Interchangeable Lens Optical Correction via Parameter Identification
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Solution Overview
Problem
Interchangeable-lens image capture apparatuses face challenges in accurately correcting image deterioration caused by varying optical characteristics, as conventional techniques fail to account for the unique optical parameters required for each lens unit model, leading to improper corrections.
Innovation Solution
The system determines the type of interchangeable lens and obtains necessary optical parameters, including magnification, to identify specific optical correction values, enabling accurate optical correction by communicating between the camera control unit and lens control unit through electrical connections in the camera mount, and storing correction data for each lens type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single set of optical correction values is used for all lens units, then device complexity is reduced, but measurement precision deteriorates because optical characteristics vary across different lens models
Solution Approach 1:
The patent applies parameter changes by storing multiple sets of optical correction values, each corresponding to different optical parameters (focal length, aperture value, shooting distance). The system dynamically selects and applies the appropriate correction set based on the actual shooting parameters, thereby adapting the correction process to match the specific optical characteristics of each lens unit and shooting condition without requiring a completely separate correction system for each lens model
Solution Approach 2:
The patent implements universality by creating a correction data structure that can serve multiple lens units with different optical characteristics. By organizing correction values according to optical parameters rather than lens-specific identifiers, the system achieves multi-functionality where a single correction database can accommodate various lens models (including macro lenses, telephoto lenses, and standard lenses) as long as their optical parameters fall within the defined ranges
2Ease of operation
If optical correction values are determined based on shooting distance only, then ease of operation is improved, but manufacturing precision deteriorates because optical characteristics also depend on focal length and aperture value
Solution Approach 1:
The patent applies segmentation by dividing the optical correction data into distinct segments or sets, where each set corresponds to a specific combination of optical parameters (focal length range, aperture value range, shooting distance range). This segmentation allows the system to select the most appropriate correction set based on the current shooting conditions, improving accuracy without requiring complex real-time calculations. The correction data is segmented into discrete categories that can be efficiently searched and applied
Solution Approach 2:
The patent implements dynamics by making the optical correction process adaptive to changing shooting conditions. The system dynamically determines which correction set to apply based on real-time optical parameters (focal length, aperture value, shooting distance), allowing the correction values to change automatically as shooting conditions change. This dynamic approach ensures accurate correction across varying conditions without requiring manual intervention to select correction parameters
3Measurement precision
If discrete correction values are stored for all possible parameter combinations, then measurement precision is improved, but device complexity increases due to storage capacity requirements
Solution Approach 1:
The patent applies partial action by storing correction values for discrete, representative combinations of optical parameters rather than attempting to store continuous correction data for all possible parameter values. The system uses interpolation or approximation methods to determine correction values for parameters between the stored discrete sets. This approach provides sufficiently accurate correction for practical purposes while dramatically reducing storage requirements compared to storing all possible combinations
Data Source
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AI summary
A plurality of types of interchangeable lenses (100) having mutually different optical parameters required for identifying the optical correction values can be attached to the image capture apparatus (10). First, predetermined optical parameters are obtained regardless of what type of interchangeable lens (100) is attached. Furthermore, in the case where the type of the attached interchangeable lens (100) is a type that requires different optical parameters than the predetermined optical parameters for identifying the optical correction value, the necessary optical parameters are obtained. The optical correction value is identified based on the type of the attached interchangeable lens (100) using the predetermined optical parameters, other optical parameters, and so on, and optical correction is then carried out.