Automated vision inspection of a side curtain airbag assembly

• US 9,376,079 B2
• Filed: 10/04/2013
• Issued: 06/28/2016
• Est. Priority Date: 10/04/2012
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Adams, James Wesley, Bacon, Alec Peter
• Primary Examiner(s): Kassa, Yosef
• Application Number:
  US14/046,038
• Publication Number:
  US 20140099015A1
• Time in Patent Office: 998 Days
• Field of Search: 382/141, 382/149, 382/151, 382/152, 382/209, 382/278, 382/291, 348/86, 348/95
• US Class Current: 1/1
• CPC Class Codes: B60R 2021/21543 with emblems
• CPC Class Codes: B60R 21/20 Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
• CPC Class Codes: B60R 21/213 in vehicle roof frames or pillars
• CPC Class Codes: B60R 21/215 characterised by the covers for the inflatable member B60R21/2176 takes precedence
• CPC Class Codes: B60R 21/23 Inflatable members B60R21/18 takes precedence; connection to inflation fluid source retainers B60R21/217
• CPC Class Codes: B60R 21/232 Curtain-type airbags deploying mainly in a vertical direction from their top edge
• CPC Class Codes: G06T 2207/10004 Still image; Photographic image
• CPC Class Codes: G06T 2207/30124 Fabrics; Textile; Paper
• CPC Class Codes: G06T 2207/30208 Marker matrix
• CPC Class Codes: G06T 7/0004 Industrial image inspection
• CPC Class Codes: G06T 7/001 using an image reference approach

Abstract

An automated vision inspection system detects whether a cushion of a side curtain airbag assembly system is twisted. The cushion is provided a plurality of markings arrayed along a longitudinal extent of the cushion. Each marking can be defined by a group of four distinct characters or indicia. Each indicium can be defined by polygonal shaped pixels which allow the inspection system to find clear edges of the marking and thereby determine marking orientation. By determining orientation, the inspection system can compare the inspected marking to a master image of the marking to determine if the cushion is in a twisted state or non-twisted state.

Claims

1. An automated vision inspection system for detecting whether a cushion of a side curtain airbag assembly system is in a properly installed or twisted state, the system comprising:

a plurality of markings arrayed along a longitudinal extent of one of a cushion or a sock covering the cushion of a side cushion airbag assembly, each marking including at least one indicium defined by a plurality of polygonal shaped pixels;

a detector configured to capture digital images of the at least one indicium of the plurality of markings; and

a controller configured to process the digital images captured by the detector and determine presence of the at least one indicium of the plurality of markings to access an installed condition of the cushion or sock by comparison of the digital images to master images,

wherein each marking of the plurality of markings is defined by at least two indicia including a first indicium and a second indicium different than the first indicium.

2. The system of claim 1, wherein the markings of the at least two indicia are arrayed in a repeating manner along the longitudinal extent of the cushion or sock.

3. The system of claim 2, wherein each of the first indicium and second indicium is formed from a plurality of similarly shaped and sized interconnected pixels which together provide for first and second indicia having a predetermined height and width, and a predetermined spacing between adjacent markings is greater than a predetermined spacing between the first indicium and second indicium of each marking.

4. The system of claim 2, wherein each marking of the plurality of markings is further defined by a third indicium located adjacent the second indicium and a fourth indicium located adjacent the third indicium, each indicium having a differing shape.

5. The system of claim 4, wherein the third indicium is an ambigram of the second indicium and the fourth indicium is an ambigram of the first indicium.

6. The system of claim 2, wherein each marking of the plurality of markings is separable into at least two secondary markings, and the controller is configured to determine presence of each secondary marking and compare each detected secondary marking to the master images of the plurality of markings which include master images of the at least two secondary markings defined by each marking.

7. The system of claim 6, wherein the first indicium is separable into a first upper portion and a first lower portion and the second indicium is separable into a second upper portion and a second lower portion, the second upper and lower portions differing in shape from the first upper and lower portions, the first and second upper portions defining an upper secondary marking, the first and second lower portions defining a lower secondary marking.

8. The system of claim 2, wherein the controller is configured to detect edges of each marking to determine the orientation of the marking on the sock or cushion, wherein edges of the first indicium do not match edges of the second indicium in each marking.

9. The system of claim 8, wherein the plurality of pixels defining each of the first indicium and second indicium have non-intermeshing edges, the controller configured to detect the non-intermeshing edges of the plurality of pixels to reduce error during the automated inspection of the cushion or sock.

10. The system of claim 8, wherein the controller is configured to determine a match percentage of the pixels defining the edges of the first and second indicia or of the pixels within the area inscribed by the edges of the first and second indicia as compared to the same pixels of the master images, and

the controller is configured to pixelate a perimeter of each of the first indicium and the second indicium to generate pixelated perimeters and compare the pixilated perimeters with the master images.

11. The system of claim 1, wherein the controller is configured to measure the distance between adjacent markings and count occurrences of the marking along the length of the cushion or sock to access the installed condition of the side cushion airbag assembly.

12. The system of claim 1, wherein a contrast of the at least one indicium and a contrast of the material of the cushion or sock having the at least one indicium printed thereon under white light has a minimum contrast separation of about 120 shades of grey on a standard grey scale having a range of 0 (black) to 255 (white).