Method and device for measuring image inclination angle of business card

A technology of tilt angle and measurement method, which is applied in the direction of character and pattern recognition, instruments, computer parts, etc., can solve the problems of not very high angle accuracy, inaccurate calculation results, loss of function, etc., and achieve the effect of accelerating the calculation process

A technology of tilt angle and measurement method, which is applied in the direction of character and pattern recognition, instruments, computer parts, etc., can solve the problems of not very high angle accuracy, inaccurate calculation results, loss of function, etc., and achieve the effect of accelerating the calculation process

CN101770575AActive Publication Date: 2010-07-07HANVON CORP
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  • Method and device for measuring image inclination angle of business card
  • Method and device for measuring image inclination angle of business card
  • Method and device for measuring image inclination angle of business card

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Embodiment Construction

[0045] In order to understand the technical content of the present invention more clearly, the following process is given in detail.

[0046] The technical solution proposed by the present invention is suitable for grayscale images scanned or photographed by business cards. Since the background noise will affect the detection of the border line, the background of the picture scanned or photographed in the present invention is relatively clean and has no obvious texture. If the image is colored , can be converted into a grayscale image first, and then processed by the technical solution of the present invention.

[0047] In order to illustrate the definition of the tilt angle, the text line (or text column) in the business card image is abstracted into a straight line. When the line is horizontal or vertical, the tilt angle of the business card image is 0 (that is, no tilt). When the rotation occurs from the position where the tilt angle is 0, the rotation angle is the tilt ang...

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Abstract

The invention relates to a method and a device for measuring image inclination angle of a business card, which belong to the technical field of OCR. The method extracts the edge image of a business card image at first, searches the peripheral frame line of a business card in the edge image, judges if the image is inclined according to the inclination degree of the peripheral frame line, judges word editing direction thereof for the inclined picture, projects along the word editing direction and calculates the inclination angle of the image by projection characteristic. Judging the inclination of the image by collecting the peripheral frame line of the image, the invention can divide the images into an inclination type and an aclinal type quickly and process the two types respectively. The invention quickly judges the word editing direction by comparing the characteristics of projection histograms in the horizontal direction and the vertical direction. The determination of the word editing direction is greatly useful for calculating the inclination angle by projecting and analyzing the layout of the business card image.

Description

technical field [0001] The invention belongs to the technical fields of digital image processing and OCR (optical character recognition), and in particular relates to a method and a device for measuring the inclination angle of a business card image. Background technique [0002] In today's business activities, business cards are already an important information carrier for business partners, customers, etc. Faced with a large number of business cards, companies and individuals need a way to automatically and accurately collect and process information. Currently, OCR ( Optical Character Recognition) system to complete this function. In the business card OCR system, the input business card image may have a certain angle of inclination (generally less than 5°), which will have a negative impact on the layout analysis, character segmentation and character recognition of the business card. Angle for image correction. [0003] The existing tilt detection methods for document im...

Claims

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Application Information

Patent Timeline
07 Jul 2010
Publication
CN101770575A
IPC
G06K9/32
Inventors
李永彬; 朱军民