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Method for omnidirectional processing of 2D images including recognizable characters

a 2d image and character technology, applied in the field of optical readers, can solve the problems of poorly equipped ocr readers for recognizing characters obliquely in captured images, and achieve the effect of improving the accuracy of ocr readers

Inactive Publication Date: 2013-10-01
HAND HELD PRODS
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In addition to being too slow for their designated applications, OCR readers have been observed to be poorly equipped to recognize characters obliquely oriented in a captured image.

Method used

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Embodiment Construction

[0022]A flow diagram of the main character recognition algorithm of the present invention for locating and recognizing recognizable characters is shown in FIG. 1a. At block 12 searching for a pixel grouping in a captured image proceeds according to a starburst pattern. According to a starburst search, a reader polls pixels at positions of generally increasing distances from a starburst center position in varying directions from a center position until a first pixel grouping is found at block 14. When a first pixel grouping is found, the reader subjects the pixel grouping to an edge length determining edge crawling process for estimating the size of the grouping based on the length of the pixel grouping's edge. The reader at block 18 then determines if the pixel grouping's edge is of sufficient length to represent a potentially recognizable character. Pixel groupings having edges of length sufficient to potentially represent a recognizable character are referred to herein as “globule...

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Abstract

The invention is a method for omnidirectional recognition of recognizable characters in a captured two-dimensional image. An optical reader configured in accordance with the invention searches for pixel groupings in a starburst pattern, and subjects located pixel groupings to a preliminary edge crawling process which records the pixel position of the grouping's edge and records the count of edge pixels. If two similar-sized pixel groupings are located that are of sizes sufficient to potentially represent recognizable characters, then the reader launches “alignment rails” at pixel positions substantially parallel to a centerline connecting the center points of the two similarly sized groupings. A reader according to the invention searches for additional recognizable characters within the rail area, and subjects each located pixel grouping within the rail area to a shape-characterizing edge crawling process for developing data that characterizes the shape of a pixel grouping's edge. After adjusting the orientation representation of the shape-characterizing data the reader compares the developed shape-characterizing data to previously stored shape-characterizing data to determine the character represented by the grouping on the basis of the best fit data.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]The present application is a continuation of U.S. patent application Ser. No. 12 / 315,858 filed Dec. 5, 2008 entitled “Method For Omnidirectional Processing of 2D Images Including Recognizable Characters” which is a continuation of U.S. patent application Ser. No. 12 / 069,438 filed Feb. 7, 2008 entitled “Method For Omnidirectional Processing Of 2D Images Including Recognizable Characters” which is a continuation of U.S. patent application Ser. No. 10 / 774,218 filed Feb. 6, 2004 entitled “Method For Omnidirectional Processing Of 2D Images Including Recognizable Characters” which is a continuation of U.S. patent application Ser. No. 09 / 724,367 filed Nov. 28, 2000 entitled “Method For Omnidirectional Processing Of 2D Images Including Recognizable Characters.” Priority of each of the above applications is claimed and each of the above applications is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]The invention relat...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G06K9/00G06K9/34
Inventor LONGACRE, JR., ANDREW
Owner HAND HELD PRODS
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