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:
May. 13, 2025
Filed:
Sep. 09, 2022
Smart Engines Service, Llc, Moscow, RU;
Vladimir Viktorovich Arlazarov, Moscow, RU;
Leisan Ildarovna Koliaskina, Ufa, RU;
Dmitry Petrovich Nikolaev, Moscow, RU;
Dmitry Valerevich Polevoy, Moscow, RU;
Daniil Vyacheslavovich Tropin, Moscow, RU;
Sergey Aleksandrovich Usilin, Moscow, RU;
Smart Engines Service, LLC, Moscow, RU;
Abstract
A method for detecting security holograms on documents in a video stream is disclosed, including: searching for interest points and calculating descriptors in a frame; filtering of interest points in the previous frame so that only points located inside the quadrangle of the outer borders of the document remain; matching the descriptors of interest points of the current and previous frames; application of an algorithm for estimating the parameters of projective transformation between the frames; projective transformation of the quadrangle of the outer boundaries of the document from the previous frame to obtain the outer boundaries of the document in the current frame; document image normalization; calculating the color saturation and hue; updating the saturation and hue values; further considering the pixels of the normalized document image with brightness values not exceeding a preset threshold; filtration of the obtained image.