553,551 Hits in 7.2 sec

Adapting Spatial and Temporal Cases [chapter]

Valmi Dufour-Lussier, Florence Le Ber, Jean Lieber, Laura Martin
2012 Lecture Notes in Computer Science  
This paper proposes an approach to adapt cases represented in such an algebra. A spatial example in agronomy and a temporal example in cooking are given.  ...  The idea behind this adaptation approach is to apply a substitution and then repair potential inconsistencies, thanks to belief revision on qualitative algebras.  ...  This paper proposes an approach for the adaptation of spatial and temporal cases, which is based on a process integrating substitution and revision-based adaptation.  ... 
doi:10.1007/978-3-642-32986-9_8 fatcat:k5b464ccmrf23hfcicfnqhifr4

A Simulation of Temporal and Spatial Variations in Carbon at Landscape Level: A Case Study for Lake Abitibi Model Forest in Ontario, Canada

Xiaolu Zhou, Changhui Peng, Qing-Lai Dang, Jiaxin Chen, Sue Parton
2006 Mitigation and Adaptation Strategies for Global Change  
Using a case study of the Lake Abitibi Model Forest (LAMF), this study aims to assess the temporal and spatial variability in carbon storage during 1990-2000, and to present a comprehensive estimation  ...  Temporal and spatial carbon dynamics were simulated at the landscape level using ecosystem model TRIPLEX1.0 and Geographical Information System (GIS).  ...  Acknowledgments The funding for this project was supported by Canadian Foundation for Climate and Atmospheric Sciences (CFCAS), Canada Research Chair Program, The Lake  ... 
doi:10.1007/s11027-006-4583-5 fatcat:c7fb6k4ryraxjlx2k5poajm25m

Temporal and Spatial Frequency Tuning of the Flicker Motion Aftereffect

1996 Vision Research  
Observers adapted to drifting sine-wave gratings of a range of spatial and temporal frequencies.  ...  The magnitude of the MAE induced by the adaptation was measured with counterphasing test gratings of a variety of spatial and temporal frequencies.  ...  Three combinations of adapting spatial and temporal frequency resulted in no or negligible MAE (1 c/deg adapting temporal frequency 16 Hz, 4 c/deg adapting temporal frequency 1 or 0.5 Hz).  ... 
doi:10.1016/0042-6989(96)00004-1 pmid:8917759 fatcat:sngqhmdivnd2jbryp4guie7foe

Visual adjustments to temporal blur

Aaron C. Bilson, Yoko Mizokami, Michael A. Webster
2005 Optical Society of America. Journal A: Optics, Image Science, and Vision  
After observers have adapted to an edge that is spatially blurred or sharpened, a focused edge appears too sharp or blurred, respectively.  ...  These results suggest that adaptation and induction adjust visual coding so that images are focused not only in space but also in time.  ...  In the case of adaptation, changes in light adaptation are unlikely to play a role in the temporal blur settings, since the fields are spatially uniform and have the same time averaged luminance, and were  ... 
doi:10.1364/josaa.22.002281 pmid:16277297 fatcat:bbc4lill45f5tgcvq26vojyttq

Spatial and Temporal Adaptive FIR Clutter Filtering

Vincent Perrot, Jorgen Avdal, Lasse Lovstakken, Sebastien Salles, Didier Vray, Herve Liebgott, Ingvild Kinn Ekroll
2018 2018 IEEE International Ultrasonics Symposium (IUS)  
The spatial and temporal adaptive FIR filter is compared with three standard FIR clutter filters: (i) a low cutoff FIR filter, (ii) a high cutoff FIR filter, and (iii) a temporal adaptive FIR filter.  ...  In this study, a new spatial and temporal FIR clutter filter has been developed using the tissue velocity.  ...  Vector velocity fields for the temporal adaptive (top) and the spatial and temporal adaptive (bottom) FIR filters.  ... 
doi:10.1109/ultsym.2018.8579766 fatcat:4vg3zrsexvbkzebtlbqwa26v54

Motion aftereffect with flickering test stimuli depends on adapting velocity

Hiroshi Ashida, Naoyuki Osaka
1995 Vision Research  
Using sinusoidal gratings of several spatial frequencies (SF), MAE strength was measured for various adapting temporal frequencies (TF).  ...  Temporal tuning property of motion aftereffect (MAE) with flickering test stimuli (flicker MAE) was examined.  ...  Part of this research was supported by Grants 05801013 and 04801012 from the Ministry of Education, to N. Osaka.  ... 
doi:10.1016/0042-6989(94)00270-v pmid:7660589 fatcat:ijg6utm3vvbtre4ocdp3cpuwye

An adaptive framework for image and video sensing

Lior Zimet, Morteza Shahram, Peyman Milanfar, Nitin Sampat, Jeffrey M. DiCarlo, Ricardo J. Motta
2005 Digital Photography  
In this paper we outline a framework for an adaptive sensor where the spatial and temporal sampling rates are adapted to the scene.  ...  In the adaptation process, the spatial and temporal content of the video sequence are measured to evaluate the required sampling rate.  ...  Acknowlegement: This work was supported in part by NSF CAREER Grant CCR-9984246 and AFOSR grant F49620-03-1-0387.  ... 
doi:10.1117/12.587417 dblp:conf/dphoto/ZimetSM05 fatcat:u3f44eigcbga3gztc4rblnj4za

Impact of adaptation dimensions on video quality

Jens Brandt, Lars Wolf
2010 IEEE International Symposium on Consumer Electronics (ISCE 2010)  
dimension ii) adaptation in the temporal and detail dimension iii) adaptation in the spatial and detail dimension iv) adaptation in the spatial, temporal and detail dimension akiyo Bit Rate (kbit  ...  Adaptation Temporal Adaptation Detail Adaptation Conclusion Introduction Spatial Adaptation Temporal Adaptation Detail Adaptation Conclusion Spatial Adaptation -Akiyo and Foreman Sequence  ... 
doi:10.1109/isce.2010.5523727 fatcat:rn44bff3mjbo7cyl7hajwbfrtm

Spatially Adaptive Wavelet Transform for Video Coding with Multi-Scale Motion Compensation

Marta Mrak, Ebroul Izquierdo
2007 2007 IEEE International Conference on Image Processing  
Experimental results show that for fast sequences where such an application of different prediction modes is crucial, the proposed adaptive transform introduces significant objective and visual improvements  ...  The technique targets prediction of high-pass spatial subbands for motion compensation at higher scales.  ...  In wavelet-based video coding the temporal and spatial decompositions support temporal and spatial scalabilities.  ... 
doi:10.1109/icip.2007.4379156 dblp:conf/icip/MrakI07 fatcat:jd2cn7p7qvcxldzd3kirhswcki

Adaptive motion estimation and video vector quantization based on spatiotemporal non-linearities of human perception [chapter]

J. Malo, F. Ferri, J. Albert, J. M. Artigas
1997 Lecture Notes in Computer Science  
These new approaches are founded on a perception model that reproduce the relative importance given by the human visual system to any location in the spatial frequency, temporal frequency and amplitude  ...  The experiments show that the proposed procedures behave better than their equivalent (fixed-block-size motion estimation and fixed-step-size quantization of the spatial DCT) used by MPEG-2.  ...  Acknowledgements:This work has been supported by CICYT projet TIC95-676-C02-01 and IVEI (Generalitat Valenciana) project N°96/003-035.  ... 
doi:10.1007/3-540-63507-6_232 fatcat:yaqzbnhcxzc5zablwgiaklciwq

Reduced complexity spatio-temporal scalable motion compensated wavelet video encoding

D.S. Turaga, M. van der Schaar
2003 2003 International Conference on Multimedia and Expo. ICME '03. Proceedings (Cat. No.03TH8698)  
In this paper, we present a novel method for reducing the motion estimation complexity in MC Wavelet coders by selecting adaptively different spatio-temporal decomposition structures and temporal motion  ...  These multi-resolution transforms partition the spatiotemporal sequence-volume into regions corresponding to desired spatial and temporal resolutions.  ...  Hence, in this case the ME for frame 2 is performed at half the spatial resolution, while ME for frames 1 and 3 is performed at the full spatial resolution.  ... 
doi:10.1109/icme.2003.1221678 dblp:conf/icmcs/TuragaS03a fatcat:lccqxjqypfbmfgfytvqynabnbi

3-D Shape-Adaptive Directional Wavelet Transform for Object-Based Scalable Video Coding

Yu Liu, King Ngi Ngan, Feng Wu
2008 IEEE transactions on circuits and systems for video technology (Print)  
The 3-D object-based directional threading, which unifies the concept of temporal motion threading and 2-D spatial directional threading, provides the opportunities to align a series of video object planes  ...  to form a 3-D video object and exploit the spatio-temporal correlation inside the 3-D video object.  ...  WAL, is proposed by applying first 1-D shape-adaptive WAL in the temporal directional threading segment and then applying 2-D separable shape-adaptive WAL in the 2-D spatial directional threading segment  ... 
doi:10.1109/tcsvt.2008.920969 fatcat:uq6unz4x7vbfteymnk3dycrsue

A Quality-of-Experience Video Adaptor for Serving Scalable Video Applications

Chia-ho Pan, I-hsien Lee, Sheng-chieh Huang, Chung-jr Lian, Liang-gee Chen
2007 IEEE transactions on consumer electronics  
More than one video parameters include spatial frame size, temporal frame rate, and visual quality resolution are utilized to provide better scalability in scalable video coding scheme.  ...  The simulated results show the accuracy of adaptation points can match the user's preference from 78% to 93% by using proposed scheme.  ...  While spatial-temporal resolutions can also vary with client's request, the video adaptation is more complicated than single dimension case.  ... 
doi:10.1109/tce.2007.4341596 fatcat:6rnk76qpjjbutnpi2xgkt2fcuq

Spatio-temporal tuning of motion coherence detection at different luminance levels

M.J.M Lankheet, A.J van Doorn, W.A van de Grind
2002 Vision Research  
We studied effects of dark adaptation on spatial and temporal tuning for motion coherence detection.  ...  Spatial and temporal limits for coherence detection were measured using a single step pattern lifetime stimulus, in which patterns on alternate frames make a coherent step and are being refreshed.  ...  Scaling the stimuli in this case is necessary since dark adaptation has rendered the higher spatial frequencies undetectable.  ... 
doi:10.1016/s0042-6989(01)00265-6 pmid:11804632 fatcat:2u4e553nlna6fjzyey5pkc37ga

Adaptive spatial-temporal filtering applied to x-ray fluoroscopy angiography

Gert Schoonenberg, Marc Schrijver, Qi Duan, Richard Kemkers, Andrew Laine, Robert L. Galloway, Jr., Kevin R. Cleary
2005 Medical Imaging 2005: Visualization, Image-Guided Procedures, and Display  
To address this concern, an adaptive filtering process is presented to apply temporal filtering in regions without motion and spatial filtering in regions with motion.  ...  Third an IIR filter is then used to combine the spatially filtered image with the previous output image; the motion mask thus serves as a weighted input mask to determine how much spatial and temporal  ...  The authors thank Allison Bell, Matthew Neimark, Yinpeng Jin and Mike Schacht for their feedback, suggestions and their help with preparing this paper.  ... 
doi:10.1117/12.596535 dblp:conf/miigp/SchoonenbergSDK05 fatcat:4ayia2gtxvfx5kolqmmgwkbf64
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