Investigation Of Full-parallax Holographic Stereogram Using The One-step Laser Writing Method

With the rapid development of the computer technology and the new digital equipment, digital image stereography became a research focus in the field of holographic display technology because of its wide materials. In order to make holographic display technology better commercial, since 90s the twentieth century, how to make a large scale and full parallax hologram became a worldwide research focus in the field of holographic display. At present several foreign research institutions and companies have dedicated to the manufacture and application of synthesis holograms. And holograms, as a high quality three-dimensional display media, have been put into commercial market. In China, the related technologies are somehow backward. To shorten the gap between domestic and foreign, this thesis introduced a method which can achieve automatic shooting of white reproduction, large viewing zone, full-parallax synthesis holograms on the base of referring to cutting edge technology. In other word, it is a laser printing technology of three-dimensional synthesis hologram.The thesis based on the principle of stereogram hologram, used the method of one-step laser writing, combined with the digital image processing technology, make it possible to achieve automatic shooting of synthesis holograms, and make the achieved holograms have a large viewing zone to meet the need of large-scale splicing. Because one single two-dimensional image is directly recorded on a unit point, however while reproducing, observers's eyes are far away from hologram surface, and thus can not see a complete original image. To solve this problem, the information on the images should be segment and regroup,in order for the observers to see the whole picture of the original image by a synthesis way. The method contains four steps: Firstly, make a holographic optical element according to the need of the experiment. Secondly, make a model and render a group of two-dimension picture in sequence. Thirdly, segment and regroup the pictures and get a new two-dimension picture group in sequence by the image processing program. Fourthly, shoot the full parallax synthesis hologram.The main points of this thesis:according to the need of experiment make a holographic optical element; design the program for segmenting and regrouping the picture; at last, finish the producing of the full-parallax hologram. By doing the experiment, digital image synthesis hologram with a 57°viewing zone are attained. The hologram can be reproduced under the white light, and can be use as a high quality stereo display media.The experiment shows that this method is more fit for to the synthesis holograms's automated and industried production, and as a holographic display technology, is very feasible. This experiment proved the feasibility of laser direct writing of full-parallax synthesis holograms, provides a reliable basis for making true color and full-parallax hologram. This method has practical significance, to solve the problem of fully automatically shooting of the large-area, large viewing zone, full-parallax synthesis hologram, and to catch up with the world's advanced level in the field of large-scale synthesis holographic display.