Endoscopic Camera Calibration via Marker Detection and Image Quality Feedback
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Solution Overview
Problem
Endoscopic cameras are prone to image distortion, which can compromise the accuracy and precision of measurements during surgical procedures, highlighting the need for effective calibration techniques.
Innovation Solution
A system and method that guide users through a calibration process using a graphical user interface and a calibration fixture with a field of calibration markers, ensuring the capture of high-quality calibration images from multiple angles, and analyzing these images to determine their suitability for calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional calibration techniques are used to correct image distortion, then measurement accuracy is improved, but the calibration process becomes complex and time-consuming
Solution Approach 1:
The system performs self-calibration by automatically capturing images of calibration markers, detecting their positions, and computing distortion correction parameters without requiring manual intervention or complex user操作流程, thus maintaining high measurement accuracy while simplifying the calibration process
Solution Approach 2:
The patent replaces manual mechanical calibration operations with an automated computational system that uses image processing algorithms to detect calibration markers and calculate distortion parameters, eliminating the need for complex manual adjustment mechanisms
2Measurement precision
If multiple calibration images are captured from different angles to improve calibration quality, then distortion correction accuracy is enhanced, but the calibration time increases
Solution Approach 1:
The system pre-positions calibration markers in a fixed geometric arrangement and pre-defines multiple capture angles, allowing the camera to automatically sequence through different viewing angles without real-time decision-making, thus capturing comprehensive calibration data efficiently
Solution Approach 2:
The calibration process dynamically adjusts the number of images captured based on detected image quality and marker visibility, capturing additional angles only when necessary to achieve sufficient calibration accuracy, thereby optimizing the balance between calibration quality and time consumption
3Reliability
If automated image analysis is implemented to assess calibration image suitability, then calibration quality is improved, but processing complexity increases
Solution Approach 1:
The system implements automated feedback mechanisms that analyze captured calibration images for quality metrics such as marker detection success, image sharpness, and geometric accuracy, automatically determining whether additional images are needed and when calibration can proceed, thus ensuring high calibration quality through systematic quality control
Solution Approach 2:
The image analysis system performs self-assessment of calibration image quality using automated algorithms that evaluate marker detection confidence, geometric consistency, and image clarity, eliminating the need for manual image review while maintaining high calibration standards
Data Source
AI summary
A method includes displaying visual guidance for guiding a user through an endoscopic camera calibration process. The visual guidance guides the user to direct an endoscopic camera at a plurality of different regions of a field of calibration markers. Images captured by the endoscopic camera while the user directs the endoscopic camera at the calibration markers are received. Suitability of images for use in calibration for the endoscopic camera is determined. In accordance with determining that at least one image is suitable for use in calibration, the visual guidance is updated to indicate to the user that the respective region of the plurality of different regions of the field of calibration markers has been successfully imaged. Calibration factors for calibrating the endoscopic camera are determined based on images determined to be suitable for use in calibration for the endoscopic camera.