公开(公告)号：US20230345014A1

公开(公告)日：2023-10-26

申请号：US18347356

申请日：2023-07-05

Applicant: Dropbox, Inc.

Inventor： Daniel Horn ,  Ken Elkabany ,  Keith Winstein

IPC: H04N19/176 ,  H04N19/625 ,  H04N19/13 ,  H04N19/593 ,  H04N19/91 ,  H04N19/14 ,  H04N19/18 ,  H04N19/48 ,  H04N19/40 ,  H04N19/124

CPC classification number: H04N19/176 ,  H04N19/625 ,  H04N19/13 ,  H04N19/593 ,  H04N19/91 ,  H04N19/14 ,  H04N19/18 ,  H04N19/48 ,  H04N19/40 ,  H04N19/124 ,  H04N19/46

Abstract: Techniques for lossless compression of a digital image using prior image context.

公开(公告)号：US11716476B2

公开(公告)日：2023-08-01

申请号：US17663983

申请日：2022-05-18

Applicant: Dropbox, Inc.

Inventor： Daniel Horn ,  Ken Elkabany ,  Keith Winstein

IPC: G06T9/00 ,  H04N19/176 ,  H04N19/625 ,  H04N19/13 ,  H04N19/593 ,  H04N19/91 ,  H04N19/14 ,  H04N19/18 ,  H04N19/48 ,  H04N19/40 ,  H04N19/124 ,  H04N19/46 ,  H04N19/132 ,  H04N19/42 ,  H04N19/436

CPC classification number: H04N19/176 ,  H04N19/124 ,  H04N19/13 ,  H04N19/14 ,  H04N19/18 ,  H04N19/40 ,  H04N19/48 ,  H04N19/593 ,  H04N19/625 ,  H04N19/91 ,  H04N19/132 ,  H04N19/42 ,  H04N19/436 ,  H04N19/46

Abstract: Techniques for lossless compression of a digital image using prior image context.

公开(公告)号：US10936622B2

公开(公告)日：2021-03-02

申请号：US15867571

申请日：2018-01-10

Applicant: Dropbox, Inc.

Inventor： Nipunn Koorapati ,  Daniel Horn ,  Elmer Charles Jubb, IV

IPC: H04L29/06 ,  G06F16/27 ,  G06F16/11 ,  G06F16/18 ,  G06F16/178 ,  G06F16/176 ,  G06F3/06 ,  G06F21/60 ,  G06F21/62 ,  H04L29/08 ,  G06F16/958 ,  G06F16/2455 ,  G06F16/951 ,  G06F16/172 ,  G06F1/04 ,  G06F9/54 ,  G06F11/14 ,  G06F12/14 ,  G06F21/10 ,  H04L9/32 ,  G06F16/23 ,  G06F16/22 ,  G06F16/182 ,  G06F16/185 ,  G06F16/16 ,  G06F16/13 ,  G06F16/174 ,  G06F16/14 ,  G06F16/907 ,  G06F16/17 ,  G06F16/901 ,  G06F16/955

Abstract: An interface of a content management system manages storage and access of content on the system. For example, after receiving, from a client, a request to download a content item, the interface determines whether the request includes a valid token. If so, the interface sends a content item request to a storage service, retrieves the content item, and sends the content item to the client. Otherwise, the interface sends an authorization request to an authorization service, an authentication request to an authentication service, and a content item request to the storage service. Based on the requests, the interface determines whether the content item is available in storage and whether the client is authorized to access the content item. When the content item is available in storage and the client is authorized to access the content item, the interface retrieves the content item and sends the content item to the client.

公开(公告)号：US20190207929A1

公开(公告)日：2019-07-04

申请号：US15867571

申请日：2018-01-10

Applicant: Dropbox, Inc.

Inventor： Nipunn Koorapati ,  Daniel Horn ,  Elmer Charles Jubb, IV

IPC: H04L29/06 ,  H04L29/08

CPC classification number: G06F16/137 ,  G06F1/04 ,  G06F3/0629 ,  G06F3/067 ,  G06F9/547 ,  G06F16/11 ,  G06F16/122 ,  G06F16/125 ,  G06F16/128 ,  G06F16/152 ,  G06F16/156 ,  G06F16/172 ,  G06F16/1734 ,  G06F16/1744 ,  G06F16/176 ,  G06F16/1767 ,  G06F16/178 ,  G06F16/1787 ,  G06F16/18 ,  G06F16/182 ,  G06F16/183 ,  G06F16/1844 ,  G06F16/185 ,  G06F16/2246 ,  G06F16/2379 ,  G06F16/24552 ,  G06F16/27 ,  G06F16/275 ,  G06F16/907 ,  G06F16/958 ,  G06F21/6218 ,  G06F2221/2141 ,  H04L9/3213 ,  H04L9/3247 ,  H04L63/10 ,  H04L63/101 ,  H04L67/06 ,  H04L67/1095 ,  H04L67/1097 ,  H04L67/306 ,  H04L67/42

Abstract: An interface of a content management system manages storage and access of content on the system. For example, after receiving, from a client, a request to download a content item, the interface determines whether the request includes a valid token. If so, the interface sends a content item request to a storage service, retrieves the content item, and sends the content item to the client. Otherwise, the interface sends an authorization request to an authorization service, an authentication request to an authentication service, and a content item request to the storage service. Based on the requests, the interface determines whether the content item is available in storage and whether the client is authorized to access the content item. When the content item is available in storage and the client is authorized to access the content item, the interface retrieves the content item and sends the content item to the client.

公开(公告)号：US20190098321A1

公开(公告)日：2019-03-28

申请号：US16205114

申请日：2018-11-29

Applicant: Dropbox, Inc.

Inventor： Daniel Horn ,  Ken Elkabany ,  Keith Winstein

IPC: H04N19/176 ,  H04N19/124 ,  H04N19/14 ,  H04N19/40 ,  H04N19/48 ,  H04N19/18 ,  H04N19/13 ,  H04N19/593 ,  H04N19/91 ,  H04N19/625 ,  H04N19/42 ,  H04N19/436 ,  H04N19/132 ,  H04N19/46

Abstract: Techniques for image recompression. In one implementation, the techniques are implemented to recompress a baseline joint photographic experts group (JPEG) image with compression savings. The techniques replace the Huffman coding of baseline JPEG with an arithmetic coding that uses a sophisticated adaptive probability model. The arithmetic coding techniques avoid global operations such as global sorting that would prevent distributed and multithreaded decompression operations when recovering the original JPEG image from the recompressed image. At the same time, the techniques realize substantial compression savings relative to baseline JPEG, on average 23% compressing savings in some implementations.