Digital Radiography Line Artifact Removal via Pixel Selection
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Solution Overview
Problem
Existing digital radiography systems face challenges in effectively removing line artifacts from images, especially when a non-detection area shielded from radiation is not appropriately obtained, leading to degraded image quality.
Innovation Solution
An image processing device and method that selects pixels based on pixel values to extract and subtract line artifacts using a profile in a predetermined direction, employing a pixel selection unit, extraction processing unit, subtraction processing unit, and tone conversion unit to enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If line artifact removal is performed using a profile from a non-detection area shielded from radiation, then line artifact removal accuracy is improved, but the method becomes inapplicable when no non-detection area is available
Solution Approach 1:
The patent creates a virtual non-detection area by copying and extending signal components from actual non-detection regions (or synthesizing equivalent low-frequency profiles) when physical non-detection areas are unavailable. This allows the profile-based line artifact removal method to be applied universally across different imaging scenarios without requiring physical shields.
Solution Approach 2:
The patent transforms the approach from relying on physical non-detection area parameters to using signal processing parameters. By extracting low-frequency components through Fourier transformation and manipulating frequency domain parameters, the system achieves line artifact removal that is independent of physical detector configuration.
2Manufacturing precision
If image processing is performed to remove line artifacts, then image quality is improved, but processing complexity increases
Solution Approach 1:
The patent replaces complex spatial-domain filtering operations with frequency-domain processing using Fast Fourier Transform. This substitution simplifies the computational mechanics by transforming convolution operations into multiplication operations in the frequency domain, reducing processing complexity while maintaining image quality.
Solution Approach 2:
The patent changes the processing domain from spatial to frequency domain, allowing line artifacts to be removed by simple parameter adjustments in the frequency domain rather than complex iterative spatial filtering. This parameter transformation significantly reduces computational complexity.
Data Source
AI summary
An image processing device and a radiography apparatus each include a pixel selection unit configured to select pixels of an image based on pixel values of pixels of the image obtained by capturing an image of a subject, and a subtraction processing unit configured to subtract, from the image, a line artifact extracted using a profile in predetermined direction and is based on the pixels selected by the pixel selection unit.