Abstract: A downhole logging tool and method of use for analysing portions of a seafloor borehole in seafloor drilling operations are provided. The downhole logging tool h an underwater chassis housing a power system and sensors including at least a conductivity sensor and a magnetic susceptibility sensor which, preferably, analyse the walls of the borehole. An automatically actuated switch, preferably actuated magnetically, provides power to the sensors from the power system when the downhole logging tool is not located in a designated portion of a seafloor drilling rig (e.g. when the tool is in use traversing a borehole) and removes power when the downhole logging tool is located in the designated portion of the seafloor drilling rig (e.g. when the downhole tool is not in use).

Abstract: A method for reconstructing a digital image including: obtaining gradient data of the digital image, estimating the wavelet decomposition of the digital image based on the gradient data, performing a synthesis and smoothing operation on decomposed gradient data to provide an estimate of pixel intensities from the wavelet decomposition and outputting a reconstructed digital image.