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Perceptual preprocessing filter for viewing-conditions-aware video coding

A filter and filter bandwidth technology, applied in digital video signal modification, electrical components, image communication, etc., can solve the problems that video stream rate adaptation technology cannot take into account visual conditions and affect video quality, etc.

Inactive Publication Date: 2015-09-23
VID SCALE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Video streaming rate adaptation techniques may not take into account visual conditions, which may affect the video quality perceived by the end user of the video streaming client

Method used

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  • Perceptual preprocessing filter for viewing-conditions-aware video coding
  • Perceptual preprocessing filter for viewing-conditions-aware video coding
  • Perceptual preprocessing filter for viewing-conditions-aware video coding

Examples

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Embodiment Construction

[0054] Mobile video streaming and mobile video conferencing provide users with flexible access to and / or viewing of video content in various locations and at various times. A WTRU such as a mobile device may have the flexibility to set up a WTRU for a user at a desired distance and direction to suit user end preferences, as compared to a traditional, possibly more static, television display. A user may not be limited to a specific location, such as watching content at home, in a theater, etc., but may watch content anywhere in various locations.

[0055] One or more factors other than communication network conditions may determine the visibility of video information presented on a display screen of a streaming client (e.g., a mobile device), which may include one or more of the following: The viewing distance of the mobile device, the size of the display screen of the mobile device, the contrast sensitivity of the display screen, the pixel density of the display screen, and so...

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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. Estimates of DC, amplitude, and contrast sensitivity of a video frame may be performed. 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. The oblique effect phenomena of the human visual system may be incorporated into the perceptual filter.

Description

[0001] Cross References to Related Applications [0002] This application claims U.S. Provisional Application Serial No. 61 / 727,203, filed November 16, 2012, U.S. Provisional Application Serial No. 61 / 834,789, filed June 13, 2013, and The benefit of US Provisional Application Serial No. 61 / 875,415, each of which is hereby incorporated by reference in its entirety. Background technique [0003] Video and mobile video are part of the rapid growth of traffic in the global Internet and mobile Internet. A video streaming client, such as a Wireless Transmit Receive Unit (WTRU), can apply streaming rate adaptation techniques, such as selecting bit rate, resolution, etc., based on communication network conditions (e.g., available bandwidth) to provide the highest possible streaming multimedia playback quality. [0004] Video streaming rate adaptation techniques may fail to take into account visual conditions, which may affect video quality perceivable by an end user of a video strea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/182H04N19/136H04N19/117H04N19/164
CPCH04N19/136H04N19/164H04N19/182H04N19/117H04N19/80
Inventor R·瓦纳莫Y·雷兹尼克L·克拉夫斯基
Owner VID SCALE INC
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