![]() Therefore, if trying to faithfully reproduce the distribution of intensity of diffraction light, it is necessary that the display device not only be able to perform modulation of the amplitude (amplitude modulation), but also be able to perform modulation of the index of refraction (phase modulation). The same holds true for both one-dimensional and two-dimensional holographic stereograms. If finding the modulation values by the above-mentioned conventional methods by performing a Fourier transform or discrete Fourier transform, in general since the Fourier transform (F(ω)) of (x) is expressed by #EQU1# not only the real component, but also the imaginary component appears. (b) The method of using discrete Fourier transform by making discrete the distribution of intensity of diffraction light with respect to the angle (angle from the center of an element hologram to points in a block AB). (a) The method using Fourier series expansion and By irradiating these element holograms with coherent light, the stereoscopic image is visually reproduced.Īs explained later in detail, the conventional methods for calculating the modulation values (pattern) to be loaded to the element holograms to realize a computer generated one-dimensional holographic stereogram are: Each of these element holograms is loaded with a unique modulation value corresponding to the stereoscopic image to be reproduced. Holographic stereograms are comprised of an array of a plurality of element holograms. One of the technologies now being widely researched with the aim of visually reproducing stereoscopic images is holographic stereograms. The present invention relates to a holographic stereogram. A holographic stereogram as set forth in claim 2, wherein the element holograms are loaded with modulation values comprised of two-dimensional sine transform coefficients and are arranged two-dimensionally for realization of a computer-generated two-dimensional holographic stereogram. A holographic stereogram as set forth in claim 2, wherein the element holograms are loaded with modulation values comprised of one-dimensional sine transform coefficients and are arranged in one direction for realization of a computer-generated one-dimensional holographic stereogram.ħ. A holographic stereogram as set forth in claim 4, wherein said compensation amount is revised in accordance with variations in the distance between the element hologram and the point of sight.Ħ. A holographic stereogram as set forth in claim 2, wherein in each element hologram, compensation is applied in advance so that the degree of modulation of the index of refraction gradually changes along with the increase of the distance from the center.ĥ. A holographic stereogram as set forth in claim 2, wherein if the number of samples for each of said element holograms is N (N being a positive integer), an N number of said sine transform coefficients and another N number of sine transform coefficients which are obtained by rearranging or inverting said sine transform coefficients are both produced over 2N modulation components and are loaded on said display device.Ĥ. A holographic stereogram as set forth in claim 1, further comprising a display device which can spatially modulate light intensity, and in which amplitudes of light displayed on said display device are changed in accordance with the modulation values corresponding to the element holograms.ģ. Irradiating means for reproducing said steroscopic image by irradiating the element holograms with coherent light, whereinĮach of said element holograms is created by corresponding said unique modulation value defined by sine transform coefficients, in which the sine transform coefficients are specified by a sine transform or discrete sine transform of the distribution of intensity of diffraction light expressing the steroscopic image to be reproduced.Ģ. ![]() Hologram means comprises of an array of a plurality of element holograms each loaded with a unique modulation value corresponding to the stereoscopic image to be reproduced and ![]()
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