Hologram reproduction image processing apparatus and processing method

Abstract

A holographic reproduction image processing apparatus includes: a detecting section detecting the luminance of a plurality of pixels in an area of a holographic reproduction image extending in a direction substantially orthogonal to a direction in which the image has luminance variation; and an image processing section correcting the luminance variation according to luminance information supplied from the detecting section.

Description

technical field [0001] The invention relates to a holographic regeneration image processing device and a holographic regeneration image processing method. Background technique [0002] Holograms are used for authentication of credit cards, ID cards, etc., because holograms can be displayed as three-dimensional images of these objects. In practice, embossed holograms with surface irregularities recorded using interference films are widely used. However, embossed holograms have a problem that they are easily counterfeited. In contrast, it is difficult to forge a Lippmann hologram obtained by recording an interference film as a difference in refractive index inside the film. The reason is that an advanced technique is required to make an image to be recorded, and it is difficult to obtain a recording material. Lippmann holograms are classified into laser holograms obtained by irradiating an object with laser light and holographic stereograms recorded based on parallax images...

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Problems solved by technology

[0006] However, due to the stability of the laser light used for reproduction and the shrinkage of the recording material, the holographic reproduced image is subject to brightness variation, and thus errors occur when the image is read

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