Device and method for detecting optical properties of tissue of agricultural products through space frequency domain imaging

A technology of spatial frequency domain imaging and optical properties, which can be used in measuring devices, color/spectral property measurement, material analysis through optical means, etc., and can solve problems such as inability to accurately obtain optical properties

Active Publication Date: 2016-04-20
ZHEJIANG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a device and method for detecting the optical characteristics of agricultural product tissue by using space frequency domain imaging in the field of agricultural engineering, using the optical imaging technology of space frequency domain imaging to quantitatively obtain The ...

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  • Device and method for detecting optical properties of tissue of agricultural products through space frequency domain imaging
  • Device and method for detecting optical properties of tissue of agricultural products through space frequency domain imaging
  • Device and method for detecting optical properties of tissue of agricultural products through space frequency domain imaging

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Embodiment 1

[0097] Experimental operation and data processing steps of embodiment 1:

[0098] Turn on the system, warm up the DLP projector for 10 minutes, debug the image periodic acquisition software and digital signal generator at the same time, set the image acquisition cycle, and fix the reference whiteboard with the sample clamp;

[0099] After the warm-up is completed, start the PowerPoint automatic playback and image periodic acquisition software at the same time, and collect 49 images at 460nm. After the completion, change the wavelength, and perform image acquisition at 527nm and 630nm in turn;

[0100] Replace the optical solid Phantom, and collect images at three wavelengths in sequence; turn off the DLP projector, and collect dark field images; turn off the system, and select the image ROI (50×40pixels);

[0101] Obtain the diffuse reflection image of the solid Phantom through demodulation; obtain the absorption coefficient μ of each pixel in the ROI through nonlinear fitting...

Embodiment 2

[0106] On the basis of the above-mentioned optical solid Phantom experiment, embodiment 2 selects red Fuji apple for further experiments, and the experimental setting parameters remain unchanged. The specific operation and data processing steps are as follows:

[0107] Turn on the system, warm up the DLP projector for 10 minutes, debug the image periodic acquisition software and digital signal generator at the same time, set the image acquisition cycle, and fix the reference whiteboard with the sample clamp;

[0108] After the warm-up is completed, start the PowerPoint automatic playback and image periodic acquisition software at the same time, and collect 49 images at 460nm. After the completion, change the wavelength, and perform image acquisition at 527nm and 630nm in turn;

[0109] Replace apple tissue slices, and sequentially collect images at three wavelengths; turn off the DLP projector, and collect dark field images; turn off the system, and select image ROI (40×60pixel...

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Abstract

The invention discloses a device and a method for detecting optical properties of tissue of agricultural products through space frequency domain imaging. The device comprises a light source system arranged in a camera obscura, an imaging system and a sample fixing and adjusting device, wherein images are collected by means of a white reference board and a detection object in a camera obscura environment under the condition of different wave lengths, dark field images are obtained, an image ROI is selected from the dark field images, diffuse reflection images of the detection object at different space frequencies are obtained through demodulation treatment, and an absorption coefficient and a reduced scattering coefficient of each pixel point of the image ROI are obtained after treatment with a nonlinear fitting method. The optical property change condition of tissue in the described ROI is acquired quantitatively with a non-contact single measurement method, the device and the method have the advantages of wide covered detection range, simplicity in operation and low cost, the defect caused by the fact that the optical properties of only an extremely small part are acquired due to single point light source illumination is avoided, and the space representation problem of the optical properties of the tissue of the agricultural products is solved.

Description

technical field [0001] The invention relates to a detection device and method for agricultural product tissue, in particular to a device and method for detecting the optical characteristics of agricultural product tissue by using space frequency domain imaging. Background technique [0002] Visible-near-infrared spectroscopy (Vis-NIR) technology, as a non-destructive testing method for the quality and safety of agricultural products, has been extensively studied and reported. This type of technology usually obtains the absorption, reflection or transmission signals after light interacts with biological tissues, and through later chemometric and statistical analysis, models are modeled with indicators such as sugar acidity and hardness, so as to achieve the purpose of quality inspection; but , the generality of the established model is insufficient. This is because spectroscopic techniques fail to correctly analyze the transmission mechanism of light in biological tissues, a...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/01
CPCG01N21/01G01N21/314G01N2021/3148
Inventor 应义斌胡栋傅霞萍何学明李庭苇
Owner ZHEJIANG UNIV
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