A mattress comfort evaluation system, an evaluation method and a mattress optimization method

Abstract

The present invention relates to the technical field of mattress design, and particularly relates to a mattress comfort evaluation system, an evaluation method and a mattress optimization method. The judgment of the comfort of a mattress usually depends on the subjective feelings of users or simple physical indicators. This evaluation method cannot objectively evaluate the comfort of the mattress and has low reliability. The present invention establishes a relationship model between the change rate of body curves at characteristic points and sleep quality, and fits a comfort standard curve according to the boundary conditions of sleep quality, thereby using this as the judgment standard for mattress comfort evaluation. The evaluation system and evaluation method of the present invention are jointly constituted by the combination of software and hardware. At the same time, the evaluation system can also be used to recommend customized mattresses for customers. It meets the complete coverage range and is representative, and has an ideal evaluation effect.

Description

Technical Field

[0001] The present invention relates to the technical field of mattress design and evaluation, and particularly to a mattress comfort evaluation system, an evaluation method and a mattress optimization method. Background Art

[0002] A mattress is a necessary item for sleeping, and its comfort level greatly affects people's rest quality. A comfortable mattress can well relax the muscles of a person's waist, back and hips. Investigation and research show that a considerable part of sleep problems are related to the comfort of the mattress.

[0003] Mattresses on the market include various types, including spring mattresses, latex mattresses, palm mattresses, gel mattresses, etc., and some mattresses also have adjustable functions. However, the judgment of the comfort of a mattress usually depends on the subjective feelings of users. This evaluation method cannot objectively evaluate the comfort of the mattress, resulting in low reliability in the evaluation of the comfort of mattress products.

[0004] In the prior art, there are also methods for evaluating the comfort of a mattress by using body pressure distribution indicators, and there are also differences in the calculation and selection methods of body pressure distribution indicators. The publicly disclosed patent CN106092635A discloses a method for evaluating the pressure comfort of a mattress. These methods are to let the test subject lie on the mattress to be tested, use a body pressure tester to test the body pressure distribution, and perform mathematical processing on the obtained body pressure data to obtain body pressure distribution indicators. These indicators may be different, including maximum pressure, average pressure, maximum pressure gradient, average pressure gradient, etc. The comfort is evaluated through these indicators. Through this method, people can be helped to select a more suitable mattress for themselves, improve the sleep quality, and solve the problem of poor sleep quality caused by uncomfortable mattresses. When the existing methods use body pressure distribution indicators to evaluate the comfort of a mattress, they collect parameters such as pressure and pressure intensity in different regions for comparison, and the consistency between the evaluation results and the actual feelings of users is limited, and the reliability is not very high.

[0005] The most significant and well - studied changes in the body after sleep are the changes in brain waves. When a person is awake during the day, the most common brain waves on a normal electroencephalogram are alpha (α) and beta (β) waves. When a person is sleepy, theta (θ) waves appear. The general trend of brain - wave changes after falling asleep is that the frequency slows down and the amplitude increases. The sleep process of a person is divided into several different stages, mainly including the R&K staging standard and the AASM staging standard. By analyzing the waveform characteristics of physiological signals of the human body such as brain waves, eye waves, and muscle waves collected by PSG, this staging standard is widely used in sleep research. With the progress of science and the rapid development of medical research, the American Academy of Sleep Medicine (AASM) introduced the AASM standard in 2007. This standard divides the sleep process into five stages, unifying the NREMⅢ and IV stages in the R&K standard into stage Ⅲ. Among them, NREMⅠ and NREMⅡ stages belong to the light - sleep stage, and NREMⅢ stage belongs to the deep - sleep stage. Summary of the Invention

[0006] In view of the problems in the above - mentioned background technology, the present invention proposes a mattress comfort evaluation system, an evaluation method, and a mattress optimization method. It establishes a relationship model between the change rate of body curves at characteristic points and sleep quality, fits a comfort standard curve according to the boundary conditions of sleep quality, and thus uses this as the judgment standard for mattress comfort evaluation. The evaluation system and method of the present invention are composed of a combination of software and hardware. At the same time, the evaluation system can also be used to recommend customized mattresses for customers.

[0007] Different mattresses cause different changes in spinal curvature in the side - lying position. The most ideal mattress should be able to maintain the natural shape of the spine. At this time, the mattress matches the human body's shape, can well support all parts of the human body, keep the spinal curve close to the natural state, that is, the horizontal straight - line state, and only then can the muscles be better relaxed.

[0008] On the one hand, the present invention provides a mattress comfort evaluation method, which is applied to an electronic device. This method pre - establishes a comfort model, including the following steps:

[0009] S1. Measure, calculate, and draw the change - rate curve of characteristic points

[0010] S1.1 Measure the positions of characteristic - point coordinate systems of several test subjects in the standing posture. The characteristic points are distributed on the spinal curve and the unilateral lower - limb limbs;

[0011] S1.2 Arrange the test subjects to lie on their sides on different brands and types of mattresses according to the specified posture, and measure the positions of characteristic - point coordinate systems in the same coordinate system;

[0012] S1.3 Calculate the change rate of each test subject's characteristic points in the direction perpendicular to the mattress plane;

[0013] S1.4 Plot the curve of the change rate of characteristic points;

[0014] S2. Analyze sleep physiological parameters

[0015] S2.1 In the living environment, use the mattress in step S1.2, arrange the subjects to sleep on it for several days, and monitor the physiological parameters of the subjects including sleep electroencephalogram;

[0016] S2.2 Judge the deep sleep period and the light sleep period according to the signal characteristics of the sleep electroencephalogram, and record the duration α of the deep sleep period and the duration β of the light sleep period;

[0017] S2.3 Calculate the duration ratio γ:

[0018] γ = α / β;

[0019] S3. Fit the curve of the change rate of characteristic points to obtain a comfort model

[0020] S3.1 Based on the preset duration ratio θ, screen out the duration ratio γ that is greater than or equal to the preset duration ratio θ;

[0021] S3.2 Mathematically fit the curve of the change rate of characteristic points associated with the screened duration ratio γ to obtain a comfort standard curve;

[0022] This method evaluates the comfort of the user using the mattress based on the comfort standard curve in the comfort model, including the following steps:

[0023] S4. Collect and plot the curve of the change rate of characteristic points of the user on the tested mattress according to the process of step S1;

[0024] S5. If the curve of the change rate of characteristic points is within the envelope range of the comfort standard curve, the comfort requirement is met; otherwise, it is not met. For the non - meeting situation, the curve of the change rate of characteristic points closest to the comfort standard curve has the highest relative comfort of the corresponding mattress.

[0025] Advantageously, in step S1.1, a human motion capture system is used to record the spatial position changes of different physiological parts of the human body in different states by setting marker points at characteristic points.

[0026] Advantageously, the specified posture requirement in step S1.2 is to lie on the side with the whole body straightened, look horizontally to the left with the eyes, cross the hands in front of the body, and keep the feet together.

[0027] Advantageously, the origin of the coordinate system is set at the position of the Achilles tendon.

[0028] Advantageously, the preset duration ratio θ in step S3.1 is determined according to clinical experience and can be moderately adjusted according to user feedback.

[0029] Advantageously, the monitored physiological parameters further include one or more of eye movement, electromyogram, electrocardiogram, oronasal airflow, snoring, CPAP or Bi-PAP pressure, chest movement, abdominal movement, leg movement, body position, blood oxygen, pulse rate, pulse waveform, and blood oxygen status, and the deep sleep period and the light sleep period are judged through multiple indicators.

[0030] On the other hand, the present invention also provides a mattress comfort evaluation system, which includes a characteristic point change rate curve drawing module, a sleep physiological parameter analysis module, a comfort model establishment module, and a comfort evaluation module, wherein

[0031] The characteristic point change rate curve drawing module measures the positions of characteristic points in the characteristic point coordinate system of several test subjects in the standing posture, and the characteristic points are distributed on the spinal curve and the unilateral lower limb; the test subjects lie on their sides in a specified posture on different brands and different types of mattresses, and the characteristic point change rate curve drawing module measures the positions of the characteristic points in the same coordinate system; calculates the change rate of each characteristic point of the test subject in the direction perpendicular to the mattress plane; and draws a characteristic point change rate curve based on the change rate value;

[0032] The sleep physiological parameter analysis module uses the same batch of mattresses participating in the test in the living environment, and monitors the physiological parameters of the test subjects including sleep electroencephalogram when the test subjects sleep for multiple days; judges the deep sleep period and the light sleep period according to the signal characteristics of the sleep electroencephalogram, and records the duration α of the deep sleep period and the duration β of the light sleep period; calculates the duration ratio γ:

[0033] γ = α / β;

[0034] The comfort model establishment module filters out the duration ratio γ greater than or equal to the preset duration ratio θ based on the preset duration ratio θ; mathematically fits the characteristic point change rate curve associated with the filtered duration ratio γ to obtain a comfort standard curve;

[0035] The comfort evaluation module receives the characteristic point change rate curve obtained by the characteristic point change rate curve drawing module for the user and the tested mattress, and judges whether the characteristic point change rate curve is within the envelope range of the comfort standard curve. If so, the comfort requirement is met; otherwise, it is not met. For the non-compliant situation, the characteristic point change rate curve closest to the comfort standard curve has the highest relative comfort with the corresponding mattress.

[0036] Advantageously, the characteristic point change rate curve drawing module uses a human motion capture system to record the spatial position changes of different physiological parts of the human body in different states by setting marker points at the characteristic points.

[0037] Advantageously, the specified posture requires lying on the side with the whole body straight, looking horizontally to the left, crossing the hands in front of the body; the feet are together.

[0038] Advantageously, the origin of the coordinate system is set at the position of the Achilles tendon.

[0039] Advantageously, the preset duration ratio θ is determined according to clinical experience and can be moderately adjusted according to user feedback.

[0040] Advantageously, the physiological parameters monitored by the sleep physiological parameter analysis module further include one or more of eye movement, electromyogram, electrocardiogram, oronasal airflow, snoring, CPAP or Bi-PAP pressure, chest movement, abdominal movement, leg movement, body position, blood oxygen, pulse rate, pulse waveform, and blood oxygen status, and the deep sleep period and the light sleep period are judged through multiple indicators.

[0041] On the other hand, the present invention also provides a mattress selection method, which uses the above-mentioned mattress comfort evaluation system to draw and evaluate the characteristic point change rate curves of a user on multiple mattresses, and selects the mattress whose characteristic point change rate curve is within the envelope range of the comfort standard curve as the preferred mattress.

[0042] Beneficial effects: The present invention can scientifically evaluate the comfort of a mattress. By sampling a certain number of test subjects, the range of the test subjects covers all age groups, with a large weight span and no sleep disorders or limb diseases. The coordinate system positions of the characteristic points in the standing posture and the side-lying posture are obtained, and the characteristic point change rate curves are drawn through calculation. Each test subject can obtain a characteristic point change rate curve on each mattress. Therefore, a large number of samples can be obtained through a series of orthogonal tests, meeting the complete coverage range and being representative.

[0043] According to research, sleep physiological parameters largely reflect the sleep state, and the comfort of the mattress has a great impact on sleep quality. The present invention innovatively associates sleep physiological parameters with the characteristic point change rate curve, screens out the characteristic point change rate curves that reflect relatively high sleep quality through reasonable setting of the duration ratio, and fits them to obtain the comfort standard curve in the comfort model. It has been proved by a large number of experiments that it has a relatively ideal evaluation effect.

[0044] Since the physical characteristics of each user are different, the characteristic point change rate curves reflected on different mattresses are different. The most suitable mattress for the user is selected according to the comfort model of the evaluation system of the present invention, which has a customized effect, improves the sleep comfort of the user. After waking up, the body is stretched, the muscles are relaxed, and the mental state is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the characteristic point distribution;

[0046] Figure 2 Schematic diagram for measuring the position of the feature point coordinate system in the standing state;

[0047] Figure 3 Schematic diagram of the side-lying state during testing;

[0048] Figure 4 Feature point curves of a certain subject lying on different mattresses during side-lying testing;

[0049] Figure 5 Functional diagram of the feature point change rate curve drawing module;

[0050] Figure 6 Functional diagram of the sleep physiological parameter analysis module;

[0051] Figure 7 Functional diagram of the comfort model establishment module;

[0052] Figure 8 Functional diagram of the comfort evaluation module;

[0053] Figure 9 Overall flowchart of the evaluation method of the present invention;

[0054] Figure 10 Test result diagram of a certain embodiment. Detailed implementation manners

[0055] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0056] The layout method of the marker points used to characterize the spinal curvature shape and the lower limb shape is as Figure 1 shown, where there are a total of 13 feature points for the spinal curvature shape, see the marker points numbered 1 to 13. The marker point numbered 1 is the occipital fossa feature point, the marker point numbered 3 is the seventh cervical vertebra spinous process feature point, the marker point numbered 6 is the scapula feature point, the marker point numbered 11 is the navel feature point, the marker point numbered 13 is the coccyx feature point, and the other feature points are transitional feature points.

[0057] There are 13 marking points for the lower limb limb shape, see the marking points numbered 13 to 25. The marking point numbered 13 is the caudal vertebra feature point, the marking point numbered 15 is the buttock feature point, the marking point numbered 20 is the knee feature point, and the marking point numbered 25 is the Achilles tendon feature point. The other feature points are transitional feature points.

[0058] In a certain embodiment, in order to avoid the influence of errors and to more intuitively quantify and analyze the supporting effect of different mattresses on the human spine in the side-lying position and the changes in spinal curvature, the main spinal shape feature marking points (a total of 11 feature points from the seventh cervical vertebra spinous process feature point numbered 3 to the caudal vertebra feature point numbered 13) are selected as the research object.

[0059] The marking points are pasted on the feature points on the center line of the trunk and limbs. According to the physiological curvature characteristics of the spine and the human body shape characteristics, the marking points are arranged at key feature parts.

[0060] In Figure 2 shows the measurement state of the feature point coordinate system position in the standing state. Before the test starts, the subject wears tight clothes to ensure the subject's good health and no cervical spine diseases within half a year. In the standing state, Marker marking points are pasted at the feature point positions on the head, neck, lower back and lower limbs of the subject. In order to standardize the standing standard, it is taken as the standard to gently lean the buttocks or shoulders against the anthropometric column. After the subject stands upright for 5 seconds and remains stable, the motion capture test begins.

[0061] Figure 3 In a certain embodiment, when the subject lies on the side on the mattress in the prescribed posture, a certain marking point (here the Achilles tendon point) is selected as the reference plane, and the evaluation results are compared and analyzed. Figure 4 The connection of the feature point coordinate system positions of a certain subject on different mattresses in shows that there are certain differences in the support of different mattresses for different regions of the human body. This difference means that indicators such as the maximum pressure, average pressure, maximum pressure gradient, and average pressure gradient are all different. At present, there is no unified understanding of which of these indicators has the greatest impact on sleep.

[0062] In a certain factual example, the sleep detection instrument used for evaluation is the Compumedics Somté PSG, a mobile polysomnography system. This system can monitor 44-channel polysomnographic physiological signals, including: 8-channel electroencephalogram, 2-channel electrooculogram, 2-channel electromyogram, 1-channel electrocardiogram, 2-channel oronasal airflow (thermal and differential pressure type), 1-channel snoring sound, 1-channel CPAP or Bi-PAP pressure, 1-channel chest movement, 1-channel abdominal movement, 2-channel leg movement, 1-channel body position, 1-channel blood oxygen, 1-channel pulse rate, 1-channel pulse waveform, and blood oxygen status. At the same time, it is equipped with a matching PSG software that can collect the original waveform data of the subjects during the sleep period. Analyzing the waveform data can obtain the sleep stage data, heart rate data, body movement data, and blood oxygen data of the subjects. The characteristics of each sleep stage are shown in Table 1.

[0063] Table 1 Characteristics of Each Sleep Stage

[0064]

[0065] As Figure 5 shown, the feature point change rate curve drawing module of the present invention includes a hardware part and a software part. According to the function, it mainly includes a standing measurement unit, a side-lying measurement unit, a feature point change rate calculation unit, and a feature point change rate drawing unit. Among them, the standing measurement unit completes the measurement of the feature point coordinate system positions of several subjects in the standing posture; the side-lying measurement unit measures the feature point coordinate system positions of the subjects lying on their sides in different brands and types of mattresses according to the specified posture; the feature point change rate calculation unit calculates the change rate of each subject's feature points in the direction perpendicular to the mattress plane; the feature point change rate drawing unit draws the feature point change rate curve based on the change rate value. The equipment used for measurement is not limited to the equipment mentioned in the present invention, and all equipment that can complete the same function is within the protection scope of the present invention.

[0066] As Figure 6 shown, the sleep physiological parameter analysis module of the present invention includes a hardware part and a software part. According to the function, it mainly includes a physiological parameter acquisition unit, a sleep state judgment unit, a sleep duration recording unit, and a duration ratio calculation unit. Among them, the physiological parameter acquisition unit monitors the physiological parameters of the subjects, including sleep electroencephalogram, when using the same batch of mattresses participating in the test in the living environment and the subjects sleep-trial for multiple days; the sleep state judgment unit judges the deep sleep period and the light sleep period according to the signal characteristics of the sleep electroencephalogram; the sleep duration recording unit records the deep sleep duration α and the light sleep duration β; the duration ratio calculation unit calculates the duration ratio γ.

[0067] As Figure 7As shown, the comfort model establishment module mainly includes a duration ratio screening unit, a characteristic point change rate curve screening unit, and a fitting unit. Among them, the duration ratio screening unit screens out a duration ratio γ that is greater than or equal to a preset duration ratio θ based on the preset duration ratio θ; the characteristic point change rate curve screening unit screens the characteristic point change rate curves associated with the screened duration ratio γ; the fitting unit performs mathematical fitting on the screened characteristic point change rate curves to obtain a comfort standard curve.

[0068] As Figure 8 As shown, the comfort evaluation module mainly includes a receiving unit and a judging unit. Among them, the receiving unit receives the characteristic point change rate curve obtained by the characteristic point change rate curve drawing module for the user and the tested mattress, and the judging unit judges whether the characteristic point change rate curve is within the envelope range of the comfort standard curve. If so, the comfort requirement is met; otherwise, it is not met. For the unmet situation, the characteristic point change rate curve closest to the comfort standard curve has the highest relative comfort of the corresponding mattress.

[0069] Figure 9 The evaluation method flow chart shown shows the comfort model establishment stage in the first stage of the present invention and the comfort evaluation stage in the second stage based on this. Among them, the comfort model in the first stage needs to be established based on as many test samples as possible, and the obtained comfort model is more accurate. And the comfort model can be updated with the test results added later. The second stage is a recyclable process when performing comfort evaluation. Each user only needs to execute the process of the second stage for the test on each mattress, without starting from the first stage.

[0070] Figure 10 In the shown embodiment, according to the relationship between the characteristic point change rate curve and the comfort standard curve, it can be known that the characteristic point change rate curve of the user on the AM double-person adjustable mattress is within the envelope range of the comfort standard curve, meeting the preferred requirements. Compared with the comfort standard curve, the test results of several other types of mattresses exceed the comfort standard curve and the curve consistency of some mattresses is poor, so they are not preferred products.

[0071] In a certain embodiment, for several mattresses tested by a user, the obtained characteristic point change rate curves do not meet the standards of the comfort standard curve. In this case, a comfort ranking is obtained by sorting according to the degree of closeness between the characteristic point change rate curve and the comfort standard curve. This degree of closeness can be obtained through mathematical analysis methods or can be analyzed by comprehensively considering the distance between the characteristic points and the standard curve.

[0072] In the process of collecting sleep physiological parameters of the present invention, the number of collections under the same test conditions is increased according to the experimental conditions, and the duration ratio γ is determined by the average value of the deep sleep period and the light sleep period.

[0073] During the acquisition of sleep physiological parameters, the present invention can also combine one or more of eye movement, electromyogram, electrocardiogram, oronasal airflow, snoring, CPAP or Bi-PAP pressure, chest movement, abdominal movement, leg movement, body position, blood oxygen, pulse rate, pulse waveform, and blood oxygen status to determine the deep sleep stage and the light sleep stage through multiple indicators, or perform weighted adjustment on the duration ratio γ obtained from the signal characteristics of sleep electroencephalogram.

[0074] In an embodiment, for a mattress that does not meet the comfort standard curve, a comfortable mattress is preferably selected according to the principle that the characteristic point change rate curve is closest to the comfort standard curve.

[0075] Figure 10 The curves of the illustrated embodiment

[0076] The mattress comfort evaluation method and evaluation system of the present invention consider the overall physiological characteristics of the human body. Compared with the solution that judges based on the physical detection values of individual test points, since the latter's detection often requires combining the subjective feelings of users for grading, the judgment criteria of the present invention are more objective, excluding the defects of inconsistent subjective criteria and the inability to quantify subjective feelings.

[0077] In addition, in each embodiment of the present invention, each functional module can be integrated together to form an independent part, or each module can exist alone, or two or more modules can be integrated to form an independent part.

[0078] If the described function is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present invention.

[0079] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

Claims

1. A method for evaluating the comfort of a mattress, applied to an electronic device, characterized in that: The method pre - establishes a comfort model, including the following steps: S1. Measure, calculate and draw a characteristic point change rate curve S1.1 Measure the positions of characteristic points in the coordinate system of several test subjects in a standing posture, and the characteristic points are distributed on the spinal curve and the unilateral lower limb; S1.2 Arrange the test subjects to lie on their sides on different brands and types of mattresses in a prescribed posture, and measure the positions of the characteristic points in the same coordinate system; S1.3 Calculate the change rate of each characteristic point in the direction perpendicular to the mattress plane for each test subject; S1.4 Draw a characteristic point change rate curve; S2. Analyze sleep physiological parameters S2.1 Use the mattress in step S1.2 in a living environment, arrange the test subjects to sleep for several days, and monitor the physiological parameters of the test subjects including sleep electroencephalogram; S2.2 Judge the deep sleep period and the light sleep period according to the signal characteristics of the sleep electroencephalogram, and record the duration α of the deep sleep period and the duration β of the light sleep period; S2.3 Calculate the duration ratio γ: γ = α / β; S3. Fit the characteristic point change rate curve to obtain a comfort model S3.1 Based on a preset duration ratio θ, screen out the duration ratio γ that is greater than or equal to the preset duration ratio θ; S3.2 Mathematically fit the characteristic point change rate curves associated with the screened - out duration ratio γ to obtain a comfort standard curve; The method evaluates the comfort of the user using the mattress based on the comfort standard curve in the comfort model, including the following steps: S4. Collect and draw the characteristic point change rate curve of the user on the tested mattress according to the process of step S1; S5. If the characteristic point change rate curve is within the envelope range of the comfort standard curve, it meets the comfort requirement; otherwise, it does not meet the requirement. For the non - meeting situation, the characteristic point change rate curve closest to the comfort standard curve has the highest relative comfort of the corresponding mattress.

2. The method for evaluating the comfort of a mattress according to claim 1, characterized in that: In step S1.1, a human motion capture system is used to record the spatial position changes of different physiological parts of the human body in different states by setting marker points at the characteristic points.

3. The method for evaluating the comfort of a mattress according to claim 1, characterized in that: The prescribed posture in step S1.2 requires lying on the side with the whole body straight, looking horizontally to the left, crossing the hands in front of the body, and keeping the feet together.

4. The method for evaluating the comfort of a mattress according to claim 1, characterized in that: The origin of the coordinate system is set at the position of the Achilles tendon.

5. The method for evaluating the comfort of a mattress according to claim 1, characterized in that: The monitored physiological parameters also include one or more of eye movement, electromyogram, electrocardiogram, oral and nasal airflow, snoring, CPAP or Bi - PAP pressure, chest movement, abdominal movement, leg movement, body position, blood oxygen, pulse rate, pulse waveform and blood oxygen status, and the deep sleep period and the light sleep period are judged through multiple indicators.

6. A mattress comfort evaluation system, characterized in that: The evaluation system includes a characteristic point change rate curve drawing module, a sleep physiological parameter analysis module, a comfort model establishment module, and a comfort evaluation module, where the characteristic point change rate curve drawing module measures the positions of characteristic point coordinate systems of several subjects in a standing posture, and the characteristic points are distributed on the spinal curve and one-sided lower limb; the subjects lie on their sides in a specified posture on different brands and types of mattresses, and the characteristic point change rate curve drawing module measures the positions of the characteristic point coordinate systems in the same coordinate system; calculates the change rate of each subject's characteristic point in the direction perpendicular to the mattress plane; and draws a characteristic point change rate curve based on the change rate values; the sleep physiological parameter analysis module uses the same batch of mattresses participating in the test in the living environment, and monitors the physiological parameters of the subjects, including sleep electroencephalogram, when the subjects sleep for multiple days; determines the deep sleep period and the light sleep period according to the signal characteristics of the sleep electroencephalogram, and records the duration α of the deep sleep period and the duration β of the light sleep period; calculates the duration ratio γ: γ = α / β; the comfort model establishment module selects the duration ratio γ that is greater than or equal to the preset duration ratio θ based on the preset duration ratio θ; performs mathematical fitting on the characteristic point change rate curves associated with the selected duration ratio γ to obtain a comfort standard curve; the comfort evaluation module receives the characteristic point change rate curve obtained by the characteristic point change rate curve drawing module for the user and the tested mattress, and determines whether the characteristic point change rate curve is within the envelope range of the comfort standard curve. If so, the comfort requirement is met; otherwise, it is not met. For the non-compliant situation, the characteristic point change rate curve closest to the comfort standard curve has the highest relative comfort of the corresponding mattress.

7. The mattress comfort evaluation system according to claim 6, characterized in that: the characteristic point change rate curve drawing module uses a human motion capture system to record the spatial position changes of different physiological parts of the human body in different states by setting marker points at the characteristic points.

8. The mattress comfort evaluation system according to claim 6, characterized in that: the specified posture requires lying on the side with the whole body straightened, looking horizontally to the left with the eyes, crossing the hands in front of the body; and keeping the feet together.

9. The mattress comfort evaluation system according to claim 6, characterized in that: the physiological parameters monitored by the sleep physiological parameter analysis module further include one or more of eye movement, electromyogram, electrocardiogram, oral and nasal airflow, snoring, CPAP or Bi-PAP pressure, chest movement, abdominal movement, leg movement, body position, blood oxygen, pulse rate, pulse waveform, and blood oxygen status, and determines the deep sleep period and the light sleep period through multiple indicators.

10. A mattress selection method, characterized in that: this method uses the mattress comfort evaluation system according to any one of claims 6-9 to draw and evaluate the characteristic point change rate curves of the user on multiple mattresses, and selects the mattress whose characteristic point change rate curve is within the envelope range of the comfort standard curve as the preferred mattress.

Images