Research On Rapid Reconstruction Technology Of Carrier Interferogram With GPU

Carrier interference digital holography has become an important method widely used in the measurement of three-dimensional topography of objects because of its non-contact and without special treatment of samples.Especially the work can be completed through one interference image.Phase reconstruction is a key part in carrier digital holography.Because the process is complex and time-consuming,usually,it is off-line processing,which cannot meet the needs of real-time measurement.Therefore,how to improve the time of the carrier digital holography process is the focus of the research recently,which has an important academic value and practical significance.In this paper,the research focused on the problem that the reconstruction speed of the thick phase object whose phase is beyond the range of [-?,?] is slow.Through the analysis of the phase reconstruction algorithm by using the method of eliminating the presence and absence of sample interferometer and the phase unwrapping algorithm based on the discrete cosine transform(DCT)to achieve the rapid reconstruction of thick phase objects.Then,they are transplanted into the GPU in order to realize real-time processing.The research provides a new method for the further development of carrier interference digital holography,and has broad application prospects.Based on the basic theory of carrier interference digital holography,this paper focuses on the principle of the phase reconstruction and unwrapping.Then,the paper determines the phase reconstruction algorithm by using the method of eliminating the presence and absence of sample interferometer and the phase unwrapping algorithm based on the discrete cosine transform(DCT)to achieve the basis for the rapid reconstruction of the carrier interference image through the simulation and experimental analysis to verify the effectiveness and feasibility of the method used.After the determination of the feasibility of the algorithm,they are be designed in parallel and transplanted to the GPU to achieve the reconstruction process of the carrier interference image.Firstly,GPU-based fast Fourier transform and circular filtering algorithm are implemented to verify that the GPU can effectively accelerate the image processing capability.Secondly,the phase reconstruction algorithm and the DCT-based least-squares phase unwrapping algorithm are transplanted into the GPU platform,and then theparallelization of the phase processing of the thick phase carrier interference image is obtained.By comparing the running time of the GPU and the CPU,it is verified that the GPU implementation can effectively improve the real-time performance of the image phase processing and complete the fast reconstruction of the carrier interference image.In order to meet the actual engineering needs an application software is designed to achieve the rapid reconstruction of carrier interference image with GPU in the Windows 7system and Visual Studio 2013 software development platform.In addition,user interface is made in order to make it easier for users to use this software.