Image measuring apparatus and non-temporary recording medium on which control program of same apparatus is recorded

Patent metadata

Field	Value
Publication number	US-9972095-B2
Application number	US-201615250313-A
Country	US
Kind code	B2
Filing date	Aug 29, 2016
Priority date	Aug 31, 2015
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

An image measuring apparatus according to an embodiment of the present invention comprises: an imaging device that images a workpiece to acquire an image of this workpiece; and a processing device that performs measurement of the workpiece based on this image and outputs a measurement result. Moreover, the processing device, based on the above-described image, generates another image whose number-of-pixels is smaller than that of the image, sets a plurality of regions based on this another image, and calculates the above-described measurement result based on these plurality of regions.

First claim

What is claimed is:

1. An image measuring apparatus, comprising:
an imaging device that images a workpiece to acquire an image of the workpiece; and
a processing device that performs measurement of the workpiece based on the image and outputs a measurement result,
the processing device
based on the image, generating another image whose number-of-pixels is smaller than that of the image,
setting a plurality of regions by segmenting one portion of the another image including pixels whose density levels are higher than a threshold value and another portion of the another image including pixels whose density levels are lower than the threshold value to different regions, and
calculating the measurement result based on the plurality of regions.

2. The image measuring apparatus according to claim 1 , wherein
the processing device performs edge detection along a contour line of the region to acquire an edge point group.

3. The image measuring apparatus according to claim 2 , wherein
the processing device excludes some of a plurality of edge points included in the edge point group.

4. The image measuring apparatus according to claim 3 , wherein
the processing device
sets an approximate straight line or an approximate curve in the edge point group,
calculates a distance from the approximate straight line or the approximate curve to the edge point, and
excludes some of the plurality of edge points based on a mean value and a variance of the calculated distances.

5. The image measuring apparatus according to claim 1 , wherein
the processing device sets a plurality of respectively different numbers for the plurality of regions.

6. The image measuring apparatus according to claim 4 , wherein
the processing device sets a plurality of respectively different numbers for the plurality of regions.

7. The image measuring apparatus according to claim 1 , wherein
the processing device
extracts one of the plurality of regions, and
calculates the measurement result based on the extracted regions.

8. A non-temporary recording medium which is computer-readable and has recorded thereon a control program of an image measuring apparatus,
the image measuring apparatus comprising:
an imaging device that images a workpiece to acquire an image of the workpiece; and
a processing device that performs measurement of the workpiece based on the image and outputs a measurement result,
the control program of the image measuring apparatus controlling the image measuring apparatus to perform calculation of the measurement result,
the control program, by the processing device,
based on the image, generating another image whose number-of-pixels is smaller than that of the image,
setting a plurality of regions by segmenting one portion of the another image including pixels whose density levels are higher than a threshold value and another portion of the another image including pixels whose density levels are lower than the threshold value to different regions, and
calculating the measurement result based on the plurality of regions.

9. The non-temporary recording medium according to claim 8 , wherein
the program, by the processing device, performs edge detection along a contour line of the region to acquire an edge point group.

10. The non-temporary recording medium according to claim 9 , wherein
the program, by the processing device, excludes some of a plurality of edge points included in the edge point group.

11. The non-temporary recording medium according to claim 10 , wherein
the program, by the processing device,
sets an approximate straight line or an approximate curve in the edge point group,
calculates a distance from the approximate straight line or the approximate curve to the edge point, and
excludes some of the plurality of edge points based on a mean value and a variance of the calculated distances.

12. The non-temporary recording medium according to claim 8 , wherein
the program, by the processing device, sets a plurality of respectively different numbers for the plurality of regions.

13. The non-temporary recording medium according to claim 8 , wherein
the program, by the processing device,
extracts one of the plurality of regions, and
calculates the measurement result based on the extracted regions.

14. An image measuring apparatus, comprising:
an imaging device that images a workpiece to acquire an image of the workpiece; and
a processing device that performs measurement of the workpiece based on the image and outputs a measurement result,
the processing device
based on the image, generating another image whose number-of-pixels is smaller than that of the image,
setting a plurality of regions based on the another image,
performing edge detection along a contour line of the region to acquire an edge point group,
excluding some of a plurality of edge points included in the edge point group,
setting an approximate straight line or an approximate curve in the edge point group,
calculating a distance from the approximate straight line or the approximate curve to the edge point,
excluding some of the plurality of edge points based on a mean value and a variance of the calculated distances, and
calculating the measurement result based on the plurality of regions.

15. The image measuring apparatus according to claim 14 , wherein
the processing device sets a plurality of respectively different numbers for the plurality of regions.

16. The image measuring apparatus according to claim 14 , wherein
the processing device
extracts one of the plurality of regions, and
calculates the measurement result based on the extracted regions.

Assignees

• Mitutoyo Corp

Inventors

• Kurihara Masaki

Classifications

• G06T2207/30164

  Workpiece; Machine component · CPC title

• G01B11/24

  for measuring contours or curvatures · CPC title

• G06T7/11 Primary

  Region-based segmentation · CPC title

• G06T7/12

  Edge-based segmentation · CPC title

• G06T7/62

  of area, perimeter, diameter or volume · CPC title