METHOD FOR DETECTING HOLOGRAPHIC PROTECTION ON DOCUMENTS IN A VIDEO STREAM Russian patent published in 2022 - IPC G06V30/18 G06T7/44 

FIELD: computer technology.

SUBSTANCE: invention relates to the field of computer technology for detecting holographic protection on documents in a video stream. To do this, a method for detecting holographic protection on documents in a video stream is claimed, including: searching for special points and calculating descriptors on the frame; filtering of singular points on the previous frame so that only points located inside the quadrilateral of the external borders of the document remain; comparison of descriptors of singular points of the current and previous frames; application of an algorithm for estimating the parameters of the projective transformation between frames; projective transformation of the quadrilateral of the external borders of the document from the previous frame to obtain the external borders of the document on the current frame; normalization of the document image; calculating saturation and color tone; updating the saturation and color tone statistics, while further pixels of the normalized image of the document are considered, the brightness values of which do not exceed the specified threshold; image filtering is performed.

EFFECT: increase in the reliability of detecting holographic elements by preventing false detection errors on static color elements of the document.

1 cl, 11 dwg