Determining pixels textual characteristics

Details Determining pixels textual characteristics Determining pixels textual characteristics

2004-10-12

2009-11-10

Werner, Brian P (Department: 2624)

Image analysis

Image segmentation

Distinguishing text from other regions

C358S462000

Reexamination Certificate

active

07616814

ABSTRACT:
Pixels are classified as text; or “non-text” by responding to accumulated luminous brightness gradients within a predetermined pixel interior. Text and non-text image characteristics rest on estimating text-containing rectangles by determining a narrow width and a height of a peak in an interval of accumulated gradients around each pixel. The text characteristics also are inferred by detecting character corners by quantifying and smoothing gradient angles and by associating directional corner responses with each pixel.

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