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Method and device for distorted image correction based on corner detection

An image correction and corner detection technology, applied in the field of image processing, can solve problems such as image distortion, and achieve the effect of improving the accuracy and reducing the input of manpower and material resources.

Active Publication Date: 2022-04-05
SICHUAN CHANGHONG ELECTRIC CO LTD
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is: to overcome the image distortion problem caused by non-flat shooting of rectangular images, and to propose a method and device for correcting distorted images based on corner detection

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  • Method and device for distorted image correction based on corner detection
  • Method and device for distorted image correction based on corner detection
  • Method and device for distorted image correction based on corner detection

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[0039] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0040] like figure 1 As shown, the distorted image correction method based on corner detection includes the following steps:

[0041] S1, extracting the edge of the target area of ​​the image to be corrected to obtain an edge image;

[0042] The image to be corrected is an image obtained by taking a non-flat shot of a rectangular item, and the target area refers to the area where the corresponding item is located in the image to be corrected, which is generally a quadrilateral.

[0043] Step S1 may include the following steps:

[0044] S101, performing grayscale transformation on the image to be corrected to obtain a grayscale image;

[0045] The above-mentioned grayscale transformation algorithm is an existing algorithm, and details are not described here. ...

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Abstract

The present invention relates to the technical field of image processing. Aiming at the problem of image distortion caused by non-flat images of rectangular images, a distorted image correction method based on corner point detection is proposed, which includes the following steps: extracting the edge of the target area of ​​the image to be corrected to obtain an edge image ; Extract the candidate corner points from the edge image to obtain the candidate corner point set; filter the candidate corner points in the candidate corner point set to obtain four target corner points; transform the image to be corrected according to the target corner points to obtain the corrected image, so as to solve the problem of non-flat shooting The image distortion problem caused by the image can further improve the accuracy of subsequent OCR recognition, and reduce the input of manpower and material resources for downstream OCR applications. The present invention is suitable for correction of image distortion where the target area is a rectangular area.

Description

technical field [0001] The present invention relates to the technical field of image processing, and in particular, to a distorted image correction method and device. Background technique [0002] In recent years, artificial intelligence technology has developed by leaps and bounds, and its application fields have become wider and wider, such as robotics, speech recognition, image recognition, computer vision and autonomous driving. In terms of image recognition, OCR (Optical Character Recognition, Optical Character Recognition) recognition based on deep learning is widely used in the industry due to its high recognition accuracy and fast recognition speed. As we all know, OCR technology is generally divided into two technical branches: text detection and text recognition. Although end-to-end OCR recognition based on neural network has been launched recently, its effect in specific scenarios is not ideal. Therefore, the mainstream OCR recognition technology It is still divi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T7/13G06T7/62
CPCG06V10/245G06V30/153
Inventor 池明辉
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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