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 Title: |
US5581625:
Stereo vision system for counting items in a queue
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Connell, Jonathan H.; Cortlandt-Manor, NY
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| Assignee: |
International Business Machines Corporation, Armonk, NY
other patents from INTERNATIONAL BUSINESS MACHINES CORPORATION (280070) (approx. 44,393)
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| Published / Filed: |
1996-12-03
/ 1994-01-31
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| Application Number: |
US1994000189561
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| IPC Code: |
Advanced:
G06K 9/00;
G06M 7/00;
G06T 1/00;
G07C 9/00;
G07C 11/00;
H04N 13/00;
Core:
more...
IPC-7:
G06K 9/00;
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| ECLA Code: |
G06K9/00V4; G07C9/00; G07C11/00; H04N13/00S2A2; H04N13/00S8D; T04N13/00S2A2; T04N13/00S8D;
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| U.S. Class: |
Current:
382/100;
348/042;
348/139;
348/142;
348/143;
348/E13.014;
356/003;
356/012;
359/458;
359/462;
359/466;
359/468;
382/106;
382/154;
Original:
382/001;
382/106;
382/154;
348/042;
348/139;
348/142;
348/143;
356/003;
356/012;
359/462;
359/458;
359/466;
359/468;
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| Field of Search: |
382/001,106,154
250/341.1,306
358/088,108
365/005
128/664
356/003,12
359/462,458,466,468
348/139,142,42,51,135,154,143
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| Priority Number: |
| 1994-01-31 |
US1994000189561 |
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| Abstract: |
A number of items present in a substantially linear queue are counted by examining two images of a scene including the queue that are taken from vantage points offset relative to each other. Depth information for portions of the scene is obtained by correlating equal sized patches in the images at a predetermined number of offsets, since closer objects will require more of an offset to align one image relative to the other than objects further away from video cameras creating the two images. A match score is determined at each offset. The best offset and the number of offsets to achieve it are stored for each patch. A plot is then created for offsets versus the number of patches at each offset having the best match. Peaks in the plot indicate the number of objects in the queue.
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| Attorney, Agent or Firm: |
Heslin & Rothenberg, P.C. ;
Reinke, Wayne F. ;
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| Primary / Asst. Examiners: |
Couso, Jose L.; Do, Anh Hong
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| Maintenance Status: |
E3 Expired Check current status
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Family: |
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First Claim:
Show all 30 claims |
I claim:
1. A method for counting a plurality of objects currently present in a substantially linear queue, comprising:
- obtaining a stereo image of a scene including said substantially linear queue from a vantage point area in close proximity to one end of said substantially linear queue, wherein said stereo image comprises a first image and a second image, each of said plurality of objects in said first image being shifted relative to said second image;
- obtaining depth information from said stereo image for portions of said scene relative to said vantage point, comprising correlating patches in said first image with patches in said second image; and
- interpreting said depth information to determine areas of said stereo image substantially corresponding to a given depth range, each of said plurality of objects corresponding to a particular determined area, wherein said step of interpreting comprises:
- creating a depth map for said correlated patches,
- interpreting said depth map to identify one or more regions corresponding to said given depth range, each of said plurality of objects corresponding to one of said one or more regions, and
- filtering out said depth information for objects in said scene other than said plurality of objects.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 36 U.S. patent(s) that reference this one
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