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:
Jul. 21, 2026
Filed:
Apr. 20, 2023
Smart Engines Service, Llc, Moscow, RU;
Nikita Viktorovich Arlazarov, Moscow, RU;
Irina Andreevna Kunina, Aleksandrovsky district, RU;
Dmitrij Valerevich Polevoj, Moscow, RU;
Aleksandr Vasilevich Chujko, Izhevsk, RU;
SMART ENGINES SERVICE, LLC, Moscow, RU;
Abstract
This disclosure relates to verifying the authenticity of images of documents. Embodiments increase the accuracy of determining the falsified area in the image. The method for detecting and localizing a falsified area in JPEG images is to consider, in the RGB color space, an image that was subjected to JPEG compression. The detection of a falsified area is based on a search for inconsistencies in the structure of the DCT coefficients. The DCT coefficients of the image are calculated with the preservation of information about the position of the corresponding 8×8 pixel blocks, and the quantization matrix is estimated by the calculated DCT coefficients, while the image is split into several blocks. The quantization step is estimated for each of the frequencies in each block, the position of the JPEG compression grid is searched, discrepancies between DCT coefficients and the quantization matrix are searched, and falsified areas are localized.