Image analyzing apparatus and program

Patent metadata

Field	Value
Publication number	US-9811898-B2
Application number	US-201415025799-A
Country	US
Kind code	B2
Filing date	Sep 29, 2014
Priority date	Sep 30, 2013
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

An image analyzing apparatus, a non-transitory computer readable medium storing a program, and a method are provided for extracting voids from a three-dimensional image of a fiber-reinforced composite material. The image analyzing apparatus includes a processor which executes image processing to the three-dimensional image. The processor binarizes the three-dimensional image and creates a binary image, transforms the binary image into a distance and creates a distance image, executes closing processing to the binary image by using the distance image, extracts voids from differences between images before and after the closing processing, among the extracted voids, classifies voids that are adjacent to a background voxel as open voids, and classifies voids that are not adjacent to a background voxel as closed voids, and executes opening processing to the open voids in order to eliminate fake voids.

First claim

The invention claimed is:

1. An image analyzing apparatus for extracting voids from a three-dimensional image of a fiber-reinforced composite material, the image analyzing apparatus comprising:
a processor which executes image processing to the three-dimensional image, wherein the processor:
binarizes the three-dimensional image and creates a binary image;
transforms the binary image into a distance and creates a distance image;
executes closing processing to the binary image by using the distance image;
extracts voids from differences between images before and after the closing processing;
among the extracted voids, classifies voids that are adjacent to a background voxel as open voids, and classifies voids that are not adjacent to a background voxel as closed voids;
executes opening processing to the open voids in order to eliminate fake voids; and
in the closing processing:
executes expansion processing to the binary image by dividing the binary image into a plurality of two-dimensional images, expanding each of the plurality of two-dimensional images by using the distance image corresponding to each of the plurality of two-dimensional images, and calculating a sum set of the plurality of two-dimensional images that were expanded, and
executes contraction processing to the binary image that underwent the expansion processing by dividing the binary image that underwent the expansion processing into a plurality of two-dimensional images, contracting each of the plurality of two-dimensional images by using the distance image corresponding to each of the plurality of two-dimensional images that were divided, and calculating a sum set of the plurality of two-dimensional images that were contracted.

2. The image analyzing apparatus according to claim 1 , wherein the processor, in the closing processing:
expands or contracts each of the plurality of two-dimensional images by using, as a structural element, a sphere having a radius of a value that is half or less of the distance between the fiber bundles configuring the fiber-reinforced composite material.

3. The image analyzing apparatus according to claim 1 , wherein the processor, in the opening processing:
executes contraction processing and expansion processing only to the open voids.

4. The image analyzing apparatus according to claim 3 , wherein the processor, in the opening processing:
executes the contraction processing and the expansion processing by using, as a structural element, a sphere having a radius of a value that is half or less of the radius of the fiber bundles configuring the fiber-reinforced composite material.

5. The image analyzing apparatus according to claim 1 , wherein the processor is a GPU which executes image processing to the three-dimensional image based on a kernel program loaded from a CPU.

6. The image analyzing apparatus according to claim 1 , wherein the three-dimensional image of the fiber-reinforced composite material is an image obtained by imaging the fiber-reinforced composite material, which is configured from fabrics produced via three-dimensional weaving or plain weaving, using an X-ray CT device.

7. A non-transitory computer readable medium storing a program for extracting voids from a three-dimensional image of a fiber-reinforced composite material, wherein the program causes a computer to execute a method comprising:
binarizing the three-dimensional image and creating a binary image;
transforming the binary image into a distance and creating a distance image;
executing closing processing to the binary image by using the distance image;
extracting voids from differences between images before and after the closing processing;
among the extracted voids, classifying voids that are adjacent to a background voxel as open voids, and classifying voids that are not adjacent to a background voxel as closed voids;
executing opening processing to the open voids in order to eliminate fake voids; and
in the closing processing:
executing expansion processing to the binary image by dividing the binary image into a plurality of two-dimensional images, expanding each of the plurality of two-dimensional images by using the distance image corresponding to each of the plurality of two-dimensional images, and calculating a sum set of the plurality of two-dimensional images that were expanded, and
executing contraction processing to the binary image that underwent the expansion processing by dividing the binary image that underwent the expansion processing into a plurality of two-dimensional images, contracting each of the plurality of two-dimensional images by using the distance image corresponding to each of the plurality of two-dimensional images that were divided, and calculating a sum set of the plurality of two-dimensional images that were contracted.

8. A method for extracting voids from a three-dimensional image of a fiber-reinforced composite material, the method comprising:
binarizing the three-dimensional image and creating a binary image;
transforming the binary image into a distance and creating a distance image;
executing closing processing to the binary image by using the distance image;
extracting voids from differences between images before and after the closing processing;
among the extracted voids, classifying voids that are adjacent to a background voxel as open voids, and classifying voids that are not adjacent to a background voxel as closed voids;
executing opening processing to the open voids in order to eliminate fake voids; and
in the closing processing:
executing expansion processing to the binary image by dividing the binary image into a plurality of two-dimensional images, expanding each of the plurality of two-dimensional images by using the distance image corresponding to each of the plurality of two-dimensional images, and calculating a sum set of the plurality of two-dimensional images that were expanded, and
executing contraction processing to the binary image that underwent the expansion processing by dividing the binary image that underwent the expansion processing into a plurality of two-dimensional images, contracting each of the plurality of two-dimensional images by using the distance image corresponding to each of the plurality of two-dimensional images that were divided, and calculating a sum set of the plurality of two-dimensional images that were contracted.

Assignees

• Ihi Corp
• Univ Tokyo

Inventors

• Hishida Hiroyuki
• Inagaki Koichi
• Nakamura Takeshi
• Michikawa Takashi
• Suzuki Hiromasa

Classifications

• G06F18/22

  Matching criteria, e.g. proximity measures · CPC title

• G06F18/24

  Classification techniques · CPC title

• G01N21/8851

  Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges (G01N21/8806 and G01N21/93 - G01N21/95692 take precedence; optical measurement of dimensions G01B11/00; optical scanning G02B26/10; image transformation G06T3/00; computerised image enhancement G06T5/00; image processing per se for flaw detection G06T7/0002) · CPC title

• G06T2200/04

  involving 3D image data · CPC title

• G01N23/04 Primary

  and forming images of the material · CPC title