A character recognition method based on convolutional neural network

A convolutional neural network, character recognition technology, applied in the field of pattern recognition, can solve problems such as the inability to achieve high accuracy

Active Publication Date: 2020-05-26
WUHAN UNIV
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AI Technical Summary

Problems solved by technology

However, for poor-quality and complex drawings, traditional recognition algorithms based on convolutional neural networks cannot achieve high accuracy.

Method used

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  • A character recognition method based on convolutional neural network
  • A character recognition method based on convolutional neural network
  • A character recognition method based on convolutional neural network

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Embodiment Construction

[0063] The technical solutions and effects of the present invention will be further described in detail below with reference to the accompanying drawings.

[0064] refer to figure 1 , the implementation steps of a character recognition method based on a convolutional neural network provided by an embodiment of the present invention are as follows:

[0065] Step 1: Use the optimal threshold processing based on the Ostu method to binarize the scanned documents of engineering drawings, and separate the graphics and text in the scanned documents of engineering drawings from the background;

[0066] Specific steps are as follows:

[0067] Use {0, 1, 2, ..., L-1} to represent L different gray levels in a scanned image, calculate the normalized histogram of the input image, and use p i , i=0,1,2,...,L-1 represents the histogram, assuming a threshold k is selected, the image is divided into C at k 0 ={0,1,...,k} and C 1 ={k+1,k+2,...,L-1} two groups, then the pixels are divided in...

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Abstract

The invention discloses a character recognition method based on convolutional neural network, which mainly solves the problems of time-consuming and labor-intensive and high error rate in the existing manual input of engineering drawing data. The main steps include: 1) adopting the best method based on Otsu method Global thresholding converts a grayscale image into a binary image. 2) Carry out rotation correction on the skewed image. 3) The table frame is extracted by using the algorithm of mathematical morphology. 4) Obtain the area where the character is located. 5) Rotate the oblique character string to the horizontal direction by the corresponding angle. 6) The circular Hough transform algorithm is used to find the circles in the image and extract the weld bead numbers in the engineering drawings. 7) Use the method of convolutional neural network to recognize the graphic and text of engineering drawings. 8) Correct simple errors through coding rules, and automatically correct recognition errors. 9) Output and store drawing data. The invention has high accuracy and real-time performance in graphic and text recognition of engineering drawings, and realizes efficient recording and management of engineering drawing data.

Description

technical field [0001] The invention belongs to the field of pattern recognition, in particular to a character recognition method based on a convolutional neural network, which can be used for document scanning and recognition of industrial drawings. Background technique [0002] Optical Character Recognition (OCR) technology refers to the process in which electronic devices check characters printed on paper, determine their shapes by detecting dark and bright patterns, and then use character recognition to translate the shapes into computer text. OCR is an important research direction in the field of pattern recognition, and is widely used in automatic information processing, and has important practical significance in engineering fields such as architecture and machinery. [0003] In actual engineering, the staff need to enter the information of industrial drawings into the computer for the recording and management of engineering information. However, under normal circums...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G06K9/34
CPCG06V30/422G06V30/158G06V30/10
Inventor 张海剑成帅杨天韵
Owner WUHAN UNIV
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