Method and device for 3-D display based on random constructive interference

Abstract

The present invention relates to a method and an apparatus for 3-D display based on random constructive interference. It produces a number of discrete secondary light sources by using an amplitude-phase-modulator-array, which helps to create 3-D images by means of constructive interference. Next it employs a random-secondary-light-source-generator-array to shift the position of each secondary light source to a random place, eliminating multiple images due to high order diffraction. It could be constructed with low resolution liquid crystal screens to realize large size real-time color 3-D display, which could widely be applied to 3-D computer or TV screens, 3-D human-machine interaction, machine vision, and so on.

What is claimed is: 
     
       1. A method for 3-D photography performed by a processor employing a 3-D display method based on random constructive interference, comprising following steps:
 A: Following the 3-D display method based on random constructive interference, generate voxels in 3-D space using a coherent point light source array in which the positions of point light sources are of a uniform random distribution; 
 B: Read in an image from a conventional camera focused on position of the voxels generated in step A; 
 C: Repeat step A through step B so that the voxels generated in step A scan through a 3-D space, meanwhile analyze the images read in step B; record positions of the voxels as local 3-D coordinates of a surface when voxels' image sizes become minima; meanwhile record colors and brightness of the image as colors and brightness of the surface of an object. 
 
     
     
       2. The method of  claim 1 , where in step C: record positions of the voxels as local 3-D coordinates of a surface when voxels' image sizes become minima; meanwhile turn off the voxels generated in step A, read in another image from the conventional camera and take colors and brightness of the image as colors and brightness of the surface of an object. 
     
     
       3. A method for 3-D human machine interaction performed by a processor employing a 3-D display method based on random constructive interference, comprising following steps:
 A: Following the 3-D display method based on random constructive interference, generate voxels in the air using a coherent point light source array in which the positions of point light sources are of a uniform random distribution; said voxels form up a number of control elements in the air. 
 B: Read in an image from a conventional camera focused on the position of the voxels generated in step A; 
 C: Repeat step A through step B, meanwhile analyze the images read in step B; when some voxels' image sizes become minima issue a massage indicating a control element represented by the voxels whose image sizes become minima is being touched.