CN107661158B - Method for carrying out digital dental color comparison through multi-view camera - Google Patents
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61C19/00—Dental auxiliary appliances
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Abstract
The invention provides a method for carrying out digital dental color comparison through a multi-view camera, which automatically completes the color comparison work through the steps of lighting, separating gridding, extracting average gray value, positioning coordinates, taking difference, fitting analysis, filtering signals, morphological operation and positioning flaw point color comparison, adopts color image RGB three-color numbers to carry out digital analysis and comparison on the collected image, reflects and compares the sampled colors by the color numbers, and does not depend on the comparison of human eyes any more; the image is subjected to gridding processing and analysis, and digital color representation is carried out in a fine grid, so that the color change of different areas on the tooth can be represented in detail; two symmetrical industrial cameras are adopted for sampling, and two images are compared and compensated, so that the shadow effect generated by the directivity of light is optimized.
Description
Technical Field
The invention relates to the field of dentistry, in particular to a method for carrying out digital dental color comparison through a multi-view camera.
Background
Dental color comparison is an important part in processing and detecting of the implant, color comparison is carried out on the color of the natural tooth before coloring the implant, and the color is detected after the implant is processed. On the other hand, dental color comparison is also an important basis in the aspect of oral diagnosis, and accurate color comparison can improve the basis for patient diagnosis. However, the current dental colorimetric techniques cannot fully restore their color due to the unique personality of natural teeth. The research on the dental colorimetric technology not only ensures that the color of the dental implant is consistent with the color of the real tooth, but also has an important position in the oral health industry.
The utility model with the patent number of 201120434523.9 discloses a multi-zone dental digital colorimeter, which comprises parts such as an optical fiber probe, a colorimetric processing and control unit, a dental multi-zone colorimetric template and the like. The utility model discloses carry out the measurement and the comparison of multizone to the colour of tooth, avoided human factor and to the error of tooth colour evaluation unicity, improved the degree of accuracy that the oral cavity practitioner judged the tooth colour. The utility model discloses a patent No. 2014200720760's utility model discloses a portable LED dentistry standard color comparison light source, this color comparison light source can strictly inject the light wave quality of light source, makes the light wave produce standardly, obtains the uniformity of color comparison external environment. The sunken boat devised a digital photography method in stomatological colorimetry, which photographed Vitapan 3D-Master color plate and natural tooth with a digital camera, measured the photographed photograph using Photoshop, and recorded Lab value. The method can basically reflect the color of the colorimetric plate and provide reference basis for dental colorimetry.
However, the colorimetric techniques of the above methods all use the human eye of the doctor for comparison in the final colorimetric stage, and the degree of digitization is low, which increases the interference factor of human eye errors. The dental colorimetry basically belongs to the colorimetry in the overall range, and details such as color transition on teeth cannot be reflected because no partition is carried out or the number of partitions is too small, so that the coloring process of the dental implant cannot be effectively guided. The above methods all use common picture acquisition, and cannot optimize and process illumination and shadow, nor identify and locate color blemished parts.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method for carrying out digital dental color comparison through a multi-view camera, which adopts a method of carrying out digital analysis and comparison on an acquired image by using RGB (red, green and blue) color numbers of a color image to carry out color comparison on teeth, automatically finishes tooth color comparison work and does not need to manually distinguish colors.
The invention provides a method for carrying out digital dental color comparison through a multi-view camera, which comprises the following steps:
the method comprises the following steps: irradiating an object through a white light source, and acquiring reflected light through a color industrial camera;
step two: three channels of collected images are separated, the three images are respectively meshed, and the position and the size of each mesh are recorded;
step three: sampling each grid in the RGB three-color image by using a cyclic algorithm, and extracting an average gray value in each grid;
step four: positioning world three-dimensional coordinates of each grid by using two photos of a binocular camera and using color information as mark information to obtain coordinates of each grid;
step five: comparing two photos of the binocular camera, comparing the color information of grids of the two photos in the same coordinate system, and taking the difference;
step six: after the color of the image is optimized, searching the data of the mark plate with the matched color number in a database, and performing fitting analysis on the data of the mark plate and the data of the mark plate to obtain a digital color processing result;
step seven: after the color processing result is obtained, filtering out high-frequency signals by using a filter, wherein the rest signals are color areas with abnormity;
step eight: performing morphological operation on the remaining flaw points to obtain accurate flaw points;
step nine: and reading the three-dimensional point signals contained in the color comparison result, accurately positioning the flaw point, and finishing the color comparison operation.
The further improvement lies in that: the average gray scale value in the third step is three numbers of 1-255 to represent color information.
The further improvement lies in that: the difference occurring in said step five is optimized for errors due to non-uniformity of the illumination by means of averaging.
The invention has the beneficial effects that: the collected image is digitally analyzed and compared by adopting a color image RGB (red, green and blue) three-color number, and the sampled color is reflected and compared by using the color number without depending on the comparison of human eyes; the image is subjected to gridding processing and analysis, and digital color representation is carried out in a fine grid, so that the color change of different areas on the tooth can be represented in detail; two symmetrical industrial cameras are adopted for sampling, and two images are compared and compensated, so that the shadow effect generated by the directivity of light is optimized.
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FIG. 1 is a logic diagram of the operation of the present invention.
Detailed Description
For the purpose of enhancing understanding of the present invention, the present invention will be further described in detail with reference to the following examples, which are provided for illustration only and are not to be construed as limiting the scope of the present invention.
The embodiment provides a method for carrying out digital dental color comparison through a multi-view camera, which comprises the following steps: reflected light is obtained by a color industrial camera through irradiation of the object by the white light source. And (4) carrying out three-channel separation on the acquired image, respectively meshing the three pictures, and recording the position and size of each grid. Using a round robin algorithm, each grid in the RGB three-color image is sampled and the average gray value within each grid, i.e., three numbers of 1-255, is extracted to represent the color information.
And positioning the world three-dimensional coordinates of each grid by using the color information as the mark information through two photos of the binocular camera to obtain the coordinates of each grid. Meanwhile, comparing two photos of the binocular camera, comparing the color information of the grids of the two photos in the same coordinate system, taking the difference, and optimizing the error caused by the non-uniformity of illumination through averaging.
After the color of the image is optimized, the data of the sign board with the matched color number is searched in the database, and the data of the sign board are subjected to fitting analysis, so that a digital color processing result is obtained.
After the color processing result is obtained, a filter is used for filtering out high-frequency signals, and the remaining signals are color areas with abnormal appearance. And performing morphological operation on the remaining flaw points to obtain accurate flaw points. The position of the flaw can be accurately positioned by reading the three-dimensional spot signal contained in the flaw detection signal.
Claims (2)
1. A method for carrying out digital dental color comparison through a multi-view camera is characterized by comprising the following steps: the colorimetric method comprises the following steps:
the method comprises the following steps: irradiating an object through a white light source, and acquiring reflected light through a color industrial camera;
step two: three channels of collected images are separated, the three images are respectively meshed, and the position and the size of each mesh are recorded;
step three: sampling each grid in the RGB three-color image by using a cyclic algorithm, and extracting an average gray value in each grid;
step four: positioning world three-dimensional coordinates of each grid by using two photos of a binocular camera and using color information as mark information to obtain coordinates of each grid;
step five: comparing the two photos of the binocular camera, comparing the color information of the grids of the two photos in the same coordinate system, and taking the difference, wherein the difference generated in the fifth step is used for optimizing the error caused by the non-uniformity of illumination through averaging;
step six: after the color of the image is optimized, searching the data of the mark plate with the matched color number in a database, and performing fitting analysis on the data of the mark plate and the data of the mark plate to obtain a digital color processing result;
step seven: after the color processing result is obtained, filtering out high-frequency signals by using a filter, wherein the rest signals are color areas with abnormity;
step eight: performing morphological operation on the remaining flaw points to obtain accurate flaw points;
step nine: and reading the three-dimensional point signals contained in the color comparison result, accurately positioning the flaw point, and finishing the color comparison operation.
2. The method for digital dental colorimetry by a multi-view camera according to claim 1, wherein: the average gray scale value in the third step is three numbers of 1-255 to represent color information.
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| WO2016175234A1 (en) * | 2015-04-27 | 2016-11-03 | ヤンマー株式会社 | Color image processing method, color image processing program, and object recognition method and device |
| WO2016203616A1 (en) * | 2015-06-18 | 2016-12-22 | 日産自動車株式会社 | Traffic light detection device and traffic light detection method |
| CN106600612A (en) * | 2016-12-27 | 2017-04-26 | 重庆大学 | Damage identification and detection method for electric automobile before and after renting |
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| JP2006060377A (en) * | 2004-08-18 | 2006-03-02 | Canon Inc | Color separation table creating method |
| CN102095499A (en) * | 2009-12-09 | 2011-06-15 | 程好学 | Method for automatic color separation of ceramic tiles |
| WO2016175234A1 (en) * | 2015-04-27 | 2016-11-03 | ヤンマー株式会社 | Color image processing method, color image processing program, and object recognition method and device |
| WO2016203616A1 (en) * | 2015-06-18 | 2016-12-22 | 日産自動車株式会社 | Traffic light detection device and traffic light detection method |
| CN105167874A (en) * | 2015-07-23 | 2015-12-23 | 范翌 | Oral digital colorimetric method based on digital photo and HSB (hue-saturation-brightness) color system |
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