Camera Intrinsic Parameter Verification Using Decoupled Reference Images
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Solution Overview
Problem
Existing camera intrinsic parameter calibration and verification methods lack independence between calibration and verification, leading to inaccurate verification when using the same method for calibration, especially when chessboard calibration methods result in larger errors.
Innovation Solution
A calibration verification method that decouples calibration and verification by using a preset photographing condition to obtain reference images with known world coordinates, determining first and second coordinate change parameters, and comparing them to verify successful calibration through a feedback mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If chessboard calibration method is used to verify camera intrinsic parameter, then verification process is simple, but verification accuracy is low due to large reprojection errors
Solution Approach 1:
The patent introduces a verification pattern as an intermediary object between the calibration process and verification. This verification pattern with known 3D coordinates and distinctive features serves as a mediator to objectively verify calibration accuracy without relying on the same chessboard method used for calibration, thereby resolving the contradiction between simple verification process and accurate verification results
Solution Approach 2:
The patent separates calibration and verification into independent stages. Calibration uses chessboard patterns while verification uses a separate verification pattern with different characteristics. This segmentation allows each stage to optimize for its specific purpose, improving overall verification accuracy without compromising operational simplicity
2Device complexity
If same method is used for both calibration and verification, then process is consistent and simple, but verification independence is lacking leading to inaccurate results
Solution Approach 1:
The patent divides the calibration system into two independent components: calibration module using chessboard patterns and verification module using verification patterns with known 3D coordinates. This segmentation ensures verification independence while maintaining overall process simplicity through standardized workflows for each module
Solution Approach 2:
The verification pattern acts as an independent intermediary that validates calibration results without being part of the calibration process itself. This intermediary approach ensures verification reliability by providing an objective reference that is separate from the calibration methodology
Data Source
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AI summary
Embodiments of the present disclosure relate to a calibration and verification method and apparatus for an intrinsic camera parameter, a device, and a medium. The method comprises: acquiring a plurality of reference images photographed by a target camera under the conditions of a plurality of reference world coordinates under a preset photographing condition, wherein the target camera calibrates an intrinsic camera parameter; determining, according to the preset photographing condition, a first coordinate change parameter corresponding to the plurality of reference world coordinates, and determining a second coordinate change parameter of the plurality of reference images according to a preset algorithm; determining whether the second coordinate change parameter is consistent with the first coordinate change parameter; and if the second coordinate change parameter is consistent with the first coordinate change parameter, feeding back a verification message that the intrinsic camera parameter is successfully calibrated. Therefore, the decoupling of calibration and verification of the intrinsic camera parameter improves the accuracy of the calibration and verification of the intrinsic camera parameter. Moreover, the automatic execution of the calibration and verification of the intrinsic camera parameter provides technical support for realizing the calibration efficiency of the intrinsic camera parameter.