AUTOMATIC GRADATION-SCALE FORMING METHOD IN DIGITAL RADIATION IMAGE

Title:

AUTOMATIC GRADATION-SCALE FORMING METHOD IN DIGITAL RADIATION IMAGE

Document Type and Number:

Japanese Patent JPH0614193

Kind Code:

A

Abstract:

PURPOSE: To provide the method for automatically adjusting a gradation scale of a digital radiation image. CONSTITUTION: A light (e.g. light in a blue light region) emitted by a storage fluorescent body 10 is detected by a photodetector 34 and converted into a digital image by an A/D converter 36. The digital image is given to an image processor 38, where automatic gradation scale processing and other image processing are applied to the image. That is, a histogram of the digital input image and the accumulated distribution function of the histogram are used to generate final gradation scale conversion by employing an entropy of a sub-section of the histogram. The histogram is divided into a noted area, a low signal foreground area and a high signal background area by using the function above. The gradation scale is formed to be almost a straight line in the noted area by smoothly coupling a nonlinear part at ends of the foreground area and a nonlinear part of the background area.

Inventors:

JIYON ROBAATO KAPOTSUTSUI
RARUFU SHIYATSUTSUINGU

Application Number:

JP31176292A

Publication Date:

January 21, 1994

Filing Date:

November 20, 1992

Export Citation:

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Assignee:

EASTMAN KODAK CO

International Classes:

G06T1/00; G06T5/00; G06T5/40; H04N1/407; A61B6/00; (IPC1-7): H04N1/40; H04N5/325; G06F15/62; G06F15/68

Attorney, Agent or Firm:

Toshihiko Kanayama (2 outside)

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