Patent ID: 11907783
Assignee: KAKAOBANK CORP.
Field: Computer technology (Electrical engineering)
Classification: CPC G  B | IPC B  G

Claim 0:
1. A hologram detection method, the hologram detection method comprising:
setting a plurality of detection unit regions located at different positions in a detection object;
obtaining a first image by capturing the detection object in a flash off state;
inputting the first image to a neural network model to obtain a first detection result value representing whether a hologram is detected and a detection region for each of the plurality of detection unit regions;
changing flash intensity in a flash on state;
obtaining a second image by capturing the detection object on the basis of the changed flash intensity;
inputting the second image to the neural network model to obtain a second detection result value representing whether a hologram is detected and a detection region for each of the plurality of detection unit regions;
comparing the detection region of the first detection result value and the second detection result value to determine the authenticity or not of the detection object, and when the detection region where the hologram is detected is different from each other, determining that the detection object is normal,
wherein the neural network model is learned by using a plurality of learning images,
wherein each of the plurality of learning images includes a plurality of regions, where the presence of a hologram has been checked, and each of the plurality of regions includes labeling value representing whether a hologram is present.