Holographic projection real-time 3D display system and method

A holographic three-dimensional (3D) display method, comprising:

• a photo capturing process of holographic 3D image information, a projective restoration process of real-time holographic image information, and a limited stretching process of a holographic functional screen;
• wherein
• the photo capturing process comprises the following steps:
• M×N color 2D image capturing units Cmn are used to sample and capture M×N spatial spectrums on any spatial spectrum surface S of an object O to be displayed in a 3D manner, each sample point Smn corresponds to a hoxel Hmn of the object O, information captured by each image capturing unit Cmn is equivalent to a spatial spectrum view Imn corresponding to the hoxel Hmn, so that M×N arrays of sample spatial spectrum image information of the object O are acquired, the M×N color 2D image capturing units Cmn are arranged on the spatial spectrum surface S according to preset spatial sampling angles ωmn, imaging optical axes thereof are anchored to a same reference point R of the space corresponding to the object O, and each image capturing unit focuses on a visible surface of the object O in the corresponding spatial spectrum direction to acquire the clear view in the direction;
• the projective restoration process comprises the following steps:
• M×N color 2D image projection units Pmn are respectively used to simultaneously project the captured corresponding array sample view at the M×N hoxels Hmn to a reference surface PR in a restoration space corresponding to the original object O according to corresponding anchor relationships during the capturing, and make a projective pattern of each projective view image on the reference surface be consistent with a spatial spectrum view Imn of the original object O in the direction, the M×N color 2D image projection units Pmn are arranged on a corresponding surface S′ of the spatial spectrum surface S in a restoration space according to the spatial sampling angles ωmn same as those during the capturing, and imaging optical axes of the projection units Pmn are anchored on a corresponding point R′ of the reference point R in the restoration space;
• M, N, m, and n are natural numbers, and at least one of M and N is greater than 2;
• the holographic functional screen has regularly distributed fine spatial structures, which distribution makes an input light beam that has reached the holographic functional screen in any direction to have a corresponding spectrum spatial stretching output, wherein a spatial stretching angle of an output light beam is the spatial sampling angle ωmn necessary for restoring a specific spatial 3D information;
• the limited stretching process of the holographic functional screen comprises the following steps:
• the holographic functional screen is placed on the reference surface PR, so as to perform a stretching corresponding to the spatial sampling angles ωmn on input information of the view carried in each single spatial spectrum view Imn, so that after the stretching, output spatial spectrum distributions of the views Imn are connected to each other, but do not overlap, thereby ensuring that a spatial spectrum of the restored 3D spatial information is restored and output continuously and completely, that is, for each hoxel Hjk on the holographic functional screen, a stretching angle of a spatial unidirectional input light beam is exactly the spatial sampling angle ωmn, thereby using a captured complete spatial spectrum of the object O to restore 3D display of the object.