p106fig03.24 In response to the Synthetic Aperture image (upper corner left), a shunting on-center off-surround network "discounts the illiminant" and thereby normalizes cell activities to compute feature contours, without causing saturation (upper right corner). Multiple-scale boundaries form in response to spatially coherent activities in the feature contours (lower left corner) and create the webs, or containers, into which the feature contours fill-in the final surface representations (lower right corner).<BR>||  Do these ideas work on hard problems? SAR!<TABLE border="1"><TR><TD><B>input image</td><TD><B>feature contours</td><TD><B>boundary contours</td><TD><B>filled-in surface</td></tr><TR><TD>Synthetic Aperture Radar: sees through weather 5 orders of magnitude of power in radar return</td><TD>discounting the illuminant<UL><LI>normalizes the image: preseves RELATIVE activities without SATURATION<LI>shows individual PIXELS</ul></td><TD>boundaries complete between regions where normalized feature contrasts change</td><TD>filling-in averages brightnesses within boundary compartments</td></tr></table>