Affiliations: [a] Information Science and Technology Institute, Hunan Agricultural University, Changsha, Hunan, China | [b] College of Resources and Environment, Hunan Agricultural University, Changsha, Hunan, China
Abstract: Depth information of the scene is the key to the
three-dimensional (3D) reconstruction. Traditional depth measurement 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
technology 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.
Keywords: Depth measurement, optical field focusing, gradient, clarity-evaluation
