Underwater audiological testing of a diver communicator

Diver-based Control of a Tethered Unmanned Underwater Vehicle

Human-robot communication with an underwater vehicle is a complex problem. Standard wireless communication protocols are unavailable, and the lack of direct supervision from surface-based operators reduces situational awareness and operational efficiencies. Here we describe recent research results with tethered operation of autonomous vehicles at depth by diving operators. We review different o...

Quantifying Relative Diver Effects in Underwater Visual Censuses

Diver-based Underwater Visual Censuses (UVCs), particularly transect-based surveys, are key tools in the study of coral reef fish ecology. These techniques, however, have inherent problems that make it difficult to collect accurate numerical data. One of these problems is the diver effect (defined as the reaction of fish to a diver). Although widely recognised, its effects have yet to be quanti...

A fractal video communicator

The image quality and compression ratio trade-oos of ve diierent 176 144 pels quarter common intermediate format (QCIF) fractal image codecs are investigated by simulation. The average peak signal-to-noise ratio (PSNR) ranges from 29 dB to 37 dB, while the coding rate from 0.24 bit/pel (bpp) to 1.22 bit/pel, as seen in Table 1. Two of the candidate co-decs, a 0.28 bit/pel and a 1.1 bit/pel code...

Temperature relations and underwater endurance of the smallest homeothermic diver, the water shrew.

Trust me, I'm a communicator.