Lens Profile Retargeting for Cross-Model Aberration Correction
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Solution Overview
Problem
Existing camera lens profiles often fail to accurately correct aberrations in images captured with different camera settings or models, as they are typically generated from a specific reference camera model and settings, and may not account for variations in sensor size or orientation.
Innovation Solution
The method involves retargeting and prioritized interpolation of lens profiles, which allows for the application of aberration correction models generated for one camera model to images captured with a different camera model or settings by scaling and interpolating sub-profiles based on focal length, focus distance, and aperture, ensuring accurate correction of geometric distortion, lateral chromatic aberration, and vignette.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If lens profiles are generated from a specific reference camera model and settings, then the correction accuracy for that specific model is improved, but the applicability to different camera models and settings deteriorates
Solution Approach 1:
The patent applies parameter changes by systematically varying camera settings (focal length, aperture, focus distance) to generate multiple lens sub-profiles from a single reference camera model. These profiles capture how lens aberrations change with different parameters, enabling the system to select and interpolate appropriate profiles for target images captured with different settings or models.
Solution Approach 2:
The patent achieves universality by creating a multi-functional lens profile system where a single reference camera model generates profiles that can be applied to multiple target camera models and settings. The interpolation mechanism allows the same set of sub-profiles to serve various correction needs across different shooting conditions.
2Measurement precision
If lens profiles are created for specific camera settings, then the correction precision for those settings is improved, but the complexity of managing multiple profiles increases
Solution Approach 1:
The patent segments the lens correction task into multiple sub-profiles, each optimized for specific camera settings (focal length, aperture, focus distance). Instead of managing one complex profile for all settings, the system divides the correction space into manageable segments that can be independently generated and interpolated.
Solution Approach 2:
The patent introduces dynamics by implementing an interpolation mechanism that dynamically selects and combines appropriate sub-profiles based on the actual camera settings of the target image. This dynamic approach replaces static profile management with adaptive profile selection and blending.
3Adaptability or versatility
If lens profiles account for sensor size variations, then the adaptability to different camera models is improved, but the difficulty of detecting and measuring appropriate parameters increases
Solution Approach 1:
The patent uses parameter changes to systematically account for sensor size variations by generating sub-profiles at different focal lengths and other relevant parameters. This creates a comprehensive set of profiles that inherently cover various sensor size scenarios, making the system adaptable without requiring complex real-time sensor size detection.
Data Source
AI summary
Methods and apparatus for retargeting and prioritized interpolation of lens profiles. A lens profile file may include a set of lens sub-profiles. The camera body and/or settings described in the file may not exactly match that of camera body and/or settings used to capture a target image. A sub-profile processing module may perform a prioritized sub-profile sorting and interpolation method to generate an interpolated sub-profile that may be applied to the target image to correct aberrations including, but not limited to, geometric distortion, lateral chromatic aberration, and vignette. Thus, models generated for a reference camera at a variety of settings may be applied to a target image captured with the same type of lens but with a different camera and/or with different settings that are not exactly modeled in the lens profile file.