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    • 1. 发明授权
    • Method and associated apparatus for encoding bitplanes for improved
coding efficiency
    • 用于编码位平面的方法和相关设备,以提高编码效率
    • US5442458A
    • 1995-08-15
    • US809364
    • 1991-12-18
    • Majid RabbaniPaul W. Melnychuck
    • Majid RabbaniPaul W. Melnychuck
    • H03M7/30H04N1/41H04N7/26H04N1/00
    • H04N1/41
    • An encoding method is described for image bitplanes whereby an arithmetic coder using conditioning contexts based on pixels from both the current bitplane and previously decoded bitplanes is employed. For the same number of contexts (which is important for minimizing memory usage), the method provides for higher compression than those methods based on a single bitplane context. An additional improvement over the prior art is that the method eliminates the need to form a Gray code bit plane representation, as is commonly done to reduce the correlation among bit planes. However, if used on conjunction with the gray code, a small improvement in compression performance will still be realized.
    • 对于图像位平面描述了编码方法,由此采用使用基于来自当前位平面和先前解码的位平面的像素的调节上下文的算术编码器。 对于相同数量的上下文(这对于最小化内存使用而言很重要),该方法提供比基于单个位平面上下文的那些方法更高的压缩。 相对于现有技术的另外的改进是,该方法消除了形成格雷码位平面表示的需要,如通常所做的那样来减少位平面之间的相关性。 然而,如果与灰色代码一起使用,仍然可以实现压缩性能的小幅改善。
    • 2. 发明授权
    • Spectral visible edge marking for steganography or watermarking
    • 用于隐写或水印的光谱可见边缘标记
    • US08947744B2
    • 2015-02-03
    • US13526820
    • 2012-06-19
    • Andrew F. KurtzKurt M. SchroederMajid Rabbani
    • Andrew F. KurtzKurt M. SchroederMajid Rabbani
    • H04N1/40
    • G06K19/0614B42D25/333B42D25/382B42D25/387G06K1/121G06K19/06103H04N1/32133H04N2201/327H04N2201/3271
    • A print media (200) comprises paper or other substrate, on which image content, whether text or images are printed with accompanying hidden data (220). The image content is printed with one or more normal printing process visible colorants (340), while the hidden data (220) is printed with spectral edge markers (320). The spectral edge marker materials (320) have a substantial spectral absorption just outside the human visible spectrum, and only slight visible absorption, which is masked by the visible colorants (340). Although the hidden data is nominally visually imperceptible, an image capture device (250) having a visible spectral response that extends into a spectral region just outside the visible spectrum where the spectral edge marker absorption occurs, can then detect the hidden data.
    • 打印介质(200)包括纸或其他基板,图像内容,文本或图像是否随着隐藏数据被打印(220)。 图像内容用一个或多个正常打印过程可见的着色剂(340)打印,而隐藏数据(220)用光谱边缘标记(320)打印。 光谱边缘标记材料(320)在人类可见光谱外部具有实质的光谱吸收,并且只有轻微的可见光吸收,其被可见的着色剂(340)掩蔽。 虽然隐藏的数据在名义上视觉上是不可察觉的,但是具有可见光谱响应的图像捕获装置(250)可以检测隐藏的数据,该可见光谱响应延伸到光谱边缘标记物吸收发生的可见光谱之外的光谱区域。
    • 3. 发明授权
    • Spectral edge marking for steganography or watermarking
    • 用于隐写或水印的光谱边缘标记
    • US08941886B2
    • 2015-01-27
    • US13526837
    • 2012-06-19
    • Andrew F. KurtzKurt M. SchroederMajid Rabbani
    • Andrew F. KurtzKurt M. SchroederMajid Rabbani
    • H04N1/40
    • C09D11/037B42D25/382B42D25/387C09D11/32G06K1/121G06K19/06103G06K19/0614H04N1/3224H04N1/32309H04N1/32331
    • A method for providing digital watermarking for text or images that uses spectral edge marking materials (320) printed on a print media (200) to embed hidden data (220). The spectral edge markers (320) have an absorption spectrum at the edge of the human visible spectrum, either at the UV edge or IR edge, which provides an optical density that is generally imperceptible to humans, but which can be detected by an image capture device (250). The crosstalk of visible optical absorption provided by these materials is largely masked by the presence of visible colorant(s) (340), with only small color differences between areas with and without the spectral edge markers (320). The image capture device (250) has a visible spectral response that extends into a spectral region just outside the visible spectrum where the spectral edge marker absorption occurs, and can be operated to detect the hidden data.
    • 一种用于为文本或图像提供数字水印的方法,该方法使用打印在打印介质(200)上的光谱边缘标记材料(320)来嵌入隐藏数据(220)。 光谱边缘标记(320)在人类可见光谱的边缘处具有在UV边缘或IR边缘处的吸收光谱,其提供通常对人类不可察觉的光密度,但是可以通过图像捕获来检测 设备(250)。 由这些材料提供的可见光吸收的串扰在很大程度上被可见色素(340)的存在所遮蔽,在具有和不具有光谱边缘标记(320)的区域之间仅具有小的色差。 图像捕获装置(250)具有可见的光谱响应,其延伸到刚好在发生光谱边缘标记吸收的可见光谱外部的光谱区域中,并且可以操作以检测隐藏的数据。
    • 7. 发明授权
    • Method for compressing and decompressing digital having text
    • 用于压缩和解压缩具有文本的数字图像的方法
    • US06625323B2
    • 2003-09-23
    • US09161032
    • 1998-09-25
    • Thomas A. HendersonMajid Rabbani
    • Thomas A. HendersonMajid Rabbani
    • G06K934
    • G06T9/007
    • A method for compressing a digital image having both saturated text and/or line art and pictorial imagery, the method comprises the steps of: receiving the digital image as blocks of pixels; analyzing the block content to determine if all or any combination of the saturated text and/or line art, pictorial imagery or other types of image data are present; assigning the saturated text and/or line art, the pictorial imagery, the other types of image data to one of a plurality of categories; compressing the block of saturated text and/or line art, if any, according to a first predetermined compression method; compressing the pictorial imagery, if any, according to a second predetermined compression method; compressing the other types of imagery, if any, according to other predetermined compression methods; and providing means of conveying the image categories to a decoder.
    • 一种用于压缩具有饱和文本和/或线条艺术和图像图像的数字图像的方法,所述方法包括以下步骤:接收数字图像作为像素块; 分析块内容以确定饱和文本和/或线条艺术,图像图像或其他类型的图像数据的全部或任何组合是否存在; 将饱和文本和/或线条艺术,图形图像,其他类型的图像数据分配给多个类别中的一个; 根据第一预定压缩方法压缩饱和文本和/或行艺术块(如果有的话); 根据第二预定压缩方法压缩图形图像(如果有的话); 根据其他预定的压缩方法压缩其他类型的图像(如果有的话); 以及提供将图像类别传送到解码器的装置。
    • 8. 发明授权
    • Method and apparatus for visually optimized rate control
    • 用于视觉优化速率控制的方法和装置
    • US06212302B1
    • 2001-04-03
    • US09222190
    • 1998-12-29
    • Chris W. HonsingerMajid RabbaniPaul W. Jones
    • Chris W. HonsingerMajid RabbaniPaul W. Jones
    • G06K936
    • G06T9/00
    • A method selecting a quality parameter for use in compressing a digital image, the method comprises the steps of creating a plurality of quantizer parameter sets, each having a corresponding quality parameter; compressing the digital image with the plurality of quantizer parameter sets for providing a corresponding plurality of compressed file sizes; creating a rate-distortion curve from the plurality of quantizer parameter sets and the corresponding compressed file sizes; providing a maximum and minimum quality parameters; providing a target compressed file size; and selecting a quality parameter based on the rate distortion curve, the maximum and minimum quality parameters and the target compressed file size.
    • 一种选择用于压缩数字图像的质量参数的方法,所述方法包括以下步骤:创建多个具有相应质量参数的量化器参数集; 使用所述多个量化器参数集来压缩所述数字图像,以提供对应的多个压缩文件大小; 从多个量化器参数集和对应的压缩文件大小创建速率 - 失真曲线; 提供最大和最小的质量参数; 提供目标压缩文件大小; 并根据速率失真曲线,最大和最小质量参数以及目标压缩文件大小选择质量参数。
    • 10. 发明授权
    • Photograhic system with selected area image authentication
    • 具有选定区域图像认证的Photograhic系统
    • US5898779A
    • 1999-04-27
    • US837186
    • 1997-04-14
    • John R. SquillaOmid A. MoghadamMajid Rabbani
    • John R. SquillaOmid A. MoghadamMajid Rabbani
    • H04L9/32H04N1/21H04N1/32H04K1/00
    • H04N1/32128H04L9/3247H04L2209/60H04N2101/00H04N2201/3225H04N2201/3236H04N2201/325H04N2201/3274H04N2201/3277
    • A public key encryption system for authenticating an image includes a digital camera having embedded therein a private key unique to the digital camera. A known public key uniquely based upon the private key is used to decrypt digital data encrypted with the private key to establish authenticity of the image. The encryption system further comprises means for generating one or more patterns each composed of at least one individual area that is visible together with the image of the object, means for designating at least one individual area as an active area of the image suitable for authentication and for generating location data identifying the active area, and means for calculating image hash from image data of the active area of the image using a predetermined hash algorithm. The image hash is then encrypted with the embedded private key, thereby producing a digital signature uniquely associated with the active area of the image, and the image data, the digital signature, and the location data of said active area are stored in a digital record. By confining encryption to this selected region of interest, power requirements for subsequent hashing and encryption are reduced, which is an advantage for portable devices such as a digital camera.
    • 用于认证图像的公开密钥加密系统包括其中嵌入了数字照相机独有的专用密钥的数字照相机。 使用基于私钥的公知密钥来解密用私钥加密的数字数据,以建立图像的真实性。 加密系统还包括用于产生一个或多个图案的装置,每个图案由与物体的图像一起可见的至少一个独立区域组成,用于将至少一个单独区域指定为适合于认证的图像的活动区域, 用于生成识别活动区域的位置数据,以及用于使用预定的散列算法从图像的活动区域的图像数据计算图像散列的装置。 然后利用嵌入的私钥对图像散列进行加密,从而产生与图像的有效区域唯一相关联的数字签名,并且将图像数据,数字签名和所述活动区域的位置数据存储在数字记录 。 通过将加密限制在所选择的感兴趣区域,减少后续散列和加密的功率要求,这对于诸如数码相机的便携式设备是有利的。