REFORMATTING BINARY IMAGE DATA TO GENERATE SMALLER COMPRESSED IMAGE DATA SIZE

• US 20050244060A1
• Filed: 04/30/2004
• Published: 11/03/2005
• Est. Priority Date: 04/30/2004
• Status: Abandoned Application

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: TSE, Francis Kapo, NAGARAJAN, Ramesh, LI, Xing
• Application Number:
  US10/709,386
• Publication Number:
  US 20050244060A1
• Time in Patent Office: Days
• US Class Current: 382/232
• CPC Class Codes: G06V 30/413 Classification of content, e.g. text, photographs or tables
• CPC Class Codes: H04N 1/41 Bandwidth or redundancy reduction by scanning H04N1/17 ; methods or arrangements for coding, decoding, compressing or decompressing digital video signals H04N19/00

Abstract

In various exemplary embodiments, systems include a segmentor to segment text binary image data to a first plane. A subtractor subtracts text binary image from binary image data to generate a non-text binary image data in a second plane. A converter converts non-text binary image data in the second plane into non-text gray scale image data in the second plane. A first compressor compresses the text gray scale image data in the first plane. A second compressor compresses the non-text gray scale mage in the second plane.

Claims

1. A method for reformatting binary image data, comprising:

converting binary image data into gray scale image data;

segmenting gray scale image data into a first plane having high spatial frequency gray scale image data and a second plane having low spatial frequency gray scale image data; and

separately compressing the high spatial frequency gray scale image data in the first plane and the low spatial frequency gray scale image data in the second plane.

2. The method of claim 1, wherein segmenting gray scale image data includes segmenting the high spatial frequency gray scale image data into a plurality of planes based on gray scale levels of the high spatial frequency gray scale image data.

3. The method of claim 1, further comprising:

enhancing the low spatial frequency gray scale image data in the second plane.

4. A computer readable medium or a modulated signal being encoded to perform the method of claim 1.

5. A method for reformatting binary image data, comprising:

segmenting binary image data to generate text binary image data in a first plane;

subtracting the text binary image data from binary image data to generate non-text binary image data in a second plane;

converting the non-text binary image data in the second plane into non-text gray scale image data in the second plane; and

separately compressing the text binary image data in the first plane and the non-text gray scale image data in the second plane.

6. The method of claim 5, further comprising:

removing speckle noise from the text binary image data in the first plane.

7. The method of claim 5, further comprising:

enhancing the non-text gray scale image data in the second plane.

8. A computer readable medium or a modulated signal being encoded to perform the method of claim 5.

9. An apparatus to reformat binary image data, comprising:

a converter to convert binary image data into gray scale image data;

a segmentor to segment gray scale image data into high spatial frequency gray scale image data in a first plane and low spatial frequency gray scale image data in a second plane;

a first compressor to compress the high spatial frequency gray scale image data in the first plane; and

a second compressor to compress the low spatial frequency gray scale image data in the second plane.

10. The apparatus of claim 9, wherein the segmentor segments the high spatial frequency gray scale image data into a plurality of planes based on gray scale levels of the high spatial frequency gray scale image data.

11. The apparatus of claim 9, further comprising:

a filter to enhance the low spatial frequency gray scale image data in the second plane.

12. A marking device incorporating the apparatus of claim 9.

13. A digital photocopier incorporating the apparatus of claim 9.

14. A stand alone document scanner or a multifunctional device incorporating the apparatus of claim 9.

15. An apparatus to reformat binary image data, comprising:

a segmentor to segment text binary image data to a first plane;

a subtractor to subtract text binary image from binary image data to generate a non-text binary image data in a second plane;

a converter to convert non-text binary image data in the second plane into non-text gray scale image data in the second plane;

a first compressor to compress the text gray scale image data in the first plane; and

a second compressor to compress the non-text gray scale mage in the second plane.

16. The apparatus of claim 15, further comprising:

a first filter to remove speckle noise from the text binary image data in the first plane.

17. The apparatus of claim 15, further comprising:

a second filter to enhance the non-text gray scale image data in the second plane.

18. A marking device incorporating the apparatus of claim 15.

19. A digital photocopier incorporating the apparatus of claim 15.

20. A stand alone document scanner or a multifunctional device incorporating the apparatus of claim 15.