Method And Apparatus For Recognizing Characters In A Document Image
First Claim
Patent Images
1. A method of recognizing characters in a document image, comprising:
- examining the intentisity of pixels in said document image;
identifying a peak intensity deemed to represent foreground in said document image;
determining a threshold level for distinguishing foreground from background as a function of said identified peak intensity;
thresholding said document image using said threshold level to identify said foreground; and
performing character recognition on said identified foreground.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of recognizing characters in a document image comprises examining the intensity of pixels in the document image and identifying a peak intensity deemed to represent foreground in the document image. A threshold level for distinguishing the foreground from background in the document image as a function of the identified peak intensity is determined. The document image is thresholded using the threshold level to identify the foreground. Character recognition is performed on the foreground of the document image.
122 Citations
32 Claims
-
1. A method of recognizing characters in a document image, comprising:
-
examining the intentisity of pixels in said document image; identifying a peak intensity deemed to represent foreground in said document image; determining a threshold level for distinguishing foreground from background as a function of said identified peak intensity; thresholding said document image using said threshold level to identify said foreground; and performing character recognition on said identified foreground. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. An apparatus for recognizing characters in a document image, comprising:
-
an image analyzer examining the intensity of pixels in said document image and identifying a peak intensity deemed to represent foreground; a thresholder determining a threshold level for distinguishing foreground from background in said document image as a function of said identified peak intensity, and thresholding said document image using said threshold level to identify said foreground; and a character classifier performing character recognition on said foreground of said document image. - View Dependent Claims (20, 21)
-
-
22. A computer-readable medium embodying a computer program for recognizing characters in a document image, said computer program comprising:
-
computer program code for examing the intensity of pixels in said document image; computer program code for identifying a peak intensity deemed to represent foreground in said document image; computer program code for determining a threshold level for distinguishing foreground from background in said document image as a function of said identified peak intensity; computer program code for thresholding said document image using said threshold level to identify said foreground; and computer program code for performing character recognition on said foreground of said document image.
-
-
23. A method of recognizing a candidate character in a document image, comprising:
-
determining edge orientations and edge magnitudes of pixels in regions encompassing pixels of said candidate character; and analyzing said edge orientations and said edge magnitudes using a classification tool thereby to recognize said candidate character. - View Dependent Claims (24, 25, 26, 27)
-
-
28. An apparatus for recognizing a candidate character in a document image, comprising:
-
an image analyzer determining edge orientations and edge magnitudes of pixels in regions encompassing pixels of said candidate character; and a classification tool analyzing said edge orientations and said edge magnitudes in said document image thereby to recognize characters in said document image. - View Dependent Claims (29, 30, 31)
-
-
32. A computer-readable medium including a computer program for recognizing a candidate character in a document image, said computer program comprising:
-
computer program code for determining edge orientations of pixels in windows surrounding pixels of said candidate character; computer program code for determining edge magnitudes of pixels in windows surrounding pixels of said candidate character; and computer program code for analyzing said edge orientations and said edge magnitudes using a classification tool thereby to recognize said candidate character.
-
Specification