Patent ID: 7616814
Filing Date: 2009-11-10
Classification: G06K,H04N

Abstract:
1. A method performed in a computer arrangement for determining text characteristics of pixels to discriminate between text pixels and non-text pixels of an image, comprising steps performed in said computer arrangement of: using a computer to carry out the steps of: accumulating luminous brightness gradients in a first direction for each image pixel into accumulated gradients, for each current pixel, determining a pair of edges as a function of the accumulated gradients for a predetermined pixel interval extending in a second direction perpendicular to the first direction and centered on the current pixel, thereby seeking to attain a peak height between and including a maximum value of the accumulated gradients and an average of the accumulated gradients at said edges and to attain a narrow width between said edges for different values of said edges respectively included in a pair of the predetermined pixel intervals; and discriminating between text pixels and non-text pixels as a function of the peak heights and narrow widths for the determined pairs of edges of the pixels of said image.