Lens Aperture Correction Data Interpolation
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Solution Overview
Problem
Existing camera systems face challenges in maintaining consistent peripheral light amounts due to variations in optical system operations, leading to overcorrection or undercorrection in image processing.
Innovation Solution
A lens apparatus that employs a processor to generate correction data using an n-th order expression with respect to image height, allowing for precise light amount compensation by interpolating correction data based on detected states of the lens apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If correction data is stored densely for all iris states, then light amount correction accuracy is improved, but data size and communication burden increase
Solution Approach 1:
The patent segments the correction data into two parts: discrete correction data stored for specific iris states, and continuous correction data calculated through interpolation for intermediate iris states. This segmentation allows the system to store minimal discrete data points while achieving continuous correction coverage, resolving the contradiction between correction accuracy and data size.
Solution Approach 2:
The patent introduces interpolation processing as an intermediary mechanism that generates continuous correction data from discrete stored data points. This intermediary approach enables accurate light amount correction for any iris state without storing data for every possible iris state, thereby reducing data size while maintaining correction accuracy.
2Quantity of substance
If discrete correction data is used for finite iris states, then data size is reduced, but interpolation errors cause overcorrection or undercorrection
Solution Approach 1:
The patent implements dynamic correction data generation through interpolation processing that adapts to the current iris state. Rather than using fixed discrete correction values, the system dynamically calculates appropriate correction data based on the detected iris state, ensuring accurate correction even for intermediate states where discrete data points are not available.
Solution Approach 2:
The patent changes the parameter representation from fixed discrete correction values to continuous correction values generated through interpolation. This parameter transformation allows the system to maintain correction accuracy across the entire iris state range while storing only minimal discrete data points, effectively resolving the contradiction between data size and correction accuracy.
Data Source
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AI summary
Provided is a lens apparatus including an aperture stop, configured to form an image via the aperture stop and detachably mountable to a camera apparatus. The lens apparatus includes: a storage storing correction data for correcting image data obtained by image pickup by the camera apparatus, with respect to a light amount distribution in the image; and a communication device configured to transmit the correction data to an external apparatus. The correction data includes a coefficient of an n-th order polynomial (n is a non-negative integer) with respect to an image height, which corresponds to each of a plurality of states of the aperture stop. Minimum F-numbers at a wide angle end a telephoto end, focal lengths at the wide angle end and at the telephoto end, and F-numbers corresponding to the correction data are appropriately set.