Three-Sensor Camera Module Auto-Convergence Calibration
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Solution Overview
Problem
Conventional stereo camera systems face challenges in generating accurate depth images due to close camera spacing, leading to image loss and reduced reliability of depth information, which can cause user dizziness in 3D applications.
Innovation Solution
A camera module comprising three sensor units arranged in a row, with the second sensor unit spaced apart from the first at a predetermined distance, and the third sensor unit further apart, allowing for optical calibration of the convergence angle and simultaneous extraction of 3D images and depth information without image loss by moving the second sensor unit based on position differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional stereo camera systems use two image sensors spaced close together, then device complexity is reduced, but measurement precision of depth information deteriorates
Solution Approach 1:
The patent divides the imaging function into three separate sensor units: the first sensor unit captures images for 3D reconstruction, the second sensor unit captures images for depth extraction, and the third sensor unit provides additional spatial reference. This segmentation allows each sensor to be optimized for its specific function while maintaining overall system simplicity
Solution Approach 2:
The patent transitions from a 2D stereo imaging approach (two sensors) to a 3D spatial arrangement (three sensors arranged in a row at different positions). By adding the third sensor unit spaced apart from the second, the system gains an additional dimensional reference that improves depth measurement precision without significantly increasing device complexity
2Measurement precision
If conventional methods cut out images for convergence angle control, then convergence accuracy is improved, but loss of information increases
Solution Approach 1:
The system performs preliminary calibration by capturing calibration images with the second sensor unit at different positions before actual 3D imaging. The controller determines position differences and calculates convergence angles in advance, allowing the system to achieve accurate convergence control without needing to cut or discard subsequent image data
Solution Approach 2:
The second sensor unit serves as an intermediary calibration device that captures reference images used to determine convergence angles. By using these intermediate calibration images separately from the main 3D imaging sensors, the system achieves accurate convergence control while preserving all image data from the first and third sensor units for their intended purposes
3Measurement precision
If the second sensor unit is moved for calibration, then convergence angle accuracy is improved, but device complexity increases
Solution Approach 1:
The second sensor unit is designed to be movable relative to the first and third sensor units, allowing dynamic adjustment of its position for calibration purposes. The driving unit enables the second sensor unit to move to different positions where it can capture calibration images at known spatial relationships, improving convergence angle measurement without requiring complex permanent mechanical structures
Solution Approach 2:
The controller automatically determines position differences by comparing images from the first sensor unit with images from the second sensor unit at different positions. The system self-calibrates by using its own captured images to calculate convergence angles, eliminating the need for external calibration equipment or complex manual positioning mechanisms
Data Source
Figure 1A~1C
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Figure 4~5A
AI summary
A camera module and an apparatus for calibrating position of the camera module are provided, the camera module according to an exemplary embodiment of the present disclosure comprises a first sensor unit configured to obtain a first image; a second sensor unit configured to obtain a second image; and a third sensor unit configured to obtain a third image, wherein the second sensor unit is spaced apart from the first sensor unit at a predetermined distance, and the third sensor unit is spaced apart from the second sensor unit at a predetermined distance.