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Automatic positioning and recognition method for LED characters

A technology of automatic positioning and identification method, applied in the field of image processing, can solve the problems that the image binarization effect is difficult to guarantee, affect the positioning and identification of single characters, and the adhesion of digital tube characters, etc., to achieve efficient power station intelligent inspection, high accuracy rate, the effect of accurate character recognition

Active Publication Date: 2017-05-10
YIJIAHE TECH CO LTD
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Problems solved by technology

The main problem of this method is that the effect of image binarization is difficult to be guaranteed. Affected by factors such as ambient light and occlusion in the station, the characters of the digital tube after binarization may be stuck or missing, which directly affects a single character. positioning and identification

Method used

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  • Automatic positioning and recognition method for LED characters
  • Automatic positioning and recognition method for LED characters
  • Automatic positioning and recognition method for LED characters

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Embodiment Construction

[0020] Such as figure 1 As shown, the LED character automatic positioning recognition method provided by the present invention, the main steps include:

[0021] 1. Image preprocessing:

[0022] In order to suppress noise interference, the input LED digital character image is firstly denoised by median filtering with a neighborhood size of 5×5. Since the HSV space is more in line with the color perception of the human eye, the image is converted from the RGB space to the HSV space, and the V channel is extracted for subsequent processing and recognition. figure 2 The effect diagram after preprocessing is given.

[0023] 2. Single pixel edge extraction:

[0024] In order to realize character localization and recognition based on edge layout analysis, single-pixel edges need to be extracted first. Such as image 3 As shown, first use the 3×3 Sobel operator to calculate the edge direction and amplitude of each pixel, and then perform non-maximum suppression, that is, each pi...

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Abstract

The invention provides an automatic positioning and recognition method for LED characters. The automatic positioning and recognition method for LED characters comprises the following steps: obtaining a LED character image, extracting the single pixel edges from the LED character image, and performing truncation processing on the single pixel edges; performing pairing on the truncated single pixel edges to obtain paired single pixel edges, wherein the paired single pixel edges corresponding to one segment of the seven segment digital tube which is used for displaying the LED characters; combinating the paired single pixel edges according to the nearest pixel distance between each pair of single pixel edges, and realizing the positioning of the character area; obtaining the brightness of each segment of the digital tube according to the paired single pixel edges of each character and the brightness between each pair of single pixel edges, and then recognizing the representing characters. According to the invention, the edge screening and the character positioning are realized by extracting the edge and analyzing the relative layout relation among the edges, therefore, the accurate character recognition can be realized.

Description

technical field [0001] The invention belongs to the technical field of image processing and relates to a method for automatic positioning and recognition of LED characters. Background technique [0002] LED digital tube arranges a number of light-emitting diodes according to certain rules and packages them together to realize the character display function. It has the advantages of clear display, fast response, low power consumption, and long life. It is widely used in power grid substations and distribution stations. In order to ensure the normal operation of the equipment in the power station and improve the efficiency and level of station operation and maintenance, it is necessary to rely on the intelligent inspection robot to collect images of the LED digital tube equipment in the station, and automatically identify the readings of the equipment to realize the intelligence of the operation status of the equipment in the station. Identification and real-time monitoring fu...

Claims

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Application Information

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IPC IPC(8): G06K9/32
CPCG06V20/62
Inventor 项导程敏王锋赵伟许春山
Owner YIJIAHE TECH CO LTD
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