Research On 3D Light Field Display Technology Based On Dynamic Backlight

At present,with the continuous development of software and hardware in the display field,a series of display models and display algorithms are constantly emerging.Among them,the impact and shock that three-dimensional display brings to people has made people's research enthusiasm in the field of three-dimensional display rising.However,the traditional naked-eye 3D display method not only cannot solve the conflict of convergence and divergence adjustment,but also cannot solve the problem of fast switching between 3D and 2D display.How to use rendering algorithms combined with optical systems to produce better three-dimensional display effects has always been a research hotspot in the field of three-dimensional display.The multi-layer light field display studied in this paper is one of the ways to solve these problems.The display principle based on the reconstructed light field information can solve the problem of convergence and divergence adjustment conflict,and the multi-layer design can also realize the fast switching between 3D and 2D display.However,there are still problems that the model is not reasonable and the algorithm is not suitable,such as the contradiction between the number of layers of multi-layer display and the display effect,that is,the more layers,the smaller the crosstalk and error of the three-dimensional display,but the effective utilization of light Will decrease,the brightness and contrast of the display will decrease;the contradiction between the amount of light field data and the processing speed,that is,the larger the spatial resolution and angular resolution of the light field that need to be reconstructed,the more processing time and hardware resources are required.Therefore,in view of the advantages and disadvantages of traditional 3D display and in order to improve the realism and immersion of multi-layer light field display,this thesis has carried out innovative research on the optimization of 3D light field display model and algorithm implementation based on dynamic backlight.The main innovations of the thesis are as follows:1.Proposed the multi-layer light field display model based on dynamic backlight,which effectively solves the problem of the contradiction between the display effect and the number of display layers in the multi-layer light field display.Utilizing the characteristics that dynamic backlight can act as both a backlight layer and a display layer,the ordinary backlight layer and the last light attenuation layer are combined into one.Compared with the previous multi-layer light field display model,this model not only reduces the complexity of the entire model,but also improves the display effect.2.Proposed the use of non-negative tensor factorization to realize the multi-layer light field display algorithm based on dynamic backlight,which solves the algorithm realization problem of multi-layer light field display.Compared with non-negative matrix factorization,non-negative tensor factorization can provide a sparse basis with a multi-linear structure,which makes it more advantageous for data processing in the tensor domain.Compared with data dimensionality reduction algorithms such as principal components analysis and vector quantization,the data involved in non-negative tensor factorization are all non-negative physical quantities of practical significance,which makes it more advantageous in the light field display domain.Simulations and experiments show that the algorithm can achieve light field reconstruction and three-dimensional display regardless of whether it is a multi-layer light field display model based on ordinary backlight and dynamic backlight.3.Proposed the use of convolutional neural network to realize a multi-layer light field display algorithm based on dynamic backlight,which improves the processing speed of the algorithm and provides the possibility of real-time multi-layer light field display.Although the non-negative tensor factorization algorithm can achieve multi-layer light field display,its update method is still the traditional iterative method,and the time required is still long.In order to improve the processing speed of multi-layer light field display,an algorithm model based on convolutional neural network is proposed.A variety of convolutional neural networks with different hidden layer structures are designed to solve the problem of light field display model based on ordinary backlight or dynamic backlight,using less training parameters and time to achieve almost the same effect.The algorithm is improved and applied to a multi-layer light field display model with a larger field of view.At this time,the reconstruction and display effect is still excellent.Simulation and experimental results show that the algorithm can quickly and effectively realize light field reconstruction and multi-layer light field display.