Image Processing Apparatus for Optical Transfer Function Reconstruction
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Solution Overview
Problem
Existing image processing technologies face challenges in efficiently storing and reconstructing optical transfer function (OTF) information for correcting image deterioration caused by image pickup optical systems, due to the large amount of data required for each pixel and varying optical performance across image heights.
Innovation Solution
An image processing apparatus that stores coefficient data for reconstructing the OTF based on the type of image pickup optical system and imaging conditions, determines the tap number for each pixel, and performs sampling up to the Nyquist frequency to reconstruct the OTF, reducing data storage needs and improving image restoration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If OTF information is stored for each pixel to perform image restoration filter processing, then image deterioration correction quality is improved, but data storage amount increases significantly
Solution Approach 1:
The patent segments the OTF information storage by dividing it into two parts: (1) common parameters that are shared across all pixels and stored once, and (2) pixel-specific parameters that are calculated or stored only when needed. This segmentation reduces the overall data storage requirement while maintaining the ability to perform high-quality image restoration for each pixel.
Solution Approach 2:
The patent performs preliminary calculation and storage of common OTF parameters that can be reused across multiple pixels. By pre-computing these shared parameters, the system avoids redundant storage and calculation, thereby reducing data storage requirements while maintaining correction quality.
2Measurement precision
If complete OTF information is stored for all image pickup elements and optical systems, then image restoration accuracy is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal data structure that can handle multiple image pickup elements and optical systems using a common framework. By designing the storage system to be universal and reusable across different configurations, the patent reduces device complexity while maintaining the ability to store and retrieve accurate OTF information when needed.
Solution Approach 2:
The system performs preliminary organization of OTF data into standardized formats and pre-calculates common parameters, reducing the complexity of data management during actual image restoration operations. This preliminary preparation simplifies the overall system complexity while preserving restoration accuracy.
3Measurement precision
If filter processing is performed using stored OTF information, then image correction quality is improved, but processing time increases
Solution Approach 1:
The patent performs preliminary calculation and storage of OTF parameters and filter coefficients that can be reused during image restoration. By pre-computing these values, the system reduces the processing time required during actual image correction while maintaining high correction quality.
Solution Approach 2:
The patent segments the filter processing into stages: (1) retrieval of pre-computed common parameters, and (2) application of pixel-specific corrections. This segmentation allows the system to efficiently process images by reusing pre-computed data, thereby reducing processing time while maintaining correction quality.
Data Source
AI summary
An image processing apparatus includes a data storing portion configured to store coefficient data for reconstructing an optical transfer function of an image pickup optical system in accordance with a type of the image pickup optical system and an imaging condition, a tap number determining portion configured to determine a tap number of the optical transfer function that is reconstructed by using the coefficient data in accordance with a size of one pixel of an image pickup element, and a reconstruction portion configured to reconstruct the optical transfer function in accordance with Nyquist frequency of the image pickup element and the tap number in a frequency space.