Underwater imaging on self-contained tethered systems

Underwater imaging has become a staple tool used by scientists exploring the deep ocean. Advanced camera systems are able to combine quantitative measurements from in-situ sensors with qualitative imaging to provide high fidelity multi-dimensional datasets which can be used to support a wide range of science questions. This includes benthic characterization and mapping, identification of biota and marine biology density studies. The CSIRO Oceans and Atmosphere business unit in Hobart has a long history of developing systems capable of imaging both the mid-water and benthic environments. The most common platform is an integrated system of cameras and sensors which is able to take images and video while tethered to a surface vessel. This type of platform strikes a balance between cost, image quality and survey area. It's less maneuverable than an ROV but less costly and is able to carry a much larger camera payload. This paper will discuss the development of CSIRO's newest towed body; the Deep Towed Camera System. In particular the paper will focus on the design of the imaging systems on the platform and use of stereo imaging for quantitative analysis and sizing of targets. Finally, the paper will discuss upcoming sea trials of the platform and future work in the ongoing development and improvement of the system.