1results about How to "Reliable discrimination" patented technology

This invention provides a reliable paper type identification device, a paper type identification method, and a recording medium for identifying recycled paper. The paper type identification device (2) comprises: a first light source unit that illuminates the paper with light having a first wavelength and light having a second wavelength; a detection unit that detects the light from the paper and acquires a detection value based on the light; and a control unit that uses the detection value to derive a determination result of the paper type. The first light source unit and the detection unit are located on the same side relative to the paper. The detection value includes: a first detection value based on the light from the paper when the paper is illuminated with light having the first wavelength; and a second detection value based on the light from the paper when the paper is illuminated with light having the second wavelength. The control unit identifies a first type of recycled paper using a first processing step with the first detection value, and identifies a second type of recycled paper different from the first type using a second processing step with the second detection value.