Reducing speckle noise in optical coherence tomography images
US-2017131082-A1 · May 11, 2017 · US
Image processing apparatus, alignment method and storage medium
US2019073780A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2019073780-A1 |
| Application number | US-201816122278-A |
| Country | US |
| Kind code | A1 |
| Filing date | Sep 5, 2018 |
| Priority date | Sep 7, 2017 |
| Publication date | Mar 7, 2019 |
| Grant date | — |
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Abstract
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An image processing apparatus includes an 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 selection unit configured to select a positional deviation amount between a layer boundary of the first two-dimensional tomographic image and a layer boundary of the second two-dimensional tomographic image in partial regions of a plurality of regions dividing the first two-dimensional tomographic image in a horizontal direction, and an alignment means configured to perform an alignment on the first two-dimensional tomographic image and the second two-dimensional tomographic image based on a positional deviation amount selected by the selection unit.
First claim
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What is claimed is: 1 . An image processing apparatus comprising: an 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 selection unit configured to select a positional deviation amount between a layer boundary of the first two-dimensional tomographic image and a layer boundary of the second two-dimensional tomographic image in partial regions of a plurality of regions dividing the first two-dimensional tomographic image in a horizontal direction; and an alignment means configured to perform an alignment on the first two-dimensional tomographic image and the second two-dimensional tomographic image based on a positional deviation amount selected by the selection unit. 2 . The image processing apparatus according to claim 1 , wherein the selection unit selects a positional deviation amount of a partial region from a positional deviation amount between a layer boundary of the first two-dimensional tomographic image and a layer boundary of the second two-dimensional tomographic image obtained for each of the plurality of regions. 3 . The image processing apparatus according to claim 2 , wherein the selection unit selects a plurality of positional deviation amounts based on values of variations of the positional deviation amounts from positional deviation amounts of the plurality of regions. 4 . The image processing apparatus according to claim 3 , wherein the selection unit selects a plurality of positional deviation amounts having a minimum value indicative of a variation from positional deviation amounts of the plurality of regions. 5 . The image processing apparatus according to claim 3 , wherein the selection unit selects a predetermined number of positional deviation amounts from positional deviation amounts of the plurality of regions. 6 . The image processing apparatus according to claim 1 , wherein the selection unit sorts positional deviation amounts of the plurality of regions in order based on values of the positional deviation amounts, sequentially selects combinations of a predetermined number positional deviation amounts in increasing or decreasing order of the values, calculates values indicative of a variation of each of the combinations, and selects a combination of positional deviation amounts with a minimum value indicative of the variation. 7 . The image processing apparatus according to claim 3 , wherein the value indicative of the variation is a value of a variance or a standard deviation. 8 . The image processing apparatus according to claim 1 , wherein the selection unit selects a plurality of positional deviation amounts, and wherein the alignment unit performs an alignment by handling an average value or a median value of a plurality of positional deviation amounts selected by the selection unit as a moving amount of the second two-dimensional tomographic image with respect to the first two-dimensional tomographic image. 9 . The image processing apparatus according to claim 1 , wherein the positional deviation amount is a positional deviation amount of a layer boundary in a depth direction of a two-dimensional tomographic image. 10 . 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; selecting a positional deviation amount between a layer boundary of the first two-dimensional tomographic image and a layer boundary of the second two-dimensional tomographic image in partial regions of a plurality of regions dividing the first two-dimensional tomographic image in a horizontal direction; and performing an alignment on the first two-dimensional tomographic image and the second two-dimensional tomographic image based on a positional deviation amount selected by the selecting. 11 . A non-transitory computer-readable storage medium storing a program for causing a computer to execute the method according to claim 10 .
Assignees
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Classifications
Optical tomography; Optical coherence tomography [OCT] · CPC title
Edge detection · CPC title
Biomedical image inspection · CPC title
- G06T7/337Primary
involving reference images or patches · CPC title
using feature-based methods · CPC title
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- What does patent US2019073780A1 cover?
- An image processing apparatus includes an 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 selection unit configured to select a po…
- Who is the assignee on this patent?
- Canon Kk
- What technology area does this patent fall under?
- Primary CPC classification G06T7/337. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Thu Mar 07 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).