公开(公告)号：US20210409793A1

公开(公告)日：2021-12-30

申请号：US17180213

申请日：2021-02-19

Applicant: Roku, Inc.

Inventor： Shashank Merchant ,  Bruce William Randall ,  Brian Johnson ,  Chungwon Seo ,  Seunghyeong Lee ,  Paul Jeffrey Holmquist

IPC: H04N21/234 ,  H04N21/2343 ,  H04N21/84 ,  H04N21/845

Abstract: One high-level aspect of a content-modification system and related methods may involve facilitating content modification by a content-presentation device of received broadcast content in a controlled manner, while under circumstances in which some events that can impact timing may be unpredictable. In particular, certain operations by a content-presentation device may involve matching received content with specific expected content as determined by one or another component of the content-modification system, in order to confirm proper conditions are met for the content-presentation device to proceed with, or continue, content-modification operations. It can happen the matching procedure becomes subject or susceptible to timing irregularities, or jitter. In some instances, jitter may impact the ability to derive the benefits of content modification. Accordingly, example embodiments herein are directed to systems and method for compensation and/or mitigating the effects of jitter.

公开(公告)号：US11036783B2

公开(公告)日：2021-06-15

申请号：US16365577

申请日：2019-03-26

Applicant: Roku, Inc.

Inventor： Prashant Ramanathan ,  Jose Pio Pereira ,  Shashank Merchant ,  Mihailo M. Stojancic

IPC: G06F16/00 ,  G06F16/48 ,  G06F16/41 ,  G06F16/28 ,  G06F16/783 ,  G06F16/951 ,  G06F16/22 ,  G06F16/901 ,  G06K9/00 ,  G06K9/46

Abstract: The overall architecture and details of a scalable video fingerprinting and identification system that is robust with respect to many classes of video distortions is described. In this system, a fingerprint for a piece of multimedia content is composed of a number of compact signatures, along with traversal hash signatures and associated metadata. Numerical descriptors are generated for features found in a multimedia clip, signatures are generated from these descriptors, and a reference signature database is constructed from these signatures. Query signatures are also generated for a query multimedia clip. These query signatures are searched against the reference database using a fast similarity search procedure, to produce a candidate list of matching signatures. This candidate list is further analyzed to find the most likely reference matches. Signature correlation is performed between the likely reference matches and the query clip to improve detection accuracy.