The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 27, 2020
Filed:
Jun. 13, 2018
Nanning Fugui Precision Industrial Co., Ltd., Nanning, CN;
Chia-Ming Yeh, New Taipei, TW;
Rui-Tang Huang, New Taipei, TW;
NANNING FUGUI PRECISION INDUSTRIAL CO., LTD., Nanning, CN;
Abstract
A method for image based authentication of a human computer user as opposed to a robot is applied in a server. The server generates a CAPTCHA image and preprocesses the CAPTCHA image. The CAPTCHA image is preprocessed by halftoning and mapping pixel sparsity onto pre-computed levels by block based operation. The server then encrypts the preprocessed CAPTCHA image into two shared images and transmits same to the client device. The client device renders the two shared images on a display through a user interface to facilitate superimposition of the two shared images and the user can visually decrypt the preprocessed CAPTCHA image and input an authentication code according to the CAPTCHA characters.