Method for realizing non-destructive test of waxing kinds of apple surfaces

A non-destructive testing and apple technology, applied in the direction of color/spectral characteristic measurement, etc., can solve problems harmful to human health, achieve the effect of reducing independent variables and simple operation

Inactive Publication Date: 2015-03-11
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

[0004] Aiming at the problem that industrially waxed apples are harmful to human health, the present invention proposes a method for non-destructive detection of waxed apple surfaces, which is not only easy to operate, does not need to destroy apple tissues, and detects quickly and accurately, providing a method for identifying waxed apple surfaces. Types of scientific basis, online testing is carried out before apples are listed, so that some unscrupulous traders can’t market apples with industrial wax, which can ensure the quality of apples sold in the market

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  • Method for realizing non-destructive test of waxing kinds of apple surfaces
  • Method for realizing non-destructive test of waxing kinds of apple surfaces
  • Method for realizing non-destructive test of waxing kinds of apple surfaces

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[0021] A method for non-destructive detection of the waxing type on the surface of apples. Example: Washing Shaanxi Red Fuji apples purchased from a supermarket with salt water at a temperature of 40-50 degrees Celsius to ensure that the original wax on the surface is cleaned. At room temperature, the same amount of Shaanxi Red Fuji apples were artificially painted with industrial wax and edible wax respectively. After standing still for 48 hours, hyperspectral images were taken separately. Sequential projection algorithm (SPA) was used to extract the characteristic wavelengths for identifying waxing types on the apple surface, and linear discriminant analysis (LDA) was used to establish typical discriminant functions. In subsequent measurements, it is only necessary to obtain the reflectance at the characteristic wavelength of the test sample, combined with the typical discriminant function, the non-destructive testing of apples with unknown waxing types can be realized.

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Abstract

The invention relates to a method for realizing non-destructive test of waxing kinds of apple surfaces. The method comprises the following steps: shooting hyperspectral images of the apple surfaces by using a visible near infrared hyperspectral imaging system, so that the image information and the spectral information of apples can be obtained at the same time, transforming spectral response under each wave length to corresponding reflectivity by using black and white plate correction, extracting the characteristic wave length for identifying the waxing types of the apple surfaces by using a continuous projection algorithm SPA, establishing a typical discriminant function by a linear discriminant analysis (LDA) method, and realizing the non-destructive test of the apples with unknown waxing types by combining matlab programming. The method disclosed by the invention has the advantages that the operation is simple, apple tissue is not required to be destructed, the test is quick and accurate, a scientific basis is provided for identifying the waxing types of the apple surfaces, and before the apples appear on the market, an on-line test is performed, so that the quality of the apples sold in the market is ensured.

Description

technical field [0001] The invention relates to a substance detection method, in particular to a method for non-destructive detection of waxed species on the surface of apples. Background technique [0002] China is a big fruit producing country, and the inspection of fruit quality and safety has always been an issue that China needs to pay attention to. This is the key to improving the nutritional quality of fruits in our country. Among many nutritious fruits, apple has high nutritional value. It can not only regulate gastrointestinal function, lower cholesterol, lower blood pressure, prevent cancer, lose weight, but also enhance children's memory. However, waxing apples is now very common. Edible waxing is a legal fresh-keeping technology that is allowed by the state, but unscrupulous traders apply industrial wax on the surface of apples, which will make eating apples harmful to the human body, which will seriously affect the health of consumers. [0003] At present, dom...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 李柏承周瑶侯宝路赵曼彤徐邦联王琦张大伟黄元申
Owner UNIV OF SHANGHAI FOR SCI & TECH
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