Patent ID: 11953447
Assignee: V TECHNOLOGY CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 3:
4. A defective part recognition method comprising the steps of:
obtaining a magnified image of a unit area for recognizing a defective part on a surface of a multi-layer film substrate by irradiating the surface with white incident light;
acquiring, by using a spectral camera having an imaging surface on which the magnified image is formed, spectrum information on the magnified image for each pixel of the imaging surface;
clustering the spectrum information acquired for each pixel by the spectral camera into a cluster set according to a layer structure in the unit area;
generating a histogram with a frequency that is a number of pixels clustered into the cluster, and
comparing a frequency distribution of the generated histogram with a frequency distribution of a histogram free of defects and recognizing the defective part depending on presence of a cluster having a difference in frequency.