera lens. Method for normal perspective images. Background technique [0002] Usually the general optical lens is used for imaging, and most of them hope that it conforms to the imaging result of linear projection. The image captured by the user under a similar lens will be very close to the real world, but it has a shortcoming—the angle of view is small, and the standard lens is used as the For example, the angle of view is about 45 degrees to 55 degrees. Therefore, in fields that require a large angle of view, such as monitors or endoscopes, wide-angle lenses or fisheye lenses are used instead, so that images with a large angle of view can be captured at one time. ...

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): G01M11/00G01M11/02
Inventor 詹国祯张创然
Owner APPRO TECH
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