Multi-sheet handling for document digitization
Systems and methods are provided for document handling. Non-vision detection systems may be capable of detecting the dimensions, orientation, and/or position of a single sheet, or multiple stacked sheets. A document scanning arrangement may be capable of double sided scanning for sheets with various characteristics. The systems and methods provided may accommodate high throughput and rapid digitization of various types of documents, at a high quality.
1. A method of measuring a characteristic of a sheet, said method comprising:
a) providing a plurality of sheet sensors over an automated conveyance mechanism;
b) detecting, with aid of the plurality of sheet sensors, a timing of when the sheet is positioned under the plurality of sheet sensors at a given time while traversing the automated conveyance mechanism; and
c) calculating, with aid of one or more processors, one or more properties of the sheet selected from the group consisting of: width, length, thickness, diagonal, perimeter, dimensions, position, and orientation of the sheet, based at least partially on the detection of the timing of when the sheet is positioned under each sensor in the plurality of sheet sensors.
2. The method of claim 1 , wherein the plurality of sheet sensors is stationary relative to an inertial reference frame.
3. The method of claim 1 , wherein the plurality of sheet sensors are positioned above the automated conveyance mechanism to face a side of the sheet that is exposed when conveyed by the automated conveyance mechanism.
4. The method of claim 1 , wherein the plurality of sheet sensors are fiberoptic sensors.
5. The method of claim 1 , wherein a given sheet sensor of the plurality of sheet sensors is configured to provide one of a binary signal, wherein a first signal is indicative of a presence of the sheet traversing a detection zone of the given sheet sensor, and a second signal is indicative of an absence of the sheet traversing the detection zone of the given sheet sensor.
6. The method of claim 5 , wherein detecting the timing comprises detecting a duration of the first signal.
7. The method of claim 1 , further comprising calculating the dimensions, position, or orientation of a second sheet adjacent to the sheet, wherein the plurality of sheet sensors are double sheet sensors.
8. The method of claim 1 , wherein the plurality of sheet sensors are non-vision sensors.
9. The method of claim 1 , wherein (b) further comprises detecting the timing at a plurality of given times.
10. The method of claim 1 , wherein (b) further comprises detecting a second timing of when the sheet is not positioned under the plurality of sheet sensors at a second given time while traversing the automated conveyance mechanism.
11. The method of claim 1 , wherein the calculating is based at least partially on a velocity of the sheet traversing the automated conveyance mechanism.
12. A system for measuring a characteristic of a sheet, said method comprising:
an automated conveyance mechanism configured to convey a sheet;
a plurality of sheet sensors disposed over the automated conveyance mechanism, wherein the plurality of sheet sensors are configured to detect a timing of when the sheet is positioned under the plurality of sheet sensors at a given time while traversing the automated conveyance mechanism; and
one or more processors configured to, based at least in part on detection of the timing of when the sheet is positioned under each sensor in the plurality of sheet sensors, determine one or more characteristics of the sheet selected from the group consisting of: a width, length, thickness, diagonal, perimeter, dimension, position, and orientation of the sheet.
13. The system of claim 12 , wherein the plurality of sheet sensors are arranged in a plurality of substantially linear rows, as an array, or a plurality of staggered rows.
14. The system of claim 12 , wherein the automated conveyance mechanism comprises vacuum air flow configured to provide adhesive forces between a conveyor belt and the sheet.
15. The system of claim 12 , wherein at least a subset of the plurality of sheet sensors is positioned to encounter different portions along a length or width or both of the sheet as the sheet is conveyed across the plurality of sheet sensors.
16. The system of claim 12 , wherein a sheet sensor of the plurality of sheet sensors is configured to provide one of a binary signal, wherein a first signal of the binary signal is indicative of a presence of the sheet traversing a detection zone of the sheet sensor, and a second signal of the binary signal is indicative of an absence of the sheet traversing the detection zone of the sheet sensor, wherein the detection of the timing comprises detection of a duration of the first signal.
17. The system of claim 12 , wherein the plurality of sheet sensors are further configured to detect a second timing of when the sheet is not positioned under the plurality of sheet sensors at a second given time while traversing the automated conveyance mechanism.
18. The system of claim 12 , wherein the one or more processors are further configured to determine one or more characteristics of the sheet based at least partially on a velocity of the sheet traversing the automated conveyance mechanism.
19. The system of claim 12 , wherein the plurality of sheet sensors are further configured to detect the timing at a plurality of given times.
20. The system of claim 12 , wherein the plurality of sheet sensors are non-vision sensors.