New method of noise smoothing based on gray level and spatial separation

Brent J. Liu; Keh-Shih Chuang

doi:10.1117/12.175088

11 May 1994 New method of noise smoothing based on gray level and spatial separation

Brent J. Liu, Keh-Shih Chuang

Proceedings Volume 2167, Medical Imaging 1994: Image Processing; (1994) https://doi.org/10.1117/12.175088
Event: Medical Imaging 1994, 1994, Newport Beach, CA, United States

Abstract

Medical images produced by x rays as the energy source are subject to contamination by random noise due to the statistical nature of both the x rays and the electomagnetic field. This noise degrades the image quality. There has been a considerable amount of effort devoted to the removal of noise in medical images. The purpose of this project is to introduce a new method that utilizes the natural separation of different populations of pixels with the same gray-level characteristics to smooth image noise efficiently while effectively preserving edges. The assumption is made that pixels inside a small window can be separated into two populations. Only the pixels belonging to the correct population will be used for filtering. Thus smoothing performance is enhanced while maintining the preservation of edges since pixels from the other population are not included in the evaluation. The new filter involves two steps: (1) Pixels are clustered according to their gray-level characteristics. (2) The central pixel is replaced by a weighted averaged value from the population containing the central pixel. The weight is determined by the distance of a given pixel from the central pixel. Preliminary results show effective noise smoothing especially where there is a large uniformity of pixels. Furthermore, there is preservation of edges.

Citation Download Citation

Brent J. Liu and Keh-Shih Chuang "New method of noise smoothing based on gray level and spatial separation", Proc. SPIE 2167, Medical Imaging 1994: Image Processing, (11 May 1994); https://doi.org/10.1117/12.175088

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
8 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Digital filtering

Image filtering

Medical imaging

Chest

Image quality

X-ray imaging

X-rays

Show All Keywords

Keywords/Phrases

Search In:

Publication Years