video bit reduction based on foveation - epfiscaaladvies.nl

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Predictive Perceptual Compression for Real Time Video ...

Based on this approach, we have implemented a real-time foveation aware perceptual video streaming transcoder with a fixed target bit-rate. Our transcoder system intakes live perceptual information related to the subject's eye position. Head movement is monitored via an …

EP1680925A1 - Foveated video coding and transcoding system ...

A foveated, compressed digital video signal is produced and transmitted over a limited bandwidth communication channel to a display as follows. A frequency transform-encoded digital video signal having encoded frequency coefficients representing a sequence of video frames is provided, wherein the encoding removes temporal redundancies and encodes the frequency coefficients as base layer ...

Google AI Blog: Introducing a New Foveation Pipeline for ...

Dec 05, 2017· This method gives a major benefit to reducing the severity of visual artifacts during foveated rendering. Although phase-aligned rendering is more expensive to compute than traditional foveation under the same level of acuity reduction, we can still yield a net savings by pushing foveation to more aggressive levels that would otherwise have yielded too many artifacts.

COMPARATIVE STUDY OF MPEG-4 AND H.264 VIDEO …

foveation based video coding yields higher ... required to reduce transmission bit-rate for video data content without degrading the visual quality significantly. In a ... (local bandwidth reduction) [4], saliency detection based foveating [6] and wavelet based foveated compression [3].

60 MS TO GET IT RIGHT - developer.download.nvidia.com

•Some bit depth reduction is not noticeable in the periphery •The level of acceptable bit depth reduction is highly ... •Amount of foveation varied based on responses 1 up/ 1 down adaptive staircase Foveation level = shading rate per 2^N pixels (higher is better)

Laboratory for Image and Video Engineering - The ...

In this paper, foveation, a property of the HVS, is exploited in video transcoding. The proposed foveation embedded DCT domain video transcoding can reduce the bit rate without compromising visual quality or achieve better subjective quality for a given bit rate by shaping the compression distortion according to the foveated contrast ...

Bovik, "Real-time foveation techniques for H.263 video ...

Bottom: Foveation regions where 'X' marks the fixation point. DCT domain foveation An alternative to foveation preprocessing is to incorporate the foveation filtering into the video-coding loop. The standard video coding techniques (such as the H.263) typically use DCT based video coding.

Real-Time Foveation Techniques for Low Bit Rate Video Coding

Real-Time Foveation Techniques for Low Bit Rate Video Coding Hamid R. Sheikh, Brian L. Evans and Alan C. Bovik Abstract Lossy video compression methods often rely on modeling the abilities and limitations of the intended receiver, the Human Visual System (HVS), to achieve the highest possible

Dynamic Gaze Span W indow based Foveation for Perceptual ...

loop delay associated with streaming in the network. We have designed a live eye gaze interaction based dynamic foveation windowing scheme to address the challenge. 1 Introduction The human vision offers a tremendous scope of perceptual data reduction. Only about 2 degree in our about 140 degrees vision span has sharp vision. There

Real-time foveation techniques for low bit rate video ...

Its implementation in software and in embedded systems can be efficient by embedding foveation inside the video coding loop. In case of the DCT domain foveation algorithm, we obtain reduction in complexity as well as bit rate. Foveation preserves the semantics of the bit stream and requires no modification of the decoder.

Adaptive Foveation of MPEG Video - cs.kent.edu

Adaptive Foveation of MPEG Video T H Reeves Department of Systems Design Engineering University of Waterloo Ontario, Chada, N2L 3G1 ... be either network-based as shown, or colocated with the video source, but the essential elements of the model are ... The use of bit rate reduction …

(PDF) Multilayer Bit Allocation for Video Encoding ...

The Spatial and Temporal model is improved by taking into account the foveation properties of the HVS. The visibility given by the foveation model video code bit allocation technique based on visual distortion sensitivity. The subjective test shows the performance of the proposed scheme.

video bit reduction based on foveation - alderbuebe.ch

video bit reduction based on foveation - toomasespressobar.nl. DCT based foveation fllter is used to reduce complexity for detecting foveation, edges via a reduction function block (RFME), spond to only moving edge blocks the slight degradation of video quality is ofiset by the bit savings obtained Therefore,, bit reduction based on foveation

(PDF) Effect of compressed offline foveated video on ...

Since offline foveation introduces blur in unattended video regions and thus reduces entropy, it is expected to increase compression efficiency. We have estimated the effect offline foveation has on data reduction for the six different videos shown in Figure 3.

A game attention model for efficient bit rate allocation ...

Apr 27, 2014· To meet the stringent network bandwidth requirements of cloud gaming and support more players, efficient bit rate reduction techniques are needed. In this paper, we introduce the concept of game attention model (GAM), which is basically a game context-based visual attention model, as a means for reducing the bit rate of the streaming video more ...

video bit reduction based on foveation - qlife.be

video bit reduction based on foveation - apartmanlipno-rent.eu. Foveation Scalable Video Coding with Automatic… pdf. decoded video at an arbitrary bit rate in terms of foveated visual quality measurement. A foveation-based HVS model plays an … Contact Supplier

Day 2 Immerse Pillar TimLeland - qualcomm.com

8-Bit 2.07 Megapixels 16.78 Million Colors 8-Bit 8.29 Megapixels ... Tile-based Foveation with Eye-Tracking Multiview Rendering Fine Grain Preemption ... highlights Room-Scale 6DOF with SLAM Adreno Foveation 2K x 2K @ 120 fps XR 30% Faster Graphics and Video 30% Power Reduction Improved 6DOF Hand Tracking and Controller support Iris ...

Understanding bitrates in video files - Encoding.com ...

It's important to understand how the bitrate control corresponds to video quality and the file size. In general, a higher bitrate will accommodate higher image quality in the video output. At the same bitrate, video in a newer codec such as H.264 will look substantially better than an older codec like H.263. Another consideration is Read more

Off-line Foveated Video: Effects on Compression and Perception

• How to control video fidelity based on recorded eye-data from several viewer? ... six tested videos, an average bit-rate reduction of 20 %. UCSB, 2007-03-12 Marcus Nyström, Lund University ... Six videos compressed at high bit rates, before and after off-line foveation (hence 12 videos in total). • Videos shown in random order together ...

Real-Time Foveation Techniques for Low Bit Rate Video …

Real-Time Foveation Techniques for Low Bit Rate Video Coding Hamid R. Sheikh, Brian L. Evans and Alan C. Bovik Abstract Lossy video compression methods often rely on modeling the abilities and limitations of the intended receiver, the Human Visual System (HVS), to achieve the highest possible

Foveation embedded DCT domain video transcoding ...

The proposed foveation embedded DCT domain video transcoding can reduce the bit rate without compromising visual quality or achieve better subjective quality for a given bit rate by shaping the compression distortion according to the foveated contrast sensitivity function of the HVS.

Foveated imaging - Wikipedia

Foveated imaging is a digital image processing technique in which the image resolution, or amount of detail, varies across the image according to one or more "fixation points." A fixation point indicates the highest resolution region of the image and corresponds to the center of the eye's retina, the fovea.