System and method of border detection on a document and for producing an image of the document

• US 9,729,744 B2
• Filed: 12/21/2015
• Issued: 08/08/2017
• Est. Priority Date: 12/21/2015
• Status: Active Grant

• Current Assignee: Hand Held Products Incorporated (Honeywell International Inc.)
• Original Assignee: Hand Held Products Incorporated (Honeywell International Inc.)
• Inventors: Nguon, Robert, Lundberg, Justin, Swanson, Eric R.
• Primary Examiner(s): REINIER, BARBARA DIANE
• Application Number:
  US14/975,939
• Publication Number:
  US 20170180577A1
• Time in Patent Office: 596 Days
• CPC Class Codes: H04N 1/00726 Other properties of the sheet, e.g. curvature or reflectivity
• CPC Class Codes: H04N 1/00734 Optical detectors
• CPC Class Codes: H04N 1/00753 of a sheet relative to a particular backgroud
• CPC Class Codes: H04N 1/00779 Adjusting settings, e.g. mode, feeding rate or type of paper
• CPC Class Codes: H04N 1/3873 defined only by a limited number of coordinate points or parameters, e.g. corners, centre; for trimming
• CPC Class Codes: H04N 1/4092 Edge or detail enhancement
• CPC Class Codes: H04N 1/60 Colour correction or control H04N1/54 takes precedence
• CPC Class Codes: H04N 1/6077 Colour balance, e.g. colour cast correction

Abstract

A system of border detection on a document and for producing an image of the document is provided. In an exemplary embodiment, the system comprises: a frequency specific reflective border on the document; an image capture device; a filter tuned to the frequency of the reflective border; a border detection algorithm; and a processor communicatively linked to the image capture device, to the notch filter, and to the border detection algorithm. The image capture device is configured to capture an image of the document. The processor is configured to apply the filter to the captured image and to produce a second frame. The processor is further configured to apply the border detection algorithm to the second frame to determine a document border mask. The processor is further configured to apply the border mask to the captured image to produce a document image.

Claims

1. A system of border detection on a document and for producing an image of the document, comprising:

a frequency specific reflective border on the document;

an image capture device;

a filter tuned to the frequency of the reflective border;

a border detection algorithm;

a processor communicatively linked to the image capture device, and to the filter;

the image capture device being configured to capture an image of the document;

the processor being configured to apply the filter to the captured image and to produce a second frame;

the processor being further configured to apply the border detection algorithm to the second frame to determine a document border mask; and

the processor being further configured to apply the border mask to the captured document image to produce a document image.

2. The system of claim 1, further comprising:

image correction software communicatively linked to the processor;

the processor being configured to apply the image correction software to the document image.

3. The system of claim 2, wherein the image correction software is selected from Keystone correction, white balance, image distortion correction, image skew correction, image blur correction, and combinations thereof.

4. The system of claim 1, wherein the frequency specific reflective border is printed with reflective ink.

5. The system of claim 1, wherein the frequency specific reflective border reflects a frequency within the visible spectrum.

6. The system of claim 1, wherein the frequency specific reflective border reflects a frequency outside of the visible spectrum.

7. The system of claim 1, wherein the processor is selected from a central processing unit, a graphics processing unit, a digital signal processor, and a field programmable gate array.

8. The system of claim 1, wherein the filter is selected from a bandpass filter and a notch filter.

9. A method for document capture with border detection, comprising:

providing a border with a reflective specified frequency on a document to be captured;

capturing an image of the document using an image capture device;

applying a filter tuned to the frequency of the border to the captured image;

producing a second frame after applying the filter;

applying a border detection algorithm to the second frame to determine a document border mask; and

applying the border mask to the captured image to produce a document image.

10. The method of claim 9, further comprising the steps of:

applying Keystone correction to the document image;

applying white balance correction to the document image; and

applying image distortion corrections to the document image.

11. The method of claim 9, wherein the applying a filter step is accomplished with a filter selected from a bandpass filter and a notch filter.