Camera Lens Distortion Correction via Automated Calibration
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Solution Overview
Problem
Existing image correction methods for camera lens distortion are time-consuming and unsuitable for real-time video signals, requiring precise manufacturing of cameras and pre-determined calibration tables that may not work across different camera models, leading to potential further distortion.
Innovation Solution
An image capture device with an image processor that captures a calibration image of a test pattern, analyzes it to generate a calibration data table, and uses this table to correct distortions in the raw video signal, allowing for real-time distortion correction specific to each camera.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual distortion correction is applied, then distortion correction accuracy is improved, but processing time increases making it unsuitable for real-time video
Solution Approach 1:
The patent applies preliminary action by pre-calculating distortion correction parameters through automated calibration before real-time video processing. The system captures calibration images, detects feature points, and computes distortion coefficients in advance, storing them for rapid application during real-time video correction without recalculation.
Solution Approach 2:
The patent uses copying by creating a calibration data table that stores pre-computed distortion correction parameters. This table is generated from calibration images and then copied/applied to correct multiple video frames, avoiding repeated manual correction processes while maintaining accuracy.
2Device complexity
If pre-determined calibration tables are used for entire camera families, then device complexity is reduced, but manufacturing precision requirements increase to ensure similar distortion characteristics
Solution Approach 1:
The patent applies self-service by enabling each camera to perform its own automated calibration through capturing images of a test pattern and processing them through distortion detection algorithms. This eliminates the need for complex centralized calibration systems and reduces manufacturing precision requirements since each camera is calibrated individually based on its actual distortion characteristics.
Solution Approach 2:
The patent uses parameter changes by automatically detecting and measuring the actual distortion parameters of each camera through image analysis. The system adjusts calibration parameters based on measured distortion coefficients rather than assuming uniform distortion across camera families, allowing broader manufacturing tolerances.
3Ease of operation
If pre-determined calibration tables are used, then ease of operation is improved, but adaptability decreases when camera models or conditions change
Solution Approach 1:
The patent applies dynamics by making the calibration system adaptive and reconfigurable. The automated calibration process can be executed when needed to generate updated calibration data tables that adapt to different camera models, lenses, or environmental conditions, rather than relying on fixed static calibration tables.
Solution Approach 2:
The patent combines preliminary action with adaptability by allowing calibration to be performed in advance for different camera configurations and storing multiple calibration data tables. The system can select and apply the appropriate calibration table based on the specific camera model or conditions, maintaining ease of operation while achieving adaptability.
4Adaptability or versatility
If automated calibration is implemented for each camera, then adaptability to individual camera characteristics is improved, but manufacturing cost increases due to additional calibration processes
Solution Approach 1:
The patent replaces complex mechanical calibration equipment and manual adjustment processes with automated image-based calibration. The system uses standard imaging equipment to capture test patterns and applies computational algorithms to determine distortion parameters, significantly reducing manufacturing costs while enabling individual camera calibration.
Solution Approach 2:
The patent uses copying by creating digital calibration data tables from captured images rather than requiring physical adjustment of camera components. This digital calibration approach is cost-effective and can be automated, making individual camera calibration economically viable during manufacturing.
Data Source
AI summary
A method and apparatus for providing a distortion corrected video signal. A camera is directed toward a test pattern for producing a raw video signal. An image processor is operatively connected to the camera for receiving the raw video signal. The image processor is operable to capture at least one calibration image of the test pattern using the raw video signal from the camera, analyze the at least one calibration image to provide a calibration data table, and store the calibration data table within the image processor.