US 7,460,700 B2Granted

Image processing method and computer-readable recording medium containing image processing program

AssigneesNihon University, Matsumoto Dental University, J. Morita Manufacturing Corporation

InventorsHitoshi Tsunashima, Ayuta Yamada, Hozumi Kanari, Yoshinori Arai

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Abstract

An image processing method which corrects a 3-dimensional CT data value obtained from a 3-dimensional object is provided. The image processing method comprises: a threshold setting step of setting a threshold value used for generating a correction value from the 3-dimensional CT data value obtained from the 3-dimensional object; an average calculating step of calculating an average value of a 3-dimensional CT data block comprising a 3-dimensional CT data element of a correction target and a plurality of 3-dimensional CT data elements in a neighborhood of the 3-dimensional CT data element of the correction target; and a correction step of correcting the 3-dimensional CT data value by using the threshold value set in the threshold setting step and the average value obtained in the average calculating step.

Claims2

Dependent claims

An image processing method which processes 3-dimensional CT data obtained from a 3-dimensional object, comprising:

an integrated value calculating step of calculating an integrated value of a predetermined number of 3-dimensional CT data elements which are consecutive with a currently observed 3-dimensional CT data element being set as a starting point, for each of a plurality of directions with the currently observed 3-dimensional CT data element being set as a starting point;
a sum calculating step of calculating both a sum of a predetermined number of upper-rank integrated values among respective integrated values calculated for the plurality of directions in the integrated value calculating step and a sum of a predetermined number of lower-rank integrated values among the respective integrated values calculated for the plurality of directions in the integrated value calculating step;
a correction step of correcting a currently observed 3-dimensional CT data element based on the sum of the predetermined number of upper-rank integrated values and the sum of the predetermined number of lower-rank integrated values;
and
a judgment step of comparing the corrected 3-dimensional CT data element obtained in the correction step with a predetermined threshold value, and determining the currently observed 3-dimensional CT data element as being data of a processing target when the corrected 3-dimensional CT data element is larger than the threshold value.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/565,895Filed 26 Jul 2004
Priority: JP 2003-20142224 Jul 2003
Published: US 2007/0009144 A111 Jan 2007
Granted: 2 Dec 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

G06T 5/70
Image enhancement or restoration: denoising; Smoothing
G06T 5/20
Image enhancement or restoration: using local operators
G06T 5/94
Dynamic range modification of images or parts thereof: based on local image properties, e.g. for local contrast enhancement
G06V 10/30
Image preprocessing: noise filtering