RESEARCH INTERESTS
I completed a Ph. D. in the Electrical Engineering
Department at the University of Texas at Austin, under
Dr. Alan C. Bovik and
Dr. Brian L. Evans.
My Ph. D. research involved the design and visual quality assessment
of forward and inverse error diffusion halftoning algorithms. We
are able to characterize the performance of both halftoning and
inverse halftoning schemes using perceptual criteria. The common
distortion measure of PSNR (peak signal-to-noise-ratio) is inapplicable
to forward and inverse halftones, because of the large amount
of frequency shaping that occurs during these operations. In this
research, we decouple these frequency distortions from the
noise injection due to quantization, allowing the degree of frequency shaping
and the visibility of quantization noise to be assessed independently.
Previous and present research interests include:
- Digital image halftoning and inverse halftoning
- Quality metrics for halftones and inverse halftones
- Server-side image processing over the Internet
- Secure printing over the Internet
- Multispectral image compression
- Real-time motion detection and object tracking
- Digital audio signal processing
- Non-linear generation of acoustic signals using amplitude-modulated
ultrasonic carriers
- Negative amplifier output impedance for control of loudspeaker
frequency response