Extrinsic Camera Calibration with Light-Emitting Reference Points
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Solution Overview
Problem
Existing electronic devices with multiple cameras face issues in maintaining accurate extrinsic calibration parameters due to potential displacement or insufficient feature points in the user environment, leading to inaccurate data alignment and reduced user experience.
Innovation Solution
An extrinsic calibration parameter generating device and method that utilizes at least two image capturing devices to generate five- and six-degree-of-freedom calibration parameters by analyzing light-emitting points in image frames, allowing for efficient calibration without additional assistance devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If extrinsic parameter calibration is performed by photographing feature points in the user environment, then calibration can be conducted during actual use, but the calibration accuracy deteriorates when feature points are insufficient or blocked in the environment
Solution Approach 1:
The patent introduces an external device with light-emitting points as an intermediary calibration tool. Instead of relying on feature points in the user environment, the system uses a dedicated calibration device that emits visible light points, ensuring sufficient and unobstructed feature points for accurate feature pairing and extrinsic parameter calculation regardless of the surrounding environment
Solution Approach 2:
The patent creates a virtual copy of the calibration target by projecting light-emitting points from the external device into the camera's field of view. These virtual light points serve as reliable feature points that can be detected and paired across multiple camera views, enabling accurate calibration without depending on physical feature points in the real environment
2Adaptability or versatility
If multiple cameras are equipped for pose tracking operations, then tracking functionality is enhanced, but the system complexity increases due to the need for extrinsic parameter calibration
Solution Approach 1:
The external device with light-emitting points serves multiple functions: it acts as both a calibration target and a tracking reference. The same device can be used for different calibration scenarios and can provide continuous reference points for both extrinsic parameter calibration and ongoing pose tracking operations, reducing the need for separate calibration equipment
Solution Approach 2:
The system enables self-calibration by using the external device that the user already holds during normal operation. The calibration process leverages the existing setup without requiring additional specialized calibration equipment or complex manual procedures, making the calibration process as simple as holding the device in the field of view
Data Source
AI summary
An extrinsic calibration parameter generating device, method, and non-transitory computer readable storage medium thereof are provided. The device calculates a base image capturing device pose based on the light-emitting points of a plurality of image frames. The device generates a first extrinsic calibration parameter corresponding to at least two image capturing devices based on the image frames, and the first extrinsic calibration parameter is a five-degree-of-freedom information. The device generates a second extrinsic calibration parameter corresponding to the at least two image capturing devices based on the base image capturing device pose and the first extrinsic calibration parameter, and the second extrinsic calibration parameter is six-degree-of-freedom information.