Cheng S Chang

US Patent:

20120201462, Aug 9, 2012

Filed:

Oct 29, 2009

Appl. No.:

13/259521

Inventors:

Cheng Chang - New York NY, US
Erik Ordentlich - San Jose CA, US
Krishnamurthy Viswanathan - Mountain View CA, US
Marcelo Weinberger - San Jose CA, US

International Classification:

G06K 9/46
G06K 9/36

US Classification:

382190, 382248

Abstract:

A joint image compression system () and method () compress a target image and a reference image under a selected transform to produce a compressed difference image. The joint image compression system includes a computer readable media () and a computer program () stored on the computer readable media. The computer program includes instructions that implement selecting () a transform from among a plurality of transforms that includes a subset determined projective (SDP) transform, where the selected transform minimizes a cumulative mapping error (CME) for corresponding feature points in each of a target image () and a reference image (). The instructions further implement applying () the selected transform to one of the target image and the reference image; forming () a difference image under the selected transform and compressing () the difference image to produce a compressed difference image.

US Patent:

20220229805, Jul 21, 2022

Filed:

Jun 4, 2020

Appl. No.:

16/893262

Inventors:

- Mountain View CA, US
Dirk Meister - Mountain View CA, US
Cheng Chang - Milpitas CA, US
Chu Zhang - Santa Clara CA, US

International Classification:

G06F 16/11
G06F 11/14
G06F 16/27

Abstract:

An illustrative data storage system captures snapshots of a data structure based on snapshot creation schedules and sets retention periods for the snapshots based on snapshot retention schedules. The data storage system eradicates snapshots based on expirations of the retention periods. In certain examples, the data storage system determines a rule to use to capture a snapshot based on a state of snapshots within one or more lookback periods and/or based on a set of rules each defining a snapshot capture schedule and a snapshot retention schedule.