Image processing apparatus, alignment method and storage medium

Patent metadata

Field	Value
Publication number	US-2019073758-A1
Application number	US-201816122471-A
Country	US
Kind code	A1
Filing date	Sep 5, 2018
Priority date	Sep 7, 2017
Publication date	Mar 7, 2019
Grant date	—

Abstract

A first area and a second area are set for a first two-dimensional tomographic image where the first area and the second area overlap each other in a partial area in a horizontal direction of the first two-dimensional tomographic image. A positional deviation amount between the first two-dimensional tomographic image and a second two-dimensional tomographic image is obtained in each of the first area and the second area. A moving amount of the second two-dimensional tomographic image is determined with respect to the first two-dimensional tomographic image in an area where the first area and the second area overlap based on the positional deviation amount in the first area and the positional deviation amount the second area. Alignments are performed on the first two-dimensional tomographic image and the second two-dimensional tomographic image in an area where the first area and the second area overlap based on the moving amount.

First claim

What is claimed is:

1 . An image processing apparatus, comprising:
a first obtaining unit configured to obtain a first two-dimensional tomographic image and a second two-dimensional tomographic image, the first two-dimensional tomographic image and the second two-dimensional tomographic image being obtained based on measurement light controlled to scan an identical position of an eye; a setting unit configured to set a first area and a second area for the first two-dimensional tomographic image, the first area and the second area overlapping each other in a partial area in a horizontal direction of the first two-dimensional tomographic image; a second obtaining unit configured to obtain a positional deviation amount between the first two-dimensional tomographic image and the second two-dimensional tomographic image in each of the first area and the second area; and a determination unit configured to determine a moving amount of the second two-dimensional tomographic image with respect to the first two-dimensional tomographic image in an area where the first area and the second area overlap based on the positional deviation amount in the first area and the positional deviation amount in the second area.

2 . The image processing apparatus according to claim 1 , wherein the determination unit is configured to determine a moving amount of the second two-dimensional tomographic image with respect to the first two-dimensional tomographic image in an area where the first area and the second area overlap based on a difference between the positional deviation amount in the first area and the positional deviation amount in the second area and a position within the overlapping area.

3 . The image processing apparatus according to claim 1 , wherein the determination unit determines a moving amount of the second two-dimensional tomographic image with respect to the first two-dimensional tomographic image in an area between a center of the first area and a center of the second area based on a difference between the positional deviation amount in the first area and the positional deviation amount in the second area and a position within the area between the center of the first area and the center of the second area.

4 . The image processing apparatus according to claim 1 , wherein the determination unit determines a moving amount of the second two-dimensional tomographic image with respect to the two-dimensional tomographic image at a center of the first area based on the positional deviation amount in the first area between the positional deviation amount in the first area and the positional deviation amount in the second area.

5 . The image processing apparatus according to claim 1 , wherein the first area and the second area have an equal size in the horizontal direction.

6 . The image processing apparatus according to claim 4 , wherein the first area and the second area have a positional relationship in the horizontal direction, which is set based on a range in the horizontal direction obtained by a comparison of the first two-dimensional tomographic image and the second two-dimensional tomographic image by the second obtaining unit for acquiring a positional deviation amount.

7 . The image processing apparatus according to claim 1 ,
wherein the setting unit sets a third area and a fourth area not overlapping each other for the first two-dimensional tomographic image instead of the first area and the second area based on a result of an analysis performed on the first two-dimensional tomographic image or an angle of view of the first two-dimensional tomographic image; wherein the second obtaining unit obtains positional deviation amounts of the first two-dimensional tomographic image and the second two-dimensional tomographic image in each of the third area and the fourth area; and wherein the determination unit determines a moving amount of the second two-dimensional tomographic image with respect to the first two-dimensional tomographic image in the third area and the fourth area based on the positional deviation amount in the third area and the positional deviation amount in the fourth area.

8 . The image processing apparatus according to claim 1 , wherein the setting unit changes a size of an area where the first area and the second area overlap based on an angle of view of the first two-dimensional tomographic image.

9 . An alignment method comprising:
obtaining a first two-dimensional tomographic image and a second two-dimensional tomographic image, the first two-dimensional tomographic image and the second two-dimensional tomographic image being obtained based on measurement light controlled to scan an identical position of an eye; setting a first area and a second area for the first two-dimensional tomographic image, the first area and the second area overlapping each other in a partial area in a horizontal direction of the first two-dimensional tomographic image; obtaining a positional deviation amount between the first two-dimensional tomographic image and the second two-dimensional tomographic image in each of the first area and the second area; determining a moving amount of the second two-dimensional tomographic image with respect to the first two-dimensional tomographic image in an area where the first area and the second area overlap based on the positional deviation amount in the first area and the positional deviation amount in the second area; and performing alignments on the first two-dimensional tomographic image and the second two-dimensional tomographic image in an area where the first area and the second area overlap based on the moving amount.

10 . A non-transitory computer-readable storage medium storing a program for causing a computer to execute the method according to claim 9 .

Assignees

• Canon Kk

Inventors

• Iwase Yoshihiko
• Sagano Osamu
• Sato Makoto
• Uchida Hiroki

Classifications

• G06T2207/20216

  Image averaging · CPC title

• G06T2207/10101

  Optical tomography; Optical coherence tomography [OCT] · CPC title

• A61B3/102 Primary

  for optical coherence tomography [OCT] · CPC title

• G06T5/50 Primary

  using two or more images, e.g. averaging or subtraction · CPC title

• G06T7/337

  involving reference images or patches · CPC title