Abstract:
The color of a measurement object, such as a vital tooth, and the color of a comparison object to be compared with the measurement object are displayed to a user in an easily comparable manner. The invention provides an image combining apparatus including an image extracting unit for extracting an image of a vital tooth (hereinafter referred to as 'measurement-object image') from a color image of the vital tooth and extracting an image of a shade guide (hereinafter referred to as 'comparison-object image') from a color image of the shade guide, a combining-reference-line setting unit for setting combining reference lines on the measurement-object image and the comparison-object image, a combining unit for combining the measurement-object image and the comparison-object image to form a combined image, and a correction unit for correcting at least one of the measurement-object image and the comparison-object image so as to align their outlines on the combining reference line in the combined image when the outlines are not aligned.
Abstract:
A device for analyzing the apparent colour and the gonioreflectance of an object comprises: a supporting case (13), designed to be positioned in the proximity of a surface of the object to be analyzed; spectrometer means (6,7), mounted within the supporting case (13); optical means (9, 10), arranged within the case of the device, for focusing on the aforesaid spectrometer means (6, 7) both the radiation reflected by a selected area (T) of the surface of the object to be measured (1) and the radiation reflected by the reference surface (11); and means for measuring the gonioreflectance of the selected area (T) of the surface to be analyzed, said means comprising a battery of LEDs (4), each designed to emit a substantially collimated beam of light and send it onto the selected area (T), and a battery of photodetectors (5), each designed to collect a substantially collimated beam of light coming from the selected area (T), each of said LEDs (4) being pre-arranged for being turned on independently of the others; and electronic means (12) for reading and processing the signals at output from said spectrometer means (6, 7) and from said photodetectors (5).
Abstract:
A spectral determination system, comprising a plurality of illuminants; at least one photodetector that detects light originating from the plurality of illuminants and reflected by a target; and a controller that: normalizes a plurality of illuminant sensor outputs obtained from the at least one photodetector, each illuminant sensor output indicating a reflectance value obtained from a target; obtains reference data from a reference database that correlates reference spectra with a corresponding plurality of normalized illuminant sensor outputs, the reference data including data in a neighborhood of each reflectance value; and determines a spectrum Ŝ based on the illuminant sensor outputs and the reference data, wherein the determining step places greater importance on the data in the neighborhood of each reflectance value, wherein the controller performs the determining step based on linear operators, and wherein the linear operators are represented by C i = Z i B i b i = w i + C i Z i T B i + 1 = B i - C i T C i / b i D i + 1 = D i + S i T Z i / w i where w ( i ) represents a weighting function that places greater importance on the data in the neighborhood of each actual reflectance value, S i is an i th reference spectrum in the reference database, and Z i is an i th normalized illuminant sensor output in the reference database, the linear operators being recursively computed until i = N , where N is a number of spectral samples in the reference database.
Abstract translation:的光谱测定系统,包括光源的多元性; 至少一个光电检测器确实检测出光从光源的多元性源自和由目标反射的光; 和控制器,该控制器:标准化来自所述至少一个光检测器获得的发光传感器输出的复数,每个发光体传感器输出指示从目标获得的反射率值; 从参考数据库获得的基准数据相关做与归一化的光源的传感器输出的相应的多个参考光谱,基准数据包含在各反射率值的邻域的数据; 和bestimmt基于所述发光传感器输出和基准数据,worin确定性采矿步骤的地方在每个反射率值附近的数据更大的重要性,一个频谱S worin控制器基于线性算子执行确定性挖掘步骤,和worin线性 运营商正在被C I表示= Z I¢乙IBI =无线+ C I Z I¢¢TB I + 1 = B I - C I¢¢ŤC I / BIð¢I + 1 = D我+ S I T¢Z I /无线其中w(ⅰ)darstellt加权函数确实地更大的重要性在每个实际的反射率值的附近的数据,S i是第参考数据库参考光谱I, 和Z i为第参考数据库中的归一化的光源的传感器输出i,则线性算子被递归地计算直到i = N时,其中N是在参考数据库中的数光谱样品。
Abstract:
Für die Farbmessung von auf einem Aufheller enthaltenden Substrat gedruckten Proben wird in einer ersten Messung ein roher spektralen Reflexionsfaktor der Probe unter Beleuchtung der Probe mit Licht ohne UV-Anteil gemessen. In einer zweiten Messung wird unter Beleuchtung der Probe nur mit UV-Licht ein Fluoreszenzspektrum der Probe gemessen. Das gemessene Fluoreszenzspektrum wird durch Gewichtung mit spektral abhängigen Korrekturfaktoren in ein korrigiertes Fluoreszenzspektrum umgerechnet und schliesslich werden der gemessene rohe spektralen Reflexionsfaktor und das korrigierte Fluoreszenzspektrum zu einem korrigierten spektralen Reflexionsfaktor addiert, aus welchem dann die Farbe der Probe charakterisierende Werte berechnet werden. Die spektralen Korrekturfaktoren werden bei der Geräteherstellung für ein bestimmtes Set von Lichtarten bestimmt und im Gerät gespeichert.
Abstract:
L'invention concerne un dispositif de reconnaissance de la couleur d'un objet permettant d'obtenir une bonne résolution sur l'ensemble du spectre et un résultat reproductible, quel que soit le type de surface, texturée ou non. Selon l'invention, le dispositif comporte une photodiode (13) divisée en trois secteurs distincts ou trois photodiodes, munis chacun de filtres laissant passer seulement l'une des couleurs de base, rouge, verte et bleue, et fournissant trois signaux électriques représentatifs des composantes rouge, verte et bleue de la couleur de l'objet, un amplificateur (16) à gain variable et un microcontrôleur (17) programmé, notamment, pour le commander de manière à ce qu'il applique, à chaque signal provenant de la photodiode (13), une amplification variable, indépendante et automatique.
Abstract:
An image processing system is used for dentistry. Upon creating a false tooth of a patient (59), a plurality of illuminating light of LEDs with different wavelengths emit light and a photographing apparatus (1A) photographs a tooth portion of the patient (59), thereby obtaining image data. The image data is sent to a dentistry filing system (2A) serving as a processing apparatus, and color reproducing data is obtained by calculation. The color reproducing data is sent to a dentistry factory (55) via a public line. Data is searched from a database (56) for calculating a ceramic compounding ratio, compound data of the ceramic false tooth is obtained, matching the color of the tooth portion of the patient (59), and the false tooth approximate to the tooth color of the patient (59) is created.
Abstract:
An LED-based color measurement instrument including an illumination system and a sensing system. The illumination system includes modulated LEDs and a temperature control system for regulating the temperature of the LEDs, thereby improving the consistency of their performance. The sensing system includes a photodiode, a transimpedance amplifier, and an integrator in the first stage to cancel the effect of ambient light on the output of the first stage. The sensing system also includes a lens system for imaging a target area of the target sample onto the photo sensor in a manner so that the product of the target area times the solid angle captured by the lens system is generally uniform over a selected range of distances, thereby reducing the positional sensitivity of the instrument with respect to the target sample.
Abstract:
A system for automatically re-calibrating a spectrophotometer which is mounted on a color printer for measuring colored test patches printed on test sheets moving thereby, and sequentially illuminated with different color illumination sources. Re-calibration is provided by illuminating, with the same sequenced illumination sources, during a time coinciding with an adjacent gap between the printed sheets, a stationary calibration test patch. This re-calibration timing may be provided by the existing sheets positions tracking control system of the printer.