Acceleration-based motion tolerance and predictive coding

Patent metadata

Field	Value
Publication number	US-9652653-B2
Application number	US-201514944320-A
Country	US
Kind code	B2
Filing date	Nov 18, 2015
Priority date	Dec 27, 2014
Publication date	May 16, 2017
Grant date	May 16, 2017

Abstract

A method of predicting the location of a region of interest within an image of a scannable object comprising providing a scanner having a processor and an image sensor; sensing in a viewing direction toward a scannable object, with an imaging plane being perpendicular to the viewing direction; capturing an image of the scannable object with the image sensor; sensing motion of the scanner within a motion sensor plane relative to the scannable object, the motion sensor plane being parallel to the imaging plane; outputting a velocity and a movement direction corresponding to the velocity; locating a region of interest in said captured image in response to the velocity and the movement direction; and scanning the captured image beginning with the region of interest.

First claim

What is claimed is:

1. A method of predicting the location of a region of interest within an image of a scannable object, the method comprising the steps of:
providing a scanner having a processor and an image sensor;
sensing in a viewing direction toward a scannable object, with an imaging plane being perpendicular to the viewing direction;
setting a gain and an exposure time for the image sensor;
capturing an image of the scannable object with the image sensor;
sensing motion of the scanner within a motion sensor plane relative to the scannable object, the motion sensor plane being parallel to the imaging plane, and when motion is detected, either increasing the gain or lowering the exposure time;
outputting a velocity and a movement direction corresponding to the velocity;
locating a region of interest in said captured image in response to the velocity and the movement direction; and
scanning the captured image beginning with the region of interest.

2. The method of claim 1 , wherein the step of locating the region of interest further comprises:
when no motion is detected, locating the region of interest in the center of the captured image; and
when motion is detected, locating the region of interest in an offset direction from the center of the captured image and towards an edge of the captured image, with the offset direction being substantially parallel to the movement direction.

3. The method of claim 2 , wherein the step of locating the region of interest further comprises:
when motion is detected, locating the region of interest at an offset distance measured from the center of the image, the offset distance being proportional to the velocity.

4. The method of claim 1 , further comprising the steps of:
providing a light source;
configuring the light source to direct light in the viewing direction;
configuring the light source to be selectively in one of: a deactivated state, and an activated state; and
activating the light source when motion is detected.

5. The method of claim 2 , further comprising the steps of:
providing a light source;
configuring the light source to direct light in the viewing direction;
configuring the light source to be selectively in one of: a deactivated state, and an activated state; and
activating the light source when motion is detected.

6. The method of claim 3 , further comprising the steps of:
providing a light source;
configuring the light source to direct light in the viewing direction;
configuring the light source to be selectively in one of: a deactivated state, and an activated state; and
activating the light source when motion is detected.

7. The method of claim 1 , further comprising the steps of:
defining an imaging distance corresponding to the distance between the image sensor and the scannable object;
defining an exposure time for the image sensor; and
estimating the velocity based on the exposure time and the imaging distance.

8. The method of claim 2 , further comprising the steps of:
defining an imaging distance corresponding to the distance between the image sensor and the scannable object;
defining an exposure time for the image sensor; and
estimating the velocity based on the exposure time and the imaging distance.

9. The method of claim 3 , further comprising the steps of:
defining an imaging distance corresponding to the distance between the image sensor and the scannable object;
defining an exposure time for the image sensor; and
estimating the velocity based on the exposure time and the imaging distance.

10. The method of claim 2 , further comprising the step of:
setting a gain and an exposure time for the image sensor; and
when motion is detected, either increasing the gain or lowering the exposure time.

11. The method of claim 3 , further comprising the step of:
setting a gain and an exposure time for the image sensor; and
when motion is detected, either increasing the gain or lowering the exposure time.

12. The method of claim 1 , wherein the step of sensing motion further comprises:
capturing at least two images of the scannable object, the at least two images being separated by a time interval; and
determining movement direction and velocity by measuring a distance traveled by the scannable object between the at least two images.

13. The method of claim 2 , wherein the step of sensing motion further comprises:
capturing at least two images of the scannable object, the at least two images being separated by a time interval; and
determining movement direction and velocity by measuring a distance traveled by the scannable object between the at least two images.

14. The method of claim 3 , wherein the step of sensing motion further comprises:
capturing at least two images of the scannable object, the at least two images being separated by a time interval; and
determining movement direction and velocity by measuring a distance traveled by the scannable object between the at least two images.

15. The method of claim 1 , wherein the step of sensing motion further comprises:
capturing at least an image of the scannable object; and
determining movement direction and velocity by measuring a blurred area of a scannable object in an image.

16. The method of claim 2 , wherein the step of sensing motion further comprises:
capturing at least an image of the scannable object; and
determining movement direction and velocity by measuring a blurred area of a scannable object in an image.

17. The method of claim 3 , wherein the step of sensing motion further comprises:
capturing at least an image of the scannable object; and
determining movement direction and velocity by measuring a blurred area of a scannable object in an image.

Assignees

• Hand Held Prod Inc

Inventors

• Todeschini Erik
• Ledwith James

Classifications

• G06K7/1093

  sensing, after transfer of the image of the data-field to an intermediate store, e.g. storage with cathode ray tube · CPC title

• G06K7/1443 Primary

  locating of the code in an image · CPC title

• G06K7/10 Primary

  by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation · CPC title

• G06K7/10722

  Photodetector array or CCD scanning · CPC title

• G06K7/1408

  the method being specifically adapted for the type of code · CPC title