Calibrating Detachable Lens Image Stabilization
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Solution Overview
Problem
Image capture devices with detachable lenses experience image distortion due to optical center shifts, which are not accounted for by image stabilization algorithms, leading to 'wobble' in images when the device is moved.
Innovation Solution
A method to calibrate the image capture device by capturing images in multiple orientations of the detachable lens, determining the average image circle center, and providing this information to the image stabilization algorithm to correct for optical center shifts, ensuring accurate image stabilization regardless of lens orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a detachable lens is mounted on the image capture device, then the field of view is widened, but the optical center shifts causing image distortion and wobble
Solution Approach 1:
The patent performs preliminary calibration by capturing images in multiple orientations (0度和180度) before actual use. The optical center is pre-determined and stored in the device memory, allowing the image stabilization algorithm to compensate for the optical center shift caused by the detachable lens mounting, thereby eliminating wobble while maintaining the widened field of view
2Stability of the object's composition
If image stabilization is performed with a detachable lens mounted, then image stabilization is achieved, but distortion remains due to unaccounted optical center shift
Solution Approach 1:
The patent implements feedback by capturing images in multiple orientations and using the difference in image circle centers to calculate the optical center shift. This calculated shift is then fed back to the image stabilization algorithm, which adjusts its processing to compensate for the distortion, achieving both stabilization and accuracy
Data Source
AI summary
In a method, it is determined that a detachable lens is mounted on an image capture device in a first orientation. A first image of a controlled scene is captured with the detachable lens mounted in the first orientation. It is determined that the detachable lens is mounted on the image capture device in a second orientation that is rotated approximately 180 degrees from the first orientation. A second image of the controlled scene is captured with the detachable lens in the second orientation. A first image circle center of the first image is determined. A second image circle center of the second image is determined. An average image circle center is determined, based on the first image circle center and the second image circle center. The average image circle center is provided to an image stabilization algorithm when the detachable lens is mounted on the image capture device.