A mobile communication device includes first and second housing sections movably connected so as to move relative to one another between open and closed positions. As the size of the feature information is small compared with the data copies, and as feature information is transmitted using prioritized messages, delays caused by congestion in the network are reduced. A first orientation of an aperture can be selected based on the characteristics of the first portion of the subterranean formation. R5 is preferably a C1-10 alkyl group, an alkenyl group, an alkynyl group, or a benzyl group. The masked local contrasts are calculated using a set of convolution kernels scaled to simulate the performance of the human visual system, and \u03a8 is measured in units of just-noticeable differences.