Pattern recognition system and method for monitoring hand washing or application of a disinfectant

• US 6,970,574 B1
• Filed: 03/12/2002
• Issued: 11/29/2005
• Est. Priority Date: 03/13/2001
• Status: Active Grant

• Current Assignee: Raymond C. Johnson
• Original Assignee: Raymond C. Johnson
• Inventors: Johnson, Raymond C.
• Primary Examiner(s): Mehta, Bhavesh M.
• Assistant Examiner(s): AZARIAN, SEYED H
• Application Number:
  US10/096,061
• Time in Patent Office: 1,358 Days
• Field of Search: 382/100, 382/103, 382/107, 382/108, 382/115, 382/151, 382/163, 382/173, 382/178, 382/180, 382/209, 382/237, 382/274, 382/312, 382/321, 382/118, 382/305, 348/143, 348/619, 134 57 R- 58 R, 134/18, 340/573.1, 356/73, 702/127, 222/1, 604/289, 604/290
• US Class Current: 382/100
• CPC Class Codes: G06V 40/20 Movements or behaviour, e.g. gesture recognition recognition of facial expressions G06V40/16

Abstract

A system and method for monitoring hand washing or application of a disinfectant wherein a pattern recognition algorithm executed in a computer compares one or more digitized images of a person going through hand washing or disinfectant application motions with a reference set of images and creates a pass/fail report. The digitized image may be taken by a video camera and color quantified to reduce the amount of computing power required before clusters of pixels with similar color classifications are determined and shapes identified.

Claims

1. A system for monitoring hand washing or spreading a disinfectant on a user'"'"'s hands comprising

a soap, detergent or disinfectant dispenser for applying soap, detergent or disinfectant to a user'"'"'s hands,

an optical input device in front of which a user places his or her hands after the dispenser has applied soap, detergent or disinfectant while the user goes through a set of motions of washing or spreading the disinfectant over his or her hands, said input device recording one or more optical images of the user'"'"'s hands while he or she is going through said set of motions,

a device for digitizing each of the optical images into a digitized image,

a computer having an input for the digitized image and an output for a report,

a set of reference optical images taken of the user or of another person going through a set of motions for effective hand washing or spreading of a disinfectant, said reference optical images digitized into a set of reference digitized images and present in the computer,

a pattern recognition algorithm executed in the computer that compares each digitized image of the user'"'"'s hands with the reference set of digitized images to determine whether the user'"'"'s images match the reference images to a predetermined level that indicates effective hand washing or disinfectant spreading, and creates a report sent through the output.

2. The system of claim 1 further comprising a device for identifying the user as he or she approaches the soap dispenser.

3. The system of claim 1 wherein the optical input device is a 24-bit RGB video camera and the digitized image is color quantified into 8 to 50 color classes.

4. The system of claim 3 wherein clusters of pixels with similar color classifications are determined and shapes identified.

5. The system of claim 4 wherein the algorithm is a trained pattern recognition algorithm.

6. A method for monitoring hand washing or spreading a disinfectant on a user'"'"'s hands comprising

having a user place his or her hands in front of a soap, detergent or disinfectant dispenser for applying a soap, detergent or disinfectant to the user'"'"'s hands,

having the user place his or her hands in front of an optical input device after the dispenser has applied soap, detergent or disinfectant while the user goes through a set of motions of washing or spreading the disinfectant over his or her hands, said input device recording one or more optical images of the user'"'"'s hands while he or she is going through said set of motions,

digitizing each of the optical images into a digitized image,

executing a pattern recognition algorithm in a computer having an input for the digitized image and an output for a report, said computer having a digitized set of reference optical images taken of the user or of another person going through a set of motions for effective hand washing or spreading of a disinfectant, said pattern recognition algorithm comparing each digitized image of the user'"'"'s hands with the reference set of digitized images to determine whether the user'"'"'s images match the reference images to a predetermined level that indicates effective hand washing or disinfectant spreading and creating a report sent through the output.

7. The method of claim 6 further comprising identifying the user as he or she approaches the soap, detergent or disinfectant dispenser.

8. The method of claim 6 wherein the optical input device is a 24-bit RGB video camera and the digitized image is color quantified into 8 to 50 color classes.

9. The method of claim 8 wherein clusters of pixels with similar color classifications are determined and shapes identified.

10. The method of claim 9 wherein the algorithm is a trained pattern recognition algorithm.