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Simple steel seal digital automatic identification method with high accuracy rate

A technology of automatic recognition and accuracy, applied in the field of recognition, can solve problems such as inability to effectively extract character outlines, inability to realize industrial automatic detection, and poor versatility

Active Publication Date: 2012-04-25
INST OF APPLIED MATHEMATICS HEBEI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of combining Canny operator and edge closure uses the same fixed threshold, which cannot effectively extract all character outlines in complex backgrounds. This method is not universal and cannot realize industrial automatic detection.

Method used

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  • Simple steel seal digital automatic identification method with high accuracy rate
  • Simple steel seal digital automatic identification method with high accuracy rate
  • Simple steel seal digital automatic identification method with high accuracy rate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0081] The specific identification steps of the present invention are as follows:

[0082] 1. Coarse positioning of the character area

[0083] In the present invention, the positions of the steel cylinder of the workpiece and the camera are relatively fixed, so we first roughly locate the character area. This reduces the influence of the stamped digital background on character extraction. figure 2 It is the collected digital image of steel cylinder stamping, the size is 320×240. () image 3 is the image intercepted after rough positioning of the character area, and the range of the intercepted rectangle in the present invention is [(30,150), (289,209)]. The area size is 260x60.

[0084] 2. Edge extraction

[0085] The edge is the place where the image signal changes suddenly, and it is one of the important features of the image. Since the Canny operator was proposed, it has shown good performance in various edge detections, and has become a standard for evaluating othe...

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PUM

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Abstract

The invention provides a simple steel seal digital automatic identification method with high accuracy rate. The method comprises the following steps of: first, roughly positioning character region; dividing the character region; and then converting a digital image from a RGB (Red-Green-Blue) space to a YCbCr space; extracting character contour from a Y component of the digital image by using a method combined with Canny operator of block self-adaptive threshold and edge closure; and identifying numbers by using a cascade template matching grouping method. The simple steel seal digital automatic identification method with high accuracy rate, provided by the invention, has the advantages of good detection result edge connection degree, low noise sensitivity, strong real-time property and the like; the steel seal numbers can be accurately identified under the condition of strong interference in real time; and requirements of industrial automatic detection and informatization are satisfied.

Description

technical field [0001] The invention relates to a method capable of automatically identifying stamped numbers on a liquefied gas cylinder at an industrial site, which belongs to the technical field of identification. Background technique [0002] The identification code of the liquefied gas cylinder is a concave character embossed on the shield, which has its inherent characteristics compared with the characters generally formed by using the color difference between the foreground and the background: Embossed characters are concave and have a certain depth, while most other characters are two-dimensional characters; Embossed characters are the same color as the background, and the display quality of character images is poor; When embossing characters, due to on-site factors such as loose fonts, tilting or steel cylinder materials, the embossed characters are deformed such as tilting, defects, etc., and the depths are different, and there is strong interference around the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/20G06K9/46
Inventor 陈宏彩程煜郝存明
Owner INST OF APPLIED MATHEMATICS HEBEI ACADEMY OF SCI
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