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Active contour method based on shape constraint and direction field, and system thereof

An active contour and direction field technology, applied in the field of image processing, can solve the problems of insufficient utilization and loss of boundary details, and achieve the effect of accurate contour and rich contour details.

Inactive Publication Date: 2010-09-15
TSINGHUA UNIV
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  • Description
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AI Technical Summary

Problems solved by technology

However, this method does not make full use of the actual information of the image—especially the boundary information of each pixel in the meaningful image—and it is easy to cause the loss of boundary details.

Method used

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  • Active contour method based on shape constraint and direction field, and system thereof
  • Active contour method based on shape constraint and direction field, and system thereof
  • Active contour method based on shape constraint and direction field, and system thereof

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Embodiment Construction

[0027] The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] figure 1 It is a flow chart of the method of the embodiment of the present invention. Such as figure 1 As shown, first input an initial contour of the target image, which can correctly indicate the geometric shape of the target image, and can mark the location of the target image and the approximate area it occupies. Each point on the initial contour is stored clockwise, and each point is marked as {X i}, at the same time, calculate the tangent direction at each point of the initial contour, denoted as {dX i}.

[0029] Three kinds of energy diagrams need to be established below (such as figure 2 shown):

[0030] First, according to the position of each point on...

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Abstract

The invention discloses an active contour method based on shape constraint and direction field, and a system thereof. The method comprises the following steps of: S1, inputting the initial contour of a target object in image, and establishing the energy field relating to the shape distance of the initial contour according to the shape priori knowledge of the initial contour; S2, establishing the gradient intensity energy field by calculating the gradient intensity values extracted from all points of the edge of the target object; S3, establishing the gradient direction energy field by calculating the consistency between the tangential direction of each point in the initial contour and the tangential direction of each point extracted from the edge of the target object; and S4, overlapping the three energy fields established in S1-S3 to obtain a new energy field, carrying out global optimization, and obtaining an accurate contour of the target object. The invention gives more accurate and complete expression of target image contour under the condition of target image geometrical information in the known image, thus not only completely maintaining the geometrical characteristics of the target image, but also enriching the contour details.

Description

technical field [0001] The invention belongs to the technical field of image processing, in particular to an active contour method and system based on shape constraints and direction fields. Background technique [0002] In recent years, with the development of computer hardware and software technology and the popularization of a large number of image and video equipment, computer vision technology has become a hot field of computer research. Among them, the detection, extraction and processing of specific objects in image and video data have high practical value and technical significance. The object detection methods provided by the current vision technology are usually aimed at texture and regional features, such as the Haar feature method for face detection, the signal processing method for flame detection, etc., which often can only provide the processor with a specific object position and The rough estimation of the area, but the more accurate estimation and extractio...

Claims

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Application Information

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IPC IPC(8): G06T5/00G06T7/00
Inventor 胡事民程明明张方略
Owner TSINGHUA UNIV
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