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    • 1. 发明专利
    • System for and method of detecting changes
    • GB2606258A
    • 2022-11-02
    • GB202201349
    • 2022-02-02
    • PREQIN LTD
    • GARY BROUGHTONDHAMODHARAN VAIRAVELDARREN THORPE
    • G06V30/41G06K9/62G06V20/52
    • Method of detecting changes to a webpage, document or image’s content comprising: obtaining a first 310 and second document image 320; determining a portion of the first image that differs from the second image at corresponding locations (312, 322, Figs.10&11); searching for the portion of the first image at different locations in the second image; and defining the portion as a relevant change if the portion is not found in the second image. Images may be scaled to identical dimensions (1002,Fig.8). Masks 300 may be applied to images to avoid consideration of high frequency changes (e.g. dates, times, feeds). Images may be converted to greyscale (1004,Fig.8). Determining differences may involve comparing greyscale pixel patterns to determine local structural similarity index measures (SSIM). Difference measures (SSIMs) may be binarized (1012,Fig.8) and subjected to contour analysis (1014,Fig.8) to determine bounding boxes (1016,Fig.8). Averaging local SSIMs may produce a global difference measure that is compared to a threshold to determine whether further processing is performed (1020-1024,Fig.8). The global threshold is dependent on the image content i.e. images or text. Optical character recognition may be used to determine text location thereby determining whether image differences coincide with the text location to indicate a relevant change.