Abstract: A method and a system for three-dimensional modeling of a three-dimensional scene features, are described. According to the present invention, a reference-image is captured from a known angle while an array of two-dimensional random patterns is projected onto a reference surface from another known angle. The reference image is turned in relation to the reference surface. Then, an image of the scene is captured while the array of two-dimensional random patterns is projected onto it from the same angles. By matching the patterns of these images and measuring the movement between the two projected patterns, the third dimension is computed using triangulation techniques.

Abstract: This invention discloses an optical detector system, including a photo detector generating an electrical current according to light received thereby, voltage terminals at opposite sides of the photo detector for connection to a voltage source, a pair of resistors each connected between a voltage terminal and the respective side of the photo detector, a pair of matched amplifiers each having an input connected to the juncture between the respective resistor and the respective side of the photo detector, each of the matched amplifiers having an input resistance substantially less than that of the resistor to which it is connected, and an output circuit combining the outputs of the matched amplifiers.