Condenser Lens Image Quality Correction for Oblique Light
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Solution Overview
Problem
Existing imaging apparatuses fail to adequately correct image quality deterioration caused by oblique incident light, as current correction methods rely on insufficient or uniform correction coefficients, neglecting the unique incidence angles and light ray convergence characteristics of different lenses.
Innovation Solution
An imaging apparatus with a condenser lens optical system and a solid-state imaging device, where light rays are converged into a conical shape, allowing for image quality correction based on specific correction quantities defined by the image height direction angle width and incidence angle, using stored data to select appropriate correction coefficients for each lens and image height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uniform correction coefficients are used for all lenses with the same F-number and pupil distance, then the correction process is simplified, but image quality deterioration in peripheral portions cannot be adequately corrected
Solution Approach 1:
The patent applies local quality by creating different correction coefficient tables for different image height regions (central portion and peripheral portion). Instead of using a single uniform correction coefficient for all pixels, the system divides the image sensor into regions and applies region-specific correction coefficients. This allows the central portion and peripheral portion to be corrected according to their respective light incidence characteristics, thereby improving image quality correction accuracy while maintaining reasonable system complexity.
2Manufacturing precision
If different correction coefficients are used for different image height portions, then image quality correction accuracy is improved, but data volume and processing complexity increase
Solution Approach 1:
The patent applies segmentation by dividing the correction coefficient data into multiple tables corresponding to different image height portions. Each table contains correction coefficients tailored to specific regions (e.g., central portion table and peripheral portion table). This segmentation allows the system to manage correction data more efficiently by only loading and processing the relevant table for each image region, thereby reducing the effective data volume and processing complexity while maintaining high correction accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively corrects image quality issues in peripheral pixels by using tailored correction coefficients, improving image quality even with oblique light incidence, reducing data volume and enhancing correction accuracy.
Implementation Method 1
a condenser lens optical system and a solid-state imaging device so that a pencil of incident light rays passing through the condenser lens optical system and then incident on the solid-state imaging device can be converged in a conical shape with a result that an image of the pencil of incident light rays can be formed on one point of a light receiving surface of the solid-state imaging device due to light condensing effect of the condenser lens optical system
Data Source
AI summary
An imaging apparatus includes a condenser lens optical system and a solid-state imaging device so that a pencil of incident light rays passing through the condenser lens optical system and then incident on the solid-state imaging device can be converged in a conical shape with a result that an image of the pencil of incident light rays can be formed on one point of a light receiving surface of the solid-state imaging device due to light condensing effect of the condenser lens optical system, and the imaging apparatus further includes a correcting portion which performs image quality correction on a taken image signal outputted from the solid-state imaging device in accordance with set correction quantities; and each of the correction quantities is defined in accordance with an image height direction angle width and an incidence angle as defined herein.