This paper presents a simple and efficient solution to vision guided autonomous landing of a light-weight (<150 Kg) unmanned helicopter on a smart landing platform, called ISLANDS—Intelligent Self-Leveling and Nodal Docking System. The advantage of ISLANDS is that it may allow the helicopter upon docking to recharge its batteries or refuel, thus, indirectly increasing endurance and flight range...

Peripheral vision is fundamentally limited not by the visibility of features, but by the spacing between them [1]. When too close together, visual features can become "crowded" and perceptually indistinguishable. Crowding interferes with basic tasks such as letter and face identification and thus informs our understanding of object recognition breakdown in peripheral vision [2]. Multiple propos...

We compared the number of spatial frequency and orientation mechanisms underlying first- versus second-order processing by measuring discrimination at detection threshold for first- and second-order Gabors to determine the smallest difference in spatial frequency and orientation that permits accurate discrimination at threshold. For second-order gratings, the number of channels is the same as f...

BACKGROUND Some bees and wasps have evolved nocturnal behavior, presumably to exploit night-flowering plants or avoid predators. Like their day-active relatives, they have apposition compound eyes, a design usually found in diurnal insects. The insensitive optics of apposition eyes are not well suited for nocturnal vision. How well then do nocturnal bees and wasps see? What optical and neural a...

During locomotion, people need to keep up-to-date on their changing spatial orientation so that they can coordinate the force and direction of their actions with their surroundings. In 4 experiments concerning spatial orientation while walking without vision, 4-year-olds and adults viewed l or more targets, were blindfolded, were guided to a new point o fobservation, and were asked to aim a poi...

reviewed by: Charles Toth, Research Professor, The Ohio State University, Columbus, Ohio and Stewart Walker, San Diego, California. Photogrammetric Computer Vision represents a milestone publication in modern photogrammetry. Long years of intense labor by two legendary authors, eminent professors of geomatics from Bonn and Darmstadt, and a talented team of assistants, have produced a true magnu...