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Title: US4794531: Unsharp masking for image enhancement
[ Derwent Title ]

Country: US United States of America

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37 pages

Inventor: Morishita, Koichi; Kawasaki, Japan
Yamagata, Shimbu; Yokohama, Japan
Okabe, Tetsuo; Kashiwa, Japan
Yokoyama, Tetsuo; Tokyo, Japan
Hamatani, Kazuhiko; Tokyo, Japan

Assignee: Hitachi, Ltd, Tokyo, Japan
Hitachi Medical Corporation, Tokyo, Japan
other patents from HITACHI, LTD (252865) (approx. 26,413)
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Published / Filed: 1988-12-27 / 1987-04-22

Application Number: US1987000041627

IPC Code: Advanced: G06T 5/20;
IPC-7: G06F 15/68;

ECLA Code: G06T5/00D3U; G06T5/20;

U.S. Class: Current: 382/132; 382/130;
Original: 364/413.13; 358/111; 382/054;

Field of Search: 364/414 382/054 378/062 358/166,111

Priority Number:
1984-11-07  JP1984000233212
1984-11-07  JP1984000233213
1986-04-25  JP1986000094562

Abstract:     In an unsharp masking processing for sharpening images such as radiographic images, an emphasizing coefficient of an image and parameters for real-time change of picture quality are set interactively. The entire image is divided into a plurality of regional images and filtering optimized for each pixel image is effected using a standard deviation computed for each regional image and a density difference between pixel images.

Attorney, Agent or Firm: Antonelli, Terry & Wands ;

Primary / Asst. Examiners: Smith, Jerry; Jablon, Clark A.

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Related Applications:
Application Number Filed Patent Pub. Date  Title
US1985000795461 1985-11-06       

Parent Case:     This application is a continuation-in-part of application Ser. No. 795,461, filed Nov. 6, 1985, now abandoned.

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First Claim:
Show all 8 claims
We claim:     1. A method of radiographic image enhancement for an unsharp masking processing, comprising the steps of dividing an image into a plurality of local images; obtaining an unsharp image by averaging neighboring pixel values at local regions of the original image; subtracting the unsharp image from the original image to produce a sharp image; and adding an original image at a desired ratio to the sharp image to create a processed image,
  • wherein said averaging step comprises effecting a weighted mean arithmetic operation of the pixel values of the local regions based on a weight coefficient which is determined in accordance with a monotonically decreasing or increasing function with respect to a density difference between a central pixel value and neighboring pixel values.

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Forward References: Show 59 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (59)   |   Backward references (0)   |   Citation Link

Foreign References:
Publication Date IPC Code Assignee   Title
  JP60171573 1985-09       

Other Abstract Info: JAPABS 100294P000127 JAPABS 120129P000101

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