Patent ID: 7729546
Filing Date: 2010-06-01
Classification: G06K,H04N

Abstract:
1. A method for compressing an array of pixels representing image data, wherein each pixel in said array has an associated intensity value, comprising: identifying an N-by-N window centered upon a selected pixel of said array of pixels; evaluating at least one pixel in said N-by-N window to determine whether said selected pixel is a potential text element, wherein said evaluating comprises: after said identifying of said N-by-N window, if said evaluating determines that said selected pixel is a potential text element, then identifying an M-by-M window centered upon said selected pixel such that said M-by-M window is smaller than said N-by-N window; determining whether said potential text element includes text by comparing at least two pixels within said M-by-M window; assigning said selected pixel to a first layer of said plurality of layers if said determining determines that said potential text element includes text; assigning said selected pixel to a second layer of said plurality of layers if said determining determines that said potential text element does not include text; and compressing said first layer using a first compression technique to create a first compressed layer.