Methods and apparatus for hiding data in halftone images
    91.
    发明授权
    Methods and apparatus for hiding data in halftone images 有权
    在半色调图像中隐藏数据的方法和装置

    公开(公告)号:US07804977B2

    公开(公告)日:2010-09-28

    申请号:US11508410

    申请日:2006-08-22

    IPC分类号: G06K9/00

    摘要: We propose methods for generating a halftone image, in which each pixel takes one of two tone values. The generated image contains hidden data, which is present at data storage pixels chosen using a pseudo-random number generator. In a first case, the data is hidden within an existing halftone image by reversing the tone value at certain of the data storage pixels, and at pixels neighboring the data storage pixels. In a second case, the halftone image is generated from a grey-scale image, and data is hidden during this conversion process.

    摘要翻译: 我们提出了生成半色调图像的方法,其中每个像素采用两个色调值之一。 生成的图像包含存在于使用伪随机数生成器选择的数据存储像素处的隐藏数据。 在第一种情况下,通过反转某些数据存储像素处的色调值和与数据存储像素相邻的像素,将数据隐藏在现有的半色调图像内。 在第二种情况下,从灰度图像生成半色调图像,并且在该转换处理期间数据被隐藏。

    Methods and apparatus for hiding data in halftone images
    92.
    发明授权
    Methods and apparatus for hiding data in halftone images 失效
    在半色调图像中隐藏数据的方法和装置

    公开(公告)号:US07058199B1

    公开(公告)日:2006-06-06

    申请号:US09638014

    申请日:2000-08-14

    IPC分类号: G06K9/00

    摘要: We propose methods for generating a halftone image, in which each pixel takes one of two tone values. The generated image contains hidden data, which is present at data storage pixels chosen using a pseudo-random number generator. In a first case, the data is hidden within an existing halftone image by reversing the tone value at certain of the data storage pixels, and at pixels neighboring the data storage pixels. In a second case, the halftone image is generated from a grey-scale image, and data is hidden during this conversion process.

    摘要翻译: 我们提出了生成半色调图像的方法,其中每个像素采用两个色调值之一。 生成的图像包含存在于使用伪随机数生成器选择的数据存储像素处的隐藏数据。 在第一种情况下,通过反转某些数据存储像素处的色调值和与数据存储像素相邻的像素,将数据隐藏在现有的半色调图像内。 在第二种情况下,从灰度图像生成半色调图像,并且在该转换处理期间数据被隐藏。