Image processor for detecting incomplete articles such as wiring harnesses

• US 5,121,439 A
• Filed: 08/14/1989
• Issued: 06/09/1992
• Est. Priority Date: 08/12/1988
• Status: Expired due to Term

• Current Assignee: Sumitomo Wiring Systems Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Wiring Systems Limited (Sumitomo Corporation)
• Inventors: Iida, Tsutomu, Abe, Kiyohide, Fukuda, Michio, Igura, Hiroshi, Kashihara, Isao, Takahashi, Tsuneyoshi, Ichikawa, Yoshihide
• Primary Examiner(s): Moore, David K.
• Assistant Examiner(s): Cammarata, Michael R.
• Application Number:
  US07/393,763
• Time in Patent Office: 1,030 Days
• Field of Search: 382/8, 382/18, 382/28, 358/101, 250/559, 250/561, 362/31, 242/129, 29/755, 29/705, 269/296, 269/903
• US Class Current: 382/141
• CPC Class Codes: G06T 2207/10016 Video; Image sequence
• CPC Class Codes: G06T 2207/30164 Workpiece; Machine component
• CPC Class Codes: G06T 7/0006 using a design-rule based approach
• CPC Class Codes: Y10S 269/903 Work holder for electrical circuit assemblages or wiring systems
• CPC Class Codes: Y10T 29/53022 with means to test work or product

Abstract

In an image processor for detecting incomplete articles the image of a complete article is produced by a television camera so as to record the image, and the operator designates an area of the complete article that is considered to be essential in judging whether or not the subject of the inspection is complete while observing the reproduced image. Following this, the image of an inspection article is produced by another television camera. The video signals are binarized, and the number of the picture elements of the inspection article within the designated area is then counted. The inspection article is judged as being incomplete when this counted value fails to conform to the reference value obtained by statistically processing the number of the picture elements of the complete article.

Claims

1. An apparatus for inspecting a candidate article for incompleteness, said apparatus comprising:

a support device for supporting a subject article and having a position compensating mark disposed thereon;

a camera device disposed above the support device for viewing the subject article and for outputting corresponding video signals;

window designation means for designating an area of inspection of the subject article and including a display device for displaying the video signals output by said camera device; and

,

image processing means for operating in either of a learning mode and an inspection mode;

wherein, in the learning mode, the subject article is a representative complete article and said image processor means includes

(1) means for binarizing the video signals output by said camera device from within the area of inspection designated by said window designation means to obtain binarized video signals,

(2) means for processing the binarized video signals to obtain a reference value, and

(3) means for determining a relative position between the position compensating mark and the area of inspection designated by said window designation means;

wherein, in the inspection mode, the subject article is the candidate article and said image processing means includes

(1) means for determining the area of inspection of the candidate article according to the relative position of the position compensating mark,

(2) means for binarizing the video signals output by said camera device from within the area of inspection designated by said window designation means to obtain binarized video signals,

(3) means for processing the thus binarized video signals to obtain a measurement value, and

(4) means for comparing the reference value obtained in the learning mode and the measurement value to determine that the candidate article is incomplete when a difference therebetween exceeds a threshold value.

2. An apparatus as recited in claim 1,

wherein, in the learning mode, said image processing means further includes means for counting a value of the binarized video signals and for computing and storing an average value and a standard deviation value of plural counted values of the binarized video signals, wherein the reference value is the average value, and

wherein, in the inspection mode, the threshold value is three times the standard deviation value.

3. An apparatus as recited in claim 1, further comprising:

support members disposed on the surface of said support device for supporting the candidate article at a distance above the surface of said support device;

illuminating members disposed at opposite sides of said support device, each of said illuminating members including a light source member and a hood member surrounding the light source member, the hood member directing light emitted by the light source member in a direction above and parallel to the surface of said support device to impinge on the candidate article supported above the surface of said support device.

4. An apparatus as recited in claim 2, further comprising:

support members disposed on the surface of said support device for supporting the candidate article at a distance above the surface of said support device;

illuminating members disposed at opposite sides of said support device, each of said illuminating members including a light source member and a hood member surrounding the light source member, the hood member directing light emitted by the light source member in a direction above and parallel to the surface of said support device to impinge on the candidate article supported above the surface of said support device.