Dr. Thom Carney Profile

Dr. Thom Carney

at Univ of California Berkeley

SPIE Involvement:

Author

Publications (22)

Proceedings Article | 14 March 2013 Paper

Initial spatio-temporal domain expansion of the Modelfest database

Thom Carney, Sahar Mozaffari, Sean Sun, Ryan Johnson, Sharonya Shrivastava, Priscilla Shen, Emma Ly

Proceedings Volume 8651, 86510F (2013) https://doi.org/10.1117/12.2004724

KEYWORDS: Data modeling, Visual process modeling, Databases, Modulation, Binary data, Video, Spatial frequencies, Human vision and color perception, Performance modeling, Motion models

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The first Modelfest group publication appeared in the SPIE Human Vision and Electronic Imaging conference proceedings in 1999. "One of the group's goals is to develop a public database of test images with threshold data from multiple laboratories for designing and testing HVS (Human Vision Models)." After extended discussions the group selected a set of 45 static images thought to best meet that goal and collected psychophysical detection data which is available on the WEB and presented in the 2000 SPIE conference proceedings. Several groups have used these datasets to test spatial modeling ideas. Further discussions led to the preliminary stimulus specification for extending the database into the temporal domain which was published in the 2002 conference proceeding. After a hiatus of 12 years, some of us have collected spatio-temporal thresholds on an expanded stimulus set of 41 video clips; the original specification included 35 clips. The principal change involved adding one additional spatial pattern beyond the three originally specified. The stimuli consisted of 4 spatial patterns, Gaussian Blob, 4 c/d Gabor patch, 11.3 c/d Gabor patch and a 2D white noise patch. Across conditions the patterns were temporally modulated over a range of approximately 0-25 Hz as well as temporal edge and pulse modulation conditions. The display and data collection specifications were as specified by the Modelfest groups in the 2002 conference proceedings. To date seven subjects have participated in this phase of the data collection effort, one of which also participated in the first phase of Modelfest. Three of the spatio-temporal stimuli were identical to conditions in the original static dataset. Small differences in the thresholds were evident and may point to a stimulus limitation. The temporal CSF peaked between 4 and 8 Hz for the 0 c/d (Gaussian blob) and 4 c/d patterns. The 4 c/d and 11.3 c/d Gabor temporal CSF was low pass while the 0 c/d pattern was band pass. This preliminary expansion of the Modelfest dataset needs the participation of additional laboratories to evaluate the impact of different methods on threshold estimates and increase the subject base. We eagerly await the addition of new data from interested researchers. It remains to be seen how accurately general HVS models will predict thresholds across both Modelfest datasets.

Proceedings Article | 18 February 2010 Paper

Human brain imaging during controlled and natural viewing

Stanley Klein, Thom Carney, David Kim, Sangita Dandekar, Claudio Privitera

Proceedings Volume 7527, 752707 (2010) https://doi.org/10.1117/12.849104

KEYWORDS: Electroencephalography, Magnetoencephalography, Visualization, Eye, Wavelets, Brain-machine interfaces, Functional magnetic resonance imaging, Magnetic resonance imaging, Skull, Head

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Proceedings Article | 14 February 2008 Paper

Combining MRI and VEP imaging to isolate the temporal response of visual cortical areas

Thom Carney, Justin Ales, Stanley Klein

Proceedings Volume 6806, 680608 (2008) https://doi.org/10.1117/12.773383

KEYWORDS: Visualization, Electroencephalography, Magnetoencephalography, Functional magnetic resonance imaging, Electrodes, Visual process modeling, Process control, Magnetic resonance imaging, Signal to noise ratio, Spatial frequencies

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The human brain has well over 30 cortical areas devoted to visual processing. Classical neuro-anatomical as well as fMRI studies have demonstrated that early visual areas have a retinotopic organization whereby adjacent locations in visual space are represented in adjacent areas of cortex within a visual area. At the 2006 Electronic Imaging meeting we presented a method using sprite graphics to obtain high resolution retinotopic visual evoked potential responses using multi-focal m-sequence technology (mfVEP). We have used this method to record mfVEPs from up to 192 non overlapping checkerboard stimulus patches scaled such that each patch activates about 12 mm² of cortex in area V1 and even less in V2. This dense coverage enables us to incorporate cortical folding constraints, given by anatomical MRI and fMRI results from the same subject, to isolate the V1 and V2 temporal responses. Moreover, the method offers a simple means of validating the accuracy of the extracted V1 and V2 time functions by comparing the results between left and right hemispheres that have unique folding patterns and are processed independently. Previous VEP studies have been contradictory as to which area responds first to visual stimuli. This new method accurately separates the signals from the two areas and demonstrates that both respond with essentially the same latency. A new method is introduced which describes better ways to isolate cortical areas using an empirically determined forward model. The method includes a novel steady state mfVEP and complex SVD techniques. In addition, this evolving technology is put to use examining how stimulus attributes differentially impact the response in different cortical areas, in particular how fast nonlinear contrast processing occurs. This question is examined using both state triggered kernel estimation (STKE) and m-sequence "conditioned kernels". The analysis indicates different contrast gain control processes in areas V1 and V2. Finally we show that our m-sequence multi-focal stimuli have advantages for integrating EEG and MEG for improved dipole localization.

Proceedings Article | 14 February 2008 Paper

The pupil dilation response to visual detection

Claudio Privitera, Laura Renninger, Thom Carney, Stanley Klein, Mario Aguilar

Proceedings Volume 6806, 68060T (2008) https://doi.org/10.1117/12.772844

KEYWORDS: Visualization, Target detection, Eye, Target recognition, Sensors, Temporal resolution, Satellite imaging, Earth observing sensors, Satellites, Error analysis

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Proceedings Article | 9 February 2006 Paper

Advances in multifocal methods for imaging human brain activity

Thom Carney, Justin Ales, Stanley Klein

Proceedings Volume 6057, 605716 (2006) https://doi.org/10.1117/12.674151

KEYWORDS: Visualization, Electrodes, Video, Modulation, Electroencephalography, Brain, Visual cortex, Cortical activation, Neuroimaging, Functional magnetic resonance imaging

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Proceedings Article | 13 June 2002 Paper

Wide-angle cornea-sclera (OCULAR) topography

Stanley Klein, John Corzine, Jacob Corbin, Sheldon Wechsler, Thom Carney

Proceedings Volume 4611, (2002) https://doi.org/10.1117/12.470589

KEYWORDS: Cornea, Eye, Contact lenses, Surgery, Sclera, Cameras, Optical spheres, Standards development, Mirrors, Light scattering

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Proceedings Article | 30 May 2002 Paper

Extending the modelfest image/threshold database into the spatio-temporal domain

Thom Carney, Stanley Klein, Brent Beutter, Anthony Norcia, Chien-Chung Chen, Christopher Tyler, Walter Makous, Andrew Watson, Simon Cropper, Ariella Popple, Ken Robertson, Velitchko Manahilov, Bill Simpson, Klara Wenzel

Proceedings Volume 4662, (2002) https://doi.org/10.1117/12.469510

KEYWORDS: Data modeling, Visual process modeling, Motion models, Performance modeling, Binary data, Video, Databases, Visual system, Visualization, Image compression

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Proceedings Article | 7 June 2000 Paper

Evaluation of entire-cornea topography measurement

Fergal Shevlin, Stanley Klein, Robert Mandell, Thom Carney

Proceedings Volume 3908, (2000) https://doi.org/10.1117/12.387538

KEYWORDS: Cornea, Reflection, Reconstruction algorithms, Detection and tracking algorithms, Computer simulations, Manufacturing, Data centers, Calibration, Distortion, Shape analysis

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Proceedings Article | 2 June 2000 Paper

Modelfest: year one results and plans for future years

Thom Carney, Christopher Tyler, Andrew Watson, Walter Makous, Brent Beutter, Chien-Chung Chen, Anthony Norcia, Stanley Klein

Proceedings Volume 3959, (2000) https://doi.org/10.1117/12.387150

KEYWORDS: Data modeling, Visual process modeling, Spatial frequencies, Human vision and color perception, Databases, Video compression, Composites, Visualization, Performance modeling, Image compression

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Proceedings Article | 3 May 2000 Paper

Tracking irregular peripheral image rings in videokeratography

Shahram Dastmalchi, Thom Carney

Proceedings Volume 3911, (2000) https://doi.org/10.1117/12.384895

KEYWORDS: Cornea, Image segmentation, Image processing algorithms and systems, Nonlinear filtering, Image filtering, Linear filtering, Image processing, Annealing, Bandpass filters, Binary data

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Proceedings Article | 3 May 2000 Paper

Automated video tracking of contact lens motion

Thom Carney, Shahram Dastmalchi

Proceedings Volume 3911, (2000) https://doi.org/10.1117/12.384899

KEYWORDS: Video, Eye, Contact lenses, Cornea, Motion models, Motion measurement, Lens design, Computing systems, Image filtering, Control systems

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Proceedings Article | 19 May 1999 Paper

Effects of dynamic quantization noise on video quality

Thom Carney, Yuan-Chi Chang, Stanley Klein, David Messerschmitt

Proceedings Volume 3644, (1999) https://doi.org/10.1117/12.348435

KEYWORDS: Video, Video compression, Quantization, Video coding, Image compression, Algorithm development, Visualization, Image segmentation, Computer programming, Signal processing

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Proceedings Article | 19 May 1999 Paper

Development of an image/threshold database for designing and testing human vision models

Thom Carney, Stanley Klein, Christopher Tyler, Amnon Silverstein, Brent Beutter, Dennis Levi, Andrew Watson, Adam Reeves, Anthony Norcia, Chien-Chung Chen, Walter Makous, Miguel Eckstein

Proceedings Volume 3644, (1999) https://doi.org/10.1117/12.348473

KEYWORDS: Visual process modeling, Data modeling, Spatial frequencies, Databases, Visualization, Image quality, Image compression, Human vision and color perception, Performance modeling, Linear filtering

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Proceedings Article | 28 December 1998 Paper

Expanding network video capacity with delay-cognizant video coding

Yuan-Chi Chang, David Messerschmitt, Thom Carney

Proceedings Volume 3653, (1998) https://doi.org/10.1117/12.334730

KEYWORDS: Video, Video coding, Video compression, Computer programming, Image segmentation, Image quality, Switches, Image compression, Quantization, Visualization

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Proceedings Article | 17 July 1998 Paper

Mindseye: a visual programming and modeling environment for imaging science

Thom Carney

Proceedings Volume 3299, (1998) https://doi.org/10.1117/12.320152

KEYWORDS: Visual process modeling, Visualization, Image processing, Image filtering, Computer programming, Motion models, Image compression, Human vision and color perception, Human-machine interfaces, Performance modeling

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Proceedings Article | 17 July 1998 Paper

Effects of temporal jitter on video quality: assessment using psychophysical and computational modeling methods

Yuan-Chi Chang, Thom Carney, Stanley Klein, David Messerschmitt, Avideh Zakhor

Proceedings Volume 3299, (1998) https://doi.org/10.1117/12.320108

KEYWORDS: Video, Video compression, Video coding, Computer programming, Image segmentation, Image quality, Visualization, Quantization, Human vision and color perception, Computational modeling

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Proceedings Article | 3 June 1997 Paper

Seven models of masking

Stanley Klein, Thom Carney, Lauren Barghout-Stein, Christopher Tyler

Proceedings Volume 3016, (1997) https://doi.org/10.1117/12.274510

KEYWORDS: Transducers, Visual process modeling, Data modeling, Spatial frequencies, Visualization, Image compression, Visibility, Samarium, Medical imaging, Eye

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Proceedings Article | 4 April 1997 Paper

Gray-scale adjacent pixel luminance nonlinearity compensation with three-color guns

Thom Carney, Stanley Klein

Proceedings Volume 3018, (1997) https://doi.org/10.1117/12.271591

KEYWORDS: Video, Data modeling, Raster graphics, Photometry, Analytical research, MATLAB, Sensors, Error analysis, Calibration, Visualization

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Proceedings Article | 22 April 1996 Paper

Visual masking near spatiotemporal edges

Thom Carney, Stanley Klein, Quingmin Hu

Proceedings Volume 2657, (1996) https://doi.org/10.1117/12.238736

KEYWORDS: Image compression, Visual process modeling, Visualization, Video, Video compression, Process control, Human vision and color perception, Visual system, Data modeling, Visual compression

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Proceedings Article | 20 April 1995 Paper

Improved lookup table to correct CRT adjacent pixel nonlinearity

Stanley Klein, Thom Carney, Q. James Hu

Proceedings Volume 2411, (1995) https://doi.org/10.1117/12.207536

KEYWORDS: Raster graphics, Data modeling, Displays, Video, CRTs, Image quality, MATLAB, Spatial frequencies, Solids, Visibility

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Proceedings Article | 27 August 1992 Paper

Relevance of human vision to JPEG-DCT compression

Stanley Klein, D. Amnon Silverstein, Thom Carney

Proceedings Volume 1666, (1992) https://doi.org/10.1117/12.135968

KEYWORDS: Quantization, Image compression, Spatial frequencies, Visibility, Human vision and color perception, Visual process modeling, Visualization, Image processing, Contrast sensitivity, Fourier transforms

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Proceedings Article | 1 June 1991 Paper

"Perfect" displays and "perfect" image compression in space and time

Stanley Klein, Thom Carney

Proceedings Volume 1453, (1991) https://doi.org/10.1117/12.44355

KEYWORDS: Image compression, Image quality, Quantization, Wavelets, Spatial frequencies, Human vision and color perception, Image quality standards, Visual system, Visualization, Image processing

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Showing 5 of 22 publications

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