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Preprocessing equipment and method for distinguishing image character

An image and character technology, applied in the field of character preprocessing equipment, can solve the problem of deteriorating binary performance

Inactive Publication Date: 2004-10-13
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, binary performance is undesirably degraded when performed on the entire image captured in irregular lighting situations with shadows cast upon it

Method used

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  • Preprocessing equipment and method for distinguishing image character
  • Preprocessing equipment and method for distinguishing image character
  • Preprocessing equipment and method for distinguishing image character

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Experimental program
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Embodiment Construction

[0086] In the following description, specific details such as the size of images and the size of character and background blocks are provided for example only. The present invention can be readily practiced by one skilled in the art without or with modification of these specific details.

[0087] In the embodiment of the present invention, it is assumed that an input image has a size of 640*480 pixels. The term "block" used herein refers to character and background blocks, and it is assumed here that each block has a size of 8x8 pixels. In addition, the term "grouped block" refers to a block generated by combining a binarized central block with its 8 neighboring blocks, and it is assumed here that the grouped block has a size of 24×24 pixels.

[0088] In addition, the term "band" refers to a plurality of characters closely arranged at regular intervals. In an embodiment of the invention, skewed objects in the image are corrected by calculating the orientation angle formed by...

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PUM

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Abstract

Disclosed is a device for recognizing characters in an image. An input part receives the image. A blurring decision part classifies the received image into character blocks and background blocks, calculates an average energy ratio of the character blocks, and compares the average energy ratio with a predetermined threshold to decide whether or not the received image is blurred. If the received image is not blurred, an image binarization part classifies the received image into character blocks and background blocks, compares pixels in the character blocks with a pixel threshold, binarizes the pixels in the character blocks into a brightness value for a character pixel and a brightness value for a background pixel according to the comparison result, and binarizes pixels in the background blocks into the brightness value for a background pixel. A character recognition part recognizes characters in the binarized image.

Description

technical field [0001] The present invention relates generally to apparatus and methods for processing images, and in particular, to preprocessing apparatus and methods for recognizing characters contained in images. Background technique [0002] Usually, for recognizing pictorial characters, preprocessing operations are performed. "Preprocessing operation" refers to an operation for processing an image prior to recognizing characters in the image. Image preprocessing operations can include determining whether an input image is suitable for character recognition, correcting objects for skew in the input image, correcting the size of the input image appropriately, and binarizing the input image so that characters in the input image can be recognized . [0003] First, the images received for preprocessing can be images taken with a camera. When the subject is out of focus or irregularly illuminated during shooting, the captured image will become blurred. Recognition of cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T7/40G06V30/10G06V30/162G06V30/164
CPCG06K2209/01G06K9/325G06K9/38G06K9/40G06V20/62G06V30/10G06V30/162G06V30/164G06T7/00
Inventor 林采焕金焕徐正旭金南哲金钟俒朴埈孝辛基泽张益熏
Owner SAMSUNG ELECTRONICS CO LTD