CN103729881A - Tongue body dynamic three-dimensional reconstruction system oriented to tongue inspection in traditional Chinese medicine - Google Patents
Tongue body dynamic three-dimensional reconstruction system oriented to tongue inspection in traditional Chinese medicine Download PDFInfo
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Abstract
The invention provides a tongue body dynamic three-dimensional reconstruction system oriented to tongue inspection in traditional Chinese medicine. According to the tongue body dynamic three-dimensional reconstruction system, dynamic information acquisition and three-dimensional reconstruction of a tongue body can be achieved. The tongue body dynamic three-dimensional reconstruction system comprises a spherical box body, a jaw support, a lifting table, a camera light shield, a face-shaped light shield, a multi-light-source system, an image acquisition system, a synchronous control circuit and a computer, wherein the multi-light-source system is composed of eight LED light sources, eight light source supports and a base, and the image acquisition system is composed of a high-speed camera and an image acquisition card. Openings are formed in the left hemisphere portion of the spherical box body and the right hemisphere portion of the spherical box body respectively, one of the openings is a camera hole used for installation of the image acquisition device, and the other opening is a hole allowing the examined tongue body to extend into. The eight light sources are evenly distributed on the vertical circumference, taking the sphere center as the circle center, of the box body, each light source faces towards the tongue body and irradiates the center of the tongue body, and the direction of each light source can be adjusted. The synchronous control circuit generates two sets of signals, one of the two sets of signals control circulating powering on of the eight light sources, the other set of signals trigger a camera shutter, a frame of image is taken through the camera each time the light sources in one direction are powered on, and synchronous acquisition is completed.
Description
Technical field
The present invention relates to a kind of tongue body dynamic three-dimensional reconstruction system towards Evolution of Tongue Inspection of TCM, can realize the dynamic information collection of tongue body and three-dimensional reconstruction.
Background technology
Lingual diagnosis is one of very important method in tcm diagnosis, traditional Evolution of Tongue Inspection of TCM is generally that doctor is according to the experience of oneself, diagnosis is observed and made to knowledge to patient's tongue body, the subjective know-how with doctor of the diagnostic result of this mode, experience skill, psychological condition while even diagnosing is relevant, is objectively subject to clinic light, the impact of temperature.Examination process adopts traditional visual inspection and text description, there is no corresponding tongue image data logging and analysis, to clinical, teaching, scientific research, has brought inconvenience, has restricted development and the popularization of traditional Chinese medicine.
In recent decades, the research that objectifies of lingual diagnosis is generally paid attention to, and has had significant progress, and the research work of some units to tongue picture instrument, has obtained certain achievement.Yet these researchs are with two-dimentional tongue image as a result of, lack the accurate description to tongue body configuration of surface and details.Therefore, tongue body is carried out to three-dimensional reconstruction, significant for the research that objectifies of lingual diagnosis.
Photometric stereo is a kind of method of three-dimensional reconstruction of body surface being carried out by illumination variation.Its ultimate principle is to keep the position of object to be reconstructed and video camera to immobilize, difference shot object under a plurality of Different Light directions, utilize to take the normal vector that the light intensity that obtains image is calculated body surface, and gauging surface depth value and then obtain the three-dimensional reconstruction figure of object.With respect to the research that the lingual diagnosis based on two dimensional image objectifies at present, three-dimensional tongue picture has increased its surperficial depth information, the features such as expression tongue body form that can be vivid and the depth of crackle are how many, tongue body roughness, lingual papilla size, have improved presence and the realism on tongue picture surface.
The present invention adopts photometric stereo to carry out dynamic three-dimensional reconstruction to tongue body, by high-speed camera and image pick-up card, completes the collection to tongue body multidate information.Two groups of signals that produce by synchronization control circuit, the circulation of controlling light source light with video camera take synchronous.By photometric stereo, rebuild the tongue model obtaining, through dynamic reconstruction algorithm, carry out dynamic three-dimensional display.The method of this dynamic three-dimensional reconstruction more contributes to the analysis that objectifies to tongue body, for differentiation of tcm provides more favourable foundation.
Summary of the invention
The present invention proposes a kind of tongue body dynamic three-dimensional reconstruction system towards Evolution of Tongue Inspection of TCM.This system can realize the dynamic information collection of tongue body and three-dimensional reconstruction.
Tongue body dynamic three-dimensional reconstruction system towards Evolution of Tongue Inspection of TCM comprises a spherical casing, a jaw holder, a lifting table, a shape of face light shield, a camera light shield, a multiple light courcess system, an image capturing system, a synchronous control system and a computing machine; Described multiple light courcess system comprises 8 LED light sources, 8 light source brackets, base and extension rods, and described image capturing system comprises a high-speed camera and an image pick-up card, and high-speed camera capture speed is more than 50FPS; Spherical casing is placed on lifting table by spherical cabinet base, and two holes are only opened in cabinet wall blacking on spherical casing, and one is that another is that tested tongue body puts in hole for the shooting hole of image collecting device is installed; Two holes lay respectively on the two cerebral hemispheres face of spherical casing, and Liang Gekong center in the same horizontal line; In outside, shooting hole, camera light shield is installed, the outside that puts in hole at tested tongue body is provided with shape of face light shield, has a jaw holder in the outside of shape of face light shield; Tongue body is apart from high-speed camera 20-30 centimetre; Image pick-up card inserts in computing machine, by data line, is connected with high-speed camera; Synchronous control system is controlled on the one hand the circulation of light source and is lighted, and is connected for triggering high-speed camera shutter on the other hand with image pick-up card, reaches the object of synchronous shooting.
(1) dynamic information collection of tongue body
Adopt photometric stereo keeping under the changeless situation in position of tongue body to be reconstructed and high-speed camera, under a plurality of Different Light directions, respectively tongue body is taken, utilize the light intensity of image to calculate the normal direction on tongue body surface, and then the depth information that calculates tongue body surface is used for three-dimensional reconstruction.Experiment shows, adopts more image, the more abundant information on the tongue body surface of acquisition, and the precision of reconstruction also can further improve, however too much image can increase the computation complexity of algorithm again.Native system adopts eight light sources, can obtain good reconstruction effect.Eight light source bracket bases are evenly set on the vertical circumference that the centre of sphere of take on casing is the center of circle, every 45 degree, place one.On light source bracket base, be fixed with extension rod, this extension rod adopts the metal hose of flexible sizing to make, the extension rod other end is light source bracket, light source is fixed on light source bracket, the angle of each light source can regulate by extension rod, the light that eight light sources are penetrated concentrates on tongue body central point, and eight light is all to take the same round element of a cone that tongue body central point is summit.Casing can be split by the two cerebral hemispheres, for the parts such as light source to box house, overhauls.
It is airtight darkroom that photometric stereo requires shooting environmental, camera light shield, and shape of face light shield and spherical casing have formed the collection environment of sealing jointly, have stopped that extraneous light enters shooting casing.In addition, in order to obtain the image under single light source direction of illumination, cabinet wall is carried out to blacking processing.
When tongue body stretches out under state of nature, presenting surface is the downward-sloping state of arc, with horizontal direction angle at 40 degree in the scope of 60 degree, size is about 5 * 4 * 2 centimetres.By this feature of tongue body, when tongue body, apart from camera, cross when near, can not collect the whole shape of tongue body, when tongue body, apart from camera, to cross when far away, the image resolution ratio collecting is not enough, is not easy to observe the fine-feature on tongue body surface.According to the focal length value of general high-speed camera, when tongue body is during in the position apart from 20-30 centimetre, video camera dead ahead, can make whole tongue body appear in shooting picture more clearly.High-speed camera frame frequency is higher, the time shutter short, need stronger illumination brightness, regulate aperture to maximal value place, make image obtain enough brightness.
Light source adopts colour temperature 5000-6000 Kelvin, and colour rendering index is at more than 90 light emitting diodes.
State while stretching out due to normal person's tongue body, for dynamically, trembles with the frequency of about 10-20 time per second, and the frequency of trembling of suffering from the tongue body of hyperthyroidism, Cerebrovascular Disease Patients can be higher, is referred to as trembling tongue in the traditional Chinese medical science.For meticulous motion state when capturing tongue body and stretching out, adopt the high-speed camera of frame frequency more than 50FPS, by the mode that external signal triggers, trigger camera shutter.Image pick-up card directly inserts in computer PCI slot, converts simulating signal to digital signal send into computing machine through A/D, for computing machine, processes, stores and transmit.Image pick-up card is equipped with an external signal connecting band, and accessible external signal is to trigger high-speed camera shutter.High-speed camera is connected with image pick-up card by data line.
The circulation of synchronization control circuit based on chip microcontroller light source light with camera take synchronous.By synchronization control circuit, produce two groups of signals, one group is to be the TTL signal of 10 milliseconds in the cycle, this signal low level makes light source igniting, high level extinguishes light source, for controlling the circulation of eight light sources, light, another group is to compare the TTL signal of 1 millisecond of in phase place time delay with this signal, and its negative edge triggers camera shutter.After each light source starts to light 1 millisecond, video camera is taken a two field picture, completes synchronous acquisition.
(2) dynamic three-dimensional reconstruction of tongue body
For the motion frequency of tongue body, it is 100FPS that video camera frame frequency is set, and shooting time is 4 seconds.To taking 400 two field pictures that obtain, the first eight frame is one group of taking-up, and image afterwards takes out eight frames every eight frames, obtains 25 groups of images altogether.To each group image, by photometric stereo algorithm, calculate the normal direction information on tongue body surface, and then calculate tongue body case depth information.Utilize depth information to reconstruct three-dimensional tongue model.
.X file is the model that provides of DirectX and the storage format of animation data, and it has stored the information such as apex coordinate, color, normal vector, texture coordinate and animation frame of three-dimensional model.Respectively the information of these 25 groups of three-dimensional models is saved as to .X file.
Because tongue body is flexible article, stretch out the summit of each on tongue body in state and, in motion, so adopt the method for key frame gradual change animation by changing the position on summit, tongue body is carried out to dynamic three-dimensional reconstruction, based on DirectX, show.The .X file that loads the tongue body of preserving carries out to summit the intermediate frame that linear interpolation obtains any time between adjacent key frame, adds texture mapping and illumination, forms continuous animation and plays up output.
Accompanying drawing explanation
Fig. 1 is the tongue body dynamic three-dimensional reconstruction entire system structural representation towards Evolution of Tongue Inspection of TCM
Fig. 2 is light source bracket structural representation
Fig. 3 is key frame gradual change animation schematic diagram
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is the tongue body dynamic three-dimensional reconstruction entire system structural representation towards Evolution of Tongue Inspection of TCM.As shown in Figure 1, the present embodiment main body adopts spherical structure, comprises spherical casing 1, jaw holder 3, lifting table 10, camera light shield 8, shape of face light shield 2, multiple light courcess system, image capturing system, synchronous control system and computing machine; Described multiple light courcess system is comprised of eight LED light sources 6, eight light source brackets and base 5; Described image capturing system is comprised of a high-speed camera, an image pick-up card; Spherical casing 1 is placed on lifting table 10 by spherical cabinet base 4.At the left hemisphere centre of sphere place of spherical casing, open a shooting hole 7, shooting hole is slightly larger than high-speed camera Lens, for video camera is installed.Outside, shooting hole is provided with camera light shield 8.Also there is perforate at right hemisphere centre of sphere place on shooting opposite, hole, and this hole is used for stretching into tongue body, is called tongue body and puts in hole, 9, two, hole in the same horizontal line.The position of calibration high-speed camera, makes high-speed camera apart from tongue body 20-30 centimetre, and now tongue body appears in display screen clearly, regulates aperture to maximal value place, makes image have enough brightness.
Fig. 2 is light source bracket structural representation, eight light source bracket bases 11 are evenly set on the vertical circumference that the centre of sphere of take on casing is the center of circle, every 45 degree, place one, on light source bracket, have extension rod 12, adopt the metal hose of flexible sizing to make, can regulate direction by 360 degree.This extension rod is fixed on bracket base 11 by knob 1.The other end of extension rod 12 is light source brackets 14, light source 15 is fixed on light source bracket 14, the angle of each light source 15 can regulate by extension rod 12, the light that eight light sources are penetrated concentrates on tongue body central point, and eight light is all to take the same round element of a cone that tongue body central point is summit.
Image pick-up card is inserted in computing machine, by data line, be connected with high-speed camera.Eight light sources access respectively eight control ends of synchronization control circuit plate.In single-chip microcomputer control program, it is high level that eight groups of light source original states are set, state goes out, the timer function of employing single-chip microcomputer arranges every 10 milliseconds and enters Interruption one time in program, often enter once and interrupt, the state of current light source is set to low level, eight groups of circulations, can realize lighting successively of light source, the time of each light source igniting is 5 milliseconds.On the other hand, by this low and high level signal, the time delay of 1 millisecond is set, in the output of single-chip processor i/o mouth, has so far just obtained than the TTL signal of 1 millisecond of the level time delay of control light source.This TTL signal is received to the input end of image pick-up card external signal connecting band, for triggering the shutter of high-speed camera.By the known 1 millisecond of place after each light source igniting of sequential relationship of these two groups of signals, high-speed camera shutter is triggered, and has realized synchronous shooting.The parameters such as frame frequency, shutter mode, time shutter and gain of high-speed camera in arranging interface, high-speed camera parameter are set.The state stretching out due to tongue body moves, for the meticulous state that captures tongue body motion, it is 100FPS that high-speed camera frame frequency is set, shooting time is 4 seconds, after setting completes, utilize high-speed camera to control software and arrange taking interface, it is external trigger that high-speed camera triggering mode is set, and output image size is 640*480.
Start to take pictures and preserve view data, to taking 400 two field pictures that obtain, the first eight frame is as one group of taking-up, and image afterwards takes out eight frames every eight frames, obtains 25 groups of images altogether.To each group image, by photometric stereo algorithm, calculate the normal direction information on tongue body surface, and then calculate tongue body case depth information.Utilize depth information to reconstruct three-dimensional tongue body.Respectively the information such as the apex coordinate of these 25 groups three-dimensional tongue bodies, normal vector, texture coordinate are saved as to the form of the .X file model that DirectX supports.
Be written into .X file generated grid model, the dynamic effect of realizing between 25 group models based on DirectX by key frame gradual change animation algorithm shows.Fig. 3 is key frame gradual change animation schematic diagram.Gradual change animation is comprised of a series of gradient mesh models, is recording the reposition on each summit that forms grid in the key frame of animation sequence, by interpolation between adjacent key frame, directly change grid model in the position on each summit realize animation effect.Making first grid model is source grid model, apex coordinate is stored in v1, second grid model is target gridding model, apex coordinate is stored in v2, record moves to the summit of the coordinate of target gridding model from the coordinate of source grid model, by a scale (scope is from 0-1), measure the required time period, scale amount is stored in Scalar.Any scale value between 0-1, just representative summit be placed on source grid model between target gridding model coordinate somewhere.The coordinate of summit during gradual change animation is:
v=v1*(1.0-Scalar)+v2*Scalar，
Scale value computing formula is as follows:
Scalar=Time/Length, wherein, the length that Length is animation; Time is the time of coordinate sampling.
Define an animation, comprised 25 animation key points, the time of each key point and the grid model that now used.According to reproduction time, carry out the intermediate frame that interpolation obtains any time, thereby form continuous animation and play up output.
Claims (6)
1. towards a tongue body dynamic three-dimensional reconstruction system for Evolution of Tongue Inspection of TCM, comprise a spherical casing, a jaw holder, a lifting table, a camera light shield, a shape of face light shield, a multiple light courcess system, an image capturing system, a synchronous control system and a computing machine; Described multiple light courcess system comprises 8 LED light sources, 8 light source brackets, base and extension rods, and described image capturing system comprises a high-speed camera and an image pick-up card, and high-speed camera capture speed is more than 50FPS; Spherical casing is placed on lifting table by spherical cabinet base, only opens two holes on spherical casing, and one is that another is that tested tongue body puts in hole for the shooting hole of image collecting device is installed; Two holes lay respectively on the two cerebral hemispheres face of spherical casing, and Liang Gekong center in the same horizontal line; In outside, shooting hole, camera light shield is installed, the outside that puts in hole at tested tongue body is provided with shape of face light shield, has a jaw holder in the outside of shape of face light shield; Image pick-up card inserts in computing machine, by data line, is connected with high-speed camera; Synchronous control system is controlled on the one hand the circulation of light source and is lighted, and is connected for triggering high-speed camera shutter on the other hand with image pick-up card, reaches the object of synchronous shooting; Eight light sources are evenly distributed on take on the perpendicular that the centre of sphere is the center of circle, every 45 degree, arrange one, light source direction can be carried out 360 degree adjustings by extension rod, the light that eight light sources penetrate concentrates on tongue body central point, and eight light is all to take the same round element of a cone that tongue body central point is summit.
2. the tongue body dynamic three-dimensional reconstruction system towards Evolution of Tongue Inspection of TCM according to claim 1, is characterized in that: extension rod adopts the metal hose of flexible sizing to make.
3. the tongue body dynamic three-dimensional reconstruction system towards Evolution of Tongue Inspection of TCM according to claim 1, is characterized in that: tongue body distance High-speed video camera 20-30 centimetre.
4. the tongue body dynamic three-dimensional reconstruction system towards Evolution of Tongue Inspection of TCM according to claim 1, is characterized in that: for obtaining the image under single direction light illumination, cabinet wall is carried out to blacking processing.
5. the tongue body dynamic three-dimensional reconstruction system towards Evolution of Tongue Inspection of TCM according to claim 1, is characterized in that: synchronous control system produces the synchronous of two groups of signal controlling all directions light source ignitings and high-speed camera shooting by synchronization control circuit.
6. the tongue body dynamic three-dimensional reconstruction system towards Evolution of Tongue Inspection of TCM according to claim 1, is characterized in that: described light source adopts colour temperature 5000-6000 Kelvin, and colour rendering index is at more than 90 light emitting diodes.
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Cited By (8)
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| CN106875468A (en) * | 2015-12-14 | 2017-06-20 | 深圳先进技术研究院 | Three-dimensional reconstruction apparatus and method |
| CN108618784A (en) * | 2018-03-14 | 2018-10-09 | 天津中医药大学 | A kind of tongue diagnosing instrument easy to operation |
| CN109829373A (en) * | 2018-12-26 | 2019-05-31 | 北京康加科技有限公司 | Tongue condition detection system and method |
| CN110200590A (en) * | 2019-06-05 | 2019-09-06 | 天津大学 | A kind of camera beaded support for tongue body three-dimensional reconstruction |
| CN110520902A (en) * | 2017-03-30 | 2019-11-29 | 韩国斯诺有限公司 | To the method and device of image application dynamic effect |
| CN111006615A (en) * | 2019-10-30 | 2020-04-14 | 浙江大学 | Flat surface feature scanning imaging device and method |
| CN114827572A (en) * | 2022-04-25 | 2022-07-29 | 杭州准星医学科技有限公司 | Online three-dimensional imaging system of biological tissue |
| CN115578523A (en) * | 2022-11-21 | 2023-01-06 | 慧医谷中医药科技(天津)股份有限公司 | Tongue three-dimensional modeling method and system for multi-angle image fusion |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106875468A (en) * | 2015-12-14 | 2017-06-20 | 深圳先进技术研究院 | Three-dimensional reconstruction apparatus and method |
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| CN115578523A (en) * | 2022-11-21 | 2023-01-06 | 慧医谷中医药科技(天津)股份有限公司 | Tongue three-dimensional modeling method and system for multi-angle image fusion |
| CN115578523B (en) * | 2022-11-21 | 2023-03-10 | 慧医谷中医药科技(天津)股份有限公司 | Tongue three-dimensional modeling method and system for multi-angle image fusion |
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