CN112790738A - Traditional Chinese medicine tongue coating dryness moistening information analysis device and method based on polarized light - Google Patents
Traditional Chinese medicine tongue coating dryness moistening information analysis device and method based on polarized light Download PDFInfo
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Abstract
A traditional Chinese medicine tongue coating dryness moistening information analysis device and method based on polarized light belong to the field of objective research of traditional Chinese medicine inspection diagnosis. Under fixed lighting conditions, two sets of images were taken in a short time with and without a polarizer. And obtaining a light reflection bright spot area filtered by the polaroid based on the difference between the two groups of images, wherein the pixel number of the area is used as a quantitative reference for moistening the tongue coating. The tongue coating characteristic of moistening and drying is quantified and analyzed mainly according to the bright spots of moisture on the tongue surface image, the bright spots are large when the tongue coating is relatively moist, and the bright spots are almost zero when the tongue coating is dry. However, since the image data of the white fur on the tongue surface is very close to the data of the water bright spots, the accuracy of the analysis is affected. The method is based on the polarization characteristic of moisture reflection, and proposes to adopt a polarizing film to eliminate the moisture reflection, so that after two groups of images including the moisture reflection image and not including the moisture reflection image are obtained, the pixel range of the moisture reflection is determined, and more accurate tongue fur moistening and quantifying analysis is realized.
Description
Technical Field
The invention belongs to the field of objective research of traditional Chinese medicine inspection, and particularly relates to the field of tongue coating dryness moistening quantification in traditional Chinese medicine inspection, which is used for realizing tongue coating dryness moistening quantification and grading and providing quantitative data reference for doctors.
Background
The tongue diagnosis in traditional Chinese medicine is an examination method for understanding the physiological function and pathological changes of human body by observing tongue manifestation changes, and plays an important role in clinical diagnosis in traditional Chinese medicine. The traditional tongue diagnosis method depends on visual observation and language description of traditional Chinese medicine, lacks quantitative description indexes and objective recording means, and brings difficulty to inheritance and popularization of the tongue diagnosis of traditional Chinese medicine. With the development of modern scientific and technical means in the tongue diagnosis of traditional Chinese medicine, the objective and standardized research of tongue diagnosis has become an important development direction of tongue diagnosis of traditional Chinese medicine.
In the processing research of objective tongue color, digital image processing and analysis techniques are generally applied. The analysis of the moistening of the tongue coating, namely the amount of water on the surface of the tongue coating, is mainly based on the statistical analysis of the pixels of the highlight part of the image on the surface of the tongue. However, due to the influence of the white coating on the tongue surface, the high-brightness pixels often include white coating portions with high brightness in addition to the bright spots formed by the moisture on the tongue coating surface, so that the statistical result is inaccurate. The influence of the white coating on the tongue surface on the analysis of the moistening and dryness of the tongue coating is effectively removed, the extraction and the analysis of the bright spots of the water on the tongue coating surface are realized, and the objective necessity is provided for more accurate quantitative analysis of the moistening and dryness of the tongue coating.
Disclosure of Invention
In the theory of traditional Chinese medicine, moistening and dryness of the tongue coating is a characteristic index of tongue manifestation describing the amount of water on the surface of the tongue coating, and reflects the syndrome and constitution of the body together with other tongue manifestation characteristics. In the field of traditional Chinese medicine tongue picture information acquisition and analysis based on digital images, tongue coating dryness moistening analysis can be realized by analyzing the formation of bright spots on the surface moisture of tongue coatings in tongue images. In order to remove the influence of the white coating on the tongue surface, the invention analyzes two groups of images shot under the condition of the existence of the polaroid according to the polarization effect of the mirror reflection and the physical principle that the polaroid can eliminate the mirror reflection, thereby realizing the quantification of tongue coating moistening.
The specific scheme of the invention is designed as follows: under fixed lighting conditions, two sets of images were taken in a short time with and without a polarizer. And obtaining a light reflection bright spot area filtered by the polaroid based on the difference between the two groups of images, wherein the pixel number of the area is used as a quantitative reference for moistening the tongue coating.
The method sequentially comprises the following steps:
1. two sets of images were acquired with and without a polarizer
And under the fixed illumination condition, rapidly shooting the front image of the tongue body by using a digital camera. An electric moving device of a polaroid is designed in front of a lens of the digital camera. The electric device can control the polaroid to move rapidly, so that the polaroid can cover and move away from the lens in a short time and can be synchronously controlled with the camera shutter. Thus taking two sets of tongue front images with the polarizer removed and the polarizer loaded in front of the lens in a short time. The moving speed of the electric device is more than 500 mm/s;
2. calculating the brightness difference between two groups of images
And respectively calculating the brightness matrixes of the two groups of images under the condition of the existence of the polaroid, and subtracting the brightness of the image without the polaroid from the brightness of the image with the polaroid pixel by pixel to obtain a brightness difference gray scale image. Because the polarizer can eliminate reflection, bright spots formed by moisture reflection on the surface of the tongue can be eliminated, the brightness of corresponding pixels is greatly different from that of the situation without the polarizer, and a high-brightness area is formed in a brightness difference gray scale image. While the remaining pixels, which account for the majority, have only a small amplitude luminance decay, presenting a lower luminance value in the luminance difference gray scale map.
3. Determining a reflective bright spot segmentation threshold
And counting to obtain a brightness histogram of the brightness difference gray level image, determining the brightness L1 (corresponding to most pixels in the gray level image) corresponding to the highest peak value of the histogram, determining the brightness L2 corresponding to the second highest peak value of the histogram, and taking the median value between L1 and L2, namely the light-reflecting bright spot segmentation threshold value.
4. Determining the dryness-moistening quantitative value of tongue coating
And counting the number of pixels which are larger than the threshold value in the luminance difference gray scale image, and dividing the number of pixels by the number of pixels in the tongue body range to obtain a tongue fur moistening quantization value.
In order to eliminate the interference of reflecting bright spots caused by shooting angles, the illumination at different angles can be designed, the operations are repeated under different illumination to obtain a plurality of tongue coating dryness moistening quantized values, and the maximum value is taken as a dryness moistening value.
At present, tongue picture information is mainly acquired and analyzed by adopting a mode of shooting a digital image by a camera, and tongue picture characteristic quantitative indexes including tongue color, fur color, cracks, tooth marks, fat and thin and the like are obtained through a digital image processing and analyzing algorithm. The tongue coating characteristic of moistening and drying is quantified and analyzed mainly according to the bright spots of moisture on the tongue surface image, the bright spots are large when the tongue coating is relatively moist, and the bright spots are almost zero when the tongue coating is dry. However, since the image data of the white fur on the tongue surface is very close to the data of the water bright spots (as the red, green and blue channels have higher values), the accuracy of analysis is affected.
The method is based on the polarization characteristic of moisture reflection, and proposes to adopt a polarizing film to eliminate the moisture reflection, so that after two groups of images including the moisture reflection image and not including the moisture reflection image are obtained, the pixel range of the moisture reflection is determined, and more accurate tongue fur moistening and quantifying analysis is realized.
(1) The method is based on the polarization characteristic of moisture reflection, determines the moisture reflection area in the tongue image more pertinently, eliminates the influence of the tongue coating on quantitative analysis, and realizes more accurate tongue coating dryness moistening quantification.
(2) The method takes two images with or without a polarizer, the two images are used for analyzing tongue coating moistening quantity values, and the images with the polarizer can still be used for analyzing other tongue picture characteristics. Because the water reflection is filtered, the tongue quality and the tongue fur characteristics at the corresponding positions can be displayed in the image, and the analysis of the tongue color, the tongue fur putrescence and certain tongue shape characteristics is facilitated.
(3) The method determines the proportion of the pixels of the moisture reflection area on the tongue surface relative to the pixels on the tongue surface as the quantitative value of tongue coating moistening, eliminates the influence of tongue body proportion in images under different acquisition equipment and settings, and can provide a more reasonable moistening characteristic quantity reference for clinic.
By adopting the method, the range of the water reflection bright spots on the surface of the tongue can be determined, the tongue coating dryness moistening value can be obtained, and the recording and comparison of medical record information are convenient. The doctor can make syndrome judgment for the patient according to the traditional Chinese medicine diagnostics by means of the quantity value and combining other tongue picture characteristic indexes and four diagnostic information. On the other hand, the change in the amount during the treatment reflects the change in the degree of dryness of the tongue coating, and can be used as a part of the evaluation index of the therapeutic effect. After the information acquisition reaches a certain scale, the data of tongue coating moistening dryness can be formed, and the tongue coating moistening dryness indexes of any case can be compared under the background to find a reference example, which is beneficial to the inheritance and further development of the traditional Chinese medicine.
The technical scheme of the device is shown in a block diagram 1, and the distribution of components in an image collector is schematically shown in a figure 2. The invention comprises an information collector, a computer 7 for storing and processing shot images, and a display 8 for displaying images, and is characterized in that the information collector mainly comprises a closed case 6, a power supply 3, an image shooting device bracket 11 arranged in the case 6, an image shooting device 4 arranged on the bracket 11, a light source 1 required by image shooting, a jaw bracket 12 for fixing the position of a shot object, a polaroid 2 fixed on the bracket, and an electric sliding table assembly 5 for controlling the movement of the bracket.
In the digital traditional Chinese medicine tongue fur moistening and drying information acquisition device, the chassis with the inner wall blackened by the matte paint is adopted, and the chassis is only provided with a door-shaped opening 9 at the position for placing the image shooting device 4 and the jaw bracket for fixing the tongue image position, namely the target position.
In the above-mentioned digitized apparatus for acquiring tongue coating dryness moistening information in traditional Chinese medicine, the jaw support 12 has a knob 13 capable of adjusting the height.
In the digital traditional Chinese medicine tongue coating dryness moistening information acquisition device, the image shooting device bracket 11 which can finely adjust the position of the image shooting device and has a relatively fixed distance with the lower jaw support 12 is adopted.
In the digital traditional Chinese medicine tongue coating moistening and drying information acquisition device, the polaroid and the bracket 2 are fixed on the electric sliding table 5, and the electric sliding table is driven by the stepping motor to slide on the rail, so that the polaroid fixed on the electric sliding table can transversely move in front of the camera lens.
In the digital device for acquiring tongue coating dryness moistening information in traditional Chinese medicine, the light sources 1 are fixed at four corners of one side of the image pickup device 4 in the cage.
The image shooting device 4 can be a digital camera, and the output port of the digital camera can be connected with the USB serial port of the computer through a transmission cable.
The way for realizing the acquisition of tongue coating dryness moistening information is as follows: the interference of unstable stray light of the external environment is eliminated through the case which is closed as much as possible; a stable and reliable lighting environment is obtained by adopting an international universal standard light source; the head posture of the testee is fixed by adopting the lower jaw support, so that motion blur is avoided, and the testee feels comfortable; the distance between the camera frame and the lower jaw support is relatively fixed, so that the visual field of the photographed tongue image is fixed. The most critical is that: the electric sliding table controlled by a stepping motor is adopted to move the polaroid loaded on the electric sliding table, so that the digital camera can acquire the image of the photographed tongue body when the polaroid is present or absent, and two pictures containing the water reflection on the surface of the tongue coating and filtering the water reflection on the surface of the tongue coating are obtained; by comparing and analyzing the data of the two photos, the tongue fur dryness moistening information can be extracted.
The invention adopts the digital tongue picture shot by the digital camera, and transmits and stores the digital tongue picture to the computer. The data of the photos are analyzed in a computer through an algorithm, so that the quantitative analysis of tongue coating moistening and dryness is realized, and the photos and the analysis effect can be displayed through a display.
Description of the drawings:
FIG. 1: a schematic block diagram of the present invention is shown,
1. the device comprises a light source, a polarizer and a bracket, 3, a power supply, 4, a digital camera, 5, an electric sliding table assembly, 6, a case, 7, a computer, 8 and a display;
FIG. 2: the distribution of the components in the case of the invention is schematically shown,
9. a door-shaped opening 10, a reflecting lampshade 11, an image shooting device bracket 12, a lower jaw support 13 and an adjusting knob;
Detailed Description
The constitution of the present invention can be assembled with reference to fig. 1 and 2, wherein the tongue coating dryness moistening information collecting part is the focus of the present invention. It mainly comprises the following components: the tongue fur moistening information shooting device comprises a case, a lower jaw support, a standard light source, a power socket, a camera frame, a digital camera, a polaroid and support, an electric sliding table assembly and the like, wherein the tongue fur moistening information shooting core component is formed by the electric sliding table, the polaroid and support, the digital camera and the frame.
The inner wall of the case is blackened by non-reflective paint to reduce the reflection interference of the inner wall. Only the camera position and the target position of the case are provided with door-shaped openings with proper sizes, and the other places are closed. The case enables the collection environment to be relatively closed, and interference caused by reflection of other light sources or objects is avoided.
The lighting geometric condition of the light source is 45/0, a reflecting cover made of matt aluminum sheets is arranged on the lamp holder, the two lamp holders are fixed at four corners of one side of the camera in the case, and power is taken from the outside of the case through a power plug.
The image pick-up device can be a Canon EOS series digital camera.
The transmission cable is a USB cable carried by the digital camera. One end of the USB interface is connected with the output port of the digital camera, and the other end of the USB interface is connected with the USB serial port of the computer. The display device may employ a true color display.
The polaroid can be fixed by an optical clamper without film in 0.17mm line. The electric sliding table can adopt a sliding table component with 100mm stroke and 0-600mm/s advancing speed controlled by a single-shaft stepping electric cabinet.
The digital traditional Chinese medicine tongue coating dryness moistening information acquisition device assembled by the parts and the computer meets the designed aim requirement of the invention. And because the tongue fur dryness moistening information analysis algorithm software is configured in the computer, the functions are more complete, the interface is friendly, and the use is convenient.
1. Two sets of images were acquired with and without a polarizer
In the closed image acquisition box, a full-spectrum illumination light source is selected to form a fixed illumination condition. The digital camera is used for shooting the image of the front side of the tongue body. Before a lens of the digital camera, an electric sliding table controlled by a stepping motor is adopted to move a polaroid loaded on the electric sliding table, so that the digital camera can acquire images of a photographed tongue body when the polaroid is present or absent, and two pictures containing tongue coat surface moisture reflection light and filtering the tongue coat surface moisture reflection light are obtained; the polaroid can be fixed by an optical clamper without film in 0.17mm line. The electric sliding table can adopt a sliding table component with 100mm stroke and 0-600mm/s advancing speed controlled by a single-shaft stepping electric cabinet. Thus, the electric device can control the polaroid to move rapidly, so that the polaroid can cover and move away from the lens in a short time and can be controlled synchronously with the shutter of the camera. Thus taking two sets of tongue front images with the polarizer removed and the polarizer loaded in front of the lens in a short time.
2. Calculating the brightness difference between two groups of images
Respectively adopting a general brightness calculation formula: y (luminance) ═ 0.299 × R +0.587 × G +0.114 × B, luminance matrices Y1, Y2 of the two sets of images with and without polarizing plate were calculated (Y1< Y2);
the non-polarizing plate image brightness is subtracted by the polarizing plate image brightness pixel by pixel to obtain a brightness difference gray scale map D, D being Y2-Y1.
3. Determining a reflective bright spot segmentation threshold
And counting to obtain a brightness histogram of the brightness difference gray-scale image D, namely the number of pixels of each brightness value. Because the value of D is high at the position of the moisture reflection bright spot, and the values of other pixels occupying most of the image are low, the histogram can present a double peak shape, and the low brightness peak value is higher. The luminance value with the largest number of pixels is obtained, i.e. the highest peak of the histogram corresponds to the luminance L1. And taking the brightness L2 corresponding to the secondary high peak value of the histogram, and taking the median value between L1 and L2 as the segmentation threshold T of the reflective bright spots.
4. Determining the dryness-moistening quantitative value of tongue coating
Counting the number of pixels P1 which are larger than a threshold value T in the luminance difference gray-scale map;
and separating the tongue body from the image background by adopting a tongue body segmentation algorithm, counting the number of pixels P2 in a tongue body area, and setting the tongue coating moistening and drying quantization value M to be P1/P2.
5. Accuracy of tongue coating dryness moistening
In order to eliminate the interference of light reflection and bright spots possibly brought by the shooting angle, the illumination at different angles can be designed to obtain a plurality of groups of images. For example, the light sources are placed at the four opposite corners of the photographed tongue in the closed space, namely, the upper left light source, the upper right light source, the lower left light source and the lower right light source, the upper two light sources form one group, the lower two light sources form two groups, the operations 1 to 4 are respectively repeated under the two groups of illumination, two tongue coating moistening and drying quantized values M1 and M2 are obtained, and the maximum value is taken as the final precise moistening and drying value.
Claims (3)
1. The traditional Chinese medicine tongue coating dryness moistening information analysis method based on polarized light is characterized by comprising the following steps of:
1) two sets of images were acquired with and without a polarizer
Rapidly shooting the front image of the tongue body by a digital camera under a fixed illumination condition; designing an electric moving device of a polaroid in front of a lens of the digital camera; the electric device controls the polaroid to move quickly, so that the polaroid can cover and move away relative to the lens in a short time, and is synchronously controlled with the camera shutter, and therefore two groups of tongue front images of the polaroid are shot and removed and the polaroid is loaded in front of the lens; the moving speed of the electric device is more than 500 mm/s;
2) calculating the brightness difference between two groups of images
Respectively calculating the brightness matrixes of the two groups of images under the condition of the existence of the polaroids, and subtracting the brightness of the images without the polaroids from the brightness of the images with the polaroids pixel by pixel to obtain a brightness difference gray scale image; because the polarizer can eliminate reflection, bright spots formed by moisture reflection on the surface of the tongue can be eliminated, the difference between the corresponding pixel brightness and the brightness without the polarizer is very large, and a high-brightness area is formed in a brightness difference gray scale image; the rest pixels occupying most parts have small-amplitude brightness attenuation, and a relatively low brightness value is presented in a brightness difference gray scale image;
3) determining a reflective bright spot segmentation threshold
Counting to obtain a brightness histogram of a brightness difference gray scale image, determining the brightness L1 corresponding to the highest peak value of the histogram, determining the brightness L2 corresponding to the second highest peak value of the histogram, and taking the median value between L1 and L2 as the segmentation threshold value of the light-reflecting bright spots;
4) determining the dryness-moistening quantitative value of tongue coating
And counting the number of pixels which are larger than the threshold value in the luminance difference gray scale image, and dividing the number of pixels by the number of pixels in the tongue body range to obtain a tongue fur moistening quantization value.
2. The method of claim 1, wherein:
1) in the closed image acquisition box, a full-spectrum illumination light source is selected to form a fixed illumination condition; shooting a front image of the tongue body by a digital camera; before a lens of the digital camera, an electric sliding table controlled by a stepping motor is adopted to move a polaroid loaded on the electric sliding table, so that the digital camera can acquire images of a photographed tongue body when the polaroid is present or absent, and two pictures containing tongue coat surface moisture reflection light and filtering the tongue coat surface moisture reflection light are obtained; calculating the brightness difference between two groups of images
2) Respectively adopting a general brightness calculation formula: y (luminance) ═ 0.299 × R +0.587 × G +0.114 × B, luminance matrices Y1, Y2 of the two sets of images with and without the polarizing plate were calculated;
subtracting the brightness of the polaroid-free image from the brightness of the polaroid-containing image pixel by pixel to obtain a brightness difference gray scale image D, wherein D is Y2-Y1;
3) determining a reflective bright spot segmentation threshold
Counting to obtain a brightness histogram of the brightness difference gray-scale image D, namely the number of pixels of each brightness value; because the value of D at the moisture reflection bright spot is very high, and the values of other pixels occupying most of the image are very low, the histogram can present a double-peak form, and the low-brightness peak value is higher; taking the brightness value with the largest prime number, namely the brightness L1 corresponding to the highest peak value of the histogram; taking the brightness L2 corresponding to the secondary high peak value of the histogram, and taking the median value between L1 and L2 as the segmentation threshold T of the reflective bright spots;
4) determining the dryness-moistening quantitative value of tongue coating
Counting the number of pixels P1 which are larger than a threshold value T in the luminance difference gray-scale map;
and separating the tongue body from the image background by adopting a tongue body segmentation algorithm, counting the number of pixels P2 in a tongue body area, and setting the tongue coating moistening and drying quantization value M to be P1/P2.
3. Traditional Chinese medicine tongue coating moistening and drying information acquisition device based on polarized light comprises an information acquisition unit, a computer for storing images and a display (8) for displaying images, and is characterized in that the information acquisition unit comprises a closed case (6), a power supply (3), an image shooting device support (11) arranged in the case (6), an image shooting device (4) placed on the support, a light source (1) required for image shooting, a jaw bracket (12) for fixing the position of a shooting object, a polaroid (2) fixed on the support and an electric sliding table assembly (5) for controlling the support to move.
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| CN202110156801.7A CN112790738B (en) | 2021-02-04 | Device and method for analyzing traditional Chinese medicine tongue fur dryness moistening information based on polarized light |
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| CN202110156801.7A CN112790738B (en) | 2021-02-04 | Device and method for analyzing traditional Chinese medicine tongue fur dryness moistening information based on polarized light |
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| CN112790738A true CN112790738A (en) | 2021-05-14 |
| CN112790738B CN112790738B (en) | 2024-07-02 |
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| CN115553731A (en) * | 2022-10-11 | 2023-01-03 | 河南经方云科技有限公司 | Tongue coating dryness moistening information analysis and screening device and using method thereof |
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| CN115553731A (en) * | 2022-10-11 | 2023-01-03 | 河南经方云科技有限公司 | Tongue coating dryness moistening information analysis and screening device and using method thereof |
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