Active imaging

Active Range Imaging 2

Beamforming for Active Sonar Imaging

This thesis addresses the use of adaptive beamforming and imaging methods applied to active sonar. While adaptive beamformers are known to offer improved performance when applied to passive sonars, their use is limited in active sonar systems. In this thesis, we investigate the potential performance gains of using adaptive beamforming methods for a range of active sonar applications. Key challe...

Bayesian image restoration for mosaic active imaging

In this paper, we focus on the restoration of images acquired with a new active imaging concept. This new instrument generates a mosaic of active imaging acquisitions. We rst describe a simpli ed Bayesian model of this so-called mosaic active imaging . We also assume a prior on the distribution of images, using the total variation, and deduce a restoration algorithm. This algorithm iterates one...

Active confocal imaging for visual prostheses

There are encouraging advances in prosthetic vision for the blind, including retinal and cortical implants, and other "sensory substitution devices" that use tactile or electrical stimulation. However, they all have low resolution, limited visual field, and can display only few gray levels (limited dynamic range), severely restricting their utility. To overcome these limitations, image processi...

Active Microwave Imaging for Breast Cancer Detection

Active microwave imaging is explored as an imaging modality for early detection of breast cancer. When exposed to microwaves, breast tumor exhibits electrical properties that are significantly different from that of healthy breast tissues. The two approaches of active microwave imaging — confocal microwave technique with measured reflected signals and microwave tomographic imaging with measured...