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    • 2. 发明授权
    • Watermarking of a digitized image
    • 数字化图像的水印
    • US06671387B1
    • 2003-12-30
    • US09621821
    • 2000-07-21
    • Trista ChenWen-Hsing Hsu
    • Trista ChenWen-Hsing Hsu
    • G06K900
    • G06T1/0028G06T2201/0051G06T2201/0083G06T2201/0202
    • A watermarking method and device to embed a digitized watermark into a digital image file in the spatial domain first performs error correction to enhance the robustness of the digital image. The digital image file is first processed such that capacity of each element of the digital image file is calculated. The capacity represents the highest power of element of the watermark that can be added to the related element of the digital file. Elements to which watermark elements may be added are selected and their addresses are stored. Elements of the watermark file are then inserted into the selected addresses in sequence and the watermark is modulated. After the modulation the digitized watermark is embedded into the digital file by distributing the modulated elements of the watermark into the selected addresses.
    • 将数字化水印嵌入到空间域中的数字图像文件中的水印方法和装置首先执行纠错以增强数字图像的鲁棒性。 首先对数字图像文件进行处理,从而计算数字图像文件的每个元素的容量。 该容量表示可以添加到数字文件的相关元素的水印元素的最高功率。 选择可添加水印元素的元素,并存储其地址。 然后将水印文件的元素依次插入所选择的地址,并调制水印。 在调制之后,通过将水印的调制元素分配到所选择的地址中,将数字化水印嵌入到数字文件中。
    • 4. 发明授权
    • Digital watermarking
    • 数字水印
    • US06724913B1
    • 2004-04-20
    • US09666294
    • 2000-09-21
    • Trista ChenWen-Hsing Hsu
    • Trista ChenWen-Hsing Hsu
    • G06K900
    • G06T1/0092G06T1/005G06T2201/0052
    • A watermarking method and device to embed a digitized watermark into a digital image file in the transformation domain is disclosed. In the watermarking technology of this invention, the digitized watermark is first error corrected to enhance its robustness. The digital image file to be embedded with the digitized watermark is first processed such that capacity of each element of the digital image file is calculated. The capacity of an element of the digital image file represents the highest value of tolerance for an element of the watermark to be added to the said element of the digital image file. Elements of the digital image file to which watermark elements may be added are selected and their addresses are recorded. The selected elements are then modulated so that they are suited to be embedded with elements of the digital watermark. After modulation the digitized watermark is embedded into the digital file by distributing the modulated elements of the watermark into the selected addresses. A 3*3 mask is used to calculate the capacity of each element of the digital image file.
    • 公开了一种将数字化水印嵌入到变换域中的数字图像文件中的水印方法和装置。 在本发明的水印技术中,首先纠错数字水印以提高其鲁棒性。 首先对要嵌入数字水印的数字图像文件进行处理,以便计算数字图像文件的每个元素的容量。 数字图像文件的元素的容量表示要添加到数字图像文件的所述元素的水印的元素的最大容差值。 选择可以添加水印元素的数字图像文件的元素,并记录它们的地址。 然后调制所选择的元素,使得它们适于嵌入数字水印的元素。 调制后,通过将水印的调制元素分配到所选择的地址中,将数字化水印嵌入到数字文件中。 使用3 * 3掩码来计算数字图像文件的每个元素的容量。
    • 6. 发明申请
    • GRAPHICAL SYSTEM AND METHOD FOR USER AUTHENTICATION
    • 图形系统和用户认证方法
    • US20100058437A1
    • 2010-03-04
    • US12202118
    • 2008-08-29
    • Bee Yian LiewTrista ChenVolker Roth
    • Bee Yian LiewTrista ChenVolker Roth
    • H04L9/32G06F3/048
    • G06F21/36
    • System and method for graphical user authentication using compact collages of regions of images. Image corpus is constructed by selecting similar quality images and filtering to further homogenize image quality. Regions are detected within the images and scored according to similarity and neighborhood information. Regions with lower scores provide less information about other regions and are more secure secrets. During enrollment, user selects secret images; decoy images are chosen by the system accordingly. Regions from secret images are selected as secrets according to the scoring of regions and regions from decoy images are selected as decoys. A collage is formed with secrets and decoys. Compact rendering enhances security and is suitable for small displays of mobile devices. Several rounds of challenge, requiring identification of secrets, are presented to the user. User is authenticated if a certain number of correct identifications of secrets within a number of rounds are achieved.
    • 图像用户认证的系统和方法使用图像区域的紧凑拼贴。 通过选择相似质量的图像和滤波来进一步均匀化图像质量来构建图像语料库。 在图像内检测区域,并根据相似度和邻域信息进行划分。 分数较低的地区提供较少的其他地区信息,更安全的秘密。 在注册期间,用户选择秘密图像; 相应地,系统选择诱饵图像。 选择秘密图像的区域作为秘密,根据诱饵图像区域和区域的评分被选为诱饵。 拼贴形成了秘密和诱饵。 紧凑的渲染增强了安全性,适用于移动设备的小型显示器。 向用户呈现了几轮挑战,需要识别秘密。 如果达到若干轮次内的一定数量的正确的秘密标识,则认证用户。
    • 8. 发明授权
    • Graphical system and method for user authentication
    • 用于用户认证的图形系统和方法
    • US08086745B2
    • 2011-12-27
    • US12202118
    • 2008-08-29
    • Bee Yian LiewTrista ChenVolker Roth
    • Bee Yian LiewTrista ChenVolker Roth
    • G06F15/16G06F21/00
    • G06F21/36
    • System and method for graphical user authentication using compact collages of regions of images. Image corpus is constructed by selecting similar quality images and filtering to further homogenize image quality. Regions are detected within the images and scored according to similarity and neighborhood information. Regions with lower scores provide less information about other regions and are more secure secrets. During enrollment, user selects secret images; decoy images are chosen by the system accordingly. Regions from secret images are selected as secrets according to the scoring of regions and regions from decoy images are selected as decoys. A collage is formed with secrets and decoys. Compact rendering enhances security and is suitable for small displays of mobile devices. Several rounds of challenge, requiring identification of secrets, are presented to the user. User is authenticated if a certain number of correct identifications of secrets within a number of rounds are achieved.
    • 图像用户认证的系统和方法使用图像区域的紧凑拼贴。 通过选择相似质量的图像和滤波来进一步均匀化图像质量来构建图像语料库。 在图像内检测区域,并根据相似度和邻域信息进行划分。 分数较低的地区提供较少的其他地区信息,更安全的秘密。 在注册期间,用户选择秘密图像; 相应地,系统选择诱饵图像。 选择秘密图像的区域作为秘密,根据诱饵图像区域和区域的评分被选为诱饵。 拼贴形成了秘密和诱饵。 紧凑的渲染增强了安全性,适用于移动设备的小型显示器。 向用户呈现了几轮挑战,需要识别秘密。 如果达到若干轮次内的一定数量的正确的秘密标识,则认证用户。