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Depth of Focus Measuring Method and Measuring Device

A technology of focus depth and measurement method, which is applied in the field of optical imaging, can solve the problems of low image acquisition efficiency, achieve the effects of saving acquisition time, improving acquisition efficiency, and overcoming the inability to dynamically and continuously zoom

Active Publication Date: 2021-08-31
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

[0011] In view of this, the present invention provides a focus depth measurement method and measurement device based on the dynamic zoom characteristics of liquid crystal lenses to solve the problem of low image acquisition efficiency in the process of scene depth measurement in the prior art

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  • Depth of Focus Measuring Method and Measuring Device
  • Depth of Focus Measuring Method and Measuring Device

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Embodiment 1

[0046] 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 8 mm.

[0047] 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 a...

Embodiment 2

[0066] 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.

[0067] 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

[0078] 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 focus depth measurement technology, and provides a focus depth measurement method and a measurement device. The depth measurement method includes the following steps: the liquid crystal lens receives a first driving voltage; the first driving voltage received by the liquid crystal lens is switched to a second driving voltage; in response to switching from the first driving voltage to the second driving voltage, the liquid crystal lens zooms continuously ; Collect a series of images of different focus objects in the same scene during the zooming process of the liquid crystal lens; collect the focus evaluation value of each pixel in each image; collect the scene depth of each pixel. The present invention discovers the dynamic zoom characteristics of the liquid crystal lens. During the collection process, the liquid crystal lenses are respectively in the lens state and the imaging aberration is less than 0.1. The present invention overcomes the technical prejudice that the liquid crystal lens cannot dynamically and continuously zoom, so there is no need to wait for the liquid crystal lens to complete the zoom After the image is collected, the collection efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of optical imaging, in particular to a focus depth measurement method and a measurement device based on the dynamic zoom characteristic of a liquid crystal lens. Background technique [0002] There are many studies on zooming through electronically controlled liquid crystal lenses, such as: [0003] 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. [0004] 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 multiple sets of different fixed voltage values ​​to observe and measure the focal length change of the microlens array Condition. [0005] Published on March 10, 2017, the paper "Research on Rapid Respon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13G02F1/29G01M11/02
CPCG02F1/1309G01M11/02G02F1/294
Inventor 叶茂陈晓西郑力铭张亚磊
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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