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Image acquisition method, focusing depth measuring method and measuring device

一种聚焦深度、测量方法的技术，应用在光学成像领域，能够解决图像采集效率低等问题，达到节约采集时间、克服无法动态连续变焦、提高采集效率的效果

Inactive Publication Date: 2021-11-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In view of this, the present invention provides an image acquisition method based on the dynamic zoom characteristics of liquid crystal lenses, a focus depth measurement method and a measurement device to solve the problem of low image acquisition efficiency in the process of scene depth measurement existing in the prior art

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  • Image acquisition method, focusing depth measuring method and measuring device
  • Image acquisition method, focusing depth measuring method and measuring device

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Embodiment 1

[0048] Embodiment 1 of the present invention discloses an image acquisition method based on the dynamic zoom characteristic of a liquid crystal lens, the image acquisition method adopts such as figure 1 and figure 2 The image acquisition device shown is used for acquisition. The image acquisition device includes a liquid crystal lens, a glass lens, and an image sensor from left to right. Face to face contact. The liquid crystal lens is located at the diaphragm position of the image acquisition device, and the focal length of the glass lens is 8mm.

[0049] The structure of the liquid crystal lens is as Figure 4 As shown, it includes a third substrate, a first ITO electrode, an ultraviolet glue, a Cr electrode, a second substrate, a liquid crystal layer, and a second ITO arranged in sequence along the light transmission direction of the lens (the light transmission direction is a direction perpendicular to the liquid crystal layer). electrodes and a first substrate. In ad...

Embodiment 2

[0068] Embodiment 2 of the present invention discloses a focus depth measurement method based on the dynamic zoom characteristics of liquid crystal lenses. The measurement method includes three steps. The first step is image collection, and the second step is to collect the focus of each pixel in each image. Evaluation value, the third step is to collect the scene depth of each pixel through the DFF algorithm.

[0069] The first step image acquisition method of embodiment 2 is the same as the acquisition method in embodiment 1, the voltage V1 and V2 are adjusted to change the characteristics of the liquid crystal lens from the positive lens to the negative lens, and zoom from the beginning of the liquid crystal lens to the beginning of zooming of the liquid crystal lens In the last 4 seconds, the image sensor is controlled to collect an image every 1 / 15 second, and a total of 60 images are collected, and the magnification ratio of each image in the 60 images is the same.

[00...

Embodiment 3

[0080] Embodiment 3 of the present invention discloses an image acquisition method based on the dynamic zoom characteristic of a liquid crystal lens. The difference between the image acquisition method in Embodiment 3 and the image acquisition method in Embodiment 1 is that the image used in the image acquisition method in Embodiment 3 The liquid crystal lens in the acquisition device deviates from the diaphragm position of the system. The image acquisition method in embodiment 3 is the same as the image acquisition method in embodiment 1 except for the above differences. Since the liquid crystal lens in embodiment 3 deviates from the aperture position of the system, the magnification ratios of the 60 images collected by the image sensor in embodiment 3 are different, that is, the magnification ratios of the pixels in each image are different.

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Abstract

The invention relates to the technical field of optical imaging, solves the problem of low image acquisition efficiency in the focusing depth measurement technology, and provides an image acquisition method, a focusing depth measurement method and a measurement device. The depth measurement method comprises the following steps: enabling the liquid crystal lens to receive a first driving voltage; switching the first driving voltage received by the liquid crystal lens into a second driving voltage; enabling the liquid crystal lens to continuously zoom in response to switching from the first driving voltage to the second driving voltage; collecting a series of images of different focusing objects in the same scene in the zooming process of the liquid crystal lens; collecting a focusing evaluation value of each pixel point in each image; and collecting the scene depth of each pixel point. The dynamic zooming characteristic of the liquid crystal lenses is found, the liquid crystal lenses are in the lens state in the collecting process, the imaging aberration is smaller than 0.1, images can be collected without waiting for the liquid crystal lenses to finish zooming, and therefore the collecting efficiency is improved.

Description

[0001] This application is a divisional application of an invention patent application submitted on May 22, 2019, with the title of the invention "Focus Depth Measuring Method and Measuring Device" and the application number 201910427957.7. technical field [0002] The invention belongs to the technical field of optical imaging, in particular to an image acquisition method, a focus depth measurement method and a measurement device. Background technique [0003] There are many studies on zooming through electronically controlled liquid crystal lenses, such as: [0004] The paper "Research on Super-resolution Performance and Axial Scanning Technology of Confocal System Based on Birefringence Principle" (Prior Art 1) published on June 1, 2009, studied the The focal length of the liquid crystal lens changes. [0005] Published on May 1, 2016, the paper "Research on Fabrication and Imaging Detection of Graphene-Based Liquid Crystal Microlens Array" (Prior Art 2), which selected ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13G02F1/29G01M11/02
CPCG02F1/1309G01M11/02G02F1/294
Inventor 叶茂
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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