| 摘要 |
Dynamic projection of at least first and second patterns contributes detectable disparity onto a scene that includes a target object. The scene is imaged with two-dimensional cameras whose acquired imagery includes disparity contributions whose presence enable a three-dimensional reconstruction depth map to be rapidly and accurately generated. In one embodiment coherent light is input to a first DOE within whose near range output is disposed a second DOE, whose far range output projects an image. Electronically varying effective optical distance between the two DOEs varies the pattern projected from the second DOE. A processor system and algorithms enable dynamic intelligent selection of projected patterns to more readily discern target object characteristics: shape, size, velocity. Patterns can implement spatio-temporal depth reconstruction, spatio-temporal depth reconstruction, and even single-camera spatio-temporal light coding reconstruction. Target objects may be scanned or may make gestures that are rapidly detected and recognized by the system and method. |
| 主权项 |
1. A method for use with a multi-pattern projection system, coupleable to an acquisition system, to enhance dynamic reconstruction of a three-dimensional (x,y,z) depth map obtained from an imaged scene in which at least one target object may be present, said scene imaged by an acquisition system that optically acquires within a field of view (FOV) of said acquisition system at least a portion of said scene, said imaged scene processed by a processor system coupled to said acquisition system to yield said three-dimensional (x,y,z) depth map, the method including the following steps:
(a) providing a light source outputting optical energy; (b) providing an electronically spatially reconfigurable pattern generator (SRPG) that includes: a first diffractive optical element (DOE), characterized by a near field, disposed optically downstream from said light source so as to receive at least some of said optical energy; a second DOE, characterized by a far field, disposed optically downstream from and within said near field of said first DOE, said first DOE and said second DOE being spaced-apart a distance Δz, said second DOE processing optical energy received from said first DOE and projecting a pattern P within said far field of said second DOE; and (c) providing means for electronically controllably varying effective optical length traversed by optical energy from said light source traversing from said first DOE to said second DOE; wherein when said means for electronically controllably varying causes magnitude of said effective optical length to be a first distance said second DOE projects a first pattern P1 and when said means for controllably varying causes magnitude of said effective optical length to be a second distance said second DOE projects a second different pattern P2; and wherein disparity contributions resulting from presence of said first pattern P1 and said second pattern P2 in said scene enables a three-dimensional depth map of a target object in said scene to be more rapidly, and/or more accurately generated than if only one pattern were used. |
