Automated vision inspection of a side curtain airbag assembly

• US 9,242,615 B2
• Filed: 10/04/2013
• Issued: 01/26/2016
• 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:
  US14/046,142
• Publication Number:
  US 20140099016A1
• Time in Patent Office: 844 Days
• Field of Search: 382/141, 382/149, 382/152, 382/209, 382/278, 348/86, 348/92, 348/94
• 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 sleeve covering the cushion of a side cushion airbag assembly, each marking being defined by a pair of stacked indicia, each indicium of the pair of stacked indicia defined by a plurality of polygonal shaped pixels;

a detector configured to capture digital images of the plurality of markings; and

a controller configured to process the digital images captured by the detector and to determine presence of the indicia of the plurality of markings to assess an installed condition of the cushion or sleeve by comparison of the digital images to master images.

2. The system of claim 1, wherein each of an upper indicium and a lower indicium of the pair of stacked indicia of each marking is formed from a plurality of similarly shaped and sized interconnected pixels having non-intermeshing edges.

3. The system of claim 1, wherein each marking of the plurality of markings is defined by a first upper row of indicia and a second lower row of indicia.

4. The system of claim 3, wherein the first row of indicia is defined by a first indicium, a second indicium located adjacent the first indicium, a third indicium located adjacent the second indicium and a fourth indicium located adjacent the third indicium, each indicium having a differing shape and being formed from a plurality of similarly shaped and sized interconnected pixels, wherein the second row of indicia is identical to the first row of indicia.

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 4, wherein the controller is configured to detect edges of each marking to determine the orientation of the marking on the sleeve or cushion, and wherein the plurality of pixels defining each indicium have non-intermeshing edges, the controller configured to detect the non-intermeshing edges of the plurality of pixels.

7. The system of claim 6, wherein the controller is configured to determine a match percentage of the pixels defining the edges of each indicium or of the pixels within the area inscribed by the edges of the indicia as compared to the same pixels of the master images, and

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

8. The system of claim 6, wherein at least one master image is an image of one of the markings and includes an indicia box having a defined area for receiving one of the first row of indicia, the second row of indicia, and a portion of each of the first row and second row of indicia of the marking, the indicia box providing for secondary markings and the controller being configured to determine presence of the secondary markings on the captured images.

9. The system of claim 8, wherein each of the first row of indicia and the second row of indicia is defined by respective rows of pixels, and the indicia box is movable by at least one row of pixels downward from the first row of indicia to the second row of indicia.

10. The system of claim 6, wherein at least one master image is an image of a first marking and an adjacent second marking of the plurality of markings, and the master images includes an indicia box having a defined area for receiving one of the first row of indicia of the first marking, the second row of indicia of the first marking, at least one indicium of the first row of indicia of the first marking and at least one indicium the first row of indicia of the second marking, and at least one indicium of the second row of indicia of the first marking and at least one indicium the second row of indicia of the second marking, the indicia box providing for secondary markings and the controller being configured to determine presence of the secondary markings on the captured images.

11. The system of claim 10, wherein the indicia box is movable by at least one indicium from one of the first and second rows of indicia of the first marking to one of the corresponding first and the second rows of indicia of the second marking.

12. The system of claim 1, further including at least one zone marker provided on one of the cushion or the sleeve, the at least one zone marker separating the side cushion airbag assembly into at least two zones, each zone at least one marking of the plurality of markings, the detector configured to capture digital images of the at least one marking in each zone, the controller configured to access an installed condition of each zone of the cushion or sleeve by comparison of the digital images to the master images.

13. The system of claim 12, wherein the zone marker is defined by at least one indicium having a shape different than a shape of each indicium of the pair of stacked indicia.

14. The system of claim 13, wherein, the zone marker is defined by a first indicium, a second indicium located adjacent to the first indicium and a third indicium located adjacent to the first indicium, each indicium having a differing shape.

15. The system of claim 14, wherein the third indicium is an ambigram of the first indicium.