Research On Compressed Holographic Imaging Of 3D Color Object With Partially Occlusion

Since the frequency of light field vibration is too fast,traditional photography can only records the intensity of the measured object by means of the current electronic equipment,the information of phase is lost,the phase,however,contains more information than the amplitude,such as the information of depth etc.The propose of light holography allows the phase information of the light field to be recorded,it usually illuminates the original object by a laser light source with highly coherence,then records with a material such as a holographic plate,and finally imaging illuminated by reproducing light.Light holography also faces many problems,For example,the holographic plate after recording has complicated material processing,and harsh storage environment is needed.Meanwhile,it also faces zero-order diffraction images and interference of twin images,which limits the scope of its application.The development of digital holography solves the problem of traditional optical holography to some extent.It uses image sensor to replace the recording material such as holographic plate,and then transmits the intensity data recorded by the image sensor to the computer for simulation operation to reconstruct original object.Unfortunately,the use of traditional sampling theorem not only causes waste of resources for large acquisition data,but also increases the burden on hardware devices.As a new holographic technology,compressive holography,has attracted much attention in recent years.It combines the theory of compressed sensing with digital holography,and uses the theory of compressed sensing to give a precise signal reconstruction idea with a small amount of measurement.It solves the problems faced by digital holography in the past and greatly improves the efficiency of sampling.The main study work and innovations of this paper are as follows:(1)Compressive holography of partially occluded 3D monochrome object.Considering the vacancy of study on digital holographic reconstruction at a single wavelength for partially occluded 3D objects,Only the study of the reconstruction of a small or transparent 3D object along the optical axis exists,In the subsequent numerical simulations,the axial filling ratio along the optical axis is further increased,and the effectiveness of the method is proved.In the related simulation,the 3D object is divided into 5 layers,and each layer is replaced by a different image.The difference of the random position of the image in each layer and the effect of the image size of each layer on the reconstruction performance is explored in the subsequent work.The robustness of the monochromatic compression holographic reconstruction method for occluded 3D objects in this character is tested under gaussian white noise.(2)Compressive holography of partially occluded 3D color objects.The holographic reconstruction of the partially occluded 3D object at a single wavelength is introduced into the color case,and the reconstruction method of partially occluding the 3D color object is explored by means of the 3DTV model.In the following simulations,two methods for partially occluded 3D color object holographic reconstruction are proposed--holographic reconstruction method based on multi-wavelength illumination and full color holographic reconstruction method,the former has the single color image for each layer of 3D object,and the latter is RGB image for each layer of the 3D object.At first,the related simulations verified the validity by using the 3D self-sparse object reconstruction,and then gave the holographic reconstruction results of the partially occluded 3D color object under the proposed method,and also tested the filling ratio and anti-noise performance.