Method for making synthetic hologram

Abstract

The invention discloses a method for making a synthetic hologram, which comprises the following steps of: sampling, and acquiring M images, of different visual angles, of a three-dimensional object or a partial region of the three-dimensional object; performing the following processing on the M images: grouping the M images into a first image sequence, splitting each image in the first image sequence into N longitudinal image columns, extracting an image column from each image in the first image sequence to form a new image, and then obtaining a second image sequence with N images; and sequentially outputting the processed images through a spatial light modulator, and recording the processed images to N narrow and long regions of a holographic dry plate to obtain the synthetic hologram of the three-dimensional object or the partial region of the three-dimensional object.

Description

technical field [0001] The invention relates to the field of holographic technology, in particular to a method for making a synthetic hologram. Background technique [0002] At present, holography can record and reproduce all optical information of objects, and its application in optical stereoscopic display has important research value. As one of its branches, synthetic holographic technology not only utilizes the idea of ​​stereoscopic image synthesis for stereoscopic images, but also utilizes the characteristics of holography that can reproduce the original light diffraction. It has flexible production methods, rich shooting themes and strong It can achieve high-quality stereoscopic scene optical display in a simple reproduction form. [0003] Since the 1990s, how to make large-area full-color digitally synthesized holograms has become one of the hotspots in the research of display holograms all over the world. At present, many scientific research institutions and compa...

AI Technical Summary

Problems solved by technology

However, similar foreign equipment and related technologies are strictly kept secret, and the price is quite expensive

A set of digital hologram production equipment costs more than 300,000 US dollars, and the cost of making a hologram of 1 meter by 1 meter is as high as tens of thousands of dollars

[0004] At present, there are generally two methods for making synthetic holograms in China. One is to use the known Fresnel hologram and white light reproduction reflection or rainbow hologram to shoot the optical path, and shoot the known two-step white light reproduction hologram. When the image area is large (for example, larger than the current common holographic dry plate size of 25cm×20cm), the requirements for equipment are very high, such as high-power lasers, large-diameter optical lenses, etc., making the optical path too long and too large, and the production equipment is heavy and expensive. Very expensive, equipment and technically difficult to implement

In addition, in the traditional two-step composite holographic shooting method, the sampled image is directly shot on the holographic dry plate behind the slit or rectangular hole. When reproducing, the observer cannot see a complete two-dimensional perspective image, but The overlapping of multiple two-dimensional perspective images from various angles will cause the observer to see a completely chaotic image, resulting in poor quality synthetic holograms

The second is to use the existing dot-matrix lithography machine to make a molded hologram with a large area. However, the biggest disadvantage of this method is that it can only make simple images, such as changing geometric stripes and simple gratings, etc., which is difficult to produce. To achieve a three-dimensional effect, high-quality holographic display cannot be achieved, so it is mainly used to manufacture large-format holographic packaging materials, etc.

Generally speaking, there is still a big gap between China and developed countries in terms of large-area synthetic holographic display shooting technology

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