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US 12,501,122 B2Granted
Appearance determination device and appearance determination method
AssigneeSintokogio, Ltd.
InventorYoshinari Nakano
Life of this patent
Estimating the term…
Abstract
An appearance determination device includes at least one processor. The at least one processor carries out a determination step of determining whether an object of determination is conforming or nonconforming, in accordance with a color image and a shape image, the color image being generated by photometric stereo and representing a color optical image of the object of determination, the shape image being generated by the photometric stereo and representing a shape of the object of determination.
Claims9
An appearance determination device comprising
- at least one processor,
- the at least one processor carrying out a determination step of determining whether an object of determination is conforming or nonconforming, in accordance with a normal image generated by photometric stereo and representing a distribution of normal directions on a surface of the object of determination,
- the normal image being generated by the at least one processor carrying out the following steps (1) to (6):
- (1) acquiring a plurality of images of the object of determination irradiated with light emitted from each of a plurality of light sources of respective orientations different from each other, the plurality of images each being taken with use of light containing light of a first wavelength band, light of a second wavelength band, and light of a third wavelength band, wherein the first wavelength band, the second wavelength band, and the third wavelength band are different from each other;
- (2) extracting, from the plurality of images, a plurality of first images corresponding to the first wavelength band, a plurality of second images corresponding to the second wavelength band, and a plurality of third images corresponding to the third wavelength band;
- (3) determining a first distribution of normal directions on the surface of the object of determination, in accordarce with the plurality of first images;
- (4) determining a second distribution of normal directions on the surface of the obiect of determination, in accordance with the plurality of second images;
- (5) determining a third distribution of normal directions on the surface of the object of determination, in accordance with the plurality of third images;
- and
- (6) averaging the normal directions in the first distribution, the second distribution, and the third distribution.
7 more elements
An appearance determination method comprising the steps of:
- inputting a normal image generated by photometric stereo and representing a distribution of normal directions on a surface of an object of determination;
- and
- determining whether the object of determination is conforming or nonconforming, in accordance with the normal image,
- the normal image being generated by carrying out the following steps (1) to (6):
- (1) acquiring a plurality of images of the object of determination irradiated with light emitted from each of a plurality of light sources of respective orientation different from each other, the plurality of images each being taken with use of light containing light of a first wavelength band, light of a second wavelength band, and light of a third wavelength band, wherein the first wavelength band, the second wavelength band, and the third wavelength band are different from each other;
- (2) extracting, from the plurality of images, a plurality of first images corresponding to the first wavelength band, a plurality of second images corresponding to the second wavelength band, and a plurality of third images corresponding to the third wavelength band;
- (3) determining a first distribution of normal direction on the surface of the object of determination, in accordance with the plurality of first images;
- (4) determining a second distribution of normal directions on the surface of the object of determination, in accordance with the plurality of secord images;
- (5) determining a third distribution of normal directions on the surface of the object of determination, in accordance with the plurality of third images;
- and
- (6) averaging the normal directions in the first distribution, the second distribution, and the third distribution.
8 more elements
Dependencies are inferred from the claim text.