公开(公告)号：US20220279193A1

公开(公告)日：2022-09-01

申请号：US17663983

申请日：2022-05-18

Applicant: Dropbox, Inc.

Inventor： Daniel Horn ,  Ken Elkabany ,  Keith Winstein

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

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

公开(公告)号：US11343514B2

公开(公告)日：2022-05-24

申请号：US16914340

申请日：2020-06-27

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

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

公开(公告)号：US20200382797A1

公开(公告)日：2020-12-03

申请号：US16914340

申请日：2020-06-27

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

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

公开(公告)号：US10171820B2

公开(公告)日：2019-01-01

申请号：US15822401

申请日：2017-11-27

Applicant: Dropbox, Inc.

Inventor： Daniel Horn ,  Ken Elkabany ,  Keith Winstein

IPC: G06K9/00 ,  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

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.

公开(公告)号：US09832475B1

公开(公告)日：2017-11-28

申请号：US15614860

申请日：2017-06-06

Applicant: Dropbox, Inc.

Inventor： Daniel Horn ,  Ken Elkabany ,  Keith Winstein

IPC: G06K9/36 ,  H04N19/176 ,  H04N19/625 ,  H04N19/124

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

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.

公开(公告)号：US10701374B2

公开(公告)日：2020-06-30

申请号：US16205114

申请日：2018-11-29

Applicant: Dropbox, Inc.

Inventor： Daniel Horn ,  Ken Elkabany ,  Keith Winstein

IPC: G06K9/00 ,  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

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.

公开(公告)号：US20180146199A1

公开(公告)日：2018-05-24

申请号：US15822401

申请日：2017-11-27

Applicant: Dropbox, Inc.

Inventor： Daniel Horn ,  Ken Elkabany ,  Keith Winstein

IPC: H04N19/176 ,  H04N19/124 ,  H04N19/625

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

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.

公开(公告)号：US09712830B1

公开(公告)日：2017-07-18

申请号：US15281604

申请日：2016-09-30

Applicant: Dropbox, Inc.

Inventor： Daniel Horn ,  Ken Elkabany ,  Keith Winstein

IPC: G06K9/36 ,  H04N19/176 ,  H04N19/124 ,  H04N19/625

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

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.

公开(公告)号：US12113989B2

公开(公告)日：2024-10-08

申请号：US18347356

申请日：2023-07-05

Applicant: Dropbox, Inc.

Inventor： Daniel Horn ,  Ken Elkabany ,  Keith Winstein

IPC: 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

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：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.