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A method for evaluating the degree of focus of an auto-focus image

An evaluation method and focal map technology, applied in image analysis, image enhancement, image data processing, etc., can solve problems such as peak collapse, and achieve good unbiased and high practical value.

Active Publication Date: 2019-05-07
ZHEJIANG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to propose a method for evaluating the quasi-focus degree of an auto-focus image in view of the problem of peak collapse when using the phase consistency method as the focus evaluation function

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  • A method for evaluating the degree of focus of an auto-focus image
  • A method for evaluating the degree of focus of an auto-focus image
  • A method for evaluating the degree of focus of an auto-focus image

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Embodiment Construction

[0025] The present invention is an evaluation method for the quasi-focus degree of an auto-focus image. The method adopts the method of combining the phase consistency map and the gradient map, and solves the problem of peak collapse when the phase consistency method is used as the focus evaluation function. The scene or the scene with low signal-to-noise ratio or changing brightness has good performance, high practical value, wide application range, good unbiasedness, unimodality, sensitivity, and stability.

[0026] Describe in detail below in conjunction with accompanying drawing and example:

[0027] figure 1 It is a simple flow chart of the method of the present invention. The present invention will be further described below in conjunction with embodiment.

[0028] This embodiment takes a set of simulated defocus sequence diagrams as an example, figure 2 It is a schematic diagram of randomly selecting 5 images in a group of defocus sequence images, where (a)-(e) are ...

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Abstract

The invention discloses an automatic focusing image focusing degree evaluation method. The method adopts a phase consistency image and gradient image combined method, solves the problem of peak collapse caused when a phase consistency method is adopted as a focusing evaluation function, has good expression performance no matter in a normal scene, or a scene, where signal-to-noise ratio is low or brightness is changed, is high in practical value, and has the advantages of good unbiasedness, unimodality, sensitivity and stability.

Description

technical field [0001] The invention relates to an image quality evaluation method, in particular to an evaluation method for the quasi-focus degree of an auto-focus image. Background technique [0002] With the rapid development of digital image and multimedia technology, there are more and more various types of optical imaging systems, and autofocus technology plays a vital role in optical imaging systems. There are two main types of auto focus technology, namely active focus and passive focus. Active focusing needs to add an additional ranging system to the system, which increases the cost and complexity of the system. At the same time, for scenes with glass or occluded objects, there will be problems with ranging. Therefore, active focusing technology is slowly Superseded by autofocus technology. [0003] Passive focusing is to judge the degree of defocus by analyzing the degree of blur of the image obtained during the focusing process, thereby guiding the focusing pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00
CPCG06T7/0002G06T2207/10004G06T2207/30168
Inventor 冯华君王烨茹徐之海李奇陈跃庭
Owner ZHEJIANG UNIV
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