Color measurement with structured light
A method for spatially resolved color determination, comprising the steps of projecting (S 101 ) a first structured-light pattern having a first wavelength of light onto a dental object; detecting (S 102 ) a first spatially resolved optical parameter set based on the reflected or remitted first structured-light pattern; projecting (S 103 ) a second structured-light pattern having a second wavelength of light onto the dental object; detecting (S 104 ) a second spatially resolved optical parameter set based on the reflected or remitted second structured-light pattern; and calculating (S 105 ) a third spatially resolved optical parameter set at a third wavelength of light based on the first and second spatially resolved optical parameter sets.
1 . A method for spatially resolved color determination, comprising
projecting (S 101 ) a first structured-light pattern ( 101 - 1 ) having a first wavelength of light onto a dental object ( 103 );
detecting (S 102 ) a first spatially resolved optical parameter set based on the reflected or remitted first structured-light pattern ( 101 - 1 );
projecting (S 103 ) a second structured-light pattern ( 101 - 2 ) having a second wavelength of light onto the dental object ( 103 );
detecting (S 104 ) a second spatially resolved optical parameter set based on the reflected or remitted second structured-light pattern ( 101 - 2 ); and
calculating (S 105 ) a third spatially resolved optical parameter set at a third wavelength of light based on the first spatially resolved and second spatially resolved optical parameter sets;
wherein a predetermined spectral course is matched to the first spatially resolved and second spatially resolved optical parameter sets to obtain the third spatially resolved optical parameter set; and
wherein the predetermined spectral course is a course of a reflectance, an absorption coefficient and/or a scattering coefficient depending on the wavelength of light.
2 . The method according to claim 1 ,
wherein the third spatially resolved parameter set is determined by a fit process based on the first spatially resolved and second spatially resolved optical parameter sets.
3 . The method according to claim 1 ,
wherein the first spatially resolved optical parameter set and/or second spatially resolved optical parameter set assign(s) one or more optical parameters to the locations on a surface of the dental object ( 103 ), respectively.
4 . The method according to claim 1 ,
wherein the first structured-light pattern ( 101 - 1 ) is generated with a first light source ( 105 - 1 ) and the second structured-light pattern ( 101 - 2 ) is generated with a second light source ( 105 - 2 ).
5 . The method according to claim 1 ,
wherein the method is performed by an intraoral scanner.
6 . A color determination system ( 100 ) for spatially resolved color determination, comprising
a first projector ( 107 ) for projecting a first structured-light pattern ( 101 - 1 ) of a first wavelength of light onto a dental object ( 103 );
a first detector ( 109 ) for detecting (S 102 ) a first spatially resolved optical parameter set based on a reflected or remitted first structured-light pattern ( 101 - 1 );
a second projector ( 107 ) for projecting (S 103 ) a second structured-light pattern ( 101 - 2 ) of a second wavelength of light onto the dental object ( 103 );
a second detector ( 109 ) for detecting (S 104 ) a second spatially resolved optical parameter set based on the reflected or remitted second structured-light pattern ( 101 - 2 ); and
a calculator ( 111 ) for calculating (S 105 ) a third spatially resolved optical parameter set at a third wavelength of light based on the first spatially resolved and second spatially resolved optical parameter sets;
wherein the color determination system ( 100 ) is configured to adjust a predetermined spectral course to the first spatially resolved and second spatially resolved optical parameter sets to obtain the third spatially resolved optical parameter set; and
wherein the predetermined spectral course is a course of a reflectance, an absorption coefficient and/or a scattering coefficient depending on the wavelength of light.
7 . The color determination system ( 100 ) according to claim 6 ,
wherein the color determination system ( 100 ) is configured to extrapolate the third spatially resolved optical parameter set from the first spatially resolved and second spatially resolved optical parameter sets and/or to interpolate the third spatially resolved optical parameter set between the first spatially resolved and second spatially resolved optical parameter sets.
8 . The color determination system ( 100 ) according to claim 6 , comprising
a first light source ( 105 - 1 ) for generating the first structured-light pattern ( 101 - 1 ) and a second light source ( 105 - 1 ) for generating the second structured-light pattern ( 101 - 1 ).
9 . An intraoral scanner with a color determination system ( 100 ) according to claim 6 .
10 . A color determination system ( 100 ) for spatially resolved color determination, comprising
a projector ( 107 ) for projecting a first structured-light pattern ( 101 - 1 ) of a first wavelength of light onto a dental object ( 103 ) and a second structured-light pattern ( 101 - 2 ) of a second wavelength of light onto the dental object ( 103 );
a detector ( 109 ) for detecting (S 102 ) a first spatially resolved optical parameter set based on the reflected or remitted first structured-light pattern ( 101 - 1 ) and a second spatially resolved optical parameter set based on the reflected or remitted second structured-light pattern ( 101 - 2 ); and
a calculator ( 111 ) for calculating (S 105 ) a third spatially resolved optical parameter set at a third wavelength of light based on the first spatially resolved and second spatially resolved optical parameter sets;
wherein the color determination system ( 100 ) is configured to adjust a predetermined spectral course to the first spatially resolved and second spatially resolved optical parameter sets to obtain the third spatially resolved optical parameter set; and
wherein the predetermined spectral course is a course of a reflectance, an absorption coefficient and/or a scattering coefficient depending on the wavelength of light.
11 . The color determination system ( 100 ) according to claim 10 ,
wherein the color determination system ( 100 ) is configured to extrapolate the third spatially resolved optical parameter set from the first spatially resolved and second spatially resolved optical parameter sets and/or to interpolate the third spatially resolved optical parameter set between the first spatially resolved and second spatially resolved optical parameter sets.
12 . The color determination system ( 100 ) according to claim 10 , comprising
a first light source ( 105 - 1 ) for generating the first structured-light pattern ( 101 - 1 ) and a second light source ( 105 - 1 ) for generating the second structured-light pattern ( 101 - 1 ).