Research On Active Light Field Imaging Technology Based On Phase Coding

Facing the real scene,the traditional camera can only capture the integral intensity on the two-dimensional image plane,while the light field imaging can record the spatial and angular information of light at the same time,and expand the dimension of acquisition and processing of optical signal to four-dimensional.As a novel computational imaging technology,light field imaging can achieve such imaging functions as viewpoint switching,digital focusing and depth perception,This paper exploring an Active Optical Field Imaging Technology Based on Phase Coding by Combining Optical Field Imaging and Structural Illumination to study the focuses on depth estimation and phase estimation.1.Since the depth estimation of passive light field depends on image intensity information,is easily disturbed by surface reflectivity,ambient illumination,scene occlusion,detection noise and some other factors,which affects the robustness and accuracy of depth estimation.In this paper,structural illumination is used to provide encoding information for the scene.Light field imaging records the direction information of light and the phase information modulated by depth.Phase encoding information provides intensity-insensitive matching features for constructing light field depth cues,and then accurately calculates the scene depth.The experimental results show that compared with passive optical field depth estimation,active optical field imaging method can obtain higher quality scene depth and achieve accurate,accurate and robust optical field depth estimation.2.The folded phase extracted from the fringe signal is ambiguous and usually requires additional coding information for phase unwrapping.In this paper,an absolute phase unwrapping method based on optical field is proposed.Firstly,the folded phase coded field is extracted from the recorded light field under structural illumination,and resampled on different image planes,which correspond to eachcandidate fringe level in the measurement space.Then,the correct fringe order is determined by resampling the phase consistency constraints of the folded phase coded field,and the folded phase is expanded accordingly.This method utilizes the multi-view imaging characteristics of light field to achieve accurate and robust absolute phase unwrapping without additional coding information.