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An Image Edge Extraction Method Preserving Local Edge Direction

A technology of edge direction and image edge, which is applied in the field of computer vision and image processing, and can solve problems such as the lack of local edge direction

Active Publication Date: 2021-07-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing image edge extraction method lacks the local edge direction during the edge extraction process, and proposes an image edge extraction method that retains the local edge direction

Method used

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  • An Image Edge Extraction Method Preserving Local Edge Direction
  • An Image Edge Extraction Method Preserving Local Edge Direction

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Embodiment Construction

[0019] Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the implementations shown and described in the drawings are only exemplary, intended to explain the principle and spirit of the present invention, rather than limit the scope of the present invention.

[0020] Embodiments of the present invention provide an image edge extraction method that preserves local edge directions, such as figure 1 shown, including the following steps:

[0021] S1. Read in the three-channel RGB image to be processed, and obtain array data of H*W*3 size (H, W are the height and width of the image, respectively).

[0022] S2. Setting an edge extraction threshold threshold.

[0023] Before extracting the edge of the image, it is necessary to initialize the intensity of the extracted edge, and set the edge extraction threshold threshold to achieve the purpose of extracting a certain intensity edge...

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Abstract

The invention discloses an image edge extraction method for retaining local edge directions, comprising the following steps: S1, reading in a three-channel RGB image to be processed; S2, setting an edge extraction threshold threshold; S3, converting the three-channel RGB image to be processed Converting to a grayscale image; S4. According to the edge extraction threshold threshold, use an edge extraction operator to perform edge extraction on the grayscale image to obtain an edge map. The present invention can preserve the local direction of the picture edge on the basis of extracting the picture edge, so that the processed edge map retains more local information.

Description

technical field [0001] The invention belongs to the technical field of computer vision and image processing, and in particular relates to the design of an image edge extraction method that preserves local edge directions. Background technique [0002] The existing image edge extraction methods are mainly divided into two categories: one is the edge detection operator based on the first-order differential, which detects the image edge by calculating the local maximum value of the first-order derivative, such as: Roberts operator, Prewitt algorithm operator, Sobel operator, Canny operator, etc., and another edge detection operator based on the second-order differential, which detects the edge by seeking the zero-crossing point in the second-order derivative, such as the LOG operator. [0003] The existing image edge extraction methods all deal with single-channel or gray-scale images, and in local processing, they only calculate the size of the edge and ignore the directionali...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/13G06T7/136
CPCG06T2207/20021G06T7/13G06T7/136
Inventor 潘晔董锋邵怀宗胡全管庆王文钦陈慧
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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