Non-destructive testing method for plum hardness based on visible/near-infrared spectroscopy

A near-infrared spectrum and non-destructive testing technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of large labor expenditure, long modeling cycle, complicated modeling process, etc., and achieve the effect of reducing interference

Inactive Publication Date: 2019-02-15
GUIYANG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

There are related patents that use hyperspectral imaging technology to detect fruit firmness (hyperspectral-based mango firmness prediction method after impact damage, CN201710738975.8; a non-destructive test method for pear firmness, CN201410630019.4), all need to first use the characteristic wa

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  • Non-destructive testing method for plum hardness based on visible/near-infrared spectroscopy
  • Non-destructive testing method for plum hardness based on visible/near-infrared spectroscopy
  • Non-destructive testing method for plum hardness based on visible/near-infrared spectroscopy

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Embodiment 1

[0031] 1. In this embodiment, a batch of 120 uniformly sized and intact red plums and 60 green plums were selected in the local Wal-Mart supermarket, a total of 180 plum samples; all samples were numbered in sequence, and the hyperspectral image acquisition system was used to collect the plum samples. Hyperspectral image, where the exposure time of the CCD camera is 12.6ms, the distance between the camera lens and the sample is 40cm, and the moving speed of the electric translation stage is 1.35cm / s;

[0032] The image acquisition process is controlled by Spectral SENS (Spectral Imaging Ltd., Finland) software, the spectral range is 400-1000nm, and there are 256 bands in this range;

[0033] Black and white correction is performed on the hyperspectral image of the plum sample collected, that is, under the same system conditions as the sample collection, first scan the standard white calibration plate to obtain a full white calibration image W; then, cover the camera lens cover ...

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Abstract

The invention discloses a non-destructive testing method for plum hardness based on a visible/near-infrared spectroscopy. The method comprises the following steps: collecting different varieties of fresh plum samples, and using a hyperspectral image collecting system to collect hyperspectral images of plum samples; performing a black-and-white correction on hyperspectral images, and using median filtering and mathematical morphology processing method to construct mask images to extract an average spectral reflectance of the whole fruit region of plums; using an SPXY algorithm to divide the acquired spectral data into a calibration set and a testing set, preprocessing the spectral data by Standard Normal Variate (SNV) to obtain a spectral database of a calibration and test sample set; usinga digital fruit hardness tester to measure and calibrate and test the hardness values of the plum samples in the sample set; combining the Principal Component Regression method (PCR) with stoichiometry to establish a prediction model of plum hardness. The non-destructive testing method for the plum hardness based on the visible/near-infrared spectroscopy is capable of detecting plum hardness quickly and non-destructively based on the visible/near infrared spectroscopy.

Description

technical field [0001] The invention relates to the technical field of non-destructive detection of fruit internal quality, in particular to a method for non-destructive detection of plum hardness based on visible / near-infrared spectroscopy. Background technique [0002] The plum fruit is plump, the juice is sweet, the meat is crispy and the taste is sour, it can promote the secretion of gastric acid and gastric digestive enzymes, and has the effect of promoting digestion; moreover, the plum pulp is rich in amino acids, which has the effect of diuresis and swelling, and can be used as an auxiliary treatment for liver cirrhosis effect; in addition, plum pulp contains a variety of nutrients, and regular consumption can also play a very good role in beautifying and nourishing the skin, so it is very popular among people. [0003] The hardness of plums is one of the important indicators for judging their maturity. Since plums are typical climacteric fruits, the pulp of plums is ...

Claims

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Application Information

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IPC IPC(8): G01N21/25
CPCG01N21/25
Inventor 尚静张艳孟庆龙
Owner GUIYANG UNIV
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