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Method for collecting and processing ice core optical characteristic image

A technology of image acquisition and processing and optical characteristics, applied in the field of image processing, can solve the problems that researchers cannot preserve the original information of ice cores, and achieve good results

Inactive Publication Date: 2018-02-16
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these devices cannot resist the harsh environment of the polar regions, and can only be used in laboratories, which cannot allow researchers to preserve the original information of ice cores in the first place

Method used

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  • Method for collecting and processing ice core optical characteristic image
  • Method for collecting and processing ice core optical characteristic image
  • Method for collecting and processing ice core optical characteristic image

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] see figure 1 , which is a flow chart of the steps of the ice core optical characteristic image acquisition and processing method according to Embodiment 1 of the method of the present invention, including the following steps:

[0049] S10, taking multiple pictures of the ice core;

[0050] S201, image preprocessing, using a histogram equalization method to non-linearly stretch the ice core photo, and redistribute pixel values;

[0051] S202, image matching area positioning, determining overlapping areas of two adjacent photos, and extracting and registering feature points;

[0052] S203, image feature extraction, corner detection using FAST function;

[0053] S204, image feature matching, using the Euclidean distance between two feature point descriptors as a similarity criterion for feature point matching;

[0054] S205, image fusion, using weighted average fusion to perform seamless stitching after image smooth transition;

[0055] S30, performing optical analysis...

Embodiment 2

[0059] S201 Image preprocessing includes the following steps:

[0060] The first step is to count the number of pixels n of each gray level of the original input image i , i=0,1,...L-1, where L is the total number of gray levels;

[0061] Step 2: Calculate the original image histogram, that is, the probability density Pi of each gray level, obtained according to the following formula,

[0062]

[0063] Among them, n is the total number of pixels of the original image, r i is the gray level i;

[0064] Step 3: Calculate the cumulative distribution function s k , obtained according to the following formula,

[0065]

[0066] Step 4: Calculate the final output gray level gk, obtained according to the following formula,

[0067] g k =INT[(L-1)s k (r k )+0.5] / (L-1),

[0068] Among them, INT[] is the integer operator.

[0069] Due to the high light transmittance of ice cores, the photos taken are generally brighter. Therefore, the gray value of the original image of...

Embodiment 3

[0071] S203 image feature extraction comprises the following steps:

[0072] Step 1: Take a pixel p as the center and select 16 pixel points on a circle with a radius of 3, and make a difference with the pixel value of the center point, and obtain the number satisfying the inequality according to the following formula,

[0073]

[0074] Among them, I(x) is the pixel value of the pixel point on the side, I(p) is the pixel value of the center point, ε d is the set threshold, and N is the number satisfying the inequality;

[0075] Step 2: If N>12, then this point is used as a candidate corner point, otherwise, delete it;

[0076] Step 3: Perform non-maximum value suppression on the image. If there are multiple feature points in a neighborhood centered on feature point p, judge the score of each feature point. If p is the highest score of all feature points in the neighborhood , then keep it; otherwise, delete it; if there is only one feature point in the neighborhood, keep i...

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Abstract

The invention discloses a method for collecting and processing an ice core optical characteristic image. The method comprises the following steps: shooting a plurality of ice core photos; carrying outimage splicing on the plurality of ice core photos; and carrying out an optical analysis on the spliced panoramic ice core image. The method is characterized in that the step of carrying out image splicing is performed as follows: carrying out image preprocessing; to be specific, carrying out non-linear stretching on the ice core photos by using a histogram equalization method and allocating a pixel value again; carrying out image matched region positioning; to be specific, determining an overlapped region between each two photos and carrying out feature point extraction and registration; carrying out image feature extraction; to be specific, carrying out corner detection by using a FAST function; carrying out image feature matching; to be specific, using an Euclidean distance between twofeature point descriptors as a similarity criterion for feature point matching; and carrying out image fusion; to be specific, carrying out smooth image transition by means of weighted average fusionand then carrying out seamless splicing. According to the invention, in order to solve a problem of a few of ice core feature points, the method employs an improved image splicing method and thus anice core panorama is synthesized efficiently and rapidly.

Description

technical field [0001] The invention belongs to the field of image processing, in particular to a method for collecting and processing ice core optical characteristic images. Background technique [0002] Ice cores are cylinders of ice drilled down from the upper part of a glacier by ice drills. Various substances and chemical components deposited into the glacier during the snowfall process, including aerosol particles, volcanic dust, radioactive substances and their isotopes, atmospheric components, solid and gas components emitted by humans, etc., can all be preserved in ice core records[ 1]. Using dating technology and laboratory analysis, the changes of different climate and environment indicators in ice cores can be obtained, and the time change process of climate and environment on different time scales in the past can be reconstructed. As the carrier of climate and environmental information, ice cores have the advantages of strong fidelity, large amount of informat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/20G06K9/62G06K9/46G06T3/40G06T5/40G06T7/00G06T7/33G06T7/62
CPCG06T3/4038G06T5/40G06T7/0002G06T7/33G06T2207/20221G06T2207/10004G06V10/10G06V10/758G06V10/44
Inventor 史剑光董天骄于海滨贝琛圆江晓营方全刘敬彪安春雷
Owner HANGZHOU DIANZI UNIV
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