Light Field Camera Sub-Lens Refocusing Accuracy Control
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Solution Overview
Problem
Conventional light field cameras capture refocusing images with uniform accuracy across different regions of a scene, failing to meet user demands for varying refocusing accuracy based on the importance of specific zones, such as prioritizing a person's face over scenery.
Innovation Solution
A method and apparatus for controlling light field capture by determining the refocusing accuracy of specific sub-lenses in a light field camera, adjusting their parameters to achieve differentiated refocusing accuracy across different regions, allowing for higher accuracy in areas of greater importance, such as a person's face, while maintaining uniform depth range of refocusing point adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If uniform refocusing accuracy is applied across all regions of a light field camera, then the refocusing accuracy of less important regions (e.g., scenery) is maintained, but the refocusing accuracy of important regions (e.g., person's face) cannot be prioritized
Solution Approach 1:
The patent applies local quality by dividing the light field camera into multiple regions with different refocusing accuracy requirements. Specifically, the scene is divided into a first region (e.g., person's face) requiring high refocusing accuracy and a second region (e.g., scenery) with lower requirements. Different sub-lenses are assigned to capture different regions, and capture parameters such as aperture and exposure time are adjusted locally for each region to achieve differentiated refocusing accuracy.
2Measurement precision
If capture parameters are adjusted for specific sub-lenses to improve refocusing accuracy, then the refocusing accuracy of targeted regions is improved, but the complexity of parameter control increases
Solution Approach 1:
The patent applies segmentation by dividing the light field camera into multiple independent sub-lenses, each responsible for capturing a specific region of the scene. Each sub-lens can have its capture parameters (aperture, exposure time, etc.) independently adjusted based on the refocusing accuracy requirements of its corresponding region. This segmentation allows complex parameter control to be distributed and managed at the sub-lens level rather than requiring centralized complex control.
3Measurement precision
If more sub-lenses are used to capture important regions with higher accuracy, then the refocusing accuracy is improved, but the device complexity and cost increase
Solution Approach 1:
The patent applies parameter changes by adjusting the capture parameters (aperture size, exposure time, focal length) of existing sub-lenses rather than simply adding more sub-lenses. By optimizing these parameters for sub-lenses capturing important regions, the system achieves higher refocusing accuracy for those regions while utilizing the existing sub-lens array structure, thus avoiding the need to increase the number of sub-lenses and the associated device complexity.
Data Source
AI summary
Embodiments of the present application disclose various methods and an apparatus for controlling light field capture. One method for controlling light field capture comprises: determining, at least according to at least one sub-lens that affects imaging of a first region in a sub-lens array of a light field camera, at least one first sub-lens to be adjusted, the first region being a part of a scene to be shot; determining an object refocusing accuracy of a light field image section captured by the first sub-lens in a light field image of the scene to be shot; adjusting, according to the object refocusing accuracy, a light field capture parameter of the first sub-lens; and performing, based on the light field camera after being adjusted, light field capture on the scene to be shot. The solution can achieve differentiated distribution of refocusing accuracies of various light field image sections that correspond to different regions of the scene to be shot, thereby better satisfying a user's actual application demands.