Image analysis – Image segmentation – Distinguishing text from other regions
Reexamination Certificate
2006-12-12
2010-11-23
Werner, Brian P (Department: 2624)
Image analysis
Image segmentation
Distinguishing text from other regions
C358S462000
Reexamination Certificate
active
07840071
ABSTRACT:
A method of identifying regions of different content in an image comprises dividing image data into a plurality of pixel blocks, extracting features of the pixel blocks and classifying the content of the pixel blocks based on extracted features. Extracting comprises, for each pixel block, convolving a magic square filter with the pixels of the pixel block and summing the results, and calculating the percentage of background pixels in the pixel block. The magic square filter is a 3×3 kernel that has a specific selectivity towards the statistical appearance and geometric alignment of a document based text of various fonts, sizes and styles. The complete sum of the magic square filter, as well as the sum of the rows, columns and diagonals of the magic square filter are zero.
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Tang Yichuan
Zhou Hui
Drennan Barry
Seiko Epson Corporation
Watson Mark P.
Werner Brian P
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