Now showing items 1-10 of 85
Optimally Weighted Highpass Filters using Multiscale Analysis
An obvious approach to image enhancement is to sharpen bright regions of an image more than darker regions. One very simple method to accomplish this is to weight the amount of highpass filtering proportional to the local ...
Hybrid Linear/Quadratic Time-Frequency Attributes
We present an efficient method for robustly calculating time-frequency attributes of a signal, including instantaneous mean frequency, bandwidth, kurtosis, and other moments. Most current attribute estimation techniques ...
Applications of Terahertz Imaging
The recent advances involving imaging with sub-picosecond terahertz pulses have opened up a wide range of possibilities in the applications of far-infrared technology. For the first time, a commercially viable terahertz ...
Throughput Measures for Delay-constrained Communications in Fading Channels
Fading channels, often seen in wireless systems, provide an unfavorable environment for reliable communications. Current methods for evaluating the performance of fading channels include ergodic capacity and <i>epsilon</ ...
JPEG Compression History Estimation for Color Images
We routinely encounter digital color images that were previously compressed using the Joint Photographic Experts Group (JPEG) standard. En route to the image's current representation, the previous JPEG compression's various ...
Sparse Signal Detection from Incoherent Projections
The recently introduced theory of Compressed Sensing (CS) enables the reconstruction or approximation of sparse or compressible signals from a small set of incoherent projections; often the number of projections can be ...
Optimal Transmit Spectra for Communication in the Presence of Crosstalk and Imperfect Echo Cancellation
In many communication systems, including Digital Subscriber Lines, performance is severely limited by crosstalk interference. Previous work has presented a general framework for designing optimal transmit spectra for ...
An On-Line Signal-Dependent Time-Frequency Representation
Blind Crosstalk Cancellation for DMT Systems
As the deployment of broadband communication systems such as DSL continues to grow, system performance in terms of capacity and error rates is severely limited by crosstalk interference. In order to continue deploying high ...
Network and User Driven Alpha-Beta Onâ Off Source Model for Network Traffic
We shed light on the effect of network resources and user behavior on network traffic through a physically motivated model. The classical onâ off model successfully captures the long-range, second-order correlations of ...