Patent ID: 7456842
Filing Date: 2008-11-25
Classification: G01B

Abstract:
1. A structured light pattern for use in the determination of 3D surface topology of a 3D structure wherein said pattern may be projected onto such a structure and 3D surface topology thereof is determined from at least one image obtained of the structure with said pattern reflected therefrom, the pattern comprising a plurality of pairs of colored stripes, wherein each said pair comprises: two juxtaposed discrete stripes, one said stripe being of a different color from the other stripe; and a unique color edge defining a unique color transition boundary between the colors of said two adjacent stripes in a predetermined direction substantially orthogonal to a longitudinal direction of said stripes; wherein each said color edge is sufficiently unique by itself within said pattern such as to enable identification of each color edge of said pattern when said pattern is reflected from said 3D structure further comprising at least one spacer stripe between each adjacent said pair of stripes, said at least one spacer stripe being of a color having a predetermined color contrast with a said stripe of each one of said adjacent pairs of stripes that is adjacent to said at least one spacer stripe wherein said spacer stripes comprise any one of: a white stripe between adjacent pairs of stripes; or a black stripe between adjacent pairs of stripes; or a group of stripes, comprising a black stripe sandwiched between two white stripes, between adjacent pairs of stripes further comprising a trailer comprising at least one stripe adjacent to at least one or another of a first and a last said pairs taken along said direction wherein said trailer stripes comprise a group, comprising any one of a sequence of two black stripes, a white stripe, a black stripe, a white stripe and a black stripe adjacent to said first pair of stripes; or a sequence of a black stripe, a white stripe, a black stripe, a white stripe and a black stripe adjacent to said last pair of stripes.