Infrared thermal imaging detection system and method for evaluating key attributes of traditional Chinese medicinal materials

Abstract

The invention discloses an infrared thermal imaging detection system and method for evaluating key attributes of traditional Chinese medicinal materials. The system is composed of a signal transceiver, an infrared thermal imager, a high-power halogen lamp and other instruments. The method has the technical characteristics of non-contact, rapid and visual detection. The method is used for solving the problems of relatively high subjectivity, low detection efficiency and the like of a traditional Chinese medicinal material detection method. By applying the system and the method, worm damage, abnormal water content and mildew conditions in the traditional Chinese medicinal materials can be synchronously detected, rapid, non-contact and lossless high-quality detection is really achieved, dependence on artificial experience and physical damage and chemical pollution to the traditional Chinese medicinal materials are avoided, and further development of the traditional Chinese medicine field is expected to be promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of traditional Chinese medicine detection, and in particular to an infrared thermal imaging detection system and method for evaluating key properties of traditional Chinese medicine. Background Art

[0002] Traditional Chinese Medicine (TCM) is a treasure of ancient Chinese science. As the material foundation and core element of the TCM system, the quality of TCM materials is directly related to clinical efficacy and medication safety. Among the many factors that affect the quality of TCM materials, abnormal moisture content, insect infestation, and mildew are particularly common. Abnormal moisture content not only directly reduces the quality of the medicinal materials, but also makes them more susceptible to insect infestation and mildew. Both of these factors will further erode the medicinal materials' active ingredients, gradually accumulating toxins and posing a potential threat to the user's health. Therefore, accurately detecting moisture content, insect infestation, and mildew in TCM materials is of great significance for safeguarding their quality and ensuring medication safety.

[0003] With the acceleration of the modernization and internationalization of the traditional Chinese medicine industry, the market has increasingly stringent requirements for the consistency and standardization of the quality of Chinese medicinal materials. Traditional detection methods such as appearance inspection, touch, and nose smell that rely on manual experience are highly subjective, have low detection efficiency, and serious misjudgment phenomena, making it difficult to meet the needs of large-scale production and high-precision detection. New detection methods such as microscopic detection and physical and chemical detection also face the problem of low detection efficiency, and some chemical reagent residues will cause secondary pollution to Chinese medicinal materials, thereby threatening the health of operators and users. Therefore, the traditional Chinese medicine industry urgently needs a set of non-destructive testing technologies suitable for the detection of key indicators such as the moisture content, insect infestation, and mildew degree of Chinese medicinal materials, so as to fill the gaps in the existing detection technologies in terms of detection efficiency, reliability, and convenience, and promote the high-quality development of the Chinese medicinal materials industry. The technology described in this patent is a solution to this problem.

[0004] Active infrared thermal imaging testing technology uses thermal excitation sources such as lasers and eddy currents to heat the surface or interior of a material. Defects in the material interfere with heat diffusion, and the thermal disturbance is reflected on the surface. Infrared thermal imaging collects and analyzes surface temperature data, enabling defect detection. As an in-situ, non-destructive testing technology, active infrared thermal imaging has been widely used in industry due to its high efficiency, non-contact nature, and visualization. It also shows great potential in the testing of traditional Chinese medicines (TCMs). The density, thermal conductivity, and specific heat capacity of TCMs are closely related to their water content. Mold on the surface of TCMs can alter local light absorption, while insect infestation within the materials directly interferes with the diffusion of heat waves. When TCMs are heated using an external light source, these differences in thermophysical properties are reflected in the temperature data collected by the infrared thermal imaging camera. This provides a reliable basis for high-quality assessment of key TCM properties and is expected to promote innovative developments in TCM testing technology. Summary of the Invention

[0005] In order to solve the problem that existing Chinese medicinal materials detection methods generally rely on manual experience, resulting in excessive subjectivity, low detection efficiency and inaccurate detection results, the present invention proposes an infrared thermal imaging detection system and method for evaluating key properties of Chinese medicinal materials.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The infrared thermal imaging detection system for evaluating the key properties of traditional Chinese medicine (TCM) materials consists of a computer equipped with control and post-processing software, a signal transceiver, a high-power halogen lamp, an infrared thermal imager, an air-cooling module, and a carrier with low light absorption. The computer issues control instructions, causing the connected signal transceiver to generate two synchronized drive signals: one for driving the high-power halogen lamp to heat the TCM materials on the carrier, and the other for driving the infrared thermal imager to perform real-time sampling during this process. After the infrared thermal imager completes sampling, the signal transceiver generates an additional drive signal to drive the air-cooling module to supply air, quickly restoring the carrier to room temperature. Simultaneously, the signal transceiver transmits temperature data collected by the infrared thermal imager back to the computer, which then performs post-processing and analysis on the test results to achieve high-quality evaluation of the TCM's key properties.

[0008] As a preferred solution, the power of the halogen lamp described in the present invention should be no less than 200W, and the output power should be adjustable; the resolution of the infrared thermal imager should be 640×512 pixels or higher, the thermal sensitivity (NETD) should be no higher than 50mK, and the full-frame sampling rate should be no less than 50Hz.

[0009] As another preferred solution, the carrier of the present invention is made of a material with low light absorption rate (≤15%), including but not limited to alumina ceramics or white PVC board.

[0010] The infrared thermal imaging detection method for evaluating key properties of Chinese medicinal materials includes the following steps:

[0011] Step S1: Place the sliced ​​Chinese medicinal materials flat on the carrier, ensuring that there is no overlap between the Chinese medicinal materials;

[0012] Step S2: Complete the settings on a computer equipped with control and post-processing software to enable the signal transceiver to generate a low-frequency square wave and a synchronized high-frequency continuous pulse wave driving signal;

[0013] Step S3: A low-frequency square wave signal drives a high-power halogen lamp to emit light, which is irradiated on the carrier and the upper surface of the Chinese medicinal materials. Mildew, abnormal moisture content, and internal insect infestation in the Chinese medicinal materials will affect the diffusion of heat waves, causing thermal disturbances on the upper surface of the Chinese medicinal materials.

[0014] Step S4: During step S3, the high-frequency continuous pulse wave signal drives the infrared thermal imager to continuously collect temperature distribution data on the carrier and the upper surface of the Chinese medicinal material, and transmits the infrared image back to the computer via the signal transceiver;

[0015] Step S5: using a computer to post-process and analyze the test results, thereby identifying mold, abnormal moisture content, and internal insect damage in the Chinese medicinal materials;

[0016] Step S6: After the infrared thermal imager finishes sampling, the signal transceiver generates a third low-frequency square wave signal with a phase lag of a specific time, which is used to drive the air cooling module to supply air so that the carrier can quickly return to room temperature. In this process, the Chinese medicinal materials that have just been tested are recovered and the next group of Chinese medicinal materials are placed flat. After waiting for the carrier to return to room temperature, the test of the next group of Chinese medicinal materials will begin.

[0017] In step S2 and step S4 of the present invention, the high-frequency continuous pulse wave driving signal is a continuous square wave signal with a duty cycle of ≤5%, and the infrared thermal imager captures an image every time a pulse signal is received.

[0018] In step S5 of the present invention, the computer arranges the received infrared images in chronological order to form an infrared image sequence reflecting the temperature evolution of the Chinese medicinal materials and the carrier surface, compresses and extracts features from the sequence using a thermal image sequence reconstruction algorithm, and fits the temperature-time data of each pixel point using a characteristic polynomial to generate a new time-series denoised infrared image sequence.

[0019] In step S4 of the present invention, since the light absorption rate of the carrier is much lower than that of the Chinese medicinal materials to be inspected, the temperature rise on the surface of the Chinese medicinal materials is significantly higher than that of the carrier in the short time (0 to 0.1s) when the high-power halogen lamp emits light. One frame of the infrared image is selected, and it is processed using the threshold segmentation technology. The processing result is binarized to generate a mask, and the mask is applied to the entire time-series denoised infrared image sequence, so that the Chinese medicinal materials can be effectively extracted from the carrier background.

[0020] In step S5 of the present invention, mildew on the surface of the Chinese medicinal material will cause a change in the local light absorption rate. In the short period of time (0 to 0.1 seconds) when the high-power halogen lamp emits light and heats the Chinese medicinal material, the change in light absorption rate at the moldy part will cause an abnormal increase in local temperature. At this time, the temperature disturbance caused by the internal characteristics has not yet been transmitted to the surface of the Chinese medicinal material. The infrared image sequence within this time period is extracted, and the principal component analysis method and histogram equalization method are used to perform feature extraction and contrast enhancement. By analyzing the abnormal temperature (or grayscale) distribution in the processed image, it can be accurately determined whether the surface of the Chinese medicinal material is mildewed.

[0021] In step S5 of the present invention, the moldy Chinese medicinal materials are removed, and the infrared image sequence of the remaining Chinese medicinal materials during the cooling period is processed using the principal component analysis method and the histogram equalization method. Since the internal insect infestation hinders the further diffusion of the heat wave, the temperature abnormality is now reflected on the upper surface of the Chinese medicinal materials. By analyzing the abnormal temperature (or grayscale) distribution in the processing results, it can be accurately determined whether there are insect infestations inside the Chinese medicinal materials.

[0022] In step S5 of the present invention, Chinese medicinal materials that are moldy or insect-infested are removed, and the temperature-time distribution data of the surfaces of the remaining Chinese medicinal materials are extracted (the temperature-time distribution data of multiple points are randomly selected on the surface of a single Chinese medicinal material and averaged). The higher the water content of the Chinese medicinal material, the higher the specific heat capacity. Under the premise of receiving the same amount of heat, the temperature change is lower. After the outer surface of the Chinese medicinal material is heated, the evaporation of water vapor will also take away some heat. Therefore, it is only necessary to record the maximum temperature rise on the upper surface of each Chinese medicinal material. The higher the temperature rise, the lower the water content. Through this method, it is possible to accurately determine whether there is abnormal water content inside the Chinese medicinal material.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention provides an infrared thermal imaging detection system and method for evaluating key properties of traditional Chinese medicines, which can simultaneously detect insect infestations, abnormal water content, and mildew in traditional Chinese medicines. By virtue of the advantages of fast infrared thermal imaging detection and good visualization, the present invention can complete the detection of a large number of traditional Chinese medicines in just a few seconds. The present invention truly achieves non-contact and non-destructive detection, avoiding physical damage and chemical contamination to traditional Chinese medicines. The present invention selects data from different time periods for processing in response to various situations, and uses a variety of advanced data processing algorithms to further improve the reliability and accuracy of the test results. These innovations make the present invention significantly superior to existing technologies in terms of detection efficiency, accuracy, and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the infrared thermal imaging detection system used for evaluating key properties of traditional Chinese medicines according to the present invention.

[0026] Figure 2 (a) is a schematic diagram of a low-frequency square wave signal used to drive a high-power halogen lamp to emit light according to the present invention;

[0027] Figure 2 (b) is a schematic diagram of a high-frequency continuous pulse wave signal used to drive an infrared thermal imager to sample;

[0028] Figure 2 (c) is a schematic diagram of a low-frequency square wave signal with a phase lag of a specific time used to drive the air cooling module to supply air according to the present invention.

[0029] Figure 3This is a schematic diagram of infrared detection results within a short period of time (0 to 0.1 s) when the high-power halogen lamp of the present invention emits light.

[0030] Figure 4 This is a schematic diagram of infrared detection results in the cooling stage after time-series noise reduction, masking, and removal of moldy Chinese medicinal materials as described in the present invention.

[0031] Figure 5 This is a schematic diagram of temperature-time distribution data on the surface of the remaining Chinese medicinal materials after the mildewed and insect-infested Chinese medicinal materials are removed according to the present invention.

[0032] Figure 3 The light absorption rate of the carrier with number 6 is much lower than that of the Chinese medicinal materials to be inspected with number 7. Therefore, in the short time (0 to 0.1s) when the high-power halogen lamp emits light, the temperature rise on the surface of the Chinese medicinal materials is significantly higher than that of the carrier. The threshold segmentation method can be used to easily extract the Chinese medicinal materials to be inspected from the background.

[0033] Figure 3 The surface mildew of the winning number 8 caused a change in the light absorption rate and caused a local abnormal temperature rise on the surface of the Chinese medicinal material at the moment heating began.

[0034] Figure 4 After the Chinese medicinal materials enter the cooling stage, the thermal disturbance caused by internal insect bites pointed to by number 9 is reflected on the upper surface of the Chinese medicinal materials, manifesting as local temperature anomalies; in addition, due to the abnormal water content of the Chinese medicinal materials, the surface temperature of the Chinese medicinal materials pointed to by number 10 is different from that of the Chinese medicinal materials with normal water content.

[0035] Figure 5 In the process, after removing the Chinese medicinal materials that are moldy and insect-infested, the temperature-time data of the upper surface of each Chinese medicinal material is recorded. The higher the temperature rise, the lower the moisture content. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings.

[0037] like Figure 1As shown, the infrared thermal imaging detection system for evaluating the key properties of traditional Chinese medicines includes a computer 1 equipped with control and post-processing software, a signal transceiver 2, a high-power halogen lamp 3, an infrared thermal imager 4, an air-cooling module 5, and a carrier 6 with low light absorption. Computer 1 issues control instructions, causing the connected signal transceiver 2 to generate two synchronous drive signals, one for driving the high-power halogen lamp 3 to emit light to heat the traditional Chinese medicine 7 on the carrier 6, and the other for driving the infrared thermal imager 4 to perform real-time sampling during this process. After the infrared thermal imager 4 completes sampling, the signal transceiver 2 generates an additional drive signal to drive the air-cooling module 5 to supply air, quickly restoring the carrier 6 to room temperature. Simultaneously, the signal transceiver 2 transmits the temperature data collected by the infrared thermal imager 4 back to the computer 1, which then performs post-processing and analysis on the test results to achieve a high-quality evaluation of the key properties of the traditional Chinese medicine 7.

[0038] As a preferred solution, the power of the halogen lamp 3 described in the present invention should be no less than 200W, and the output power should be adjustable; the resolution of the infrared thermal imager 4 should be 640×512 pixels or higher, the thermal sensitivity (NETD) should be no higher than 50mK, and the full-frame sampling rate should be no less than 50Hz.

[0039] As another preferred solution, the carrier 6 of the present invention is made of a material with low light absorption rate (≤15%), including but not limited to alumina ceramics or white PVC board.

[0040] like Figure 1 and Figure 2 As shown in FIG, the detection method of the infrared thermal imaging detection system for evaluating key properties of traditional Chinese medicines specifically includes the following steps:

[0041] Step S1: Place the sliced ​​Chinese medicinal materials 7 flat on the carrier 6, ensuring that there is no overlap between the Chinese medicinal materials 7;

[0042] Step S2: Complete the settings on the computer 1 equipped with control and post-processing software to enable the signal transceiver 2 to generate a low-frequency square wave and a synchronized high-frequency continuous pulse wave driving signal;

[0043] Step S3: A low-frequency square wave signal drives a high-power halogen lamp 3 to emit light, which is irradiated on the upper surface of the carrier 6 and the Chinese medicinal material 7. Mildew 8, internal insect damage 9, and abnormal moisture content 10 in the Chinese medicinal material 7 will affect the diffusion of the heat wave, causing thermal disturbances on the upper surface of the Chinese medicinal material 7;

[0044] Step S4: During step S3, the high-frequency continuous pulse wave signal drives the infrared thermal imager 4 to continuously collect temperature distribution data on the upper surface of the carrier 6 and the Chinese medicinal material 7, and transmits the infrared image back to the computer 1 via the signal transceiver 2;

[0045] Step S5: using the computer 1 to post-process and analyze the test results, thereby identifying mold 8, internal insect damage 9, and abnormal moisture content 10 in the Chinese medicinal materials 7;

[0046] Step S6: After the infrared thermal imager 4 finishes sampling, the signal transceiver 2 generates a third low-frequency square wave signal with a phase lag of a specific time, which is used to drive the air cooling module 5 to supply air, so that the carrier 6 can quickly return to room temperature. In this process, the Chinese medicinal materials 7 that have just been tested are recovered and the next group of Chinese medicinal materials 7 are placed flat. After waiting for the carrier 6 to return to room temperature, the testing of the next group of Chinese medicinal materials 7 is started.

[0047] like Figure 2 As shown in (b), in step S2 and step S4 of the present invention, the high-frequency continuous pulse wave driving signal is a continuous square wave signal with a duty cycle of ≤5%, and the infrared thermal imager 4 captures an image every time a pulse signal is received.

[0048] In step S5 of the present invention, the computer 1 arranges the received infrared images in chronological order to form an infrared image sequence reflecting the surface temperature evolution of the Chinese medicinal material 7 and the carrier 6, compresses and extracts features of the sequence using a thermal image sequence reconstruction algorithm, and fits the temperature-time data of each pixel point through a characteristic polynomial to generate a new time-series denoised infrared image sequence.

[0049] like Figure 3 As shown, in step S4 of the present invention, since the light absorption rate of the carrier 6 is much lower than that of the Chinese medicinal material 7 to be inspected, the temperature rise on the upper surface of the Chinese medicinal material 7 is significantly higher than that of the carrier 6 within a short period of time (0 to 0.1 s) when the high-power halogen lamp 3 emits light. One frame of the infrared image is selected, and the threshold segmentation technology is used to process it. The processing result is binarized to generate a mask, and the mask is applied to the entire time-series denoised infrared image sequence, so that the Chinese medicinal material 7 can be effectively extracted from the background of the carrier 6.

[0050] like Figure 3 As shown, in step S5 of the present invention, the mildew 8 on the surface of the Chinese medicinal material 7 will cause a change in the local light absorption rate. In the short time (0 to 0.1 s) when the high-power halogen lamp 3 emits light and heats the Chinese medicinal material 7, the change in light absorption rate at the mildewed part 8 will cause an abnormal increase in local temperature, while at this time, the temperature disturbance caused by the internal characteristics has not yet been transmitted to the surface of the Chinese medicinal material 7; the infrared image sequence within this time period is extracted, and the principal component analysis method and the histogram equalization method are used to perform feature extraction and contrast enhancement. By analyzing the abnormal temperature (or grayscale) distribution in the processed image, it can be accurately determined whether the surface of the Chinese medicinal material 7 is mildewed 8.

[0051] like Figure 4As shown, in step S5 of the present invention, after the Chinese medicinal materials 7 that have become moldy 8 are removed, the infrared image sequence of the remaining Chinese medicinal materials 7 during the cooling period is processed using the principal component analysis method and the histogram equalization method. Since the internal insect bites 9 hinder the further diffusion of the heat wave, the temperature anomaly is now reflected on the upper surface of the Chinese medicinal materials 7. By analyzing the abnormal temperature (or grayscale) distribution in the processing results, it can be accurately determined whether there are insect bites 9 inside the Chinese medicinal materials 7.

[0052] like Figure 4 and Figure 5 As shown, in step S5 of the present invention, the Chinese medicinal materials 7 that are moldy 8 and insect-eaten 9 are removed, and the temperature-time distribution data of the surfaces of the remaining Chinese medicinal materials 7 are extracted (the temperature-time distribution data of multiple points are randomly selected on the surface of a single Chinese medicinal material 7 and averaged). The higher the water content of the Chinese medicinal material, the higher the specific heat capacity. Under the premise of receiving the same amount of heat, the temperature change is lower. After the outer surface of the Chinese medicinal material 7 is heated, the evaporation of water vapor will also take away some heat. Therefore, it is only necessary to record the maximum temperature rise on the upper surface of each Chinese medicinal material 7. The higher the temperature rise, the lower the water content. Through this method, it is possible to accurately determine whether there is an abnormal water content 10 inside the Chinese medicinal material.

[0053] The above content is only a specific implementation of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the present invention.

Claims

1. An infrared thermal imaging detection system for evaluating key properties of Chinese medicinal materials, comprising a computer (1) equipped with control and post-processing software, a signal transceiver (2), a high-power halogen lamp (3), an infrared thermal imager (4), an air cooling module (5), and a low light absorption rate carrier (6). The computer (1) issues a control instruction to cause the signal transceiver (2) connected thereto to generate two synchronous driving signals, which are respectively used to drive a high-power halogen lamp (3) to emit light to heat the Chinese medicinal materials (7) on the carrier (6), and to drive an infrared thermal imager (4) to perform real-time sampling during the process; After the infrared thermal imager (4) finishes sampling, the signal transceiver (2) generates an additional driving signal to drive the air cooling module (5) to supply air, so that the carrier (6) quickly returns to room temperature; at the same time, the signal transceiver (2) transmits the temperature data collected by the infrared thermal imager (4) back to the computer (1), and post-processes and analyzes the test results to achieve high-quality evaluation of the key properties of the Chinese medicinal materials (7).

2. The infrared thermal imaging detection system for evaluating key properties of Chinese medicinal materials according to claim 1, characterized in that The power of the halogen lamp (3) should be no less than 200W, and the output power should be adjustable; the infrared thermal imager (4) should have a resolution of 640×512 pixels or higher, a thermal sensitivity (NETD) of no more than 50mK, and a full-frame sampling rate of no less than 50Hz.

3. The infrared thermal imaging detection system for evaluating key properties of Chinese medicinal materials according to claim 1, characterized in that The carrier (6) is made of a material with low light absorption rate (≤15%), including but not limited to alumina ceramics or white PVC board.

4. The detection method of infrared thermal imaging detection system for evaluating key properties of Chinese medicinal materials is characterized by The following steps are involved: Step S1: placing the sliced ​​Chinese medicinal materials (7) flat on the carrier (6), ensuring that there is no overlap between the Chinese medicinal materials (7); Step S2: Complete the settings on the computer (1) equipped with control and post-processing software to enable the signal transceiver (2) to generate a low-frequency square wave and a synchronous high-frequency continuous pulse wave driving signal; Step S3: A low-frequency square wave signal drives a high-power halogen lamp (3) to emit light, which is irradiated on the upper surface of the carrier (6) and the Chinese medicinal material (7). Mildew (8), internal insect damage (9) and abnormal water content (10) in the Chinese medicinal material (7) will affect the diffusion of the heat wave, causing thermal disturbances on the upper surface of the Chinese medicinal material (7); Step S4: During the process of step S3, the high-frequency continuous pulse wave signal drives the infrared thermal imager (4) to continuously collect temperature distribution data on the upper surface of the carrier (6) and the Chinese medicinal material (7), and transmits the infrared image back to the computer (1) via the signal transceiver (2); Step S5: using a computer (1) to post-process and analyze the test results, thereby identifying mold (8), internal insect damage (9), and abnormal water content (10) in the Chinese medicinal materials (7); Step S6: After the infrared thermal imager (4) finishes sampling, the signal transceiver (2) generates a third low-frequency square wave signal with a phase lag of a specific time, which is used to drive the air cooling module (5) to supply air, so that the carrier (6) quickly returns to room temperature. In this process, the Chinese medicinal materials (7) that have just been tested are recovered and the next group of Chinese medicinal materials (7) are laid flat. After the carrier (6) returns to room temperature, the test of the next group of Chinese medicinal materials (7) begins.

5. The infrared thermal imaging detection method for evaluating key properties of traditional Chinese medicine according to claim 5, characterized in that In the steps S2 and S4, the high-frequency continuous pulse wave driving signal is a continuous square wave signal with a duty cycle of ≤5%, and the infrared thermal imager (4) captures an image each time a pulse signal is received.

6. The infrared thermal imaging detection method for evaluating key properties of Chinese medicinal materials according to claim 5, characterized in that In step S5, the computer (1) arranges the received infrared images in chronological order to form an infrared image sequence reflecting the surface temperature evolution of the Chinese medicinal material (7) and the carrier (6), compresses and extracts features from the sequence using a thermal image sequence reconstruction algorithm, and fits the temperature-time data of each pixel point using a characteristic polynomial to generate a new time-series denoised infrared image sequence.

7. The infrared thermal imaging detection method for evaluating key properties of Chinese medicinal materials according to claim 5, characterized in that In the step S4, since the light absorption rate of the carrier (6) is much lower than that of the Chinese medicinal material (7) to be inspected, the temperature rise of the upper surface of the Chinese medicinal material (7) is significantly higher than that of the carrier (6) within a short period of time (0 to 0.1 s) when the high-power halogen lamp (3) emits light. One frame of the infrared image is selected and processed using a threshold segmentation technique. The processing result is binarized to generate a mask, and the mask is applied to the entire temporal noise-reduced infrared image sequence, thereby effectively extracting the Chinese medicinal material (7) from the background of the carrier (6).

8. The infrared thermal imaging detection method for evaluating key properties of Chinese medicinal materials according to claim 5, characterized in that In the step S5, the surface mildew (8) of the Chinese medicinal material (7) will cause a change in the local light absorption rate. In the short time (0 to 0.1 s) when the high-power halogen lamp (3) emits light and heats the Chinese medicinal material (7), the change in the light absorption rate at the mildewed (8) part will cause an abnormal increase in the local temperature. At this time, the temperature disturbance caused by the internal characteristics has not yet been transmitted to the surface of the Chinese medicinal material (7); the infrared image sequence within this time period is extracted, and the principal component analysis method and the histogram equalization method are used to perform feature extraction and contrast enhancement. By analyzing the abnormal temperature (or grayscale) distribution in the processed image, it can be accurately determined whether the surface of the Chinese medicinal material (7) has become mildewed (8).

9. The infrared thermal imaging detection method for evaluating key properties of traditional Chinese medicine according to claim 5, characterized in that In the step S5, after the Chinese medicinal materials (7) that have been moldy (8) are removed, the infrared image sequence of the remaining Chinese medicinal materials (7) during the cooling period is processed using the principal component analysis method and the histogram equalization method. Since the internal insect bites (9) hinder the further diffusion of the heat wave, the temperature abnormality has been reflected on the upper surface of the Chinese medicinal materials (7). By analyzing the abnormal temperature (or grayscale) distribution in the processing result, it can be accurately determined whether the Chinese medicinal materials (7) are internally insect-eaten (9).

10. The infrared thermal imaging detection method for evaluating key properties of traditional Chinese medicine according to claim 5, characterized in that In the step S5, the Chinese medicinal materials (7) that are moldy (8) and insect-eaten (9) are removed, and the temperature-time distribution data of the surface of the remaining Chinese medicinal materials (7) are extracted (the temperature-time distribution data of multiple points are randomly selected on the surface of a single Chinese medicinal material (7) and averaged). The higher the water content of the Chinese medicinal materials, the higher the specific heat capacity. Under the premise of receiving the same amount of heat, the temperature change is lower. After the outer surface of the Chinese medicinal materials (7) is heated, the evaporation of water vapor will also take away some heat. Therefore, it is only necessary to record the maximum temperature rise of the upper surface of each Chinese medicinal material (7). The higher the temperature rise, the lower the water content. Through this method, it is possible to accurately judge whether there is an abnormal water content (10) inside the Chinese medicinal materials.

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