Multi-Camera Depth Correction via Lens Offset Compensation
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Solution Overview
Problem
Existing image acquisition devices with multiple camera modules face inaccuracies and low speed in focusing due to differing focal lengths, leading to inconsistent lens offsets during optical image stabilization, which affects the accuracy of depth information obtained.
Innovation Solution
A method and apparatus that corrects the initial distance between images from multiple camera modules by calculating and applying offset differences, ensuring accurate depth information and quick focusing by using the corrected distance in a depth calculation formula.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple camera modules are used to improve image quality, then image shooting quality is improved, but depth information accuracy deteriorates due to different focal lengths causing inconsistent lens offsets during OIS
Solution Approach 1:
The patent changes the parameter of distance measurement by introducing offset correction. Instead of directly using the raw distance between shooting objects in two images, the system calculates and applies offset values to correct for lens position differences caused by OIS, thereby maintaining depth information accuracy despite using multiple camera modules with different focal lengths
Solution Approach 2:
The patent implements a feedback mechanism by calculating offset values based on lens positions and using these offsets to correct distance measurements. The system continuously monitors lens positions during OIS and applies real-time corrections to maintain accurate depth information, creating a closed-loop control system
2Reliability
If OIS is implemented by moving lenses in multiple camera modules, then image stabilization is improved, but depth information accuracy deteriorates due to inconsistent lens offsets
Solution Approach 1:
The system uses feedback by monitoring lens positions during OIS and applying offset corrections based on these positions. The offset calculation depends on the actual lens displacement, creating a feedback loop that maintains depth accuracy despite lens movement for stabilization
Solution Approach 2:
The patent dynamically changes the distance measurement parameter by applying offset corrections that are calculated based on lens positions. This allows the system to adapt the distance measurement to account for OIS-induced lens displacements, maintaining accuracy while enabling stabilization
3Manufacturing precision
If focal lengths of lenses in multiple camera modules are made slightly different, then image quality is improved, but focusing speed and accuracy deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-calculating or pre-determining offset values that will be needed for correction. By having offset calculation mechanisms in place before depth measurement is required, the system can quickly apply corrections without adding significant processing time to the focusing operation
Solution Approach 2:
The system efficiently changes the distance measurement parameter by using offset corrections that can be quickly calculated and applied. This allows the patent to maintain accurate depth measurements despite different focal lengths, enabling fast and accurate focusing
Data Source
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AI summary
Embodiments of the present invention disclose a depth information obtaining method and apparatus, and an image acquisition device. The image acquisition device includes a first camera and a second camera. When detecting that shaking occurs, the depth information obtaining apparatus may obtain images captured by the first camera and the second camera, detect an initial distance between a target shooting object in the two images, correct the initial distance by using an offset difference between a first image and a second image, and determine a depth of the target shooting object by using the corrected initial distance. In the embodiments of the present invention, the two cameras may both have an OIS function, or either of the cameras has an OIS function. When performing OIS, the depth information obtaining apparatus corrects the distance between the same shooting object in the images obtained by the two cameras, so that finally obtained depth information is relatively accurate. This can accurately and quickly implement focusing on the shooting object.