Image measuring apparatus, program, and teaching method of image measuring apparatus

• US 8,538,165 B2
• Filed: 04/21/2011
• Issued: 09/17/2013
• Est. Priority Date: 05/11/2010
• Status: Active Grant

• Current Assignee: Mitutoyo Corporation
• Original Assignee: Mitutoyo Corporation
• Inventors: Kojima, Tsukasa, Ariga, Kozo, Miyakura, Jyota
• Primary Examiner(s): Li, Ruiping
• Application Number:
  US13/091,350
• Publication Number:
  US 20110280496A1
• Time in Patent Office: 880 Days
• Field of Search: 382/145, 382/147, 382/149, 382/199, 382/203
• US Class Current: 382/199
• CPC Class Codes: G06T 2207/30141 Printed circuit board [PCB]
• CPC Class Codes: G06T 2207/30164 Workpiece; Machine component
• CPC Class Codes: G06T 7/13 Edge detection

Abstract

A data memory storing Gerber data containing closed area information of a work; a display displaying a pattern image based on the closed area information of the Gerber data; a detection specification information display program displaying on the display a detection tool specifying a location of edge to be detected, a detection direction and detection length, by superimposing on the pattern image; an image capturing program and an image capturer capturing an image of an area corresponding to the detection tool of the work; an edge detection program performing an edge detection of the location of the edge to be detected with respect to data of a captured image; and a condition determination program determining a light-dark change condition indicating whether an image is changing from a light section to a dark section or from a dark section to a light section along a detection direction.

Claims

1. An image measuring apparatus comprising:

a data memory configured to store Gerber data containing closed area information of a measured object;

a display configured to display a pattern image based on the closed area information of the Gerber data;

an inputter that receives an input of a location of an edge to be detected, a detection direction and a detection length;

a detection specification information displayer configured to display, on the display, detection specification information specifying the location of the edge to be detected, the detection direction and the detection length, by superimposing the detection specification information on the pattern image displayed on the display;

an image capturer configured to capture an image of an area corresponding to the detection specification information of the measured object, when the detection specification information is displayed on the display by the detection specification information displayer, by superimposing the detection specification information on the pattern image;

an edge detector configured to perform an edge detection of the location of the edge to be detected, with respect to data of the image captured by the image capturer, according to the detection direction and the detection length specified by the detection specification information, and according to a light-dark change parameter; and

a condition determiner configured to determine, by using the Gerber data, a light-dark change condition indicating whether the image changes from a light section to a dark section or from a dark section to a light section along the detection direction based upon the detection direction of the detection specification information, before the edge detector performs the edge detection,

wherein the edge detector performs the edge detection using the light-dark change condition determined by the condition determiner, as the light-dark change parameter.

2. The image measuring apparatus according to claim 1, comprising:

a graphic data preparer configured to prepare, from the Gerber data, at least one of one graphic data and a plurality of graphic data, corresponding to an outline of a closed area of the pattern image;

a searcher configured to search, from among the graphic data prepared by the graphic data preparer, a graphic having an intersection point with the detection specification information;

a judger configured to judge whether a graphic having an intersection point with the detection specification information is found by the searcher; and

a detection direction decider configured to decide, when it is judged by the judger that a graphic having an intersection point with the detection specification information is found, whether the detection direction of the detection specification information is toward inside or outside with respect to the graphic, based on an angle formed by a vector directed toward a center of gravity of the graphic from the location of the edge to be detected and a vector of the detection direction of the detection specification information, wherein,

according to a result of deciding by the detection direction decider, the condition determiner determines the light-dark change condition as that the image changes from a light section to a dark section when the detection direction of the detection specification information is toward inside with respect to the graphic, and determines the light-dark change condition as that the image changes from a dark section to a light section when the detection direction of the detection specification information is toward outside with respect to the graphic.

3. The image measuring apparatus according to claim 1, comprising:

a resolution setter configured to set resolution of digitized image data of the pattern image;

an image data preparer configured to prepare the image data of the pattern image with the resolution set by the resolution setter;

a light-dark value acquirer configured to acquire light-dark values of pixels located at a starting point and an ending point of the detection specification information in the image data prepared by the image data preparer; and

a judger configured to judge whether the light-dark values of the pixels acquired by the light-dark value acquirer are different, wherein,

the condition determiner, in a case where it is judged by the judger that the light-dark values of the pixels are different, determines the light-dark change condition as that the image changes from a light section to a dark section when the starting point is brighter than the ending point, and determines the light-dark change condition as that the image changes from a dark section to a light section when the starting point is darker than the ending point.

4. A computer program stored in a non-transitory computer-readable medium, for causing a computer to perform as:

a data displayer configured to display, on a display, a pattern image, based on closed area information of Gerber data of a measured object stored in a data memory;

an inputter that receives an input of a location of an edge to be detected a detection direction and a detection length;

a detection specification information displayer configured to display, on the display, detection specification information specifying the location of the edge to be detected, the detection direction and the detection length, by superimposing the detection specification information on the pattern image displayed on the display;

an image capturer configured to capture an image of an area corresponding to the detection specification information of the measured object, when the detection specification information is displayed on the display by the detection specification information displayer, by superimposing the detection specification information on the pattern image;

an edge detector configured to perform an edge detection of the location of the edge to be detected, with respect to data of the image captured by the image capturer, according to the detection direction and the detection length specified by the detection specification information, and according to a light-dark change parameter; and

a condition determiner configured to determine, by using the Gerber data, a light-dark change condition indicating whether the image changes from a light section to a dark section or from a dark section to a light section along the detection direction based upon the detection direction of the detection specification information, before the edge detector performs the edge detection,

wherein the edge detector performs the edge detection using the light-dark change condition determined by the condition determiner, as the light-dark change parameter.

5. A teaching method of an image measuring apparatus comprising:

storing, in a data memory, Gerber data containing closed area information of a measured object;

displaying, on a display, a pattern image based on the closed area information of the Gerber data;

receiving an input of a location of an edge to be detected a detection direction and a detection length;

displaying, on the display, detection specification information specifying the location of the edge to be detected, the detection direction and the detection length, by superimposing the detection specification information on the pattern image displayed on the display;

capturing an image of an area corresponding to the detection specification information of the measured object, when the detection specification information is displayed on the display by said displaying, on the display, detection specification information, by superimposing the detection specification information on the pattern image;

performing an edge detection of the location of the edge to be detected, with respect to data of the captured image, according to the detection direction and the detection length specified by the detection specification information, and according to a light-dark change parameter; and

determining, by using the Gerber data, a light-dark change condition indicating whether the image changes from a light section to a dark section or from a dark section to a light section along the detection direction based upon the detection direction of the detection specification information, before the edge detection is performed,

wherein in performing the edge detection, the determined light-dark change condition is used as the light-dark change parameter.