System and method to enable correction of text handling mismatches via segmentation

• US 8,538,152 B2
• Filed: 09/12/2011
• Issued: 09/17/2013
• Est. Priority Date: 09/12/2011
• Status: Expired due to Fees

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Robinson, David, Loj, Katherine
• Primary Examiner(s): Kassa, Yosef
• Application Number:
  US13/230,428
• Publication Number:
  US 20130063466A1
• Time in Patent Office: 736 Days
• Field of Search: 382/112, 382/164, 382/165, 382/171, 382/177, 358/537, 358/538, 358/540, 358/453
• US Class Current: 382/173
• CPC Class Codes: H04N 1/4092 Edge or detail enhancement

Abstract

Disclosed is a processor-implemented method for processing image data using an image processing apparatus. The processor is configured to receive a PDL file of image data and raster image process (RIP) the PDL file to determine at least pixels representing text of a predetermined colorant. The ripped file is then segmented to determine at least any text pixels of the predetermined colorant not initially indicated by the ripped file. The results are combined to determine text pixels of the predetermined colorant for marking onto a substrate using marking material (e.g., ink). In some instances, pixels of the predetermined colorant can be tagged during segmenting using a tag plane to determine text pixels for marking by the output device.

Claims

1. A processor-implemented method for processing image data in an image processing apparatus, the image processing apparatus comprising at least one processor for processing documents containing image data comprising a plurality of pixels, the method comprising the following acts implemented by the at least one processor:

receiving a page description language file of image data comprising a plurality of pixels and related image instructions;

raster image processing the page description language file to create a bitmap file with a first data structure indicating at least pixels representing text of a predetermined colorant;

segmenting the bitmap file to determine at least pixels in the bitmap file representing text of the predetermined colorant not indicated in the first data structure to form a second data structure, and

combining the first data structure and the second data structure to form a third data structure indicating text pixels of the predetermined colorant for marking onto a substrate using an image output device.

2. The method according to claim 1, wherein the first data structure is a binary tag plane indicating pixels representing text of the predetermined colorant as “

ON”

.

3. The method according to claim 1, wherein the second data structure is a binary tag plane indicating pixels representing text of the predetermined colorant as “

ON”

.

4. The method according to claim 1, wherein the third data structure is a comprehensive binary tag plane indicating a combination of the pixels representing text of the predetermined colorant from the first data structure and the second data structure, and, wherein the combining comprises, for each pixel of the image data, if at least one of the first data structure or the second data structure indicates that a pixel represents text of the predetermined colorant, then indicating in the third data structure that the pixel is a text pixel of the predetermined colorant.

5. The method according to claim 1, wherein the predetermined colorant is pure black, and wherein segmenting determines black pixels in the bitmap file representing pixels to be marked with pure black marking material, and wherein the combining determines black pixels in the third data structure.

6. The method according to claim 1, wherein the segmenting comprises, for each pixel:

determining if a pixel in the bitmap file is a text pixel;

determining if the text pixel is a black text pixel;

determining if the pixel location also includes one or more additional color planes for output, and wherein

if the pixel is a determined black text pixel and without output in one or more additional color planes, then, indicating that pixel location as “

ON”

in the second data structure to represent a pure black text pixel,

else indicating that pixel location as “

OFF”

in the second data structure.

7. The method according to claim 1, wherein the image processing apparatus further comprises an image output device configured to output image data, and wherein the method further comprises sending the bitmap file and the third data structure to the image output device.

8. The method according to claim 7, wherein the output device comprises marking devices for marking pixels with marking materials, and wherein the method further comprises marking pixels with marking materials onto the substrate using the marking devices based on the third data structure and the related image instructions.

9. The method according to claim 1, wherein the predetermined colorant is selected from the group consisting of:

pure cyan (C), pure magenta (M), pure yellow (Y), pure black (K).

10. The method according to claim 1, wherein the predetermined colorant is selected based on a text pixel comprising at least a predetermined percentage of an amount of a particular colorant.

11. A system for processing image data having a plurality of pixels comprising at least one processing element, the at least one processing element comprising an input and an output and configured to receive and process pixels of the image data, the at least one processing element configured to:

receive a page description language file of image data comprising a plurality of pixels and related image instructions;

raster image process the page description language file to create a bitmap file with a first data structure indicating at least pixels representing text of a predetermined colorant;

segment the bitmap file to determine at least pixels in the bitmap file representing text of the predetermined colorant not indicated in the first data structure to form a second data structure, and

combine the first data structure and the second data structure to form a third data structure indicating text pixels of the predetermined colorant for marking onto a substrate using an image output device.

12. The system according to claim 11, wherein the first data structure is a binary tag plane indicating pixels representing text of the predetermined colorant as “

ON”

.

13. The system according to claim 11, wherein the second data structure is a binary tag plane indicating pixels representing text of the predetermined colorant as “

ON”

.

14. The system according to claim 11, wherein the third data structure is a comprehensive binary tag plane indicating a combination of the pixels representing text of the predetermined colorant from the first data structure and the second data structure, and, wherein the combining by the at least one processing element comprises, for each pixel of the image data, if at least one of the first data structure or the second data structure indicates that a pixel represents text of the predetermined colorant, then indicating in the third data structure that the pixel is a text pixel of the predetermined colorant.

15. The system according to claim 11, wherein the predetermined colorant is pure black, and wherein segmenting by the at least one processing element determines black pixels in the bitmap file representing pixels to be marked only with black marking material.

16. The system according to claim 11, wherein the segmenting by the at least one processing element comprises, for each pixel:

determining if a pixel in the bitmap file is a text pixel;

determining if the text pixel is a black text pixel;

determining if the pixel also includes one or more additional color planes for output, and wherein

if, for that pixel location, the pixel is a determined black text pixel and without output in one or more additional color planes, then, indicating that pixel location as “

ON”

in the second data structure to represent a pure black text pixel,

else indicating that pixel location as “

OFF”

in the second data structure.

17. The system according to claim 11, wherein the system further comprises an image output device configured to output image data, and wherein the at least one processing element is configured to send the bitmap file and the third data structure to the image output device.

18. The system according to claim 17, wherein the output device comprises marking devices for marking pixels with marking materials, and wherein marking devices are configured to mark pixels with marking materials onto the substrate using the marking devices based on the third data structure and the related image instructions.

19. The system according to claim 18, wherein the predetermined colorant is selected from the group consisting of:

pure cyan (C), pure magenta (M), pure yellow (Y), pure black (K).

20. The system according to claim 11, wherein the predetermined colorant is selected based on a text pixel comprising at least a predetermined percentage of an amount of a particular colorant.

21. A non-transitory computer readable medium having stored computer executable instructions, wherein the computer executable instructions, when executed by a computer, direct a computer to perform a method for processing image data, the method comprising:

receiving a page description language file of image data comprising a plurality of pixels and related image instructions;

raster image processing the page description language file to create a bitmap file with a first data structure indicating at least pixels representing text of a predetermined colorant;

segmenting the bitmap file to determine at least pixels in the bitmap file representing text of the predetermined colorant not indicated in the first data structure to form a second data structure, and

combining the first data structure and the second data structure to form a third data structure indicating text pixels of the predetermined colorant for marking onto a substrate using an image output device.

22. The medium according to claim 21, wherein the first data structure is a binary tag plane indicating pixels representing text of the predetermined colorant as “

ON”

.

23. The medium according to claim 21, wherein the second data structure is a binary tag plane indicating pixels representing text of the predetermined colorant as “

ON”

.

24. The medium according to claim 21, wherein the third data structure is a comprehensive binary tag plane indicating a combination of the pixels representing text of the predetermined colorant from the first data structure and the second data structure, and, wherein the combining comprises, for each pixel of the image data, if at least one of the first data structure or the second data structure indicates that a pixel represents text of the predetermined colorant, then indicating in the third data structure that the pixel is a text pixel of the predetermined colorant.

25. The medium according to claim 21, wherein the predetermined colorant is pure black, and wherein the segmenting determines black pixels in the bitmap file representing pixels to be marked only with black marking material.

26. The medium according to claim 21, wherein the segmenting comprises, for each pixel:

determining if a pixel in the bitmap file is a text pixel;

determining if the text pixel is a black text pixel;

determining if the pixel also includes one or more additional color planes for output, and wherein

if, for that pixel location, the pixel is a determined black text pixel and without output in one or more additional color planes, then, indicating that pixel location as “

ON”

in the second data structure to represent a pure black text pixel,

else indicating that pixel location as “

OFF”

in the second data structure.

27. The medium according to claim 21, wherein the image processing apparatus further comprises an image output device configured to output image data, and wherein the method further comprises sending the bitmap file and the third data structure to the image output device.

28. The medium according to claim 27, wherein the output device comprises marking devices for marking pixels with marking materials, and wherein the method further comprises marking pixels with marking materials onto the substrate using the marking devices based on the third data structure and the related image instructions.

29. The medium according to claim 28, wherein the predetermined colorant is selected from the group consisting of:

pure cyan (C), pure magenta (M), pure yellow (Y), pure black (K).

30. The medium according to claim 21, wherein the predetermined colorant is selected based on a text pixel comprising at least a predetermined percentage of an amount of a particular colorant.