Method for measuring target depth by using optical field focusing image

Abstract

Depth information of the scene is the key to the three-dimensional (3D) reconstruction. Traditional depth mea- surement methods are based on stereo vision or defocusing image measurement, which have bad real-time performance, high computational complexity and cost much. Optical field is a new technology that can record the 3D information without the focusing process. Using optical field refocusing can rebuild scene at any depth through a single image, as for complex scene using window scanning to get depth information of different position. When set the size of window to 1 pixel can get the depth value pixel by pixel from gradient operator. Finally gain a high-resolution and high-accuracy depth map. Optical field technol- ogy applying to the depth measurement is equivalent to an improved focusing distance measuring method. The new method is simple, has high precision and strong real-time performance to apply to multi-objective and non-cooperative targets.