Interchangeable Lens Vignetting Data Storage and Transmission
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Solution Overview
Problem
Interchangeable lenses in camera systems require significant memory capacity to store optical characteristics like vignetting, and a limited number of data points compromise image processing accuracy.
Innovation Solution
An interchangeable lens with an optical characteristic storage unit that stores vignetting information at specific image heights and transmits this data to the camera body, using interpolation for missing data points, and a camera body that performs exposure and image processing calculations based on received vignetting information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of data points are stored for optical characteristics like vignetting, then image processing accuracy is improved, but memory capacity requirements increase
Solution Approach 1:
The photographic field is divided into multiple regions based on image height, with representative points selected at specific positions (e.g., 1/6, 2/6, 3/6, 4/6, 5/6 of the image height from the center to the corner). This segmentation allows the optical characteristics to be characterized at discrete locations rather than continuously across the entire field, reducing data points while maintaining processing accuracy.
Solution Approach 2:
The patent changes the parameter representation from storing continuous or dense vignetting data to storing discrete vignetting values at specific image height positions. By selecting key representative positions and storing only those values, the data quantity is reduced while the essential optical characteristic information is preserved for accurate image processing.
2Quantity of substance
If a small number of data points are stored for optical characteristics, then memory capacity requirements are reduced, but image processing accuracy decreases
Solution Approach 1:
The camera body performs preliminary actions by storing multiple sets of optical characteristic data corresponding to different interchangeable lens types in advance. When a lens is attached, the system quickly identifies the lens type and retrieves the pre-stored corresponding data, avoiding the need to store all possible lens data simultaneously while ensuring accurate image processing for each lens type.
Solution Approach 2:
The system changes the parameter approach by storing vignetting information at specific discrete image height positions (representative points) rather than continuous data. This parameter selection strategy reduces memory requirements while maintaining sufficient accuracy for image processing by capturing the essential variation of optical characteristics across the photographic field.
Data Source
AI summary
An interchangeable lens that can be fitted to and removed from a camera body, includes: an optical characteristic storage unit that stores information relating to optical characteristics of the interchangeable lens, including at least information related to vignetting of the interchangeable lens; and an optical characteristic transmission unit that transmits to the camera body the information relating to optical characteristics stored in the optical characteristic storage unit. And with an image height corresponding to one sixth of an image height from a center of an approximately rectangular photographic field to any of four corners of the photographic field being termed Y1, the optical characteristic storage unit stores, as the information related to vignetting of the interchangeable lens, information specifying vignetting at positions for which image heights from the center are integral multiples of Y1 from 2 through 6 inclusive.