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    • 6. 发明授权
    • Methods and apparatus for lossless data hiding
    • 无损数据隐藏的方法和装置
    • US07826638B2
    • 2010-11-02
    • US12098800
    • 2008-04-07
    • Yun Qing ShiGuorong Xuan
    • Yun Qing ShiGuorong Xuan
    • G06K9/00G06K9/36
    • G06T1/0028G06T2201/0052G06T2201/0083G06T2201/0203
    • Methods and apparatus are provided for subjecting an original, pixel domain image to an Integer Wavelet Transform (IWT) to obtain a matrix of wavelet coefficients; selecting at least one bit plane between a least significant bit plane and a most significant bit plane of the matrix of wavelet coefficients; compressing the at least one selected bit plane to produce free space in the at least one selected bit plane; embedding hidden data in the free space of the at least one compressed bit plane; and subjecting the at least one embedded bit plane to an Inverse IWT to produce a marked pixel domain image. Methods and apparatus are also provided for reversing this process.
    • 提供了将原始像素域图像进行整数小波变换(IWT)的方法和装置,以获得小波系数矩阵; 选择小波系数矩阵的最低有效位平面和最高有效位平面之间的至少一个位平面; 压缩所述至少一个所选位平面以在所述至少一个所选位平面中产生自由空间; 将所述隐藏数据嵌入所述至少一个压缩位平面的自由空间中; 以及使所述至少一个嵌入位平面经受反向IWT以产生标记的像素域图像。 还提供了用于逆转该过程的方法和装置。
    • 8. 发明申请
    • REVERSIBLE DATA HIDING
    • 可逆数据隐藏
    • US20100098287A1
    • 2010-04-22
    • US12253825
    • 2008-10-17
    • Guorong XuanYun-Qing Shi
    • Guorong XuanYun-Qing Shi
    • G06K9/00
    • G06T1/0028G06T2201/0051G06T2201/0083G06T2201/0202G06T2201/0203
    • Methods for reversible data hiding are disclosed herein. These methods may be applied to images for reversible image data hiding. In one embodiment, a method for reversible data hiding comprises identifying carrier data having a plurality of components and establishing prediction-errors for each of the components of the carrier data. A first threshold and a second threshold are established. The prediction-errors of the components are evaluated against the first threshold to identify components for possible hiding. The components identified for possible hiding are evaluated against the second threshold to identify components for hiding. To-be embedded data is embedded into the carrier data identified for hiding to create marked data. The marked data is evaluated for overflow or underflow. If overflow or underflow is detected, histogram modification is performed. Marked data is then established.
    • 本文公开了可逆数据隐藏的方法。 这些方法可以应用于可逆图像数据隐藏的图像。 在一个实施例中,一种用于可逆数据隐藏的方法包括:识别具有多个分量的载波数据,并为载波数据的每个分量建立预测误差。 建立第一阈值和第二阈值。 根据第一阈值评估组件的预测误差,以识别可能隐藏的组件。 针对第二个阈值评估可识别的可能隐藏的组件以识别隐藏的组件。 要嵌入的数据嵌入到识别为隐藏以创建标记数据的载体数据中。 对标记数据进行溢出或下溢。 如果检测到溢出或下溢,则执行直方图修改。 然后建立标记数据。