Newborn foot print collection device and information database construction method based on the Internet of Things

Abstract

The present invention improves and perfects a newborn's palm print collection device and a database construction method, adopts an improved palm print detection film to achieve contact-type palm print collection and archiving of physical materials; ensures the effectiveness of non-contact collection through multiple means such as three-dimensional ranging, visual guidance, and feature object matching; improves collection accuracy by directly comparing a palm print-transferred film obtained during the contact-type palm print collection process with an image obtained during the non-contact palm print collection process; improves efficiency and accuracy by optimizing image processing and feature vector extraction algorithms; contact-type palm print collection and foot 3D molding are used to assist in improving the reliability of palm print collection, and their by-products can be directly archived or kept as a souvenir.

Description

Technical Field

[0001] The present invention relates to the application of the collection, processing and authentication technology of human physiological parameters and identity information in the field of smart medical care of the Internet of Things, and specifically to a newborn foot print collection device and information database construction method based on the Internet of Things. Background Art

[0002] Infants and young children, especially newborns in hospitals, often share similarities in appearance and physique, and lack autonomy and self-expression. In the absence of effective management or in chaotic environments, accidents such as mistaken custody can occur. Furthermore, in today's rapidly developing digital and information-based world, for the sake of social management and personal safety, effective and efficient identification methods for newborns are urgently needed.

[0003] Biometrics refers to computer authentication technology that uses physical or behavioral characteristics to determine the identity of an organism (generally referring to a person). It is a personal authentication technology based on observing behavioral and biological (anatomical and physiological) characteristics.

[0004] Methods of information recognition based on human physiological characteristics include fingerprint recognition, iris recognition, retina recognition, hand geometry recognition, facial recognition, etc. Among them, fingerprint recognition is the most widely used. However, with the continuous advancement of technology, fingerprints are often cracked and forged.

[0005] Footprints have rich feature points and feature values, and are easier to extract for newborns. In view of this, relatively mature footprint collection systems for newborns have been developed. However, the existing technologies have the following problems: First, traditional contact optical collection and recognition systems require a certain amount of force to be applied to the contact surface, which inevitably causes rejection in newborns, and if the pressure applied to the contact surface is too large, it is easy to cause distortion of the footprint morphology; second, non-contact optical collection and recognition systems have high requirements for foot posture, making it difficult to obtain an ideal shooting angle; third, single-means footprint collection systems lack effective auxiliary reference corrections, and the collection accuracy is not high; fourth, the extraction efficiency and accuracy of footprint feature vectors are not high; fifth, as a commemorative and archival item, newborn footprints often require additional operations to obtain and cannot be organically integrated with the footprint collection and recognition process. Summary of the Invention

[0006] The present invention focuses on the above-mentioned deficiencies and provides a newborn foot print collection device and information database construction method based on the Internet of Things.

[0007] The present invention provides a newborn's palm print collection device based on the Internet of Things, including a contact palm print collection device and a non-contact palm print collection device;

[0008] Among them, the contact-type palm print collection device is used to compare data with the non-contact palm print collection device to verify the validity of data collection, and is used to obtain physical materials of palm prints for archiving.

[0009] Preferably, the contact-type sole print collection device has a layered structure, which comprises, from bottom to top, a release cardboard, a first adhesive film layer, a second adhesive film layer, a laminating protective layer, and a cover layer. The adhesion between the laminating protective layer and the second adhesive film layer is greater than the adhesion between the first adhesive film layer and the second adhesive film layer, and the adhesion between the laminating protective layer and the cover layer is greater than the adhesion between the first adhesive film layer and the second adhesive film layer.

[0010] Preferably, the contactless sole print acquisition device includes a tablet smart terminal, which specifically includes a camera unit, an image processing unit, a display unit, a control unit, a storage unit, a communication unit, and a distance measurement unit. The camera unit is used to acquire sole images, and the image processing unit is used to process the acquired sole images and display guidance information for adjusting the foot posture on the display unit. The display unit displays the sole images in equal proportions.

[0011] Preferably, it also includes a foot 3D molding mold for obtaining three-dimensional information of the sole of the foot, and comparing it with the distance data measured by the distance measuring unit when performing the non-contact foot print collection, as a basis for judging whether the sole of the foot is parallel to the display unit.

[0012] Preferably, the foot 3D forming mold includes a box-shaped container, a rubber plate with granular protrusions on the surface is arranged at the bottom of the box-shaped container, and the box-shaped container is filled with oily ink.

[0013] At the same time, the present invention also provides a method for constructing an information database for a newborn's foot print collection device, comprising the following steps:

[0014] S1: Acquire first palm print image data through a contact palm print acquisition device;

[0015] S2: Obtain three-dimensional information of the sole of the foot through a foot 3D molding mold;

[0016] S3: Correcting the foot posture using the three-dimensional information of the sole, and then acquiring the second foot print image data using a non-contact foot print acquisition device;

[0017] S4: displaying the second palm print image data in equal proportion on a display unit of the non-contact palm print acquisition device;

[0018] S5: directly attaching the second adhesive film layer on which the first palm print image data is transferred from the contact palm print collecting device to the display portion of the non-contact palm print collecting device;

[0019] S6: Acquire an overlapping image of the first and second sole print image data;

[0020] S7: Determine whether the similarity between the first and second sole print image data reaches a set threshold. If so, proceed to step S8; if not, return to step S3.

[0021] S8: Extracting a sole print feature vector based on the second sole print image data and storing it in a cloud server.

[0022] Preferably, the above step S1 specifically includes:

[0023] S11: holding the release paperboard of the contact-type palm print collection device with one hand, and pinching the cover layer of the contact-type palm print collection device with the other hand to separate the first adhesive film layer and the second adhesive film layer of the contact-type palm print collection device;

[0024] S12: Apply colored ink evenly on the sole of the foot;

[0025] S13: Aligning the sole of the foot with the designated area of the first adhesive film layer and placing the sole of the foot in close contact with the designated area of the first adhesive film layer to obtain first sole print image data;

[0026] S14: Laminating the second adhesive film layer to the first adhesive film layer again to transfer the first foot print image data formed on the first adhesive film layer to the second adhesive film layer;

[0027] S15: separating the first adhesive film layer from the second adhesive film layer again, and peeling the second adhesive film layer from the protective film of the contact-type foot print collection device;

[0028] S16: Adhere the laminating protective layer to the first adhesive film layer, and peel the cover layer from the laminating protective layer.

[0029] Preferably, the above step S2 specifically includes:

[0030] S21: Melt and mix sheep fat and oily clay, dry in the shade and stir thoroughly to form oily ink, vacuum treat and cut into pieces;

[0031] S22: Filling the cut oil-based ink pad into a box-shaped container with a rubber plate having granular protrusions placed at the bottom;

[0032] S23: Pressing the sole of the foot into the oil-based ink to form a concave portion;

[0033] S24: Filling the concave portion with soft silicone and leaving it for several hours until the soft silicone is dry and hard and then separated from the concave portion to obtain a three-dimensional foot model;

[0034] S25: Obtain three-dimensional information of the sole of the foot according to the three-dimensional model of the foot.

[0035] Preferably, the above step S3 specifically includes:

[0036] S31: Displaying guidance information on the display unit of the non-contact sole print collection device to guide the user to adjust the foot posture. The guidance information may be a seam formed by the connection between any two adjacent toes and the sole of the foot.

[0037] S32: After the foot posture is adjusted to meet the conditions set in the guidance information, the distance from the sole, heel, and proximal phalanx of the big toe to the display unit is measured respectively by the distance measuring unit of the non-contact foot print collection device;

[0038] S33: determining whether the sole of the foot is parallel to the display unit based on the three-dimensional information of the sole of the foot acquired in step S2 and the measurement data of the distance measuring unit in step S32;

[0039] S34: After the foot posture is adjusted to the correct position, the foot image is captured by the camera unit of the non-contact foot print acquisition device;

[0040] S35: Identify the toes and mark the geometric centers of the toes. Connect the geometric centers of any two toes with a line segment. Determine whether the sole of the foot is stretched by comparing the slopes of any line segments.

[0041] S36: Acquire the second sole print image data in the standard posture. The second sole print image data is converted black and white image data, and the texture is sharpened.

[0042] Preferably, the above step S8 specifically includes:

[0043] S81: improving the clarity of the second foot print image data by using a histogram stretching algorithm;

[0044] S82: using the edge detection method based on the Prewitt operator combined with the masking technology to extract the contour line of the second foot print image data;

[0045] S83: remove the miscellaneous lines other than the main sole lines through median filtering;

[0046] S84: Binarize the data to eliminate noise and improve pixel continuity;

[0047] S85: extracting characteristic points of the sole print, such as bifurcation points, truncation points, directions, numbers, and branches, and measuring characteristic values such as position coordinates, thickness, and brightness of these characteristic points;

[0048] S86: Generate and extract a sole print feature vector based on the above feature points and feature values.

[0049] Compared with the existing technology, the present invention has improved and perfected the newborn palm print collection device and database construction method. First, an improved palm print detection film is used to realize the contact collection of palm prints and the archiving of physical materials; second, the effectiveness of non-contact collection is ensured by multiple means such as three-dimensional ranging, visual guidance and feature object matching; third, the collection accuracy is improved by directly comparing the film with the transferred palm print obtained in the contact collection process of the palm print with the image obtained in the non-contact collection process of the palm print; fourth, the efficiency and accuracy are improved by optimizing the image processing and feature vector extraction algorithm; fifth, contact palm print collection and foot 3D molding are used to help improve the reliability of palm print collection, and on the other hand, their by-products can be directly archived or kept as a souvenir. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a structural diagram of the contact-type foot print collection device of the present invention;

[0051] Figure 2 This is a block diagram of the non-contact foot print collection device of the present invention;

[0052] Figure 3 This is a schematic diagram of foot posture judgment according to the present invention;

[0053] Figure 4 This is a flow chart of the method for constructing a foot print information database of the present invention.

[0054] Explanation of the accompanying symbols: contact-type sole print acquisition device 10, non-contact sole print acquisition device 20, release cardboard 101, first adhesive film layer 102, second adhesive film layer 103, laminating protective layer 104, cover layer 105, control unit 201, storage unit 202, display unit 203, image processing unit 204, communication unit 205, camera unit 206, distance measurement unit 207. DETAILED DESCRIPTION

[0055] The techniques described below are susceptible to various modifications and embodiments, and are described in detail herein with reference to specific embodiments in conjunction with the accompanying drawings. However, this is not intended to limit the techniques described below to the specific embodiments. It should be understood that the present invention includes all similar modifications, equivalents, and alternatives that do not depart from the spirit and technical scope of the techniques described below.

[0056] like Figure 1-3As shown, the present invention provides a newborn palm print collection device based on the Internet of Things, including a contact palm print collection device 10 and a non-contact palm print collection device 20;

[0057] The contact-type palm print collection device 10 is used to compare data with the non-contact palm print collection device 20 to verify the validity of data collection, and is used to obtain physical materials of palm prints for archiving.

[0058] Among them, the contact-type sole print collection device has a layered structure, which includes, from bottom to top, a release cardboard 101, a first adhesive film layer 102, a second adhesive film layer 103, a laminating protective layer 104, and a cover layer 105. The adhesion between the laminating protective layer 104 and the second adhesive film layer 103 is greater than the adhesion between the first adhesive film layer 102 and the second adhesive film layer 103, and the adhesion between the laminating protective layer 104 and the cover layer 105 is greater than the adhesion between the first adhesive film layer 102 and the second adhesive film layer 103.

[0059] Furthermore, the release liner 101 has the largest area, with outward-extending edges along all four sides, making it easier to grip when collecting foot prints and secure it to a folder when archiving. The cover layer 105 has the second largest area, with an outward-extending edge on one side for easier gripping when collecting foot prints, and the other side directly attached to the release liner 101. A graphic guide area is provided on the first adhesive film layer 102 to guide the foot into the designated area. The dimensions of the first and second adhesive film layers 102 and 103 are preferably 20 by 26 cm.

[0060] Among them, the non-contact sole print acquisition device 20 includes a tablet smart terminal, which specifically includes a camera unit 206, an image processing unit 204, a display unit 203, a control unit 201, a storage unit 202, a communication unit 205 and a ranging unit 207. The camera unit 206 is used to collect sole images, and the image processing unit 204 is used to process the collected sole images and display guidance information for adjusting the foot posture on the display unit 203. The display unit 203 displays the sole images in proportion.

[0061] The screen size of the display unit 203 is comparable to the size of the first adhesive film layer 102 and the second adhesive film layer 103, preferably 20*26 cm, to display the actual size of the sole of the foot. The guidance information displayed on the display unit 203 is adapted to the graphic guide area of the first adhesive film layer 102.

[0062] It also includes a foot 3D molding mold for obtaining three-dimensional information of the sole of the foot and comparing it with the distance data measured by the distance measuring unit when performing the non-contact foot print collection to serve as a basis for determining whether the sole of the foot is parallel to the display unit.

[0063] The foot 3D forming mold includes a box-shaped container, a rubber plate with granular protrusions on the surface is arranged at the bottom of the box-shaped container, and the box-shaped container is filled with oily ink.

[0064] like Figure 4 As shown, the present invention also provides a method for constructing an information database for a newborn's foot print collection device, comprising the following steps:

[0065] S1: Acquire first palm print image data through the contact palm print acquisition device 10;

[0066] S2: Obtain three-dimensional information of the sole of the foot through a foot 3D molding mold;

[0067] S3: Correcting the foot posture using the three-dimensional information of the sole, and then acquiring second foot print image data using the non-contact foot print acquisition device 20;

[0068] S4: Displaying the second palm print image data in equal proportion on the display unit 203 of the non-contact palm print collecting device 20;

[0069] S5: directly attaching the second adhesive film layer 103 of the contact-type palm print collection device 10 on which the first palm print image data is transferred to the display unit 203 of the non-contact palm print collection device 20;

[0070] S6: Acquire an overlapping image of the first and second sole print image data;

[0071] S7: Determine whether the similarity between the first and second sole print image data reaches a set threshold. If so, proceed to step S8; if not, return to step S3.

[0072] S8: Extracting a sole print feature vector based on the second sole print image data and storing it in a cloud server.

[0073] The above step S1 specifically includes:

[0074] S11: holding the release paperboard 101 of the contact-type palm print collection device 10 with one hand, and pinching the cover layer 105 of the contact-type palm print collection device 10 with the other hand, so that the first adhesive film layer 102 and the second adhesive film layer of the contact-type palm print collection device 10 are separated 103;

[0075] S12: Apply colored ink evenly on the sole of the foot;

[0076] The color here specifically refers to non-black and white colors, such as red, blue, etc., to enhance the contrast with the black and white lines displayed by the display unit 203.

[0077] S13: Align the sole of the foot with the designated area of the first adhesive film layer 102 and keep it in close contact to obtain first sole print image data;

[0078] S14: Laminating the second adhesive film layer 103 to the first adhesive film layer again, so as to transfer the first foot print image data formed on the first adhesive film layer 102 to the second adhesive film layer 103;

[0079] S15: Separating the first adhesive film layer 102 from the second adhesive film layer 103 again, and peeling the second adhesive film layer 103 from the coating protective layer 104 of the contact-type foot print collection device 10;

[0080] S16 : Adhere the laminating protective layer 104 to the first adhesive film layer 102 , and peel off the cover layer 105 from the laminating protective layer 104 .

[0081] The release paperboard 101, the first adhesive film layer 102 and the laminating protective layer 104 are tightly adhered in sequence to serve as a physical file for archiving.

[0082] The above step S2 specifically includes:

[0083] S21: Melt and mix sheep fat and oily clay, dry in the shade and stir thoroughly to form oily ink, vacuum treat and cut into pieces;

[0084] S22: Filling the cut oil-based ink pad into a box-shaped container with a rubber plate having granular protrusions placed at the bottom;

[0085] S23: Pressing the sole of the foot into the oil-based ink to form a concave portion;

[0086] S24: Filling the concave portion with soft silicone and leaving it for several hours until the soft silicone is dry and hard and then separated from the concave portion to obtain a three-dimensional foot model;

[0087] S25: Obtain three-dimensional information of the sole of the foot according to the three-dimensional model of the foot.

[0088] The three-dimensional model of the foot is a three-dimensional and realistic reproduction of the shape and texture of the limbs, which can be preserved as a souvenir.

[0089] The above step S3 specifically includes:

[0090] S31: Displaying guidance information on the display unit 203 of the non-contact sole print collection device 20 to guide the user to adjust the foot posture. The guidance information may be a seam formed by the connection between any two adjacent toes and the sole of the foot.

[0091] Specifically, the guidance information can also be the outline of the foot, or the superposition of the foot outline and the seam formed by the connection between any two adjacent toes and the sole. A newborn's toes are generally tightly fitted together, with almost no gaps between the toes or obvious joints. Therefore, the seam formed by the connection between any two adjacent toes and the sole is used as the guidance mark.

[0092] S32: After the foot posture is adjusted to meet the conditions set in the guidance information, the distance from the sole, heel and proximal phalanx of the big toe to the display unit 203 is measured by the distance measuring unit 207 of the non-contact foot print collection device 20;

[0093] S33: determining whether the sole of the foot is parallel to the display unit based on the three-dimensional information of the sole of the foot acquired in step S2 and the measurement data of the distance measuring unit in step S32;

[0094] When performing non-contact palm print collection, even if the foot has been adjusted according to the guidance information, this only indicates that the projection of the foot on a plane parallel to the display unit meets the capture conditions. In the third dimension perpendicular to this plane, the foot may be tilted forward or backward, causing distortion in the collected palm print. In view of this, the present invention further provides a third-dimensional posture measurement method. By measuring the distance from the sole, heel, and proximal phalanx of the big toe to the display unit, the relative depth of the sole, heel, and proximal phalanx of the big toe can be determined. This multi-point positioning method, combined with the three-dimensional sole information obtained from the foot 3D model, can effectively adjust the foot posture.

[0095] S34: After the foot posture is adjusted to the correct position, the camera unit 206 of the non-contact foot print collection device 20 collects foot images;

[0096] S35: Identify the toes and mark the geometric centers of the toes. Line segment 301 connects the geometric centers of any two toes. By comparing the slopes of any line segments 301, determine whether the sole of the foot is stretched.

[0097] During non-contact foot print collection, even if the foot has been adjusted according to guidance and secondary adjustments have been made using distance measurement and three-dimensional sole information, the possibility of foot print distortion due to partial foot curling cannot be ruled out. Newborns' feet are very sensitive, and some toes, in particular, tend to curl up consciously or unconsciously in response to certain stimuli. This curling can distort the foot print near the trapezius muscle on the sole of the foot, affecting collection accuracy. However, by comparing and analyzing the slope of the line connecting the toes, we can better determine the degree of toe extension and eliminate this effect.

[0098] Furthermore, the region of interest (ROI) can be set and color analysis can be performed on it to further determine the validity of the collected image data. Specifically, the line segment 303 connects the midpoint of the connection between the first toe and the sole and the midpoint of the connection between the fifth toe and the sole. The Euclidean distance of this line segment 303 is taken as L. Translating k*L distance perpendicular to this line segment towards the sole direction, a rectangular area 302 with a length of L and a width of k*L is demarcated. The Cb and Cr values within this rectangular area 302 are measured, and the validity of the collected image data is assisted to be determined by judging the proportion of pixels that meet the corresponding skin color threshold, where 0.05 < k < 0.35, which is a clinical empirical value.

[0099] S36: Obtain the second sole print image data in the standard posture. The second sole print image data is the converted black-and-white image data and has been sharpened for the纹路.

[0100] The black-and-white纹路 displayed by the display unit 203 is used to compare with the color纹路 transferred on the second adhesive film layer 103, which improves the contrast and increases the accuracy of the similarity threshold judgment.

[0101] Among them, the above step S8 specifically includes:

[0102] S81: Improve the clarity of the second sole print image data through the histogram stretching algorithm;

[0103] S82: Use the edge detection method based on the prewitt operator combined with the mask technology to extract the contour line of the second sole print image data;

[0104] S83: Remove the miscellaneous lines other than the main sole print纹路 through median filtering;

[0105] S84: Perform binary processing on the data to eliminate noise and improve pixel continuity;

[0106] S85: Extract the feature points such as the bifurcation points, truncation points, directions, quantities, branches, etc. of the sole print, and measure the feature values such as the position coordinates, thickness, brightness, etc. of these feature points;

[0107] S86: Generate and extract the sole print feature vector based on the above feature points and feature values.

[0108] Although the present invention has been described in detail with general descriptions and specific embodiments above, on the basis of the present invention, some modifications or improvements can be made. The above are only the preferred embodiments of the present invention, and do not limit the scope of the present invention. Other changes and modifications made by those skilled in the art without departing from the spirit and protection scope of the present invention are still included within the protection scope of the present invention.

Claims

1. A newborn palm print collection device based on the Internet of Things, including a contact palm print collection device and a non-contact palm print collection device; It is characterized by: The contact-type palm print collection device is used to compare data with the non-contact palm print collection device to verify the validity of data collection, and is also used to obtain physical materials of palm prints for archiving; The contact-type foot print collection device has a layered structure, comprising, from bottom to top, a release paperboard, a first adhesive film layer, a second adhesive film layer, a laminating protective layer, and a cover layer. The adhesion between the laminating protective layer and the second adhesive film layer is greater than the adhesion between the first adhesive film layer and the second adhesive film layer, and the adhesion between the laminating protective layer and the cover layer is greater than the adhesion between the first adhesive film layer and the second adhesive film layer. The non-contact foot print collection device includes a tablet smart terminal, which specifically includes a camera unit, an image processing unit, a display unit, a control unit, a storage unit, a communication unit, and a distance measurement unit. The camera unit is used to collect foot images, the image processing unit is used to process the foot images and display guidance information for adjusting foot posture on the display unit, and the display unit displays the foot images in equal proportions. It also includes a foot 3D molding mold for obtaining three-dimensional information of the sole of the foot and comparing it with the distance data measured by the distance measuring unit during non-contact foot print collection to serve as a basis for determining whether the sole of the foot is parallel to the display unit; After the foot posture is adjusted to the correct position, the camera unit collects the foot sole image.

2. The newborn's foot print collection device according to claim 1, characterized in that: The foot 3D forming mold includes a box-shaped container, a rubber plate with granular protrusions on the surface is arranged at the bottom of the box-shaped container, and the box-shaped container is filled with oily ink.

3. A method for constructing an information database for the newborn foot print collection device according to any one of claims 1 to 2, characterized in that: The steps include: S1: Acquire first palm print image data through a contact palm print acquisition device; S2: Obtain three-dimensional information of the sole of the foot through a foot 3D molding mold; S3: Correcting the foot posture using the three-dimensional information of the sole, and then acquiring the second foot print image data using a non-contact foot print acquisition device; S4: displaying the second palm print image data in equal proportion on a display unit of the non-contact palm print acquisition device; S5: directly attaching the second adhesive film layer on which the first palm print image data is transferred from the contact palm print collecting device to the display portion of the non-contact palm print collecting device; S6: Acquire an overlapping image of the first and second sole print image data; S7: Determine whether the similarity between the first and second sole print image data reaches a set threshold. If so, proceed to step S8; if not, return to step S3. S8: Extracting a sole print feature vector based on the second sole print image data and storing it in a cloud server.

4. The information database construction method according to claim 3, characterized in that: The above step S1 specifically includes: S11: holding the release paperboard of the contact-type palm print collection device with one hand, and pinching the cover layer of the contact-type palm print collection device with the other hand to separate the first adhesive film layer and the second adhesive film layer of the contact-type palm print collection device; S12: Apply colored ink evenly on the sole of the foot; S13: Aligning the sole of the foot with the designated area of the first adhesive film layer and placing the sole of the foot in close contact with the designated area of the first adhesive film layer to obtain first sole print image data; S14: Laminating the second adhesive film layer to the first adhesive film layer again to transfer the first foot print image data formed on the first adhesive film layer to the second adhesive film layer; S15: separating the first adhesive film layer from the second adhesive film layer again, and peeling the second adhesive film layer from the protective film of the contact-type foot print collection device; S16: Adhere the laminating protective layer to the first adhesive film layer, and peel the cover layer from the laminating protective layer.

5. The information database construction method according to claim 4, characterized in that: The above step S2 specifically includes: S21: Melt and mix sheep fat and oily clay, dry in the shade and stir thoroughly to form oily ink, vacuum treat and cut into pieces; S22: Filling the cut oil-based ink pad into a box-shaped container with a rubber plate having granular protrusions placed at the bottom; S23: Pressing the sole of the foot into the oil-based ink to form a concave portion; S24: Filling the concave portion with soft silicone and leaving it for several hours until the soft silicone is dry and hard and then separated from the concave portion to obtain a three-dimensional foot model; S25: Obtain three-dimensional information of the sole of the foot according to the three-dimensional model of the foot.

6. The information database construction method according to claim 5, characterized in that: The above step S3 specifically includes: S31: Displaying guidance information on a display unit of the non-contact sole print collection device to guide the user in adjusting their foot posture, wherein the guidance information is a seam formed by the connection between any two adjacent toes and the sole of the foot; S32: After the foot posture is adjusted to meet the conditions set in the guidance information, the distance from the sole, heel, and proximal phalanx of the big toe to the display unit is measured respectively by the distance measuring unit of the non-contact foot print collection device; S33: determining whether the sole of the foot is parallel to the display unit based on the three-dimensional information of the sole of the foot acquired in step S2 and the measurement data of the distance measuring unit in step S32; S34: After the foot posture is adjusted to the correct position, the foot image is captured by the camera unit of the non-contact foot print acquisition device; S35: Identify the toes and mark their geometric centers. Draw a line segment connecting the geometric centers of any two toes. Compare the slopes of any line segments to determine whether the sole of the foot is stretched. S36: Acquire the second sole print image data in the standard posture. The second sole print image data is converted black and white image data, and the texture is sharpened.

7. The information database construction method according to claim 6, characterized in that: The above step S8 specifically includes: S81: improving the clarity of the second foot print image data by using a histogram stretching algorithm; S82: using the edge detection method based on the Prewitt operator combined with the masking technology to extract the contour line of the second foot print image data; S83: remove the miscellaneous lines other than the main sole lines through median filtering; S84: Binarize the data to eliminate noise and improve pixel continuity; S85: extracting bifurcation points, truncation points, directions, number, and branches of the sole print as feature points, and measuring the position coordinates, thickness, and brightness of the feature points as feature values; S86: Generate and extract a sole print feature vector based on the above feature points and feature values.

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