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Method and device for measuring size of mobile phone based on laser ranging and image comparison

A technology of laser distance measurement and image comparison, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of low measurement accuracy, low work efficiency, and high work intensity, and achieve high measurement accuracy, flexible use, and easy operation. easy effect

Inactive Publication Date: 2018-12-21
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
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Problems solved by technology

[0002] In daily life, it is necessary to use measuring tools to measure the appearance size of objects. Sometimes it is necessary to measure the size of trees, buildings and objects with large sizes. The existing size measurement methods are mainly measured by tools such as tape measure. Heavy workload and low work efficiency
In addition, in the process of house decoration, it is also necessary to measure the size of the doors and windows of the house, and the existing manual measurement is usually carried out by workers with hand-held measuring tools, which is not only labor-intensive, but also low in efficiency and low in measurement accuracy.

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  • Method and device for measuring size of mobile phone based on laser ranging and image comparison
  • Method and device for measuring size of mobile phone based on laser ranging and image comparison

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Embodiment 1

[0044] Embodiment 1: a method for measuring the size of a mobile phone based on laser ranging and image comparison, comprising the following steps:

[0045] (1) Shoot multiple groups of images of objects whose actual size and shooting distance are known, store the captured images in an image database, and use the shooting distance of the shooting object as a condition item for classification and induction.

[0046]Image analysis is the extraction of certain useful metrics, data or information from images. The purpose is to get some kind of numerical result, not to produce another image. The content of image analysis overlaps with the research fields of pattern recognition and artificial intelligence, but image analysis is different from typical pattern recognition. Image analysis is not limited to classifying a specific area in an image into a fixed number of categories, it mainly provides a description of the image being analyzed. To this end, it is necessary to use both pa...

Embodiment 2

[0056] Embodiment 2: A method for measuring the size of a mobile phone based on laser ranging and image comparison. The difference between this embodiment and Embodiment 1 is that the captured image is subjected to feature extraction processing of the object to be measured, and then the feature of the object to be measured is extracted. The extracted image is compared with the images in the image database, such as Figure 7 and Figure 8 As shown, the feature extraction processing method of the object to be measured is to add an outer contour outside the actual contour of the object to be measured, add an inner contour inside the actual contour of the object to be measured, and cut the space between the outer contour and the inner contour into many straight line, and take M points on each of the N straight lines, a bounded area of ​​M×N points can be obtained, and then find the contour with the minimum energy according to the snake model formula in the bounded area, and get T...

Embodiment 3

[0063] Embodiment 3: A method for measuring the size of a mobile phone based on laser ranging and image comparison. The difference between this embodiment and Embodiment 2 is that the feature extraction processing method of the object to be measured is to construct an energy functional function for the captured image;

[0064]

[0065] Use the Taylor formula to expand, and then according to the step-by-step integration method, it can be obtained;

[0066]

[0067] Then the minimum value of the energy functional function can be obtained through iterative operation. For the two-dimensional variational problem in image processing, the gradient descent flow can be expressed as

[0068]

[0069] Finally, the analytical solution is obtained. Applying this algorithm can improve the contrast of the image, increase the detailed texture information in the image, analyze the clear edge details, obtain the edge contour of each image, obtain the edge contour of the object to be mea...

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Abstract

The invention discloses a method and device for measuring a size of a mobile phone based on laser ranging and image comparison. The method comprises the following steps: taking a plurality of images of an object of known actual size and photographing distance, storing the photographed images in an image database, and classifying by regarding the photographing distance of the photographed object asa condition item; aiming the mobile phone at the object to be tested, activating a laser transmitter of the mobile phone, and calculating the laser reflection time by the mobile phone to obtain the photographing distance; photographing the object by the mobile phone to obtain images of the object to be tested; comparing the images and the photographing distance of the object to be tested with theimages in the image database to obtain a contrast image of the closest distance; and obtaining the data of actual size of the object to be tested by calculation according to the size ratio of the images of the object to be tested and the contrast image. The invention measures the appearance size of the object by means of contrast analysis of the mobile phone, which is not only easy to operate, flexible in use, but also has high measurement precision and very good practical effect.

Description

technical field [0001] The invention relates to a method for measuring the size of an object, in particular to a method and a device for measuring the size of a mobile phone based on laser ranging and image comparison. Background technique [0002] In daily life, it is necessary to use measuring tools to measure the appearance size of objects. Sometimes it is necessary to measure the size of trees, buildings and objects with large sizes. The existing size measurement methods are mainly measured by tools such as tape measure. The workload is heavy and the work efficiency is low. In addition, in the process of house decoration, it is also necessary to measure the size of the doors and windows of the house, and the existing manual measurement is usually carried out by workers with hand-held measuring tools, which is not only labor-intensive, but also low in efficiency and low in measurement accuracy. Contents of the invention [0003] The object of the present invention is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00
CPCG01B11/00
Inventor 徐弼军田克汉潘卫清职亚楠
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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