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Method of Camera Calibration Using Two Same Circles

A camera calibration and camera technology, applied in the field of autonomous navigation system and camera calibration

Inactive Publication Date: 2011-12-14
NANTONG YIXUAN IND DESIGN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing methods either assume that part of the internal parameter information is known, or must use other geometric aids such as straight lines to simultaneously determine the internal and external parameters of the camera.

Method used

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  • Method of Camera Calibration Using Two Same Circles
  • Method of Camera Calibration Using Two Same Circles
  • Method of Camera Calibration Using Two Same Circles

Examples

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Embodiment Construction

[0047] In order to better understand the present invention, the specific embodiment of the present invention will be further described below in conjunction with the accompanying drawings, and the flow chart of the specific steps is as follows figure 1 As shown, the specific steps of applying this method for camera calibration are as follows:

[0048] Step 1: First formulate the calibrator. Draw two identical circles arbitrarily on a flat object or place two identical circular objects arbitrarily, and note that two identical circles cannot be tangent. Take these two non-tangent identical circles as calibration objects.

[0049] Step 2: Place the calibration object flatly within the field of view of the camera, use the camera to shoot the calibration object from three different angles, and obtain three images of the calibration object with two elliptical images respectively to ensure clear imaging.

[0050] Step 3: Perform the following operations on each calibration object im...

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Abstract

The invention relates to a method for camera calibration using two identical circles, using two non-tangent identical circles as calibration objects, using a camera to photograph the calibration objects from three different angles to obtain three clear images, and determining each The equations of the two elliptical images in the figure, and find the coordinates of a pair of circular point images in each figure. The internal parameters of the camera are determined by using the coordinates of the circular point images of the three images and the projection equation of the absolute conic curve. For each image, find the inner and outer common tangents of two ellipse images; recover and correct the angle between the inner and outer common tangents of two identical circles in the world coordinate system; according to the established world coordinates of the inner and outer common tangents of two identical circles and its projected image coordinates to obtain the external parameters of the camera. The invention can obtain the internal and external parameters of the camera simply and accurately, and can realize automatic calibration. The invention can be widely used in non-contact industrial detection and vision-based autonomous navigation systems.

Description

technical field [0001] The invention relates to a camera calibration method using two identical circles, which can accurately obtain the internal parameters and external parameters of the camera under the condition that all camera parameters are unknown. The invention belongs to the field of advanced measurement technology, and is especially suitable for camera calibration in computer stereo vision, non-contact industrial detection and vision-based autonomous navigation system. Background technique [0002] Camera calibration is the basis of computer vision, and it is widely used in computer vision, virtual reality and other computer image applications. Its main goal is to find the internal and external parameters of the camera. Calibration methods based on circular markers are widely used due to their easy acquisition, insensitivity to threshold segmentation, occlusion, and sub-pixel positioning accuracy. The literature (HEIKKILA J. "Geometric camera calibration using circ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N17/00G06T7/00
Inventor 达飞鹏张虎
Owner NANTONG YIXUAN IND DESIGN CO LTD
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