Research On Sparse Acquisition Integral Imaging System

Integral imaging technology is a virtual reality(VR)display technology.Compared with the widely used head-display device based on the binocular parallax principle,the three-dimensional image can be seen by the naked eye without wearing any auxiliary equipment.Integral imaging system includes two parts,which are picking up process and displaying process.Integral imaging system includes one-dimensional integral imaging system and two-dimensional integral imaging system.Two-dimensional integral imaging systems have become the main research direction because they can provide continuous parallax in both horizontal and vertical directions.At present,the problems faced by two-dimensional integral imaging mainly include:1.Directly shooting stereoscopic image arrays requires placing a large number of camera arrays,rendering it time-consuming and error-prone.2.Sparse acquisition can be achieved by the method of obtaining a elemental image array from the sub image array mapping.However,using the horizontal photographing method will generate parallax,and the accuracy of the parallax calculation needs to be improved.At the same time,if the convergence shooting method is adopted,although there is no parallax,since the camera is tilted and placed,the trapezoidal distortion will occur after the perspective transformation,and correction is required.The two-dimensional integral imaging display system mainly includes two stages of acquisition and display.(1)Pick up process:The traditional acquisition method needs to place a large number of camera arrays to shoot the target object.This method is more difficult to realize due to the camera and the shooting environment.3DS MAX is a 3D animation rendering and production software that can be used to simulate the target object,the camera array and render output the pictures in the integral imaging picking up process.It is the commonly used virtual acquisition method.As the number of virtual cameras continues to grow,the difficulty of 3DS MAX rendering output increases,the rendering output process wastes a long time and prone to error.In order to achieve only through a small number of cameras will be able to get the same elemental images picked up by a large number of cameras,a sparse acquisition integral imaging system is required.After obtaining the sub image array,the method of obtaining the elemental image array by MATLAB programming according to the mapping relationship between the sub image array and the elemental image array is obtained.After obtaining the elemental image array,the parallax values between each two adjacent cameras need to be calculated.The fixed-size rectangular windows are used to intercept images to obtain the sub image array according to the parallax values.There is an error in the process of obtaining the parallax,we can improve the accuracy of the parallax calculation.The integral projection method which is commonly used in face recognition and the color segmentation method which is commonly used in license plate recognition are applied to the process of parallax acquisition in the integral imaging system,which greatly improves the accuracy of parallax calculation.(2)Display stage:We build an optical display system composed of a mobile phone screen and a microlens array,and import the elemental image array obtained in the picking up process into the mobile phone.Build an optical display platform,make a combination of the manual translation stage and the slide rail,and place it on the optical display platform,it can be used to control the camera move up and down/left and right accurately to shoot three-dimensional images.The main innovations of this paper are:1.By using the method of HSV spatial color segmentation,the horizontal and vertical integral projections of different color object images are obtained respectively,and the average disparity value is used as the last disparity value to obtain the disparity value.Reduce errors and improve the accuracy of parallax calculations.2.The integral projection method commonly used in face recognition and the color segmentation method commonly used in license plate recognition are applied to the position of the target object in the integral imaging.There is no need to know the parameters such as the distance of the object acquisition stage,and only the information in the image can obtain the parallax.3.An integral imaging optical display platform based on a combination of a mobile phone screen and a microlens array is built to display a stereoscopic image.