Method and system for determining the burning state of a cigarette after being subjected to a force

Abstract

The application discloses a method and system for judging the burning state of a cigarette after force is applied S , the length of the burning cone is H s , and the diameter of the cigarette is D. The cigarette is first tapped to show a complete burning cone shape, and then an image algorithm is used to judge whether the burning cone is skewed. If the burning cone is skewed and the area exceeds a set threshold, it is determined that the burning cone has fallen. If the burning cone is not skewed, the state of the burning cone is judged. The application uses image detection and infrared temperature measurement to judge the falling of the burning cone, extracts the shape characteristics of the burning cone through an image algorithm, and identifies the burning state of the cigarette after force is applied. The method can realize many abnormal burning states and overcome the limitation that the current falling of the burning cone can only output two test results, i.e. falling and not falling.

Description

Technical Field

[0001] The present invention belongs to the technical field of tobacco product quality detection, and in particular relates to a method for judging the burning state of a cigarette after being subjected to stress, which can realize the judgment of different burning states of a cigarette after being subjected to stress. Background Art

[0002] The combustion cone refers to the conical hot body formed at the end of a cigarette during smoking. The fall of the combustion cone can interrupt puffing, affecting the sensory quality of the cigarette during smoking and may even cause a fire. Cigarette combustion is the process by which tobacco and cigarette paper work together to produce smoke, which is the final form of cigarette consumption. Smoke contains harmful substances such as tar, nicotine, and CO. The combustion cone of a cigarette is a major factor in the production of smoke, and the structure and shape of the combustion cone affect the release of harmful gases in the smoke. Therefore, achieving joint online detection of cigarette burning rate, combustion cone morphology, and combustion cone fall is of great significance for reducing tar and harm, reducing combustion cone fall, and improving the sensory quality of cigarettes. Studies have shown that the shape of a cigarette's combustion cone is closely related to its smoldering rate and the fall of the combustion cone. The smoldering rate is significantly positively correlated with the peak area and half-peak height of the combustion cone, and negatively correlated with the deviation angle. The faster the cigarette burns, the higher the half-peak height of the combustion cone, the smaller the deviation angle, and the larger the combustion cone area. This is when the combustion cone is more likely to fall off or become noticeably skewed (causing interruption of puffing).

[0003] Many studies have been conducted in China to study the factors that cause the burning cone to fall through the detection of the burning cone morphology. Mu Lin et al. invented a method for quantitatively evaluating the shape of the burning cone, using a camera to capture an image of the burning cone, and using Imagej and Photoshop software to obtain the burning cone's height, cone top angle, left and right corner values, cone area value and other parameters based on the image. Zhang Zhen et al. invented a device for detecting the shape of the burning cone of a cigarette, including a smoking machine, a sensor, a camera and a detection system. The publication number CN109709145B discloses a device and method for identifying the falling of the burning cone of a cigarette, which provides a method for judging the falling head of the burning cone by combining image recognition and infrared temperature measurement, which can realize the automatic judgment of the falling head of the burning cone.

[0004] The above invention realizes the detection of the combustion cone shape and the burning cone falling head, but can only give the combustion cone shape parameters during normal combustion and the judgment of the normal burning cone falling state (the burning cone falls completely and the burning cone is obviously skewed). However, for many abnormal burning states, including "the cigarette is not ignited", "the burning cone has not fallen, the cigarette paper is turned outside", "the burning cone falls completely, the cigarette paper burns empty", "the burning cone is not skewed, but brings out yellow tobacco", etc., it is impossible to give a state judgment. The misjudgment rate in the test of the burning cone falling process is high, which affects the research and development personnel's research on the factors affecting the burning cone falling head. SUMMARY

[0005] The technical problem to be solved by the present application is how to determine the current state of the burning cone when the burning cone is in an abnormal combustion state.

[0006] The present application solves the above technical problems by the following technical means:

[0007] A method for determining the burning state of a cigarette after being subjected to force, assuming that the original length of the cigarette is L S , the length of the burning cone is H s , and the diameter of the cigarette is D; the cigarette is first tapped to show a complete burning cone shape; then an image algorithm is used to determine whether the burning cone is skewed, and if the burning cone is skewed and the area exceeding the parallel line is greater than a set threshold value, it is determined to be a fallen head; if the burning cone is not skewed, the state of the burning cone is determined, specifically including the following steps:

[0008] Step 1, record the area of the burning cone exceeding the parallel line, denoted as S out , if it does not exceed, S out = 0; the parallel line is the upper and lower edge line of the cigarette;

[0009] Step 2, use a color channel conversion algorithm to convert the cigarette image from RGB space to HSV space, calculate the gray feature map of the image, extract the foreground target, use a filtering algorithm with an adaptive threshold algorithm to eliminate the tipping paper part, and obtain the partial area image of the burning cone;

[0010] Step 3, use a contour extraction algorithm to extract the contour of the burning cone and calculate the peak area S of the burning cone;

[0011] Step 4, traverse the pixel information of the burning cone partial image, calculate the gray gradient information, and find the position of the vertex of the burning cone, the position of the middle point of the left and right edges, and the position of the bottom edge point;

[0012] Step 5, calculate the acute angle between the line connecting the vertex and the middle point of the two edges and the horizontal line, denoted as the deviation angle α1 and the deviation angle α2 of the burning cone;

[0013] Step 6, calculate the width of the line connecting the two edge points, denoted as the half-peak width W of the burning cone;

[0014] Step 7, calculate the height from the vertex to the bottom edge point, denoted as the peak height H c of the burning cone, and calculate the length of the cigarette L c ;

[0015] Step 8, combine the temperature T information of the burning cone to give the following determination:

[0016] (1) when T ≤ a set threshold value, (L S - 2) ≤ Lc ≤ (LS +2), indicating that the combustion cone has no temperature and the cigarette length has not changed, indicating that the current combustion state is that the cigarette is not ignited;

[0017] (2) When T> set threshold, S out ≤ set threshold, n≤H c / H s ≤m, indicating that the current burning state is that the burning cone has not fallen and the cigarette paper is turned outward;

[0018] (3) When T> set threshold, L c <(L S —2), H c / H s <n and half-peak width W / D>x,n <x<m,说明卷烟燃烧锥长度突然变短,且半峰宽与燃烧锥直径基本一致,表明当前燃烧状态为燃烧锥完全掉落,卷烟纸空头燃烧;

[0019] (4) When T> set threshold, H c / H s >m, indicating that the length of the combustion cone suddenly becomes longer, indicating that the current combustion state is that the combustion cone is not skewed, but brings out yellow tobacco; c It is the measured length after the cigarette support is struck.

[0020] The present invention combines image detection with infrared temperature measurement to judge whether the combustion cone has fallen, and extracts the morphological features of the combustion cone through image algorithms to identify the burning state of the cigarette after being subjected to force. The method can realize the judgment of many abnormal burning states, including "the cigarette is not ignited", "the combustion cone has not fallen, and the cigarette paper is turned outward", "the combustion cone has fallen completely, and the cigarette paper is burning empty", "the combustion cone is not skewed, but yellow tobacco is brought out", etc., thereby improving the accuracy of identifying the falling end of the combustion cone.

[0021] Furthermore, before making a judgment, the cigarette is fixed in a certain position and struck with a rated external force.

[0022] Furthermore, an image is acquired from the side of the burning cone of the cigarette.

[0023] Furthermore, a camera and an infrared temperature sensor are set up, wherein the camera is used to obtain an image of the combustion cone, and the infrared temperature sensor is used to detect the temperature of the combustion cone.

[0024] Corresponding to the above method, the present invention further provides a system for determining the burning state of a cigarette after being subjected to force, comprising:

[0025] The knocking module is used to knock the cigarette to make it show a complete burning cone shape;

[0026] An image acquisition module, used for acquiring a combustion cone image;

[0027] A temperature acquisition module is used to obtain the temperature of the combustion cone;

[0028] The judgment module is used to judge the current state of the combustion cone, which specifically includes the following steps:

[0029] Assume that the original length of the cigarette is L S 、The length of the combustion cone is H s , the cigarette diameter is D; then, an image algorithm is used to determine whether the combustion cone is skewed. If the combustion cone is skewed and the excess area is greater than a set threshold, it is determined to be a fallen end; if the combustion cone is not skewed, the combustion cone state is determined, which specifically includes the following steps:

[0030] Step 1: Record the area of ​​the combustion cone beyond the parallel line, denoted as S out If not exceeded, S out =0; the parallel lines are the upper and lower edges of the cigarette;

[0031] Step 2: Using a color channel conversion algorithm, convert the cigarette image from RGB space to HSV space, calculate the image's grayscale feature map, extract the foreground object, and use a filtering algorithm plus an adaptive threshold algorithm to remove the tipping paper portion to obtain an image of the combustion cone area.

[0032] Step 3: Use the contour extraction algorithm to extract the combustion cone contour and calculate the peak area S of the combustion cone;

[0033] Step 4: traverse the pixel information of the combustion cone image, calculate the grayscale gradient information, and find the position of the top point of the combustion cone, the middle point of the left and right edges of the combustion cone, and the bottom edge point;

[0034] Step 5, calculate the acute angles between the line connecting the vertex and the midpoints of the two side edges and the horizontal line, and record them as the deviation angles α1 and α2 of the combustion cone;

[0035] Step 6: Calculate the width of the line connecting the edge points on both sides, and record it as the half-peak width W of the combustion cone;

[0036] Step 7: Calculate the height from the vertex to the bottom edge point, which is recorded as the peak height H of the combustion cone. c , calculate the length of the cigarette as L c ;

[0037] Step 8: Combined with the combustion cone temperature T information, make the following judgment:

[0038] (1) When T≤set threshold, (L S —2)≤Lc≤(L S +2), indicating that the combustion cone has no temperature and the cigarette length has not changed, indicating that the current combustion state is that the cigarette is not ignited;

[0039] (2) When T> set threshold, S out ≤ set threshold, n≤H c / H s ≤m, indicating that the current burning state is that the burning cone has not fallen and the cigarette paper is turned outward;

[0040] (3) When T> set threshold, L c <(L S —2), H c / H s <n and half-peak width W / D>x,n <x<m,说明卷烟燃烧锥长度突然变短,且半峰宽与燃烧锥直径基本一致,表明当前燃烧状态为燃烧锥完全掉落,卷烟纸空头燃烧;

[0041] (4) When T> set threshold, H c / H s >m, indicating that the length of the combustion cone suddenly becomes longer, indicating that the current combustion state is that the combustion cone is not skewed, but brings out yellow tobacco; c It is the measured length after the cigarette support is struck.

[0042] Furthermore, before making a judgment, the cigarette is fixed in a certain position and struck with a rated external force.

[0043] Furthermore, the image acquisition module acquires images from the side of the burning cone of the cigarette.

[0044] Furthermore, the image acquisition module is a camera mounted on the side of the cigarette.

[0045] Furthermore, the temperature acquisition module detects the combustion cone temperature through an infrared temperature sensor.

[0046] The advantages of the present invention are:

[0047] The present invention uses a combination of image detection and infrared temperature measurement to judge the falling of the combustion cone, and extracts the morphological features of the combustion cone through image algorithms to identify the burning state of the cigarette after being subjected to force. This method can realize the judgment of many abnormal burning states, including "the cigarette is not ignited", "the combustion cone has not fallen, and the cigarette paper is turned outward", "the combustion cone has completely fallen, and the cigarette paper is burning empty", "the combustion cone is not skewed, but yellow tobacco is brought out", etc., thereby improving the accuracy of the combustion cone falling head recognition. It avoids the influence of various special combustion states on the test results of the combustion cone falling head, and has high detection accuracy; it overcomes the limitation that the current combustion cone falling can only output two test results of "falling" and "not falling", and can provide the cigarette burning state in various combustion cone falling head tests; the combustion cone feature information provides data support for the study of the factors affecting the combustion cone falling head. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 Flowchart for identifying the burning state of a cigarette during the burning cone drop test in an embodiment of the present invention

[0049] Figure 2 A schematic diagram of a combustion cone according to an embodiment of the present invention is shown;

[0050] Figure 3 A schematic diagram of an unlit cigarette according to an embodiment of the present invention is shown;

[0051] Figure 4 It shows a schematic diagram of "the burning cone does not fall off and the cigarette paper turns outward" according to an embodiment of the present invention;

[0052] Figure 5 A schematic diagram of "combustion cone completely falling and cigarette paper empty end burning" according to an embodiment of the present invention is shown;

[0053] Figure 6 A schematic diagram of "the combustion cone is not skewed, but brings out yellow tobacco" according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0055] A method for judging the burning state of a cigarette after being subjected to force, assuming that the original length of the cigarette is L S 、The length of the combustion cone is H s , the diameter of the cigarette is D; first knock the cigarette to make it show the complete combustion cone shape; then use the image algorithm to determine whether the combustion cone is skewed. If the combustion cone is skewed and the excess area is greater than the set threshold, it is determined to be a fallen head; if the combustion cone is not skewed, then enter the combustion cone state judgment, such as Figure 1 As shown, the specific steps include:

[0056] Step 1: Record the area of ​​the combustion cone beyond the parallel line, denoted as S out If not exceeded, S out =0; the parallel lines are the upper and lower edges of the cigarette;

[0057] Step 2: Using a color channel conversion algorithm, convert the cigarette image from RGB space to HSV space, calculate the image's grayscale feature map, extract the foreground object, and use a filtering algorithm plus an adaptive threshold algorithm to remove the tipping paper portion to obtain an image of the combustion cone area.

[0058] Step 3: Use the contour extraction algorithm to extract the combustion cone contour and calculate the peak area S of the combustion cone;

[0059] Step 4: traverse the pixel information of the combustion cone image, calculate the grayscale gradient information, and find the position of the top point of the combustion cone, the middle point of the left and right edges of the combustion cone, and the bottom edge point;

[0060] Step 5, calculate the acute angles between the line connecting the vertex and the midpoints of the two side edges and the horizontal line, and record them as the deviation angles α1 and α2 of the combustion cone;

[0061] Step 6: Calculate the width of the line connecting the edge points on both sides, and record it as the half-peak width W of the combustion cone;

[0062] Step 7: Calculate the height from the vertex to the bottom edge point, which is recorded as the peak height H of the combustion cone. c , calculate the length of the cigarette as L c ;

[0063] Step 8: Combined with the combustion cone temperature T information, make the following judgment:

[0064] (1) When T≤set threshold, (L S —2)≤Lc≤(L S +2), indicating that the combustion cone has no temperature and the cigarette length has not changed, indicating that the current combustion state is that the cigarette is not ignited;

[0065] (2) When T> set threshold, S out ≤ set threshold, n≤H c / H s ≤m, indicating that the current burning state is that the burning cone has not fallen and the cigarette paper is turned outward;

[0066] (3) When T> set threshold, L c <(L S —2), H c / H s <n and half-peak width W / D>x,n <x<m,说明卷烟燃烧锥长度突然变短,且半峰宽与燃烧锥直径基本一致,表明当前燃烧状态为燃烧锥完全掉落,卷烟纸空头燃烧;

[0067] (4) When T> set threshold, H c / H s >m, indicating that the length of the combustion cone suddenly becomes longer, indicating that the current combustion state is that the combustion cone is not skewed, but brings out yellow tobacco; c It is the measured length after the cigarette support is struck.

[0068] The following is an explanation of the above method using specific data:

[0069] The system knocks the cigarette sample in combustion by knocking device, so that it shows complete combustion cone shape, records the combustion cone temperature by infrared temperature sensor, determines the combustion cone falling condition by image recognition method, and if the image recognition concludes that the combustion cone does not exceed the parallel line or the exceeding area is less than the threshold value, the cigarette combustion state judgment is started. The camera captures the cigarette combustion image, converts the cigarette image from RGB space to HSV space by color channel conversion algorithm, calculates the gray feature map of the image, extracts the foreground target, eliminates the tipping paper part by using filtering algorithm and adaptive threshold algorithm, and obtains the combustion cone partial area image. The contour extraction algorithm is used to extract the contour of the combustion cone, and the peak area of the combustion cone is calculated; the pixel information of the combustion cone partial image is traversed, the gray gradient information is calculated, and the combustion cone vertex position point, combustion cone left and right side edge middle point position and bottom edge point position are found out; the acute angle between the connecting line of the fixed point and the two side edge middle points and the horizontal line is calculated, which is recorded as the deviation angle a1 and the deviation angle a2 of the combustion cone; the connecting line width of the two side edge points is calculated, which is recorded as the half peak width W of the combustion cone; the height from the vertex to the bottom edge point is calculated, which is recorded as the peak height H of the combustion cone c , and the cigarette length L c is calculated as shown in Figure 2 . In combination with the combustion cone temperature T information, the following judgments are given through data analysis: when T≤set threshold value, (L S —2)≤Lc≤(L S +2), it is indicated that the combustion cone has no temperature and the cigarette length has no change, which indicates that the current combustion state is "cigarette not lit", as shown in Figure 3 ; when T> set threshold value, S out ≤set threshold value, 0.8≤H c / H s ≤1.1, it is indicated that the current combustion state is "combustion cone not fallen, cigarette paper turned out", as shown in Figure 4 ; when T> set threshold value, Lc<(L S —2), H c / H s <0.8 and half peak width W / D>0.9, it is indicated that the length of the cigarette combustion cone is suddenly shortened, and the half peak width is basically the same as the diameter of the combustion cone, which indicates that the current combustion state is "combustion cone completely fallen, cigarette paper empty burning", as shown in Figure 5 ; when T> set threshold value, H c / H s >1.1, it is indicated that the length of the combustion cone is suddenly lengthened, which indicates that the current combustion state is "combustion cone not skewed, but with yellow tobacco", as shown in Figure 6 .

[0070] In the embodiment, the camera is arranged on the side of the cigarette, and is used to acquire the side image of the combustion cone. The infrared temperature sensor is used to measure the temperature of the combustion cone.

[0071] The working principle of the embodiment is: the upper and lower edges of the cigarette are recognized as parallel lines by image processing technology, and then the shape of the burning cone after being tapped is judged according to the relationship between the shape of the burning cone and the parallel lines.

[0072] Corresponding to the above method, the application also provides a system for judging the burning state of a cigarette after being stressed, comprising:

[0073] A tapping module is configured to tap the cigarette to make it show a complete burning cone shape.

[0074] An image acquisition module is configured to acquire a burning cone image.

[0075] A temperature acquisition module is configured to acquire the temperature of the burning cone.

[0076] A judging module is configured to judge the current state of the burning cone, and specifically includes the following steps:

[0077] Supposing that the original length of the cigarette is L S , the length of the burning cone is H s , and the diameter of the cigarette is D, then whether the burning cone is skewed is judged by an image algorithm, if the burning cone is skewed and the area exceeding the set threshold is greater than the set threshold, it is determined that the burning cone falls; if the burning cone is not skewed, the state of the burning cone is judged, and specifically includes the following steps:

[0078] Step 1: record the area of the burning cone exceeding the parallel line, denoted as S out , if it does not exceed, S out = 0; the parallel line is the upper and lower edge line of the cigarette.

[0079] Step 2: the cigarette image is converted from RGB space to HSV space by using a color channel conversion algorithm, the gray feature map of the image is calculated, the foreground target is extracted, the filter algorithm and the adaptive threshold algorithm are used to eliminate the tipping paper part, and the burning cone partial area image is obtained.

[0080] Step 3: the contour of the burning cone is extracted by using a contour extraction algorithm, and the peak area S of the burning cone is calculated.

[0081] Step 4: the pixel information of the burning cone partial image is traversed, the gray gradient information is calculated, and the position points of the top of the burning cone, the middle points of the left and right side edges of the burning cone and the bottom edge points are found out.

[0082] Step 5: the acute angle between the connecting line of the top and the middle points of the two side edges and the horizontal line is calculated, denoted as the deviation angle α1 and the deviation angle α2 of the burning cone.

[0083] Step 6: the width of the connecting line of the two side edge points is calculated, denoted as the half peak width W of the burning cone.

[0084] Step 7: Calculate the height from the vertex to the bottom edge point, which is recorded as the peak height H of the combustion cone. c , calculate the length of the cigarette as L c ;

[0085] Step 8: Combined with the combustion cone temperature T information, make the following judgment:

[0086] (1) When T≤set threshold, (L S —2)≤Lc≤(L S +2), indicating that the combustion cone has no temperature and the cigarette length has not changed, indicating that the current combustion state is that the cigarette is not ignited;

[0087] (2) When T> set threshold, S out ≤ set threshold, n≤H c / H s ≤m, indicating that the current burning state is that the burning cone has not fallen and the cigarette paper is turned outward;

[0088] (3) When T> set threshold, L c <(L S —2), H c / H s <n and half-peak width W / D>x,n <x<m,说明卷烟燃烧锥长度突然变短,且半峰宽与燃烧锥直径基本一致,表明当前燃烧状态为燃烧锥完全掉落,卷烟纸空头燃烧;

[0089] (4) When T> set threshold, H c / H s >m, indicating that the length of the combustion cone suddenly becomes longer, indicating that the current combustion state is that the combustion cone is not skewed, but brings out yellow tobacco; c It is the measured length after the cigarette support is struck.

[0090] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for determining the burning state of a cigarette after being subjected to force, characterized in that: Assume that the original length of the cigarette is L S 、The length of the combustion cone is H s , the cigarette diameter is D; first, tap the cigarette to make it show a complete combustion cone shape; then use the image algorithm to determine whether the combustion cone is skewed. If the combustion cone is skewed and the excess area is greater than the set threshold, it is determined to be a fallen end; if the combustion cone is not skewed, the combustion cone state judgment is entered, which specifically includes the following steps: Step 1: Record the area of ​​the combustion cone beyond the parallel line, denoted as S out If not exceeded, S out =0; the parallel lines are the upper and lower edges of the cigarette; Step 2: Using a color channel conversion algorithm, convert the cigarette image from RGB space to HSV space, calculate the image's grayscale feature map, extract the foreground object, and use a filtering algorithm plus an adaptive threshold algorithm to remove the tipping paper portion to obtain an image of the combustion cone area. Step 3: Use the contour extraction algorithm to extract the combustion cone contour and calculate the peak area S of the combustion cone; Step 4: traverse the pixel information of the combustion cone image, calculate the grayscale gradient information, and find the position of the top point of the combustion cone, the middle point of the left and right edges of the combustion cone, and the bottom edge point; Step 5, calculate the acute angles between the line connecting the vertex and the midpoints of the two side edges and the horizontal line, and record them as the deviation angles α1 and α2 of the combustion cone; Step 6: Calculate the width of the line connecting the edge points on both sides, and record it as the half-peak width W of the combustion cone; Step 7: Calculate the height from the vertex to the bottom edge point, which is recorded as the peak height H of the combustion cone. c , calculate the length of the cigarette as L c ; Step 8: Combined with the combustion cone temperature T information, make the following judgment: (1) When T≤set threshold, (L S —2)≤Lc≤(L S +2), indicating that the combustion cone has no temperature and the cigarette length has not changed, indicating that the current combustion state is that the cigarette is not ignited; (2) When T> set threshold, S out ≤ set threshold, n≤H c / H s ≤m, indicating that the current burning state is that the burning cone has not fallen and the cigarette paper is turned outward; (3) When T > set threshold value, L c <(L S —2), H c / H s <n and the full width at half maximum W / D > x, n < x < m, indicating that the length of the cigarette burning cone suddenly becomes shorter, and the full width at half maximum is consistent with the diameter of the burning cone, indicating that the current burning state is that the burning cone has completely fallen off and the cigarette paper with a空头 is burning; (4) When T> set threshold, H c / H s >m, indicating that the length of the combustion cone suddenly becomes longer, indicating that the current combustion state is that the combustion cone is not skewed, but brings out yellow tobacco; c It is the measured length after the cigarette support is struck.

2. The method for judging the burning state of a cigarette after being subjected to stress according to claim 1, characterized in that: Before making a judgment, fix the cigarette in a certain position and hit it with a rated external force.

3. A method for determining the burning state of a cigarette after being subjected to stress according to claim 1 or 2, characterized in that: Images are acquired from the side of the burning cone of the cigarette.

4. The method for judging the burning state of a cigarette after being subjected to stress according to claim 2, characterized in that: A camera and an infrared temperature sensor are set up, wherein the camera is used to obtain an image of the combustion cone, and the infrared temperature sensor is used to detect the temperature of the combustion cone.

5. A system for determining the burning state of a cigarette after being subjected to force, characterized in that: include: The knocking module is used to knock the cigarette to make it show a complete burning cone shape; An image acquisition module, used for acquiring a combustion cone image; A temperature acquisition module is used to obtain the temperature of the combustion cone; The judgment module is used to judge the current state of the combustion cone, which specifically includes the following steps: Assume that the original length of the cigarette is L S 、The length of the combustion cone is H s , the cigarette diameter is D; then, an image algorithm is used to determine whether the combustion cone is skewed. If the combustion cone is skewed and the excess area is greater than a set threshold, it is determined to be a fallen end; if the combustion cone is not skewed, the combustion cone state is determined, which specifically includes the following steps: Step 1: Record the area of ​​the combustion cone beyond the parallel line, denoted as S out If not exceeded, S out =0; the parallel lines are the upper and lower edges of the cigarette; Step 2: Using a color channel conversion algorithm, convert the cigarette image from RGB space to HSV space, calculate the image's grayscale feature map, extract the foreground object, and use a filtering algorithm plus an adaptive threshold algorithm to remove the tipping paper portion to obtain an image of the combustion cone area. Step 3: Use the contour extraction algorithm to extract the combustion cone contour and calculate the peak area S of the combustion cone; Step 4: traverse the pixel information of the combustion cone image, calculate the grayscale gradient information, and find the position of the top point of the combustion cone, the middle point of the left and right edges of the combustion cone, and the bottom edge point; Step 5, calculate the acute angles between the line connecting the vertex and the midpoints of the two side edges and the horizontal line, and record them as the deviation angles α1 and α2 of the combustion cone; Step 6: Calculate the width of the line connecting the edge points on both sides, and record it as the half-peak width W of the combustion cone; Step 7: Calculate the height from the vertex to the bottom edge point, which is recorded as the peak height H of the combustion cone. c , calculate the length of the cigarette as L c ; Step 8: Combined with the combustion cone temperature T information, make the following judgment: (1) When T≤set threshold, (L S —2)≤Lc≤(L S +2), indicating that the combustion cone has no temperature and the cigarette length has not changed, indicating that the current combustion state is that the cigarette is not ignited; (2) When T> set threshold, S out ≤ set threshold, n≤H c / H s ≤m, indicating that the current burning state is that the burning cone has not fallen and the cigarette paper is turned outward; (3) When T > set threshold value, L c <(L S —2), H c / H s <n and the full width at half maximum W / D > x, n < x < m, indicating that the length of the cigarette burning cone suddenly becomes shorter and the full width at half maximum is consistent with the diameter of the burning cone, suggesting that the current burning state is that the burning cone has completely fallen off and the cigarette paper with an air head is burning; (4) When T> set threshold, H c / H s >m, indicating that the length of the combustion cone suddenly becomes longer, indicating that the current combustion state is that the combustion cone is not skewed, but brings out yellow tobacco; c It is the measured length after the cigarette support is struck.

6. The system for determining the burning state of a cigarette after being subjected to stress according to claim 5, characterized in that: Before making a judgment, fix the cigarette in a certain position and hit it with a rated external force.

7. A system for determining the burning state of a cigarette after being subjected to stress according to claim 5 or 6, characterized in that: The image acquisition module acquires an image from the side of the cigarette burning cone.

8. The system for determining the burning state of a cigarette after being subjected to stress according to claim 6, characterized in that: The image acquisition module is a camera mounted on the side of the cigarette.

9. The system for determining the burning state of a cigarette after being subjected to stress according to claim 6, characterized in that: The temperature acquisition module detects the combustion cone temperature through an infrared temperature sensor.

Images