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Image Analysis

Automatic-background-recognition-and-removal-ABRR-in-projection-digital-radiographic-images-PDRI

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Automatic background recognition and removal (ABRR) in projection digital radiographic images (PDRI)

Details

Inventors: Huang, H. K.; Zhang, Jianguo;
Assignee: The Regents of the University of California (Oakland, CA)
Primary Examiner: Rogers; Scott
Assistant Examiner:
Attorney, Agent or Firm: Townsend and Townsend and Crew LLP

A system for removal of background from projected digital radiograph images utilizes statistical methods to identify background pixel candidates and probable background edges of a PDRI. Thresholds for evaluating the probable background edges are determined utilizing statistical results and a reliable estimation of background removal is performed.

DETAILED DESCRIPTION The present invention is a novel method and/or system for automatically recognizing and removing background signals in digital radiography images caused by X-ray collimation during projection radiographic examinations.
According to one aspect of the invention, a statistical curve is derived based on many hierarchical CR sample images as a first approximation to loosely separate image and background pixels.
According to another aspect of the invention, signal processing methods, including specific sampling, filtering and angle recognition, are used to determine edges between image and background pixels.
According to another aspect of the invention, adaptive parameter adjustments and consistent and reliable estimation rules are used to finalize the location of edges and remove the background.
In addition, this aspect also evaluates the reliability of the complete background removal operation.
Other features and advantages of the invention will become apparent in view of the following detailed description and appended drawings.

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