Radiation Imaging Pixel Correction and Interpolation
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Solution Overview
Problem
In radiation imaging apparatuses using Flat Panel Detectors, defective pixels can lead to decreased accuracy in interpolation due to nearby pixels outputting abnormal signals, potentially causing artifacts.
Innovation Solution
A radiation imaging apparatus with a storage unit for defective pixel position information, a correction unit to detect and correct abnormal pixels not stored in the system, and an interpolation unit to generate pixel values based on nearby pixels, ensuring accurate interpolation and suppressing artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel values of nearby pixels are used for interpolation of defective pixels, then the defective pixel values can be reconstructed, but artifacts may occur when nearby pixels output abnormal signals due to noise
Solution Approach 1:
The patent applies preliminary action by performing correction processing on pixels that temporarily output abnormal signals before performing interpolation processing on defective pixels. The correction unit identifies and corrects abnormally outputting pixels using reference pixel values from surrounding areas, ensuring that the pixel values used for subsequent interpolation are clean and free from temporary noise artifacts. This sequential processing order (correction first, then interpolation) prevents artifact propagation.
Solution Approach 2:
The patent introduces an intermediary correction processing step between the raw pixel data and the interpolation process. The correction unit acts as an intermediary that filters out temporarily abnormal pixels before they can contaminate the interpolation calculation. This intermediary layer ensures that only properly corrected pixel values are used as reference points for defective pixel reconstruction.
2Object-affected harmful factors
If correction processing is performed before interpolation processing, then artifacts are suppressed, but processing complexity increases
Solution Approach 1:
The patent segments the image processing into distinct functional units: a correction unit for handling temporarily abnormal pixels and an interpolation unit for handling defective pixels. Each unit has a specific function and operates in a defined sequence. This segmentation allows the system to manage complexity through modular design, where each unit can be independently optimized and maintained.
Solution Approach 2:
The correction unit automatically identifies and corrects pixels with temporary abnormal signals by comparing them with reference pixel values from surrounding areas. This self-correcting mechanism operates without manual intervention and prepares the data for subsequent interpolation processing, reducing the overall system complexity while maintaining high image quality.
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
The solution effectively suppresses artifacts and improves the reliability of radiation images by correcting abnormal pixels before interpolation, thereby enhancing image accuracy.
Implementation Method 1
an imaging unit including a plurality of pixels configured to convert incident radiation into an electrical signal
Data Source
AI summary
A radiation imaging apparatus is provided. The apparatus comprises: an imaging unit including a plurality of pixels configured to convert incident radiation into an electrical signal; a storage unit configured to store position information of a first pixel, among the pixels, which always outputs an abnormal pixel value; a correction unit configured to detect a second pixel, among the pixels, which is not stored in the storage unit and outputs an abnormal pixel value, and correct the pixel value of the second pixel; and an interpolation unit configured to, after image data output from the imaging unit is processed by the correction unit, generate a pixel value of the first pixel based on the position information and a pixel value of a pixel, among the pixels, which is arranged near the first pixel.