A method and system for screening continuity terahertz imaging images

Abstract

The present application relates to the technical field of terahertz, and discloses a screening method and system for continuous terahertz imaging images. The present application screens multiple image data obtained by a terahertz imaging device, excludes images with low clarity and completeness, thereby obtaining the accuracy of the terahertz imaging device. A threshold value is set for the accuracy, and the actual accuracy is compared with the accuracy threshold value. If the accuracy is less than the accuracy threshold value, it indicates that the accuracy of the terahertz imaging device has decreased significantly, and the imaging quality cannot be used as a basis for judging the condition of the body tissue. At this time, the terahertz imaging device needs to be overhauled. If the accuracy is greater than or equal to the accuracy threshold value, it indicates that the accuracy of the terahertz imaging device is above the standard, and the device can be used normally.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of terahertz technology, and particularly to a screening method and system for continuous terahertz imaging images. BACKGROUND

[0002] The frequency range of terahertz waves is between 0.1 THz and 10 THz. Since terahertz waves are located between millimeter waves and infrared waves, they have many unique physical properties, and thus can be applied in material detection, medical imaging, security inspection, and the like.

[0003] Image data of body tissue can be obtained by a terahertz imaging device. According to the image data, the condition of the body tissue can be determined. For example, for a wound tissue, pus water is generated in the central area of the wound due to inflammation and suppuration. Water has a high absorption degree and a low reflection degree for terahertz waves. Therefore, the image data shows a dark area. Normal skin tissue has a high reflection degree and thus shows a bright area. In this way, the healing degree of the wound tissue can be determined. However, the imaging accuracy of the terahertz imaging device is easily affected by operation, environment, and the like. Therefore, the image data obtained by the terahertz imaging device needs to be screened to remove unclear and blurred images, so that the image data can be used to accurately determine the condition. SUMMARY

[0004] In view of the problems in the prior art, the present application aims to provide a screening method and system for continuous terahertz imaging images, so that the images obtained by a terahertz imaging device can be accurately determined.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a screening method for continuous terahertz imaging images, comprising the following steps: 1. Under experimental conditions, a terahertz imaging device emits terahertz waves to irradiate body tissue. The reflected signals are processed to obtain image data. The above steps are repeated multiple times, and all the image data are saved as a reference for subsequent use. 2. An image clarity and completeness threshold is set. The clarity and completeness of each image in all the image data are recorded. Images with a clarity and completeness greater than or equal to the image clarity and completeness threshold are selected. The number of the selected images is recorded. The number of the recorded images is compared with the total number of the images to obtain the ideal accuracy of the terahertz imaging device under the experimental conditions. 3. According to the ideal accuracy of the terahertz imaging device under the experimental conditions, an accuracy threshold is set. When the terahertz imaging device is used to image body tissue, the accuracy of the terahertz imaging device is periodically obtained by using the above method. The accuracy is compared with the accuracy threshold. If the accuracy is greater than or equal to the accuracy threshold, it indicates that the terahertz imaging device is working normally. If the accuracy is less than the accuracy threshold, it indicates that the imaging quality of the terahertz imaging device is decreased. The terahertz imaging device is repaired.

[0006] In some embodiments, a second threshold is preset, the second threshold is greater than the accuracy threshold and does not exceed the accuracy threshold plus 1%, when the accuracy of the terahertz imaging device is greater than or equal to the accuracy threshold, the accuracy of the terahertz imaging device is compared with the second threshold, and different responses are made according to the comparison result.

[0007] In some embodiments, if the accuracy of the terahertz imaging device is greater than the second threshold, it indicates that the accuracy of the terahertz imaging device is far from falling below the accuracy threshold, in which case the accuracy periodic detection strategy of the terahertz imaging device is executed, if the accuracy of the terahertz imaging device is less than or equal to the second threshold, it indicates that the accuracy of the terahertz imaging device is close to falling below the accuracy threshold, in which case the periodic detection strategy of the terahertz imaging device is changed.

[0008] In some embodiments, the change mode is to divide the area between the second threshold and the accuracy threshold into several equal parts to form multiple areas, and the part above the largest area is to perform periodic inspection, and the period of periodic inspection from the largest area to the smallest area is shortened in proportion.

[0009] In some embodiments, when the accuracy of the terahertz imaging device is less than the accuracy threshold, a third threshold is preset, the third threshold is less than the accuracy threshold and does not fall below the accuracy threshold minus 1%, the accuracy of the terahertz imaging device is compared with the third threshold, and different responses are made according to the comparison result.

[0010] In some embodiments, if the accuracy of the terahertz imaging device is greater than or equal to the third threshold, it indicates that the accuracy of the terahertz imaging device is low to a low degree, in which case a temporary accuracy improvement measure is adopted to ensure that the ongoing work task is performed, and the maintenance is performed after the work task is completed, if the accuracy of the terahertz imaging device is less than the third threshold, it indicates that the accuracy of the terahertz imaging device is low to a high degree, in which case the terahertz imaging device is maintained.

[0011] In some embodiments, when the temporary accuracy improvement measure of the terahertz imaging device is temporarily performed, the device parameter adjustment and the optimized imaging setting are first attempted, the accuracy of the terahertz imaging device is obtained again after the device parameter adjustment and the optimized imaging setting are performed, and the response is made according to the obtained result.

[0012] In some embodiments, if the accuracy obtained again is greater than or equal to the accuracy threshold, it indicates that the temporary improvement measure is effective, and the temporary use is continued, if the accuracy obtained again is less than the accuracy threshold, it indicates that the temporary improvement measure is ineffective, and the temporary improvement measure is replaced by temporarily increasing the power of the terahertz wave source.

[0013] The application also provides the following technical solutions:

[0014] The application further provides a screening system for continuous terahertz imaging images, which comprises: an acquisition module, which irradiates a body tissue with terahertz waves through a terahertz imaging device, and receives reflected signals to obtain image data through processing; the acquisition module is repeatedly used to obtain multiple image data; a screening module, in which, firstly, an image clarity and integrity threshold is set, secondly, the clarity and integrity of each image in all image data is recorded, images with clarity and integrity greater than or equal to the image clarity and integrity threshold are selected, and the number of the selected images is recorded, and images with clarity and integrity lower than the image clarity and integrity threshold are screened out; then, the number of the recorded images is compared with the number of all images to obtain the accuracy of the terahertz imaging device under the experimental conditions; and a comparison module, which sets an accuracy threshold according to the accuracy of the terahertz imaging device under the experimental conditions, and compares the accuracy of the terahertz imaging device obtained by using the above method periodically with the accuracy threshold when the terahertz imaging device is actually used to image a body tissue; if the accuracy is greater than or equal to the accuracy threshold, it indicates that the terahertz imaging device is working normally; and if the accuracy is less than the accuracy threshold, it indicates that the imaging quality of the terahertz imaging device has decreased significantly, and in this case, the terahertz imaging device needs to be repaired.

[0015] The application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the screening method for continuous terahertz imaging images.

[0016] Compared with the prior art, the technical solutions provided by the application have the following beneficial effects:

[0017] Firstly, in the application, multiple image data obtained by the terahertz imaging device are screened to exclude images with low clarity and integrity, so as to obtain the accuracy of the terahertz imaging device; the accuracy threshold is set, and the accuracy in actual use is compared with the accuracy threshold; if the accuracy is less than the accuracy threshold, it indicates that the accuracy of the terahertz imaging device has decreased significantly, and the imaging quality cannot be used as a basis for judging the condition of the body tissue; in this case, the terahertz imaging device needs to be repaired; and if the accuracy is greater than or equal to the accuracy threshold, it indicates that the accuracy of the terahertz imaging device is above the standard; in this case, the device can be used normally.

[0018] Secondly, in the application, when the accuracy is lower than the accuracy threshold, the degree to which the accuracy is lower than the accuracy threshold is judged; if the degree to which the accuracy is lower than the accuracy threshold is not high, measures can be taken to temporarily improve the accuracy to avoid affecting the ongoing work, and the repair can be performed after the work is completed; and if the degree to which the accuracy is lower than the accuracy threshold is high, it indicates that it is difficult to take measures to use the device again; in this case, the device needs to be repaired immediately. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the module structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the logical structure of the present invention. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0023] The present invention provides a method for screening continuous terahertz imaging images, such as Figure 1 and Figure 2 As shown, the following steps are included:

[0024] Step 1: Under experimental conditions, a terahertz imaging device is used to emit terahertz waves to irradiate body tissue. The terahertz waves reflected by the body tissue are received by the receiver and processed and displayed as image data. Continuous transmission is performed multiple times to obtain multiple image data, which are recorded as total image data. These image data reflect the condition of the same body tissue. The reason why multiple image data are needed is that a single image data may have errors due to operation, environment, etc., so it is not accurate to judge the condition of body tissue by imaging with a single image data. By analyzing the clarity and completeness of multiple images, the errors caused by operation, environment, etc. in a single imaging can be effectively reduced, the reliability of image screening can be improved, and the influence of accidental errors that may occur in a single image on the judgment result can be avoided.

[0025] Step two, set the image clarity threshold that can be used to judge the body tissue condition, record the image clarity of each image in the total image data, select the images with image clarity greater than or equal to the image clarity threshold, record the number, and the images with image clarity less than the image clarity threshold are excluded, then compare the recorded number with the total number of images to get the accuracy of the terahertz imaging device under the experimental conditions. The image clarity here actually reflects whether the content presented by the image can be seen, for example, when the image clarity is 100%, the body tissue presented by the image can be seen in size, shape, texture, etc., when the image clarity is 90%, the body tissue presented by the image can be basically seen in size, shape, texture, etc., some small image defects do not affect the judgment of the body tissue condition, take 90% as the accuracy threshold, below 90%, the image presents obvious defects, affecting the judgment, in this case, this image data cannot be used.

[0026] Step three, set the accuracy threshold according to the ideal accuracy of the terahertz imaging device under the experimental conditions, when using the terahertz imaging device to image the body tissue, periodically obtain the accuracy of the terahertz imaging device by the above method, compare the accuracy with the accuracy threshold, and get different responses according to the comparison result. If the accuracy is greater than or equal to the accuracy threshold, it means that the terahertz imaging device can work normally, and the image data obtained by imaging can be used as the basis for judging the body tissue condition. If the accuracy is less than the accuracy threshold, it means that the imaging quality of the terahertz imaging device has decreased significantly, at this time, the terahertz imaging device needs to be repaired. It is worth mentioning that there are many ways to set the accuracy threshold according to the accuracy of the terahertz imaging device under the experimental conditions, for example, calculate the accuracy of the terahertz imaging device under different environmental conditions, set the accuracy threshold slightly lower than or equal to the average accuracy of the device, for example, if the average accuracy under the experimental conditions is 90%, the accuracy threshold can be set to 90% or slightly lower than 90%. Or, according to the size of the standard deviation, set a reasonable accuracy range. For example, if the standard deviation is small, the terahertz imaging device performs stably, a higher accuracy threshold can be set. If the standard deviation is large, a wider range can be set to adapt to possible fluctuations. The accuracy threshold is equal to the average accuracy minus the standard deviation, for example, if the average accuracy of the terahertz imaging device is 90% and the standard deviation is 5%, the accuracy threshold can be set to 90%-5%=85%.

[0027] In general, the screening method of the terahertz imaging image includes three main steps. First, the terahertz imaging device is used to continuously emit terahertz waves, and the same body tissue is imaged multiple times to obtain multiple image data, so as to reduce the errors caused by operation, environment, etc. Second, the image clarity and integrity threshold is set, and the clarity and integrity of all images are evaluated, and the images with clarity and integrity greater than or equal to the clarity and integrity threshold are screened out, and the accuracy of the terahertz imaging device is calculated. For example, when the image clarity is 90%, the body tissue in the image is roughly clear, and the image below the standard is excluded. Finally, according to the accuracy data under the experimental conditions, the accuracy threshold is set. In actual application, the accuracy threshold can be set according to the average accuracy or standard deviation of the device. If the accuracy is greater than or equal to the accuracy threshold, it means that the device is working normally; if it is lower than the accuracy threshold, it means that the imaging quality is decreased and needs to be repaired. Through this method, the stability of the terahertz imaging device under different environments can be ensured, and the reliability of the imaging data can be ensured.

[0028] Based on the above, when the accuracy of the terahertz imaging device is greater than or equal to the accuracy threshold, the image presented by the terahertz imaging device can be used as a basis for accurate judgment. However, if the accuracy of the terahertz imaging device has approached the accuracy threshold, it is necessary to worry that the accuracy of the terahertz imaging device will suddenly decrease below the accuracy threshold, because the accuracy threshold is equivalent to a limit, which is the minimum standard for the image presented by the terahertz imaging device to be used as a basis for accurate judgment. The closer to this minimum standard, the more likely it will decrease below the minimum standard. Therefore, a second threshold greater than the accuracy threshold and close to the accuracy threshold is set, the second threshold is at most 1% more than the accuracy threshold, so that the second threshold is close to the accuracy threshold. The accuracy of the terahertz imaging device is compared with the second threshold, and different responses are obtained according to the comparison result. If the accuracy of the terahertz imaging device is greater than the second threshold, it indicates that the accuracy of the terahertz imaging device is still far from the accuracy threshold, that is, the accuracy of the terahertz imaging device is still far from the minimum standard. In this case, the accuracy periodic detection strategy of the terahertz imaging device can be executed. If the accuracy of the terahertz imaging device is less than or equal to the second threshold, it indicates that the accuracy of the terahertz imaging device has approached the accuracy threshold, that is, the accuracy of the terahertz imaging device has approached the minimum standard. In this case, in order to ensure that the terahertz imaging device can be detected in time when the accuracy decreases to the minimum standard, the periodic detection strategy of the terahertz imaging device is changed. In general, when the accuracy of the terahertz imaging device approaches the accuracy threshold, although it can still be used as a basis for judgment, there is still a risk that the accuracy may suddenly decrease below the accuracy threshold. Therefore, a second threshold greater than the accuracy threshold and close to the accuracy threshold can be set to further detect the state of the device (for example, the accuracy threshold is 90%, and the second threshold is 91%). If the accuracy of the terahertz imaging device is greater than the second threshold, it indicates that the performance of the device is still stable and has a certain margin from the minimum standard. At this time, the device can continue to be monitored according to the regular periodic detection strategy. However, if the accuracy of the device is less than or equal to the second threshold, it indicates that the accuracy has approached the minimum standard. In order to detect the decrease of the accuracy below the accuracy threshold in time, the periodic detection strategy needs to be adjusted to strengthen the monitoring frequency and sensitivity of the device, so as to ensure that the imaging quality of the device can be detected and maintained in time before it decreases. In this way, the sudden decrease of the device performance can be effectively avoided to cause the distortion of the imaging data.

[0029] The changed manner is as follows: divide the area between the second threshold Y2 and the accuracy threshold Y1 into n equal parts, the equal part of each area is (Y2-Y1) / n, and all areas are arranged in order from small to large, and the first area n1 (including the accuracy threshold Y1), the second area n2,..., and the n area nn (including the second threshold Y2) are arranged in order. The inspection strategy above the n area nn is regular inspection, and assuming that the period of regular inspection is M, the period M of inspection is shortened proportionally from the n area nn to the first area n1. For example, assuming that the accuracy threshold Y1 is 90%, the second threshold Y2 is 91%, and the area between 90% and 91% is divided into 10 equal parts, and the equal part of each area is (91%-90%) / 10=0.1%, so the first area n1 is 90% (including) -90.1%, the second area n2 is 90.1% (including) -90.2%, the third area n3 is 90.2% (including) -90.3%, the fourth area n4 is 90.3% (including) -90.4%, the fifth area n5 is 90.4% (including) -90.5%, the sixth area n6 is 90.5% (including) -90.6%, the seventh area n7 is 90.6% (including) -90.7%, the eighth area n8 is 90.7% (including) -90.8%, the ninth area n9 is 90.8% (including) -90.9%, and the tenth area n10 is 90.9% (including) -91% (including). The period of regular inspection above the tenth area n10 is 40 hours once, so the inspection period of the tenth area n10, 90.9% (including) -91% (including), is 38 hours once, the inspection period of the ninth area n9, 90.8% (including) -90.9%, is 36 hours once, the inspection period of the eighth area n8, 90.7% (including) -90.8%, is 34 hours once, the inspection period of the seventh area n7, 90.6% (including) -90.7%, is 32 hours once, the inspection period of the sixth area n6, 90.5% (including) -90.6%, is 30 hours once, the inspection period of the fifth area n5, 90.4% (including) -90.5%, is 28 hours once, the inspection period of the fourth area n4, 90.3% (including) -90.4%, is 26 hours once, the inspection period of the third area n3, 90.2% (including) -90.3%, is 24 hours once, the inspection period of the second area n2, 90.1% (including) -90.2%, is 22 hours once, and the inspection period of the first area n1, 90% (including) -90.1%, is 20 hours once.

[0030] In addition, when the accuracy of the terahertz imaging device falls below the accuracy threshold, if it is just below the accuracy threshold, that is, less than the accuracy threshold but close to the accuracy threshold, in order to ensure work, some methods can be temporarily used to improve the accuracy of the terahertz imaging device to the accuracy threshold and above, because if it is directly shut down for maintenance, it may affect the work being carried out. Many times, the terahertz imaging device may be performing a critical experiment or work task, at which time if it is immediately shut down for maintenance, it may cause the experiment, work task, etc. to be interrupted or delayed, especially in some real-time or time-sensitive work, shutdown may affect the entire work flow and project progress. In order to avoid this situation, temporary measures to improve accuracy should be taken to ensure that the device can continue to work until the work task is completed, and then shut down for maintenance. In addition, when the accuracy of the terahertz imaging device is only slightly lower than the accuracy threshold, it means that the performance of the terahertz imaging device has not decreased much and can still meet certain work requirements. The terahertz imaging device may only have a slight performance fluctuation and not cause serious distortion or failure. In this case, complete shutdown for maintenance is not necessary, because the work can still continue, only temporary measures such as adjusting device parameters and optimizing imaging settings are needed to restore normal accuracy in the short term. In order to achieve the above goal, a third threshold less than the accuracy threshold but close to the accuracy threshold is set, the third threshold is at least not less than the accuracy threshold minus 1%, so that the third threshold is close to the accuracy threshold, when the accuracy of the terahertz imaging device is less than the accuracy threshold, the accuracy of the terahertz imaging device is compared with the third threshold, and different responses are obtained according to the comparison result. If the accuracy of the terahertz imaging device is greater than or equal to the third threshold, it means that the accuracy of the terahertz imaging device is lower than the accuracy threshold to a low degree, in this case, some methods can be temporarily used to improve the accuracy of the terahertz imaging device to the accuracy threshold or above to complete the current work, and then when there is idle time, shut down the terahertz imaging device for maintenance. If the accuracy of the terahertz imaging device is less than the third threshold, it means that the accuracy of the terahertz imaging device is lower than the accuracy threshold to a high degree, and the accuracy has decreased significantly below the threshold, in this case, maintenance of the terahertz imaging device needs to be prepared immediately to prevent the imaging quality from further decreasing and affecting the work progress. In this way, the problem of device maintenance and accuracy recovery can be flexibly handled on the premise of ensuring that the work is not affected.

[0031] For how to temporarily improve the accuracy of the terahertz imaging device, in addition to the above-mentioned adjustment of device parameters, optimization of imaging settings, etc. can be tried when slightly below the accuracy threshold, if the adjustment of device parameters, optimization of imaging settings measures effective, according to this measure can be, if the adjustment of device parameters, optimization of imaging settings measures invalid, also can be through the temporary increase of terahertz wave source power to improve the signal quality, thus temporarily enhance the imaging quality. Because the increase of terahertz wave source power will directly improve the intensity of imaging signal, thus in a short time to enhance the signal to noise ratio, make the image more clear, and improve the signal penetration ability, to thick tissue or high absorption area imaging more effective, at the same time, reduce the signal attenuation caused by environmental noise. However, the terahertz wave source in high power operation will produce more heat, long-term operation may cause the component wear and tear accelerated, shorten the service life of the device, therefore, the increase of terahertz wave source power is only suitable for short-term temporary increase when there is work task not completed. When the work task is completed, still need to be overhauled.

[0032] In summary, when the accuracy of the terahertz imaging device is below the accuracy threshold but still close to the accuracy threshold, in order to avoid the impact of the ongoing key work of shutdown maintenance, temporary measures can be taken to restore the accuracy of the device. At this time, the performance of the device decreases slightly, it may only appear slight fluctuations, still can be through the adjustment of device parameters, optimization of imaging settings means short-term recovery of normal accuracy, continue to complete the work task. In order to achieve this goal, a third threshold close to the accuracy threshold can be set, when the accuracy of the device is higher than the third threshold, it indicates that the performance of the device is not serious, temporary measures can be taken to maintain operation, and then idle time again for comprehensive overhaul; If lower than the third threshold, it needs to be prepared immediately shutdown maintenance, in order to avoid further influence the imaging quality. In addition, the increase of terahertz wave source power is an effective short-term means to improve the accuracy, can enhance the signal strength, improve the imaging quality, but long-term high power operation will accelerate the wear and tear of the components, affect the service life of the device, therefore, this is only suitable for short-term use when the task is not completed. In short, through these temporary measures, the device can be ensured to run normally without affecting the work progress, and the necessary overhaul can be carried out after the task is completed.

[0033] The processes described above with reference to the flowcharts can be implemented as computer software programs in accordance with embodiments of the present disclosure. Embodiments of the present disclosure include a computer program product comprising a computer program carried on a computer readable medium, the computer program comprising program code for performing the methods illustrated by the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication section, and / or installed from a detachable medium. When the computer program is executed by a central processing unit, the above-described functions defined in the methods of the present application are performed. It should be noted that the computer readable medium of the present application can be a computer readable signal medium or a computer readable storage medium or any combination of the two. The computer readable storage medium may, for example, but not limited to, be an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or any combination of the above. More specific examples of the computer readable storage medium can include, but are not limited to, an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical fiber, a portable compact disk read-only memory, an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, the computer readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus or device. In the present application, the computer readable signal medium can include a data signal carried in a baseband or as a part of a carrier wave, in which a computer readable program code is carried. Such a propagated data signal can take many forms, including but not limited to, an electromagnetic signal, an optical signal, or any suitable combination of the above. The computer readable signal medium can also be any computer readable medium that can send, propagate or transfer a program for use by or in connection with an instruction execution system, apparatus or device. The program code contained on the computer readable medium can be transmitted by any suitable medium, including but not limited to, wireless, wire, optical cable, RF, or any suitable combination of the above.

[0034] The computer program product of the present application can be a computer program product, which is a machine-readable medium (or media) having stored therein some code (i.e., some computer code or software) that, when executed by a machine, causes the machine to perform any of the functions disclosed herein. Note that the computer program product can be a non-transitory computer program product. The term "non-transitory" does not mean that the computer program product is entirely non-transitory during the entire period of time that the computer program product exists or is in use. The term "non-transitory" means that the computer program product is not maintained in a transitory signal form for any duration of time. In other words, the computer program product is maintained in a non-transitory, tangible form for at least some duration of time while the computer program product is in use.

[0035] Those skilled in the art will understand that the above description is only one implementation of the application in view of the teachings of the present application. Therefore, many changes and modifications can be made by those skilled in the art to the functions and implementations described herein without departing from the scope of the present application which is set forth in the following claims.

Claims

1. A method for screening continuous terahertz imaging images, characterized in that: The following steps are involved: First, under experimental conditions, the terahertz imaging device emits terahertz waves to illuminate body tissues. The reflected signals are processed to obtain image data. This is repeated multiple times to obtain multiple image data, and all image data are saved as a basis for subsequent reference. Second, set an image clarity and completeness threshold, record the clarity and completeness of each image in all image data, select images with image clarity and completeness greater than or equal to the image clarity and completeness threshold, record the number, and compare the recorded number with the number of all images to obtain the ideal accuracy of the terahertz imaging device under experimental conditions; Third, an accuracy threshold is set based on the ideal accuracy of the terahertz imaging device under experimental conditions. When the terahertz imaging device is actually used for body tissue imaging, the accuracy of the terahertz imaging device is regularly obtained using the above method, and the accuracy is compared with the accuracy threshold. If the accuracy is greater than or equal to the accuracy threshold, it means that the terahertz imaging device is working normally. If the accuracy is less than the accuracy threshold, it means that the imaging quality of the terahertz imaging device has deteriorated, and the terahertz imaging device should be repaired. A second threshold is preset, which is greater than the accuracy threshold and does not exceed the accuracy threshold plus 1%. When the accuracy of the terahertz imaging device is greater than or equal to the accuracy threshold, the accuracy of the terahertz imaging device is compared with the second threshold, and different responses are obtained according to the comparison result; if the accuracy of the terahertz imaging device is greater than the second threshold, it indicates that the accuracy of the terahertz imaging device is far from falling to the accuracy threshold. In this case, a periodic detection strategy for the accuracy of the terahertz imaging device is executed; if the accuracy of the terahertz imaging device is less than or equal to the second threshold, it indicates that the accuracy of the terahertz imaging device is close to falling to the accuracy threshold. In this case, the periodic detection strategy for the terahertz imaging device is changed.

2. The method for screening continuous terahertz imaging images according to claim 1, characterized in that: The change method is to divide the area between the second threshold and the accuracy threshold into several equal parts to form multiple areas. In these areas, the part above the largest area is subject to regular inspection, and the period of regular inspection from the largest area to the smallest area is shortened proportionally.

3. The method for screening continuous terahertz imaging images according to claim 1, characterized in that: When the accuracy of the terahertz imaging device is less than the accuracy threshold, a third threshold is preset, the third threshold is less than the accuracy threshold and not less than the accuracy threshold minus 1%, the accuracy of the terahertz imaging device is compared with the third threshold, and different responses are obtained based on the comparison results.

4. The method for screening continuous terahertz imaging images according to claim 3, characterized in that: If the accuracy of the terahertz imaging device is greater than or equal to the third threshold, it indicates that the accuracy of the terahertz imaging device is lower than the accuracy threshold to a low degree. In this case, measures are taken to temporarily improve the accuracy to ensure the ongoing work task, and maintenance is carried out after the work task is completed. If the accuracy of the terahertz imaging device is less than the third threshold, it indicates that the accuracy of the terahertz imaging device is lower than the accuracy threshold to a high degree. In this case, the terahertz imaging device is repaired.

5. The method for screening continuous terahertz imaging images according to claim 4, characterized in that: When temporarily taking measures to improve the accuracy of the terahertz imaging device, first try to adjust the device parameters and optimize the imaging settings. After adjusting the device parameters and optimizing the imaging settings, obtain the accuracy of the terahertz imaging device again and respond based on the results obtained again.

6. The method for screening continuous terahertz imaging images according to claim 5, characterized in that: If the accuracy rate obtained again is greater than or equal to the accuracy threshold, it indicates that this temporary improvement measure is effective and continues to be used temporarily. If the accuracy rate obtained again is less than the accuracy threshold, it indicates that this temporary improvement measure is invalid and the temporary improvement measure is replaced by temporarily increasing the power of the terahertz wave source.

7. A continuous terahertz imaging image screening system, characterized in that: The screening system is used to perform the screening method according to any one of claims 1 to 6, comprising: An acquisition module, which uses a terahertz imaging device to emit terahertz waves to illuminate body tissues. A receiver receives the reflected signal and processes it to obtain image data. This is repeated multiple times to obtain multiple image data. A screening module, in which a threshold for image clarity and completeness is first set, and then the clarity and completeness of each image in all image data is recorded. Images with image clarity and completeness greater than or equal to the threshold are selected and the number is recorded. Images with image clarity and completeness below the threshold are screened out and then the recorded number is compared with the number of all images to obtain the accuracy of the terahertz imaging device under experimental conditions; A comparison module sets an accuracy threshold based on the accuracy of the terahertz imaging device under experimental conditions. When the terahertz imaging device is actually used for body tissue imaging, the accuracy of the terahertz imaging device is regularly obtained using the above method, and the accuracy is compared with the accuracy threshold. If the accuracy is greater than or equal to the accuracy threshold, it means that the terahertz imaging device is working normally. If the accuracy is less than the accuracy threshold, it means that the imaging quality of the terahertz imaging device has been significantly reduced. In this case, the terahertz imaging device is repaired.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement the method for screening continuous terahertz imaging images as described in any one of claims 1 to 6.

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