CN1141639C - 基于整数小波的无损图象数字水印方法 - Google Patents
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- CN1141639C CN1141639C CNB021116296A CN02111629A CN1141639C CN 1141639 C CN1141639 C CN 1141639C CN B021116296 A CNB021116296 A CN B021116296A CN 02111629 A CN02111629 A CN 02111629A CN 1141639 C CN1141639 C CN 1141639C
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T1/00—General purpose image data processing
- G06T1/0021—Image watermarking
- G06T1/0028—Adaptive watermarking, e.g. Human Visual System [HVS]-based watermarking
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Abstract
Description
步骤 | 操作 | 作用 |
1 | 编写第一次灰度直方图调整程序,对原始图象直方图进行统计,去除左右灰度,留下直方图主体。 | 使反变换时灰度不溢出(仍在0-255之间) |
2 | 编写小波正变换程序,将直方图主体的空间域图象,变换成小波域图象 | 利用小波域多分辨和去除图象相关性特性,达到无损目的 |
3 | 在小波域嵌入数据:采用算术编码,对原位平面数据压缩。选择位平面嵌入:上述压缩数据、待传送数据和第一次灰度直方图调整的灰度边带数据,用哈希函数编制的程序,进行密钥嵌入。 | 嵌入数据到最高分辨率区域的较低位平面(如第5位平面)密钥的嵌入除加密外,还可对防止溢出作微调 |
4 | 编写小波反变换程序,将小波域图象,变换成空间域图象 | 整数提升小波反变换,有利于数据和图象恢复,无损变换 |
5 | 第二次灰度直方图变换,形成加水印图象,调用数字图象处理软件,对直方图灰度进行左右循环移位调整。 | 调整信号噪音比PSNR,循环移位使直方图均值靠近原始图象的均值,并保持无损 |
步骤 | 操作 | 作用 |
6 | 第三次灰度直方图逆变换:调用采用了与第二次灰度直方图变换相反的方法的软件,获得与第五步直方图相反的循环位移。 | 反循环移位,目的是恢复 |
7 | 小波正变换:调用与第四步相同的小波变换软件进行变换,将空间域变换成小波域。 | 目的是使第八步的解密和提取数据在小波域内进行,达到无损。 |
8 | 解密,提取数据:采用算术编码提取传送数据和第一次灰度直方图调整的灰度边带数据,从指定分辨率区域的指定位平面提取数据。用哈希函数解密。 | 从嵌入数据到最高分辨率区域的指定位平面提取数据,最后恢复小波域的位平面数据。 |
9 | 小波反变换:调用小波变换程序,将小波域图象,变换成空间域图象。 | 整数提升小波变换,达到无损恢复。 |
10 | 第四次直方图变换处理:调用采用了与第一次灰度直方图变换相反的程序,恢复原来的图象 | 恢复原来灰度直方图,恢复原来的图象 |
步骤 | 操作 | 说明 |
1 | 第一次灰度直方图调整中,取30个出现最少的灰度,进行合并,使直方图中,30个灰度为零,一半在左边,一半在右边 | 256×256Lena图象256级灰度(在0-255之间)第一次灰度直方图调整前,灰度直方图均值为118.62第一次灰度直方图调整后,灰度直方图均值变为123.62 |
2 | 小波变换 | “提升(Lifting)”整数小波正变换,无损 |
3 | 嵌入数据和密钥:其中包括:待传送数据和第一次灰度直方图调整的灰度边带数据 | 嵌入数据到最高分辨率区域(s=3×256×256)的较低位平面(第5位平面)密钥:哈希函数y=(k0+kx)mod(s)为y=(1030+289x)mod(3×256×256) |
4 | 小波反变换 | “提升”整数小波反变换,无损恢复。在小波域嵌入数据,并反变换后,灰度不溢出(仍在0-255之间)第二次灰度直方图调整前,灰度直方图均值为123.62 |
5 | 第二次灰度直方图调整 | 循环左移5位,PSNR从32.21提高到36.64,而且与原始图象更一致第二次灰度直方图调整后,灰度直方图均值恢复为118.62 |
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Lena | 85507 |
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Baboon | 14916 |
名称 | 容量 |
Tiffany | 89848 |
Sailboat | 44086 |
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Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2004066204A1 (en) * | 2003-01-22 | 2004-08-05 | Koninklijke Philips Electronics N.V. | Perceptible reversible watermarks |
CN100346322C (zh) * | 2003-10-10 | 2007-10-31 | 刘彤 | 基于数字水印技术的数字图像复原方法 |
KR101003813B1 (ko) * | 2004-03-26 | 2010-12-28 | 뉴저지 인스티튜트 오브 테크놀로지 | 정수형 웨이브렛 스펙트럼 확산을 기초로 한 가역적 데이터은닉을 위한 시스템 및 방법 |
CN1326383C (zh) * | 2004-06-30 | 2007-07-11 | 佳能株式会社 | 图像处理设备和方法 |
CN100394443C (zh) * | 2006-07-07 | 2008-06-11 | 中山大学 | 一种用于图像认证的可逆水印方法 |
CN100385459C (zh) * | 2006-07-11 | 2008-04-30 | 电子科技大学 | 一种基于有限脊波变换的图像水印方法 |
CN100452091C (zh) * | 2007-03-30 | 2009-01-14 | 西安电子科技大学 | 基于图像特征区域的抗几何攻击数字水印方法 |
CN100461213C (zh) * | 2007-04-05 | 2009-02-11 | 上海交通大学 | 具有区域选择性的无损数字水印方法 |
US8144985B2 (en) * | 2007-12-21 | 2012-03-27 | Sony Corporation | Method of high dynamic range compression with detail preservation and noise constraints |
CN101990681B (zh) * | 2008-02-01 | 2012-11-21 | 新泽西理工学院 | 利用游程直方图修改和逻辑运算进行可逆二进制图像数据隐藏的系统和方法 |
CN101661605B (zh) * | 2008-08-26 | 2012-07-04 | 浙江大学 | 一种数字水印的嵌入、定位篡改方法及装置 |
CN101527037B (zh) * | 2009-04-13 | 2011-05-04 | 天津大学 | 基于邻域加窗的平稳小波图像去噪方法 |
CN101527041B (zh) * | 2009-04-22 | 2011-03-30 | 天津大学 | 基于shadow matte一致性的图片伪造检测方法 |
CN102262773A (zh) * | 2010-05-29 | 2011-11-30 | 深圳宝嘉电子设备有限公司 | 双阈值的图像无损数据嵌入方法 |
CN111444486B (zh) * | 2019-12-31 | 2022-03-22 | 深圳贝特莱电子科技股份有限公司 | 一种基于android系统的开机自适应初始化指纹参数方法 |
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