Subjective quality testing of a perceptual‐model‐based variable frame rate (VFR) LPC vocoder

1977 ◽  
Vol 62 (S1) ◽  
pp. S65-S65
Author(s):  
A. W. F. Huggins ◽  
R. Viswanathan
Keyword(s):  
Subjective Quality ◽  
Frame Rate ◽  
Perceptual Model ◽  
Model Based ◽  
Quality Testing

In-loop perceptual model-based rate-distortion optimization for HEVC real-time encoder

2018 ◽  
Vol 17 (2) ◽  
pp. 293-311 ◽  
Author(s):  
Qiang Hu ◽  
Jun Zhou ◽  
Xiaoyun Zhang ◽  
Zhiyong Gao ◽  
Ming-Ting Sun
Keyword(s):  
Real Time ◽  
Rate Distortion ◽  
Rate Distortion Optimization ◽  
Perceptual Model ◽  
Model Based

scholarly journals A Model-Based Gaze Tracking System

1997 ◽  
Vol 06 (02) ◽  
pp. 193-209 ◽  
Author(s):  
Rainer Stiefelhagen ◽  
Jie Yang ◽  
Alex Waibel
Keyword(s):  
Tracking System ◽  
Facial Feature ◽  
Frame Rate ◽  
Multimodal Interfaces ◽  
Feature Points ◽  
Gaze Tracking ◽  
Video Teleconferencing ◽  
Model Based ◽  
Potential Applications ◽  
Perspective Model

In this paper we present a non-intrusive model-based gaze tracking system. The system estimates the 3-D pose of a user's head by tracking as few as six facial feature points. The system locates a human face using a statistical color model and then finds and tracks the facial features, such as eyes, nostrils and lip corners. A full perspective model is employed to map these feature points onto the 3D pose. Several techniques have been developed to track the features points and recover from failure. We currently achieve a frame rate of 15+ frames per second using an HP 9000 workstation with a framegrabber and a Canon VC-C1 camera. The application of the system has been demonstrated by a gaze-driven panorama image viewer. The potential applications of the system include multimodal interfaces, virtual reality and video-teleconferencing.

scholarly journals A QUADTREE ORGANIZATION CONSTRUCTION AND SCHEDULING METHOD FOR URBAN 3D MODEL BASED ON WEIGHT

2017 ◽  
Vol XLII-2/W7 ◽  
pp. 977-980
Author(s):  
C. Yao ◽  
G. Peng ◽  
Y. Song ◽  
M. Duan
Keyword(s):  
3D Model ◽  
Frame Rate ◽  
Digital City ◽  
Model Data ◽  
Organization Management ◽  
Model Based ◽  
Urban Models ◽  
Scheduling Method ◽  
City Model ◽  
Organization Construction

The increasement of Urban 3D model precision and data quantity puts forward higher requirements for real-time rendering of digital city model. Improving the organization, management and scheduling of 3D model data in 3D digital city can improve the rendering effect and efficiency. This paper takes the complexity of urban models into account, proposes a Quadtree construction and scheduling rendering method for Urban 3D model based on weight. Divide Urban 3D model into different rendering weights according to certain rules, perform Quadtree construction and schedule rendering according to different rendering weights. Also proposed an algorithm for extracting bounding box extraction based on model drawing primitives to generate LOD model automatically. Using the algorithm proposed in this paper, developed a 3D urban planning&management software, the practice has showed the algorithm is efficient and feasible, the render frame rate of big scene and small scene are both stable at around 25 frames.

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