US 12,365,008 B2
Optical grain discriminating apparatus
Tomoyuki Miyamoto, Tokyo (JP); Takuya Nishida, Tokyo (JP); Hideaki Ishizu, Tokyo (JP); and Masaaki Sadamaru, Tokyo (JP)
Assigned to SATAKE CORPORATION, Tokyo (JP)
Appl. No. 17/794,195
Filed by SATAKE CORPORATION, Tokyo (JP)
PCT Filed Jan. 22, 2021, PCT No. PCT/JP2021/002322
§ 371(c)(1), (2) Date Jul. 20, 2022,
PCT Pub. No. WO2021/149820, PCT Pub. Date Jul. 29, 2021.
Claims priority of application No. 2020-010374 (JP), filed on Jan. 24, 2020; and application No. 2020-010380 (JP), filed on Jan. 24, 2020.
Prior Publication US 2023/0059349 A1, Feb. 23, 2023
Int. Cl. G01N 21/359 (2014.01); B07C 5/342 (2006.01); G01N 21/3563 (2014.01); G01N 21/84 (2006.01)
CPC B07C 5/342 (2013.01) [G01N 21/3563 (2013.01); G01N 21/359 (2013.01); G01N 2021/8466 (2013.01)] 8 Claims
OG exemplary drawing
 
5. An optical grain discriminating apparatus comprising:
a plurality of light sources and a plurality of cameras for performing an optical inspection on a grain to be transferred; and
at least one processor for discriminating between a good product and a defective product for the grain, based on the optical inspection by the at least one light source and the at least one camera,
wherein the plurality of light sources includes at least: a visible light source for irradiating the grain with visible light; and a near-infrared light source for irradiating the grain with near-infrared light; and the plurality of cameras includes at least: a visible light camera for detecting visible light transmitted through the grain or visible light reflected from the grain; and a near-infrared light camera for detecting near-infrared light transmitted through the grain or near-infrared light reflected from the grain, and
the at least one processor is configured to:
plot wavelength components of red (R), green (G), and blue (B), and a near-infrared light component in a three-dimensional space, to create a three-dimensional optical correlation diagram, for a plurality of good product samples and a plurality of defective product samples, and thereby sets a threshold value, the wavelength components being detected by the visible light camera, and the near-infrared light component being detected by the near-infrared light camera;
plot one of wavelength components of red (R), green (G), and blue (B) light, and a plurality of near-infrared light components in a three-dimensional space, to create a three-dimensional optical correlation diagram, for a plurality of good product samples and a plurality of defective product samples, and thereby sets a threshold value, the wavelength components being detected by the visible light camera, and the near-infrared light components being detected by the near-infrared light camera; and
plot one of wavelength components of red (R), green (G), and blue (B) light, and a plurality of combinations of two near-infrared light components in a three-dimensional space, to create a plurality of types of three-dimensional optical correlation diagrams, for a plurality of good product samples and a plurality of defective product samples, the wavelength components being detected by the visible light camera, each of the combinations of two near-infrared light components including any two of the near-infrared light components, and the near-infrared light components being detected by the near-infrared light camera.