超多视点的大视角光场三维显示方法

Light Field Three-Dimensional Display with Super Multiple Viewpoints and Large Viewing Angle

针对传统自由立体显示技术视点数目少和视角窄的问题,提出一种超多视点的大视角光场三维(3D)显示方法。基于集成成像全视差光场构建原理,该方法利用大节距的非连续柱透镜阵列(DLLA)以特定的水平方向角将基元图像(EI)中所有平面像素发出的光线进行水平调制,在大视角范围内构建出水平方向密集排列的超多视点。此外,对DLLA进行光学成像优化设计以抑制像差,保证高质量3D成像。在实验部分,利用分辨率为1280pixel×720pixel的54inch(1inch=2.54cm)发光二极管(LED)显示器实现了视角为42.8°、视点数目为100的水平光场3D显示效果,且3D成像的畸变率为2.23%,呈现的3D影像具有连续的运动视差和自然的深度信息表达,这些结果验证了本文方法的优越性和可行性。

In order to solve the problems of insufficient viewpoints and narrow viewing angle of the traditional autostereoscopic display technology,a light field three-dimensional(3D)display method with super multiple viewpoints and large viewing angle is proposed.Based on the principle of reconstructing full-parallax light field for integral imaging,the discrete lenticular lens array(DLLA)with a large pitch is used in the proposed method to horizontally modulate the light rays,which emit from pixels of the elemental image(EI),with specific horizontal direction angles to integrate viewpoints in space.As a result,super multiple viewpoints densely arranged in the horizontal direction are reconstructed within a large viewing angle.In addition,the DLLA is optimized for optical imaging to suppress aberrations and ensure high-quality 3D imaging.In the experiment,a 54-inch(1 inch=2.54 cm)light-emitting diode(LED)displayer with a resolution of 1280 pixel×720 pixel is used to achieve a horizontal light field 3D display effect with 42.8°viewing angle and 100 viewpoints,and the distortion rate of 3D imaging is 2.23%.The presented 3D image with continuous parallax of motion and natural expression of depth information verifies the superiority and feasibility of the proposed method.