Method for processing physical document images

• US 10,372,979 B1
• Filed: 05/24/2017
• Issued: 08/06/2019
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Arcasearch Corporation
• Original Assignee: Arcasearch Corporation
• Inventors: Walker, James R., Sixta, Calvin G.
• Primary Examiner(s): Shah, Utpal D
• Application Number:
  US15/604,411
• Time in Patent Office: 804 Days
• CPC Class Codes: G06T 5/70 Denoising; Smoothing
• CPC Class Codes: H04N 1/0066 Aligning or positioning related to handling
• CPC Class Codes: H04N 1/1061 Details relating to flat picture-bearing surfaces, e.g. transparent platen
• CPC Class Codes: H04N 1/1065 Support or mounting of the flat picture-bearing surface
• CPC Class Codes: H04N 1/19594 using a television camera or a still video camera
• CPC Class Codes: H04N 2201/0434 specially adapted for scanning pages of a book

Abstract

A method for performing image processing of a physical document image. The method may include receiving an image file including an image of a physical document and a control target. The method may include measuring control target attributes of the control target. Measuring the control target attributes of the control target may include numerically measuring a degree of focus of the image file based on the control target. The method may include performing a static crop of the image file based on the control target attributes by removing the control target from the image file to create a cropped image.

Claims

1. A method for performing image processing of a physical document image, comprising:

receiving an image file comprising an image of a physical document and at least one control target;

measuring control target attributes of the at least one control target, wherein measuring the control target attributes of the at least one control target includes;

numerically measuring a degree of focus of the image file based on the at least one control target, wherein numerically measuring the degree of focus of the image file based on the at least one control target comprises;

determining a location of a light-dark pattern area of the at least one control target;

determining pixel values of the light-dark pattern area;

determining a ratio of dark to light pixels for each of a plurality of segments of the light-dark pattern area;

determining which of the plurality of segments of the light-dark pattern area exceed a predetermined dark-to-light pixel ratio threshold; and

determining the degree of focus based on a number of segments that exceed the predetermined dark-to-light pixel ratio threshold; and

performing a static crop of the image file based on the control target attributes by removing the at least one control target from the image file to create a cropped image.

2. The method of claim 1, further comprising:

receiving the image file from an imaging station.

3. The method of claim 2, wherein the imaging station comprises a book imaging station.

4. The method of claim 2, wherein the imaging station comprises a microfiche card imaging station.

5. The method of claim 2, wherein the imaging station comprises an imaging station which includes a vacuum assembly.

6. The method of claim 1, wherein the at least one control target comprises at least one control strip.

7. The method of claim 6, wherein the light-dark pattern area comprises a light-dark pattern bar.

8. The method of claim 1, wherein the light-dark pattern area includes light pixel areas and dark pixel areas, wherein sizes of the light pixel areas and the dark pixel areas progressively decrease from one side of the light-dark pattern area to an opposite side of the light-dark pattern area.

9. The method of claim 8, wherein each of the plurality of segments of the light-dark pattern area include a geometrically similar repeating pattern of the light pixel areas and the dark pixel areas.

10. The method of claim 1, wherein the image comprises a bitonal image.

11. The method of claim 1, further comprising:

determining whether the numerically measured degree of focus is acceptable based upon a predetermined focus threshold value.

12. The method of claim 11, further comprising:

upon a determination that the numerically measured degree of focus is unacceptable, adjusting a lens focus of a camera of an imaging station and recapturing the image of the physical document and the at least one control target.

13. The method of claim 1, wherein the image file is a raw image file.

14. The method of claim 13, further comprising:

creating an image copy of the raw image file; and

converting the image copy to a bitonal format.

15. The method of claim 14, further comprising:

verifying that the at least one control target is present in the image copy.

16. The method of claim 1, further comprising:

creating a cropped image copy of the cropped image;

measuring a background color of a background of the cropped image copy upon creating the copy of the cropped image, wherein the background is separate from a live document portion of the cropped image copy;

selecting contiguous background color pixels of the background based upon the measured background color; and

creating a mask based at least on the selected contiguous background color pixels.

17. The method of claim 16, further comprising:

creating a temporary quality control thumbnail file, a temporary metadata thumbnail file, and a high resolution archive file based at least on the created mask.

18. The method of claim 17, further comprising:

performing a quality control process on the temporary quality control thumbnail file.

19. The method of claim 17, further comprising:

performing a metadata process on the temporary metadata thumbnail file.

20. The method of claim 17, further comprising:

performing an optical character recognition optimization process on the high resolution archive file.

21. The method of claim 17, further comprising:

performing an image optimization process on the high resolution archive file.

22. The method of claim 17, further comprising:

performing a quality control process on the temporary quality control thumbnail file;

performing a metadata process on the temporary metadata thumbnail file;

performing an optical character recognition optimization process on the high resolution archive file; and

performing an image optimization process on the high resolution archive file.

23. The method of claim 22, further comprising:

performing a file reassembly process.

24. The method of claim 23, wherein performance of the file reassembly process outputs a final optimized portable document format (PDF) file with metadata.