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Color watermark preparation method based on kinoform

A kinoform and color technology, applied in image data processing, image data processing, instruments, etc., can solve problems such as poor security, achieve the effect of improving quality and reducing modification

Active Publication Date: 2015-03-11
PEKING UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

However, the traditional kinoform is easy to make and has poor security.

Method used

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  • Color watermark preparation method based on kinoform
  • Color watermark preparation method based on kinoform
  • Color watermark preparation method based on kinoform

Examples

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Embodiment Construction

[0026] Taking the original carrier image as Lena (256 × 256) and the watermark information as the Peking University emblem icon (64 × 64) as an example, the color watermark preparation method based on the kinoform of the present invention includes:

[0027] 1) Convert the original color carrier image and color watermark information to RGB space for processing and calculation.

[0028] JPEG uses the YCrCb color space, while BMP uses the RGB color space. If you want to compress BMP pictures, you need to convert the color space first. In the YCrCb color space, Y represents brightness, Cr and Cb represent chroma and saturation (some people also refer to Cb and Cr as chroma), and the three are usually represented by Y, U, V, that is, U represents Cb, use V to represent Cr. The conversion relationship between RGB and YCrCb is as follows:

[0029] R=Y+1.402(Cr-128)

[0030] G=Y-0.34414(Cb-128)-0.71414(Cr-128)

[0031] B=Y+1.772(Cb-128)

[0032] 2) According to the non-cascade it...

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Abstract

The invention discloses a color watermark preparation method based on kinoform. In the method, kinoform is applied in color watermark technology; compared with conventional color watermark technology, no reference light is led in during reproduction of kinoform, so that a single reproduction image can be acquired during reproduction; a random phase secret key is added, so that safety of watermark information is improved; due to own characteristics of kinoform, both robustness and safety can reach high level.

Description

technical field [0001] The invention provides a color watermark scheme based on a kinoform, and specifically relates to related methods such as making a kinoform, discrete wavelet transform, and the like. technical background [0002] In 1993, Tirkel et al. proposed digital watermarking technology and published the first article on watermarking entitled "Electronic watermark" at an international academic conference. An algorithm for embedding a watermark into the least significant bits of an image. [0003] In 1968, J.A.Jordan proposed the kinoform for early three-dimensional object display, especially suitable for displaying the shape of objects whose mathematical description is known but does not actually exist. The kinoform can also be used as a filter for information processing of incoherent light; it can also be used as a kinoform lens. In the multi-plane processing system for optical transformation, the phase element of the kinoform is used, which has the characteris...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 杨光临赵超亚
Owner PEKING UNIV
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