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Invoice image recognition method and system based on image processing

An image recognition and image processing technology, applied in the field of image processing, can solve the problems of optical character recognition errors and low recognition accuracy, and achieve the effect of reducing repeated operations and judgments, and reducing the impact

Active Publication Date: 2022-07-01
深圳航天信息有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The problem in the prior art is that the use of optical character recognition has certain requirements for the image quality of the invoice itself
When there are wrinkles, offsets, or false prints on the surface of the invoice, it will cause problems such as optical character recognition errors and low recognition accuracy

Method used

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  • Invoice image recognition method and system based on image processing
  • Invoice image recognition method and system based on image processing
  • Invoice image recognition method and system based on image processing

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Embodiment 1

[0030] The main application scenarios of the present invention are: the scene of invoice image recognition, the surface image of the invoice is collected by the camera, the camera adopts a top view, the invoice should be kept in a fixed position, and the image is collected one by one. During the image collection process, there is no reflection caused by the light source, etc. optical effects.

[0031] see figure 1 , which shows a method flowchart of an image processing-based invoice image recognition method provided by an embodiment of the present invention, and the method includes the following steps:

[0032] Step 1: Differentiate the machine-printed invoice image and the standard invoice template image to obtain a difference image containing only the machine-printed content; obtain the edge pixels in the difference image, and construct a gradient histogram according to the gradient direction of the edge pixels; The gradient histogram selects an edge pixel in a preset gradi...

Embodiment 2

[0059] This embodiment provides an embodiment of an invoice image recognition system based on image processing, including a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program when executed by the processor realizes a The steps of a scrap steel crushing yard storage method. Since the embodiment 1 has already described an invoice recognition method based on image processing in detail, it will not be described too much here.

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Abstract

The invention relates to the technical field of image processing, in particular to an invoice image recognition method and system based on image processing. The method comprises the following steps: obtaining a difference image only containing machine-printed content; according to a gradient histogram of edge pixel points in the difference image; selecting an edge pixel point in a preset gradient direction as an angular point, and screening to obtain a first angular point; obtaining a character region, wherein the character region is a minimum enclosing rectangle of a complete machine-typed character string; screening the first corner points around each character in all the character areas by using the structure parameters between the first corner points to obtain the structure corner points of all the characters in the character areas; and segmenting and identifying the characters according to the coordinates of the structure angular points belonging to each character in the character region. Redundant angular points reserved by SIFT angular point detection can be greatly reduced, and repeated operation and judgment of all pixel points are reduced; the influence of redundant angular points on character segmentation is further reduced, and accurate character segmentation information is obtained.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to an invoice image recognition method and system based on image processing. Background technique [0002] With the development of science and technology, commercial invoices are mainly used to print invoices at this stage. The traditional invoice statistics work is to manually proofread and review invoices one by one, which is not only inefficient, but also affected by human factors. In the prior art, the computer recognizes the invoice number and the invoice code, and obtains the character recognition information of the target area through optical character recognition, which greatly reduces the tasks of invoice statistics and review. [0003] The problem in the prior art is that the use of optical character recognition has certain requirements on the image quality of the invoice itself. When there are wrinkles, offsets, and virtual printing on the surface of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06V30/42G06V10/50G06V10/44G06V30/148G06V30/16G06T7/11
CPCG06T7/11
Inventor 仇庆宇李淼巨东敏
Owner 深圳航天信息有限公司
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