United States Patent 10,045,050
Vanam , et al. August 7, 2018
Perceptual preprocessing filter for viewing-conditions-aware video coding
Abstract
A perceptual filter may be implemented to filter one or more spatial frequencies from a video signal that are below a contrast sensitivity limit of a viewer of the video signal. The perceptual filter may be configured to adapt one or more perceptual filter parameters on a pixel-basis based on, for example, content, viewing distance, display density, contrast ratio, display luminance, background luminance, and/or age of the viewer. A spatial cutoff frequency of the perceptual filter may be mapped to a contrast sensitivity. The perceptual filter may be used as a preprocessing step for a video encoder so as to lower an encoded bitrate. Temporal filtering of the video frames may be used to maintain continuity of a spatial cutoff frequency to ensure the perceptual filtering effects are not identified as motion by a video encoder, and the temporal filtering may be restricted to static areas of a frame.
Inventors:
Vanam; Rahul (San Diego, CA), Kerofsky; Louis (San Diego, CA), Reznik; Yuriy (San Diego, CA)
Applicant:
Name
City
State
Country
Type
Vid Scale, Inc.
Wilmington
DE
US
Assignee:
Vid Scale, Inc. (Wilmington, DE)
Family ID:
1000003456088
Appl. No.:
14/690,089
Filed:
April 17, 2015
Prior Publication Data
Document Identifier
Publication Date
US 20150312595 A1 Oct 29, 2015
Related U.S. Patent Documents
Application Number
Filing Date
Patent Number
Issue Date
61984724 Apr 25, 2014
Current U.S. Class: 1/1
Current CPC Class: H04N 19/80 (20141101); H04N 19/117 (20141101); H04N 19/136 (20141101); H04N 19/85 (20141101); H04N 19/182 (20141101); H04N 19/164 (20141101); H04N 19/154 (20141101); H04N 19/162 (20141101)
Current International Class: H04N 19/80 (20140101); H04N 19/136 (20140101); H04N 19/117 (20140101); H04N 19/182 (20140101); H04N 19/85 (20140101); H04N 19/154 (20140101); H04N 19/162 (20140101); H04N 19/164 (20140101)
Field of Search: ;375/240.29,240
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