Radiation Imaging Abnormal Pixel Correction via Preliminary Replacement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing radiation imaging apparatuses using Flat Panel Detectors (FPDs) face inefficiencies in detecting and correcting abnormal pixels due to the reliance on defective pixel maps, which degrades processing efficiency.
Innovation Solution
A radiation imaging apparatus with an image capturing unit, a storage unit for defective pixel position information, a replacing unit that sets a preset value for defective pixels, and a correction unit that detects and corrects abnormal pixels not stored in the map, using data from replaced pixels to improve detection and correction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a defective pixel map is referred to for each pixel and abnormal pixels are detected and corrected using pixels other than defective pixels, then the accuracy of abnormal pixel detection is improved, but the processing efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by replacing defective pixel values with preset values before abnormal pixel detection. The replacing unit substitutes abnormal values in defective pixels with predetermined values (e.g., average or median of neighboring pixels) before the correction unit performs abnormal pixel detection. This preliminary replacement eliminates the need to exclude defective pixels during detection, improving processing efficiency while maintaining detection accuracy.
2Measurement precision
If defective pixels are excluded from neighboring pixels used for correction, then the accuracy of correction is improved, but the complexity of the detection process increases
Solution Approach 1:
The patent resolves this contradiction by performing preliminary replacement of defective pixel values before correction. By substituting defective pixel values with preset values in advance, the correction unit can uniformly treat all pixels without needing complex logic to identify and exclude defective pixels from neighboring pixel selections, thus maintaining correction accuracy while simplifying the detection process.
Solution Approach 2:
The patent extracts the problematic aspect (defective pixel values) from the system by replacing them with preset values before correction. This separation allows the correction unit to operate on a simplified data set where defective pixels no longer interfere with the correction logic, reducing process complexity while preserving correction accuracy through the use of predetermined replacement values.
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 enhances the processing efficiency of detecting and correcting abnormal pixels by eliminating the need to refer to defective pixel maps for neighboring pixels, allowing for more accurate and efficient image data generation and correction.
Implementation Method 1
an image capturing unit (110) including a plurality of pixels configured to convert incident radiation into electrical signals
Data Source
AI summary
A radiation imaging apparatus is provided. The apparatus comprises an image capturing unit that is provided with pixels for converting incident radiation into electrical signals and is configured to output first image data, a storage unit configured to store position information of a first pixel which continuously outputs an abnormal pixel value, a replacing unit configured to generate second image data from the first image data by replacing a pixel value of the first pixel with a preset setting value based on the position information and a correction unit configured to detect a second pixel which is not stored in the storage unit and outputs an abnormal pixel value, and correct the pixel value of the second pixel. The correction unit detects and corrects the second pixel based on the second image data that includes the first pixel whose pixel value has been replaced.