Handheld Article with Movement Discrimination

• US 20080231713A1
• Filed: 03/25/2007
• Published: 09/25/2008
• Est. Priority Date: 03/25/2007
• Status: Active Grant

• Current Assignee: FotoNation Limited (Adeia, Inc.)
• Original Assignee: FotoNation Vision Limited (Adeia, Inc.)
• Inventors: Zamfir, Adrian, Florea, Corneliu, Drimbarean, Alexandru, Albu, Felix
• Granted Patent: US 7,773,118 B2
• Time in Patent Office: Days
• US Class Current: 348/208.2
• CPC Class Codes: G03B 17/00 Details of cameras or camera bodies; Accessories therefor lens hoods or caps G03B11/04
• CPC Class Codes: H04N 23/68 for stable pick-up of the scene, e.g. compensating for camera body vibrations

Abstract

A digital camera has a pair of angular rate-sensing gyroscopic sensors with mutually perpendicular axes and an electronic circuit responsive to the sensor output signals to discriminate between voluntary and involuntary movements of the article as a function of the number of zero crossings per unit time of the signal and the average of the absolute amplitude of the signal.

Claims

1. A handheld article having at least one angular rate-sensing gyroscopic sensor and an electronic circuit responsive to the sensor output signal to discriminate between voluntary and involuntary movements of the article as a function of the number of zero crossings per unit time of the signal and the average of the absolute amplitude of the signal.

2. An article as claimed in claim 1, including first and second angular rate-sensing gyroscopic sensors with transverse axes, the electronic circuit being responsive to both sensor output signals to discriminate between voluntary and involuntary movements of the article.

3. An article as claimed in claim 2, wherein the axes of the first and second angular rate-sensing gyroscopic sensors are substantially perpendicular to one another.

4. An article as claimed in claim 1, 2 or 3, wherein the function is proportional to the number of zero crossings of each signal and inversely proportional to the average of the absolute amplitude of each signal.

5. An article as claimed in claim 3, wherein the electronic circuit discriminates between the voluntary and involuntary movements by determining whether the function

NZC₁/|W|₁+NZC₂/|W|₂

exceeds a predetermined threshold, where NZC₁ and NZC₂ are the number of zero crossings per unit time for the output signals from the first and second sensors respectively, and |W|₁ and |W|₂ are the averages of the absolute amplitude of the output signals from the first and second sensors respectively.

6. An article as claimed in claim 3, wherein the electronic circuit further discriminates between involuntary movements and sensor noise by determining whether the said function falls below a second predetermined threshold less than the first threshold.

7. An article as claimed in any preceding claim, wherein the article is a digital camera.

8. An article as claimed in claim 7 wherein the camera is provided with image processing software responsive to said circuit indicating either voluntary and involuntary movement to control the processing of said image accordingly.

9. An article as claimed in claim 8 wherein said image processing software comprises face detection software which is operable in the absence of said circuit indicating voluntary movement.

10. An article as claimed in claim 8 wherein said image processing software comprises de-blur software which is operable in the absence of said circuit indicating voluntary movement.