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Object-based optical character recognition pre-processing algorithm

A preprocessing and object technology, applied in character recognition, character and pattern recognition, computing, etc., can solve expensive, unsatisfactory, and cumbersome problems

Active Publication Date: 2015-03-25
OMNIVISION TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] It should be recognized that additional equipment such as that shown in Figure 1 may be perceived by consumers as bulky, expensive and undesirable

Method used

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  • Object-based optical character recognition pre-processing algorithm
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  • Object-based optical character recognition pre-processing algorithm

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Embodiment Construction

[0016] While commercially available dedicated business card OCR equipment, hardware and software exist, they typically utilize dedicated hardware in the form of dedicated scanners and / or "close focus" dedicated cameras. As used herein, the term "near focus" means that the camera is adjusted so that objects relatively close to the camera are in optimal focus. For a webcam or laptop camera, this means that the camera will be adjusted to focus on an object approximately 15cm to 25cm away from the camera, unlike what such a camera would normally focus on (for example, to capture a desktop or laptop user images, such as for video conferencing) a typical distance of 65cm. Some of these cameras include a business card holder to ensure that the business card is held steadily at an optimal distance from the camera for OCR input image capture. But close-focus cameras (when available) only serve as inferior replacements for traditional web cameras. For example, their characteristic clo...

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Abstract

A method of pre-processing a defocused image of an object includes applying an object-based sharpening filter on the defocused image to produce a sharper image; and quantizing the sharper image using block-wise quantization. A system for generating decoded text data from alphanumeric information printed upon an object includes a camera that obtains image data of the alphanumeric information. The system also includes a pre-processor that (a) performs block-wise quantization of the image data to form conditioned image data, and (b) performs optical character recognition on the conditioned image data to generate the decoded text data.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application No. 61 / 157,904, filed March 6, 2009, the entire contents of which are incorporated herein by reference. Background technique [0003] While software and specialized equipment for Optical Character Recognition ("OCR") are commercially available, specialized hardware is still required. For example, FIG. 1 shows an OCR system 100 that includes a dedicated business card image capture camera 110 (represented by block 110). Camera 110 is configured to capture an image of an object of interest (eg, a business card) and generate image data 115 (indicated by an arrow). In existing systems, the camera 110 is usually attached to a device external to a standard computer and is dedicated to capturing the desired image (eg, a business card image). To optimize image capture conditions, such as conjugate distance and lighting, camera 110 often includes hardware for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/38G06V30/162G06V30/10
CPCG06K2209/01G06K9/38G06V30/10G06V30/162
Inventor 阿米特·阿什克约瑟夫·C·达格尔
Owner OMNIVISION TECH INC