Meat quality polarization hyperspectral image acquisition device

Abstract

The utility model discloses a kind of meat quality polarization hyperspectral image acquisition devices, including illumination light source, monochromator, polarizing module, meat sample, sample stage, camera, imaging lens, polarizing module, control module and computer. Illumination light source produces visible and near-infrared spectrum illumination light, wavelength adjustable monochromatic light is formed by monochromator filtering, it becomes linear polarized light after polarizing module, it is detected by polarizing module after being reflected by sample, and it is collected to become image by imaging lens and camera, transmission to computer storage and carry out after the process processing. The utility model can obtain the spectrum and polarization information of meat sample by introducing monochromator and polarizing module / polarizing module, with the characteristics of simple structure, easy operation, can provide a basic experimental platform for the inspection meat quality and freshness based on polarization hyperspectral technology.

Description

Technical Field

[0001] This utility model belongs to the field of food safety testing and relates to a device for acquiring polarized hyperspectral images of meat quality. Background Technology

[0002] Meat, as a major source of protein, occupies an increasingly large proportion of food, making its quality testing a crucial measure to ensure food safety. Researchers have developed various techniques, among which polarization imaging and hyperspectral imaging, based on machine vision technology, can characterize meat quality by collecting polarization and spectral information from meat samples. These techniques are rapid and non-destructive, attracting considerable attention and representing a cutting-edge direction in the field of food safety testing.

[0003] Currently, polarization imaging and hyperspectral imaging systems are generally complex in structure and cumbersome in operation. Meanwhile, deep learning-based image processing algorithms require massive amounts of sample data, which places high demands on image acquisition efficiency. There is an urgent need for a fully automated polarization hyperspectral image acquisition device to provide a data foundation for subsequent analysis. Summary of the Invention

[0004] To address the aforementioned issues, this invention discloses a device for acquiring polarized hyperspectral images of meat quality, enabling rapid acquisition of polarized hyperspectral images.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A polarization hyperspectral image acquisition device for meat quality includes an illumination source, a monochromator, a polarization module, a camera, an imaging lens, a polarization analyzer, a control module, a computer, a meat sample, and a sample stage. The illumination source uses electric heating to generate continuous spectral illumination in the visible to near-infrared band. The monochromator selects the illumination wavelength, and the polarization and analyzer modules are used to adjust the polarization state of the illumination and detection light. By automatically changing the wavelength and polarization state configuration, polarization hyperspectral images of the meat sample can be quickly obtained.

[0007] Furthermore, the lighting source uses halogen lamps, is powered by DC, and the switching of the light source can be controlled by the control module, producing a spectral range of illumination light covering the visible and near-infrared bands.

[0008] Furthermore, monochromators are used to select the frequency of continuous spectrum incident light, and can automatically change the wavelength of the emitted light, with the accurate wavelength value controlled by a computer.

[0009] Furthermore, the polarization module consists of an electric turntable and a linear polarizer. The electric turntable is controlled by the control module and can rotate the linear polarizer 360 degrees to change and control the polarization state of the emitted light. The module communicates with the computer via the RS232 protocol.

[0010] Furthermore, the polarization detection module and the polarization initiation module are completely identical in composition.

[0011] Furthermore, the camera and imaging lens together form an image acquisition device, which collects the reflected light from the meat sample after polarization analysis to form an image.

[0012] Furthermore, the computer obtains images captured by the camera via a gigabit network interface and stores them on the hard drive for subsequent data processing.

[0013] The beneficial effects of this utility model are:

[0014] The device uses an electric turntable to control the orientation of the polarizer in the polarization and analysis modules, combined with an electrically adjustable wavelength monochromator, to achieve rapid and efficient acquisition of sample polarization hyperspectral images. Compared with existing independent polarization imaging systems and hyperspectral imaging systems, it has higher efficiency and helps to establish datasets of polarization hyperspectral images of different samples. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of a polarization hyperspectral image acquisition device for meat quality provided by this utility model.

[0016] Figure 2 This is a schematic diagram of the biasing module.

[0017] Figure 3 for Figure 2 A top view of the electric turntable.

[0018] Figure 4 This is a flowchart illustrating the workflow.

[0019] List of reference numerals in the attached diagram:

[0020] 1-Illumination source, 2-Monochromator, 3-Polarization module, 4-Camera, 5-Imaging lens, 6-Polarization analyzer module, 7-Control module, 8-Computer, 9-Meat sample, 10-Sample stage, 31-Polarizer, 32-Electric turntable. Detailed Implementation

[0021] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0022] like Figure 1As shown, the present invention provides a structure for a polarization hyperspectral image acquisition device for meat quality, comprising an illumination source 1, a monochromator 2, a polarization module 3, a camera 4, an imaging lens 5, a polarization analyzer 6, a control module 7, a computer 8, a meat sample 9, and a sample stage 10. The illumination source emits a beam of light that, after passing through the monochromator and polarization module, forms a linearly polarized monochromatic beam that illuminates the meat sample. The reflected light, carrying sample information, is then captured by the camera. By automatically scanning the wavelength and polarizer orientation, a polarization hyperspectral image can be acquired.

[0023] Specifically, the lighting source 1 is a halogen lamp that can emit a continuous spectrum in the visible and near-infrared regions, with an operating temperature above 1000℃, a power of above 10W, and a DC power supply with an operating voltage of 24V.

[0024] Monochromator 2 uses a grating for spectral dispersion. Utilizing the diffraction principle of the grating, it separates polychromatic light into different wavelengths in space, forming a spectrum. Different wavelengths of monochromatic light are sequentially emitted from the exit slit. By adjusting the grating angle, the desired wavelength of light can be emitted from the exit slit. It boasts repeatability better than 0.2 nm, resolution better than 0.1 nm, and a grating dispersion range of 330-1000 nm. It connects to a computer via RS232 protocol. The computer sends commands to control the monochromator grating angle, changing the wavelength of the emitted light to create an adjustable wavelength illumination source.

[0025] The polarization module 3 consists of a polarizer 31 and an electric turntable 32, such as... Figure 2 and Figure 3 As shown, light can be emitted through polarizer 31 and motorized turntable 32. The motorized turntable 32 consists of a stepper motor and a turntable. The stepper motor drives the turntable to rotate via a worm gear, changing the angle of polarizer 31. The rotation resolution is better than 0.1°, and the accuracy is better than 0.5°. The turntable's rotation axis has a hollow structure, allowing light to pass through. An absolute zero position is provided for easy reset and repositioning of the polarizer 32 upon power-on. Polarizer 31 is composed of dichroic material, absorbing polarized light perpendicular to the specified polarization direction to form linearly polarized light. The optical axis of the polarizer is approximately coincident with the mechanical axis of the turntable, ensuring that the emitted light can illuminate the sample.

[0026] Camera 4 uses a CMOS monochrome industrial camera, connects to computer 8 via gigabit network, has no less than 5 million pixels, a transmission rate of no less than 100M / s, adjustable exposure time and gain, and can be used for secondary development and external triggering functions.

[0027] The imaging lens 5 has a transmittance of over 90% in the visible and near-infrared bands, and the magnification is adjustable from 0.35 to 2 times. The surface of the meat sample and the detection plane of the camera 4 are located at the conjugate position of the imaging lens, ensuring that the camera can effectively detect the surface image of the meat sample.

[0028] The polarization analyzer module 6 has the same structure as the polarization generator module 3 and is used to modulate the polarization state of the reflected light.

[0029] Control module 7 includes the power supply, control of the electric turntable stepper motor in the polarization and detection module, and control of the lighting source's on / off state. The power supply uses a switching power supply with a 220V AC input and 5V and 24V DC outputs. The stepper motor control uses a closed-loop controller, which can input angle encoder information to improve control accuracy. The lighting source's on / off state is controlled using solid-state relays.

[0030] Computer 8 uses a regular personal desktop computer and connects to camera 4 via a gigabit network interface to read and store images in real time. The motherboard has an empty PCI slot, which can be used to install a PCI motion control card. It sends pulses to the stepper motor driver in the control module to control the rotation of the stepper motor. The motion control card has I / O port input and output functions and can send signals to solid-state relays to control the on and off of the solid-state relays.

[0031] Meat sample 9 is the meat that is commonly consumed and is to be tested. When placing it, the surface should be as flat as possible and perpendicular to the optical axis of the imaging lens to avoid defocusing when taking pictures.

[0032] The sample stage 10 is a three-dimensional moving frame used to adjust the height of the sample surface and change the area of ​​the captured image in the horizontal direction. The vertical movement is not less than 5 cm and the horizontal movement is not less than 10 cm.

[0033] A structure for a polarization hyperspectral image acquisition device for meat quality, the workflow of which is as follows: Figure 4 As shown.

[0034] 1. Place the meat sample, ensuring the surface is as level and flat as possible, in preparation for the experiment;

[0035] 2. The computer activates the solid-state relay via the PCI motion control card, turns on the lighting source, and resets the monochromator's output wavelength;

[0036] 3. The computer resets the turntable in the polarization and detection modules via the PCI motion control card;

[0037] 4. The computer rotates the polarizer in the polarization and analysis modules to the s-polarization / s-polarization position.

[0038] p-polarization / p-polarization, s-polarization / p-polarization, p-polarization / s-polarization position, each polarization state configuration continuously changes the output wavelength of the monochromator according to the set spectral resolution, and the image acquired by the camera is automatically acquired in real time.

[0039] 5. The computer stores the acquired polarization hyperspectral images on the hard drive to construct a dataset.

[0040] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features.

Claims

1. A device for acquiring polarization hyperspectral images of meat quality, characterized in that: The system includes an illumination source (1), a monochromator (2), a polarization module (3), a camera (4), an imaging lens (5), a polarization analyzer (6), a control module (7), a computer (8), a meat sample (9), and a sample stage (10). The meat sample (9) is placed on the sample stage (10). The illumination source (1), monochromator (2), and polarization module (3) are arranged in sequence, and the optical axis of the meat sample (9) is perpendicular to that of the imaging lens (5). The light beam emitted by the illumination source (1) passes through the monochromator (2) and the polarization module (3) to form a linearly polarized monochromatic light beam that illuminates the meat sample (9). After being reflected by the meat sample (9), the light beam passes through the polarization analyzer (6) and the imaging lens (5) from bottom to top and then reaches the camera (4). The polarization analyzer (6) analyzes the reflected light, which carries the sample information. The image is then acquired by the camera (4) and the imaging lens (5) and becomes an image. The computer (8) obtains the image captured by the camera (4) through a gigabit network interface. The control module (7) is connected to the computer (8).

2. The device for acquiring polarization hyperspectral images of meat quality according to claim 1, characterized in that: The lighting source (1) is a halogen lamp.

3. The device for acquiring polarization hyperspectral images of meat quality according to claim 1, characterized in that: The monochromator (2) uses a grating for light dispersion and is connected to the computer (8) via RS232 protocol.

4. The device for acquiring polarization hyperspectral images of meat quality according to claim 1, characterized in that: The polarization module (3) and the polarization analyzer (6) have the same structure. The polarization module (3) consists of a polarizer (31) and an electric turntable (32). Light is emitted through the polarizer (31) and the electric turntable (32). The rotation axis of the electric turntable (32) is hollow, and light passes through it. The electric turntable (32) is set with an absolute zero position. The polarizer (31) is composed of dichroic material. The optical axis of the polarizer is approximately coincident with the mechanical axis of the turntable, and the direction of the emitted light can be determined to illuminate the sample.

5. The device for acquiring polarization hyperspectral images of meat quality according to claim 1, characterized in that: The camera (4) uses a CMOS monochrome industrial camera and is connected to the computer (8) via a gigabit network.

6. The device for acquiring polarization hyperspectral images of meat quality according to claim 1, characterized in that: The control module (7) includes the control of the electric turntable stepper motor in the power supply, the polarization module, the polarization detection module, and the control of the on / off of the lighting source.

7. The device for acquiring polarization hyperspectral images of meat quality according to claim 1, characterized in that: The sample stage (10) is a three-dimensional moving frame, with a vertical movement of no less than 5 cm and a horizontal movement of no less than 10 cm.

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