Fresh meat freshness monitoring device and method

Abstract

The invention relates to the technical field of fresh meat freshness detection, in particular to a fresh meat freshness monitoring device and method. The conductivity testing module is used for testing the conductivity of the fresh meat and comprises a sampler for sampling the fresh meat to obtain detected meat strips and testing the conductivity of the detected meat strips by connecting the detected meat strips into a conductive loop; the image acquisition module is used for respectively acquiring surface images of fresh meat and detected meat strips and comprises a meat strip image acquisition unit for acquiring the surface images of the detected meat strips and a fresh meat image acquisition unit for acquiring the surface images of the fresh meat; and the freshness analysis module is used for determining the sampling rate of the sampler according to the maximum displacement of the fresh meat in unit time, and judging whether the fresh meat is fresh or not according to the average chromaticity of the surface image of the detected meat strip and the conductivity of the fresh meat. According to the invention, the detection precision and the accuracy of the detection result are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh meat freshness detection, and in particular to a fresh meat freshness monitoring device and method. Background Art

[0002] In the prior art, the commonly used physical and chemical indicators for meat freshness detection include TVB-N content, pH value, conductivity, color, tenderness, etc. Among them, the principle of testing the freshness of meat by conductivity is that the freshness of meat decreases, resulting in the decomposition of certain components. Since the decomposition products contain a large amount of conductive substances (such as Na, Cl, K ions), their freshness can be inferred based on their conductivity values. Commonly used techniques for meat freshness detection also include physical indicator detection, such as meat color determination, elasticity and hardness testing, and microbial indicator detection, such as total colony count determination and specific microbial detection. However, these traditional detection methods have limitations such as low detection accuracy or long time consumption, and cannot timely and accurately reflect freshness information. Rapid and accurate monitoring methods have become a development trend for meat freshness detection.

[0003] Chinese Patent Publication No.: CN109856196B discloses a chilled meat freshness monitoring device and method, the chilled meat freshness monitoring device comprises an interdigital electrode hydrogen sulfide sensor, a paper battery and an electrochromic device;

[0004] The interdigital electrode hydrogen sulfide sensor is connected to the fresh meat package, and the two ends of the paper battery are respectively connected to the interdigital electrode hydrogen sulfide sensor and the electrochromic device to form an equivalent circuit;

[0005] The interdigital electrode hydrogen sulfide sensor is used to react with hydrogen sulfide and change the impedance value, and when the impedance value of the interdigital electrode hydrogen sulfide sensor is a first preset threshold value, the equivalent circuit is turned on; wherein the freshness of the chilled meat corresponding to the impedance value of the interdigital electrode hydrogen sulfide sensor being the first preset threshold value is obtained according to a pre-established model of freshness of chilled meat-impedance value of the interdigital electrode hydrogen sulfide sensor;

[0006] The electrochromic device is used to change color when the equivalent circuit is turned on;

[0007] The monitoring method of the chilled meat freshness monitoring device comprises:

[0008] S1, connecting the interdigital electrode hydrogen sulfide sensor to the fresh meat package; wherein the interdigital electrode hydrogen sulfide sensor is connected to the paper battery and the electrochromic device respectively to form an equivalent circuit;

[0009] S2, if the electrochromic device changes color, it is determined that the equivalent circuit is turned on, and the impedance value of the interdigital electrode hydrogen sulfide sensor is a first preset threshold value;

[0010] S3, obtaining the freshness of the chilled meat according to the impedance value of the interdigital electrode hydrogen sulfide sensor and a pre-established chilled meat freshness-interdigital electrode hydrogen sulfide sensor impedance value model;

[0011] In S3, the process of establishing the chilled meat freshness-interdigital electrode hydrogen sulfide sensor impedance value model includes:

[0012] S31, collecting the time series corresponding to the storage and transportation environment temperature, hydrogen sulfide gas concentration and volatile basic nitrogen (TVB-N) content in the fresh meat package, and establishing a hydrogen sulfide concentration-chilled meat freshness model according to the corresponding relationship between the volatile basic nitrogen (TVB-N) content and the freshness of the chilled meat;

[0013] S32, placing the interdigital electrode hydrogen sulfide sensor into fresh meat packages with different hydrogen sulfide concentrations, and collecting impedance values ​​of the interdigital electrode hydrogen sulfide sensor corresponding to the different hydrogen sulfide concentrations;

[0014] S33, according to the impedance values ​​of the interdigital electrode hydrogen sulfide sensor corresponding to different hydrogen sulfide concentrations and the hydrogen sulfide concentration-chilled meat freshness model, a chilled meat freshness-interdigital electrode hydrogen sulfide sensor impedance value model is established. It can be seen that the chilled meat freshness monitoring device and method have the problems of reduced detection accuracy due to the different volumes of the inspected meat and reduced accuracy of the detection result due to the influence of the water-injected meat on the meat quality environment of the inspected meat. Summary of the invention

[0015] To this end, the present invention provides a fresh meat freshness monitoring device and method to overcome the problems in the prior art of reduced detection accuracy due to the different volumes of the inspected meat and reduced accuracy of the detection results due to the influence of water-injected meat on the meat quality environment of the inspected meat.

[0016] To achieve the above object, the present invention provides a fresh meat freshness monitoring device, comprising:

[0017] Test platform;

[0018] A conductivity testing module connected to the testing platform for testing the conductivity of fresh meat, comprising a sampler for sampling fresh meat to obtain a tested meat strip and a conductivity testing assembly connected to the sampler for testing the conductivity of the tested meat strip by connecting the tested meat strip to a conductive loop;

[0019] An image acquisition module, which is arranged above the test platform and is used to respectively acquire surface images of fresh meat and the inspected meat strip, including a meat strip image acquisition unit arranged above the sampler and used to acquire surface images of the inspected meat strip, and a fresh meat image acquisition unit arranged on a side of the test platform away from the sampler and used to acquire surface images of fresh meat;

[0020] The freshness analysis module is connected to the conductivity test module and the image acquisition module respectively, and is used to determine the sampling rate of the sampler according to the maximum displacement of the fresh meat in unit time, and to judge whether the fresh meat is fresh according to the average chromaticity of the surface color of the tested meat strip and the conductivity of the fresh meat.

[0021] Furthermore, the three-dimensional structure of the sampler is a hollow semi-cylinder with a semicircular bottom.

[0022] Furthermore, the conductivity test assembly comprises:

[0023] An electrode sheet group, which is arranged on the inner wall of the sampler and is used to pass current into the inspected meat strip;

[0024] An ammeter is connected to the electrode sheet group and is used to detect the path current passing through the inspected meat strip.

[0025] Furthermore, the test platform is also provided with a mechanical arm connected to the sampler for adjusting the sampling rate and height of the sampler.

[0026] Furthermore, the freshness analysis module is respectively connected to the fresh meat image acquisition unit and the robotic arm, so as to obtain the surface image of the fresh meat when the fresh meat is above the test platform, perform edge detection on the surface image of the fresh meat, and calculate the maximum displacement of several points on the edge of the surface image of the fresh meat per unit time. If the maximum displacement is greater than or equal to a preset maximum displacement, it is determined that the sampling stability does not meet the requirements, and the sampling rate of the sampler is reduced.

[0027] Furthermore, the reduction amplitude of the sampling rate of the sampler is positively correlated with the maximum displacement.

[0028] Furthermore, the freshness analysis module is connected to the conductivity testing module to obtain the current in the conductive circuit after the inspected meat strip is connected to the conductivity testing component, and calculate the conductivity of the inspected meat strip. If the conductivity is greater than or equal to a preset conductivity, it is determined that the conductivity of the inspected meat strip does not meet the requirements.

[0029] The conductivity of the inspected meat strip is the ratio of the current in the conductive loop to the cross-sectional area of ​​the inspected meat strip parallel to the bottom surface of the sampler.

[0030] Furthermore, the freshness analysis module is connected to the meat strip image acquisition unit to obtain the average chromaticity of the surface color of the inspected meat strip at the end of the detection cycle. If the average chromaticity exceeds the chromaticity threshold, it is determined that the surface freshness of the inspected meat strip does not meet the requirements.

[0031] Furthermore, the freshness analysis module is connected to the conductivity testing module and the meat strip image acquisition unit respectively, so as to determine that the fresh meat is not fresh meat when the conductivity of the inspected meat strip does not meet the requirements and the surface freshness does not meet the requirements.

[0032] The present invention also provides a freshness monitoring method of a fresh meat freshness monitoring device, comprising:

[0033] Obtaining a surface image of fresh meat, and calculating the maximum displacement of several points on the edge of the fresh meat surface in unit time;

[0034] adjusting a sampling rate of a sampler according to the maximum displacement;

[0035] Using a sampler to collect the inspected meat strips from the fresh meat at the sampling rate;

[0036] Obtaining the path current after the conductivity test component is connected to the tested meat strip;

[0037] Calculating the conductivity of the inspected meat strip according to the current;

[0038] Obtaining the average chromaticity of the surface color of the inspected meat strip;

[0039] Whether the fresh meat is fresh is determined based on the conductivity of the inspected meat strip and the average chromaticity of the surface color.

[0040] Compared with the prior art, the beneficial effects of the present invention are that the system of the present invention detects the freshness of fresh meat by setting a test platform, a conductivity test module, an image acquisition module and a freshness analysis module. Since the volume of fresh meat is inconsistent, by sampling and testing the fresh meat with equal cross-sections and lengths, rapid automatic detection is convenient, the consistency of the detection object is improved, and the freshness of the whole fresh meat can be accurately reflected, thereby achieving improved detection accuracy; by detecting the surface image of the fresh meat, after the fresh meat reaches the conveyor belt, due to the different vertical heights of the fresh meat, the shape of the fresh meat with high vertical height is unstable, resulting in uneven sampling of the inspected meat strips by the sampler, and by determining the sampling rate of the sampler, the uniformity of fresh meat sampling is improved; by detecting the surface image of the inspected meat strip, the freshness is further determined according to the surface image, and the fresh meat is misjudged as not fresh meat due to the increase in conductivity caused by water injection. By detecting the surface image of the inspected meat strip, the influence of the water-injected meat on the accuracy of the detection result is reduced, thereby achieving improved detection accuracy and improved accuracy of the detection result.

[0041] Furthermore, the system of the present invention is equipped with a conductivity testing component, and the electrode sheet and ammeter in the conductivity testing component can accurately measure the current in the conductive circuit, thereby accurately calculating the conductivity of the inspected meat strips, providing accurate data for freshness analysis and realizing rapid detection, thereby improving detection efficiency.

[0042] Furthermore, the system of the present invention sets a preset maximum displacement and a robotic arm, and because the different thicknesses of the fresh meat lead to an unstable shape on the test platform and thus a decrease in detection stability, the uniformity and stability of the inspected meat strips during the sampling process are improved by precise control of the sampling rate. When the fresh meat reaches the top of the test platform, the robotic arm can adjust the sampling rate of the sampler in real time according to the maximum displacement of the fresh meat, thereby reducing the problem of uneven sampling caused by the unstable shape of the fresh meat and achieving improved accuracy of the detection results.

[0043] Furthermore, the system of the present invention sets a preset conductivity. When it is detected that the conductivity of the inspected meat strip exceeds the preset value, the system determines that its conductivity does not meet the requirement, thereby effectively distinguishing stale fresh meat in which the conductivity is abnormally increased due to the production of conductive substances in fresh meat, thereby improving the detection accuracy.

[0044] Furthermore, the system of the present invention sets a chromaticity threshold. Since the difference in surface color is related to the freshness of the meat, by comparing the difference between the surface color and the chromaticity threshold, the system can more accurately judge the freshness of the meat. When the surface color of the inspected meat strip exceeds the preset threshold, the system will determine that the freshness of the meat strip does not meet the requirements, thereby improving the detection accuracy.

[0045] Furthermore, the system of the present invention detects conductivity and collects surface images of the inspected meat strips. Since the detection accuracy of the conductive test module is affected by the increase in water in the water-injected meat, the conductivity detection result is increased. The freshness of the inspected meat strips is comprehensively judged in combination with the surface image, thereby improving the accuracy of the detection results. During the detection process, if the conductivity of the inspected meat strips is abnormally high, but the surface color does not exceed the threshold, the system can accurately determine that the inspected meat strips are suspected of being water-injected, thereby avoiding the problem of misjudgment caused by water injection, improving the detection accuracy, and further improving the anti-interference ability of the freshness analysis module and the accuracy of the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a schematic diagram of the overall structure of a device for monitoring the freshness of fresh meat according to an embodiment of the present invention;

[0047] Figure 2 This is a schematic diagram of the overall structure of the fresh meat freshness monitoring device according to an embodiment of the present invention from another angle;

[0048] Figure 3 This is a schematic diagram of the structure of a sampler and a conductivity test assembly of a fresh meat freshness monitoring device according to an embodiment of the present invention;

[0049] Figure 4 This is an overall flow chart of the fresh meat freshness monitoring method according to an embodiment of the present invention;

[0050] Explanation of the accompanying drawings: 1-test platform, 2-conveyor belt, 3-meat strip image acquisition unit, 4-mechanical arm, 5-ammeter, 6-sampler, 7-fresh meat, 8-fresh meat image acquisition unit, 9-positive electrode sheet, 10-negative electrode sheet. DETAILED DESCRIPTION

[0051] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0052] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0053] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0054] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] See also Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, they are respectively a schematic diagram of the overall structure of the fresh meat freshness monitoring device and method according to an embodiment of the present invention, a schematic diagram of the overall structure from another angle, a schematic diagram of the structure of the sampler and the conductivity test component, and an overall flow chart. A fresh meat freshness monitoring device according to the present invention comprises:

[0056] Test platform 1;

[0057] A conductivity testing module, which is connected to the testing platform 1 and is used to test the conductivity of the fresh meat 7, comprising a sampler 6 for sampling the fresh meat 7 to obtain a tested meat strip and a conductivity testing assembly connected to the sampler 6 and connected to the tested meat strip to a conductive circuit to test the conductivity of the tested meat strip;

[0058] An image acquisition module, which is arranged above the test platform 1 and is used to respectively acquire surface images of the fresh meat 7 and the inspected meat strip, including a meat strip image acquisition unit 3 arranged above the sampler 6 and used to acquire the surface image of the inspected meat strip, and a fresh meat image acquisition unit 8 arranged on a side of the test platform 1 away from the sampler 6 and used to acquire the surface image of the fresh meat 7;

[0059] The freshness analysis module is connected to the conductivity test module and the image acquisition module respectively, and is used to determine the sampling rate of the sampler 6 according to the maximum displacement of the fresh meat 7 per unit time, and to determine whether the fresh meat 7 is fresh according to the average chromaticity of the surface color of the tested meat strip and the conductivity of the fresh meat 7.

[0060] In practice, the system of the present invention is provided with a test platform 1, a conductivity test module, an image acquisition module and a freshness analysis module, and samples the fresh meat 7 to detect its freshness. Since the volume of the fresh meat 7 is inconsistent, the fresh meat 7 is sampled and tested with equal cross-sections and lengths, so as to facilitate rapid automatic testing, improve the consistency of the test object, and accurately reflect the freshness of the whole fresh meat 7, thereby achieving improved detection accuracy. By detecting the surface image of the fresh meat 7, after the fresh meat 7 reaches the conveyor belt 2, the fresh meat 7 with high vertical height has different vertical heights and the shape is unstable, resulting in uneven sampled meat strips sampled by the sampler 6. By determining the sampling rate of the sampler 6, the uniformity of the sampling of the fresh meat 7 is improved. By detecting the surface image of the tested meat strip, the freshness is further determined according to the surface image. Since the conductivity of the fresh meat 7 increases due to water injection, it is misjudged as not fresh meat 7. By detecting the surface image of the tested meat strip, the influence of the water-injected meat on the accuracy of the test result is reduced, thereby achieving improved detection accuracy and improved accuracy of the test result.

[0061] Specifically, the three-dimensional structure of the sampler 6 is a hollow semi-cylinder with a semicircular bottom.

[0062] Specifically, the material of the sampler 6 is an insulating material, and a preferred embodiment of the material of the sampler 6 is ceramic.

[0063] Specifically, the preferred embodiment of the size of the sampler 6 is that the semicircular diameter of the bottom surface of the sampler 6 is 0.6 cm and the length of the sampler 6 is 20 cm. In implementation, those skilled in the art can change the size and material of the sampler 6 as long as the semicircular diameter of the bottom surface of the sampler 6 is kept much smaller than the length of the sampler 6.

[0064] Specifically, the conductivity test assembly includes:

[0065] An electrode sheet group, which is arranged on the inner wall of the sampler 6 and is used to pass current into the inspected meat strip;

[0066] An ammeter 5 is connected to the electrode sheet group and is used to detect the path current passing through the inspected meat strip.

[0067] Specifically, the electrode sheet group includes a positive electrode sheet 9 arranged inside the sampler 6 on a side close to the robot arm 4 and a negative electrode sheet 10 arranged on an inner wall of the sampler 6 on a side away from the robot arm 4 .

[0068] In practice, the system of the present invention sets up a conductivity testing component, and the electrode sheet and ammeter 5 in the conductivity testing component can accurately measure the current in the conductive circuit, thereby accurately calculating the conductivity of the inspected meat strips, providing accurate data for freshness analysis and realizing rapid detection, thereby improving detection efficiency.

[0069] Specifically, the test platform is also provided with a mechanical arm 4 connected to the sampler 6 for adjusting the sampling rate of the sampler 6 and adjusting the height of the sampler 6 .

[0070] Specifically, a conveyor belt 2 for conveying the fresh meat 7 to the testing platform 1 is also provided above the testing platform 1 .

[0071] Specifically, the freshness analysis module is respectively connected to the fresh meat image acquisition unit 8 and the robotic arm 4, so as to obtain the surface image of the fresh meat 7 when the fresh meat 7 is above the test platform 1, and perform edge detection on the surface image of the fresh meat 7, and calculate the maximum displacement of several points on the edge of the surface image of the fresh meat 7 per unit time. If the maximum displacement is greater than or equal to the preset maximum displacement, it is determined that the sampling stability does not meet the requirements, and the sampling rate of the sampler 6 is reduced.

[0072] Specifically, the sampling rate of the sampler 6 is reduced from the standard sampling rate.

[0073] Specifically, the reduction amplitude of the sampling rate of the sampler 6 is positively correlated with the maximum displacement.

[0074] Specifically, the fresh meat image acquisition unit 8 can be a CMOS high-speed camera, a CCD high-speed camera, or a streak camera, wherein a preferred embodiment of the fresh meat image acquisition unit 8 is a streak camera.

[0075] Specifically, the method for calculating the maximum displacement of fresh meat 7 in the surface image of fresh meat 7 within unit time is that the fresh meat image acquisition unit 8 acquires continuous surface images of fresh meat 7, uses edge detection to segment the meat from the background, and uses the inter-frame difference method to detect the position changes of several points on the left and right edges of the surface image of fresh meat 7, and calculates the maximum displacement based on the detected position changes of fresh meat 7 within unit time.

[0076] Specifically, the maximum displacement is the maximum straight line length between the midpoint of the fresh meat 7 at the start time of the unit time and several points on the left and right edges of the surface image of the fresh meat 7 at the end time of the unit time.

[0077] Specifically, when calculating the maximum displacement of the fresh meat 7 in the surface image of the fresh meat 7 within a unit time, the unit time is 0.4 s.

[0078] Specifically, the general value range of the preset maximum displacement is [7mm, 8mm].

[0079] Preferably, the preferred embodiment of the preset maximum displacement is 8 mm.

[0080] Specifically, the setting of the standard sampling rate can be changed according to the size of the robot arm 4 and the size of the fresh meat 7. The preferred embodiment of the standard sampling rate is 0.1 m / s.

[0081] During implementation, when the difference between the maximum displacement of fresh meat 7 within unit time and the preset maximum displacement is within 1 mm, the sampling rate is reduced by 0.01 m / s relative to the standard sampling rate; when the difference between the maximum displacement of fresh meat 7 within unit time and the preset maximum displacement exceeds 1 mm, the sampling rate is reduced by 0.01 m / s relative to the standard sampling rate for every 0.5 mm exceeding the maximum displacement. For example, the maximum displacement of fresh meat 7 within unit time is 10 mm, and the sampling rate is reduced to 0.1 m / s-0.01 m / s-0.01 m / s×2=0.07 m / s relative to the standard sampling rate.

[0082] In implementation, the system of the present invention sets a preset maximum displacement and a robotic arm 4. Due to the unstable shape of the fresh meat 7 on the test platform 1 caused by the different thicknesses of the fresh meat 7, which leads to a decrease in detection stability, the uniformity and stability of the inspected meat strips during the sampling process are improved by precise control of the sampling rate. When the fresh meat 7 reaches the top of the test platform 1, the robotic arm 4 can adjust the sampling rate of the sampler 6 in real time according to the maximum displacement of the fresh meat 7, thereby reducing the problem of uneven sampling caused by the unstable shape of the fresh meat 7 and improving the accuracy of the detection results.

[0083] Specifically, the freshness analysis module is connected to the conductivity testing module to obtain the current in the conductive circuit after the inspected meat strip is connected to the conductivity testing component, and calculate the conductivity of the inspected meat strip. If the conductivity is greater than or equal to the preset conductivity, it is determined that the conductivity of the inspected meat strip does not meet the requirements;

[0084] The conductivity of the inspected meat strip is the ratio of the current in the conductive loop to the cross-sectional area of ​​the inspected meat strip parallel to the bottom surface of the sampler 6 .

[0085] Specifically, the general range of the preset conductivity is [0.5×10 3 μΩ -1 , 0.7×10 3 μΩ -1 ].

[0086] Preferably, the preferred embodiment of the preset conductivity is 0.6×10 3 μΩ -1 .

[0087] In practice, the system of the present invention sets a preset conductivity. When it detects that the conductivity of the inspected meat strip exceeds the preset value, the system determines that its conductivity does not meet the requirement, thereby effectively distinguishing the stale fresh meat 7 that produces conductive substances resulting in abnormally high conductivity, thereby achieving improved detection accuracy.

[0088] Specifically, the freshness analysis module is connected to the meat strip image acquisition unit 3 to obtain the average chromaticity of the surface color of the inspected meat strip at the end of the detection cycle. If the average chromaticity exceeds the chromaticity threshold, it is determined that the surface freshness of the inspected meat strip does not meet the requirements.

[0089] Specifically, the meat strip image acquisition unit 3 can be a color measurement camera, a spectral imaging camera, or a line scan camera, wherein a preferred embodiment of the meat strip image acquisition unit 3 is a line scan camera.

[0090] Specifically, the surface color of the inspected meat strips at the end of a unit time is acquired through a CIELab color space measurement system.

[0091] Optionally, the optional range of the L value of the chromaticity threshold is [38, 58].

[0092] Preferably, the preferred embodiment of the chroma threshold is [40, 55].

[0093] Specifically, when the average chromaticity of the surface color of the inspected meat strip at the end of the detection period exceeds the L value range of the chromaticity threshold, it is determined that the surface freshness of the inspected meat strip does not meet the requirements.

[0094] In practice, the system of the present invention sets a chromaticity threshold. Since the difference in surface color is related to the freshness of meat, by comparing the difference between the surface color and the chromaticity threshold, the system can more accurately judge the freshness of meat. When the surface color of the inspected meat strip exceeds the preset threshold, the system will determine that the freshness of the meat strip does not meet the requirements, thereby improving the detection accuracy.

[0095] Specifically, the freshness analysis module is connected to the conductivity testing module and the meat strip image acquisition unit 3 respectively, so as to determine that the fresh meat 7 is not fresh fresh meat 7 when the conductivity of the inspected meat strip does not meet the requirements and the surface freshness does not meet the requirements.

[0096] In practice, the system of the present invention detects conductivity and collects surface images of the inspected meat strips. Since the increase in water in the water-injected meat affects the detection accuracy of the conductive test module, the conductivity detection result increases. The freshness of the inspected meat strips is comprehensively judged in combination with the surface image, thereby improving the accuracy of the detection results. During the detection process, if the conductivity of the inspected meat strips is abnormally high, but the surface color does not exceed the threshold, the system can accurately determine that the inspected meat strips are suspected of being water-injected, thereby avoiding the problem of misjudgment caused by water injection, improving the detection accuracy, and further improving the anti-interference ability of the freshness analysis module and the accuracy of the detection results.

[0097] The present invention provides a freshness monitoring method of a fresh meat freshness monitoring device, comprising:

[0098] Acquire a surface image of the fresh meat 7, and calculate the maximum displacement of several points on the edge of the surface of the fresh meat 7 in a unit time;

[0099] adjusting the sampling rate of the sampler 6 according to the maximum displacement;

[0100] Using the sampler 6 to collect the inspected meat strips from the fresh meat 7 at the sampling rate;

[0101] Obtaining the path current after the conductivity test component is connected to the tested meat strip;

[0102] Calculating the conductivity of the inspected meat strip according to the current;

[0103] Obtaining the average chromaticity of the surface color of the inspected meat strip;

[0104] Whether the fresh meat 7 is fresh is determined based on the conductivity of the inspected meat strip and the average chromaticity of the surface color.

[0105] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A fresh meat freshness monitoring device, characterized in that: include: Test platform; A conductivity testing module connected to the testing platform for testing the conductivity of fresh meat, comprising a sampler for sampling fresh meat to obtain a tested meat strip and a conductivity testing assembly connected to the sampler for testing the conductivity of the tested meat strip by connecting the tested meat strip to a conductive loop; An image acquisition module, which is arranged above the test platform and is used to respectively acquire surface images of fresh meat and the inspected meat strip, including a meat strip image acquisition unit arranged above the sampler and used to acquire surface images of the inspected meat strip, and a fresh meat image acquisition unit arranged on a side of the test platform away from the sampler and used to acquire surface images of fresh meat; The freshness analysis module is connected to the conductivity test module and the image acquisition module respectively, and is used to determine the sampling rate of the sampler according to the maximum displacement of the fresh meat in unit time, and to judge whether the fresh meat is fresh according to the average chromaticity of the surface color of the tested meat strip and the conductivity of the fresh meat.

2. The fresh meat freshness monitoring device according to claim 1, characterized in that: The three-dimensional structure of the sampler is a hollow semi-cylinder with a semicircular bottom.

3. The fresh meat freshness monitoring device according to claim 2, characterized in that: The conductivity test assembly comprises: An electrode sheet group, which is arranged on the inner wall of the sampler and is used to pass current into the inspected meat strip; An ammeter is connected to the electrode sheet group and is used to detect the path current passing through the inspected meat strip.

4. The fresh meat freshness monitoring device according to claim 3, characterized in that: The test platform is also provided with a mechanical arm connected to the sampler for adjusting the sampling rate and height of the sampler.

5. The fresh meat freshness monitoring device according to claim 4, characterized in that: The freshness analysis module is connected to the fresh meat image acquisition unit and the robotic arm, respectively, to obtain the surface image of the fresh meat when the fresh meat is above the test platform, perform edge detection on the surface image of the fresh meat, and calculate the maximum displacement of several points on the edge of the surface image of the fresh meat per unit time. If the maximum displacement is greater than or equal to a preset maximum displacement, it is determined that the sampling stability does not meet the requirements, and the sampling rate of the sampler is reduced.

6. The fresh meat freshness monitoring device according to claim 5, characterized in that: The reduction amplitude of the sampling rate of the sampler is positively correlated with the maximum displacement.

7. The fresh meat freshness monitoring device according to claim 6, characterized in that: The freshness analysis module is connected to the conductivity testing module to obtain the current in the conductive circuit after the inspected meat strip is connected to the conductivity testing assembly, and calculate the conductivity of the inspected meat strip. If the conductivity is greater than or equal to the preset conductivity, it is determined that the conductivity of the inspected meat strip does not meet the requirements; The conductivity of the inspected meat strip is the ratio of the current in the conductive loop to the cross-sectional area of ​​the inspected meat strip parallel to the bottom surface of the sampler.

8. The fresh meat freshness monitoring device according to claim 7, characterized in that: The freshness analysis module is connected to the meat strip image acquisition unit to obtain the average chromaticity of the surface color of the inspected meat strip at the end of the detection cycle. If the average chromaticity exceeds the chromaticity threshold, it is determined that the surface freshness of the inspected meat strip does not meet the requirements.

9. The fresh meat freshness monitoring device according to claim 8, characterized in that: The freshness analysis module is connected to the conductivity testing module and the meat strip image acquisition unit respectively, and is used to determine that the fresh meat is not fresh meat when the conductivity of the inspected meat strip does not meet the requirements and the surface freshness does not meet the requirements.

10. A freshness monitoring method applied to the fresh meat freshness monitoring device according to claims 1-9, characterized in that: include: Obtaining a surface image of fresh meat, and calculating the maximum displacement of several points on the edge of the fresh meat surface in unit time; adjusting a sampling rate of a sampler according to the maximum displacement; Using a sampler to collect the inspected meat strips from the fresh meat at the sampling rate; Obtaining the path current after the conductivity test component is connected to the tested meat strip; Calculating the conductivity of the inspected meat strip according to the current; Obtaining the average chromaticity of the surface color of the inspected meat strip; Whether the fresh meat is fresh is determined based on the conductivity of the inspected meat strip and the average chromaticity of the surface color.

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