MEASUREMENT APPARATUS AND PROGRAM

• US 20140205150A1
• Filed: 12/17/2013
• Published: 07/24/2014
• Est. Priority Date: 01/22/2013
• Status: Active Grant

• Current Assignee: Evident Corporation
• Original Assignee: Olympus Corporation
• Inventors: OGAWA, Kiyotomi
• Granted Patent: US 10,019,643 B2
• Time in Patent Office: Days
• US Class Current: 382/106
• CPC Class Codes: A61B 1/000095 for image enhancement
• CPC Class Codes: G01B 11/002 for measuring two or more coordinates
• CPC Class Codes: G01B 11/14 for measuring distance or clearance between spaced objects or spaced apertures G01B11/26 takes precedence; rangefinders G01C3/00
• CPC Class Codes: G06T 2207/10068 Endoscopic image
• CPC Class Codes: G06T 2207/30108 Industrial image inspection
• CPC Class Codes: G06T 7/13 Edge detection
• CPC Class Codes: G06T 7/62 of area, perimeter, diameter or volume

Abstract

A region-setting unit sets, in an image, a region based on one reference point designated by a user in the image or a predetermined region as an extraction region. An edge extraction unit extracts an edge of the subject based on an image of the extraction region. When a plurality of edges are extracted, a display control unit causes a line indicating the plurality of extracted edges to be displayed on a display unit together with the image. An edge selection unit selects a reference edge from among the plurality of extracted edges based on an instruction from the user. A three-dimensional coordinate calculation unit calculates three-dimensional coordinates corresponding to points in the image. A reference line calculation unit calculates a reference line on a space based on the three-dimensional coordinates corresponding to points constituting the reference edge.

Claims

1. A measurement apparatus comprising:

an imaging unit that images a subject to generate an image data;

a display unit that displays an image based on the image data;

a region-setting unit that sets, in the image, a predetermined region in the image or a region based on a reference point designated by a user as an extraction region from which an edge of the subject is extracted;

an edge extraction unit that extracts the edge of the subject based on an image of the extraction region;

a display control unit that causes a graphic indicating the extracted edge to be displayed on the display unit together with the image;

an edge selection unit that selects a reference edge from among a plurality of extracted edges based on an instruction from the user when the plurality of edges are extracted;

a three-dimensional coordinate calculation unit that calculates three-dimensional coordinates corresponding to points in the image;

a reference line calculation unit that calculates a reference line on a space based on the three-dimensional coordinates corresponding to a plurality of points constituting the reference edge;

a measurement point designation unit that designates a measurement point in the image; and

a distance calculation unit that calculates a distance between the three-dimensional coordinate corresponding to the measurement point and the reference line.

2. The measurement apparatus according to claim 1, wherein:

the three-dimensional coordinate calculation unit calculates three-dimensional coordinates corresponding to points in a predetermined range including the predetermined region in the image at a time point at which an instruction from the user for starting up a measurement function is input or at a time point at which an instruction from the user for acquiring a still image displayed on the display unit is input, and

the region-setting unit sets the extraction region in the predetermined region.

3. The measurement apparatus according to claim 2, wherein:

the region-setting unit further sets a selection region from which the edge of the subject is selected, based on a reference point designated by the user in the image,

when a plurality of edges are extracted, the edge selection unit selects edges overlapping the selection region from among the plurality of edges, and selects a reference edge from among the edges overlapping the selection region based on an instruction from the user, and

the display control unit causes lines indicating the edges overlapping the selection region to be displayed on the display unit together with the image.

4. The measurement apparatus according to claim 1, wherein:

when a plurality of edges are extracted, the display control unit causes a graphic indicating the plurality of extracted edges and information of an order based on an index value of each edge to be displayed on the display unit together with the image.

5. The measurement apparatus according to claim 4, wherein:

the region-setting unit further sets a selection region from which the edge of the subject is selected, based on a reference point designated by the user in the image, and

when the plurality of edges are extracted, the edge selection unit selects edges overlapping the selection region from among the plurality of edges, calculates the index values of the edges overlapping the selection region, and selects a reference edge from among the edges overlapping the selection region based on an instruction from the user.

6. The measurement apparatus according to claim 1, wherein the edge extraction unit further traces the edge of the subject based on an image of an outside of the extraction region for the extracted edge.

7. A computer program product storing a program that causes a computer to perform steps of:

Setting a predetermined region in an image which is based on image data by imaging a subject and generated by an imaging unit or a region based on a reference point designated by a user as an extraction region from which an edge of the subject is extracted;

extracting the edge of the subject based on an image of the extraction region;

causing a graphic indicating the extracted edge to be displayed on a display unit together with the image;

selecting a reference edge from among a plurality of extracted edges based on an instruction from the user when the plurality of edges are extracted;

calculating three-dimensional coordinates corresponding to points in the image;

calculating a reference line on a space based on the three-dimensional coordinates corresponding to a plurality of points constituting the reference edge;

designating a measurement point in the image; and

calculating a distance between the three-dimensional coordinate corresponding to the measurement point and the reference line.