Patent ID: 7812948

Claim:
An apparatus for detecting a different kind of object among objects using a plane spectrometer, comprising a conveyer means for conveying a plurality of objects; an irradiating means for irradiating near-infrared rays to the plurality of objects conveyed by the conveyer means; a plane spectrometer performing plane spectroscopy for a reflected light of near-infrared rays reflected from the plurality of objects, to which the near-infrared rays are irradiated with the irradiating means; an imaging means for converting a plane spectrogram of the reflected light produced through the plane spectrometer into an electric signal by means of a near-infrared ray camera; and an analyzing means for detecting a different kind of object from the plurality of objects using a method of main component analysis upon obtaining spectral data of the reflected light by means of analyzing the electric signal obtained with the imaging means, wherein the analyzing means is configured to perform a wavelength axis averaging processing for averaging spectral data in a direction of the wavelength axis; an interpolation processing for interpolating the spectral data using Lagrangian secondary interpolation; a measuring position optimization processing for detecting a center position of the object by detecting an edge of the object upon accumulating the spectral data in a direction of a spatial axis; a spatial axis averaging processing for obtaining an average value of each wavelength at a plurality of points in a vicinity of the center position of the object detected by the measuring position optimization processing; a differentiation processing for performing a first differentiation or a second differentiation for the spectral data; a main component score calculation processing for calculating the main component score by calculating previously obtained loading vector data and the spectral data obtained from the above-listed processes; and a determination processing for determining whether to be a different kind of object or a same kind of object on a basis of the calculated main component score.