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31.发明授权公开(公告)号：US07070252B2
公开(公告)日：2006-07-04
申请号：US10644472
申请日：2003-08-20
CPC分类号： B41J2/205 , H04N1/32144 , H04N1/32251 , H04N1/32267 , H04N1/32309
摘要： What is disclosed is a method for digital watermarking in a calibrated printing path and comprises: first receiving a pixel possessing color values from an input image; receiving a plurality of information bits to be encoded at a corresponding pixel in an output image. Then, one of at least two different GCR functions are selected where the selection is based on the state of the received information bits. The number of GCR functions to be selected from is dependent on the number of possible states of the information bits intended to be encoded at each image pixel and preferably equals the number of states of the information bits intended to be encoded at each image pixel such that the GCR spatially varies across the output image. Further, at least two GCR functions are optimized to carry information and information bits intended to be encoded within the output image are represented with a tag. CMYK values are then generated using the selected GCR function and the color values. These CMYK values are assigned to a corresponding pixel in the output image. The information bits to be encoded at a given pixel indicate the type of object to which that pixel belongs, such as: graphics, picture, text, line art, etc. The output image, when printed, exhibits the property that substantially similar colors occurring at different spatial locations in the input image are produced with substantially different CMYK combinations in the print. Preferably, a parameterized function is used for the GCR function and the encoded state sets the parameter of the function. Information bits should be redundantly encoded throughout the output image. Regions that cannot be encoded by GCR information have to be compensated for. A reference mark is applied on the output image to indicate the starting point and order of the information sequence.
摘要翻译： 所公开的是在校准打印路径中进行数字水印的方法，包括：首先从输入图像接收具有颜色值的像素; 在输出图像中的相应像素处接收要编码的多个信息比特。 然后，选择至少两个不同的GCR功能中的一个，其中选择基于所接收的信息比特的状态。 要选择的GCR功能的数量取决于要在每个图像像素处被编码的信息比特的可能状态的数量，并且优选地等于要在每个图像像素处编码的信息比特的状态数，使得 GCR在输出图像之间空间变化。 此外，至少两个GCR功能被优化以携带信息，并且用标签表示旨在在输出图像内编码的信息位。 然后使用所选的GCR功能和颜色值生成CMYK值。 这些CMYK值被分配给输出图像中的相应像素。 在给定像素处要编码的信息位指示像素所属于的对象的类型，例如：图形，图片，文本，线条等。输出图像在打印时表现出基本相似的颜色出现的属性 在输入图像中的不同空间位置处，在打印中以基本不同的CMYK组合产生。 优选地，GCR函数使用参数化函数，编码状态设置函数的参数。 信息位应在整个输出图像中进行冗余编码。 不能由GCR信息编码的区域必须得到补偿。 在输出图像上应用参考标记来指示信息序列的起点和顺序。
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公开(公告)号：US06219450B1
公开(公告)日：2001-04-17
申请号：US09191810
申请日：1998-11-13
IPC分类号： G06K948
CPC分类号： G06T9/00 , G06T7/00 , H04N19/865
摘要： A method detects if an image is compressed. The method determines a block grid within the image and establishes blocks from the determined grid. The method then computes differences between samples inside the established blocks and differences between samples across the established blocks. The method determines that the image is compressed based on characteristics derived from statistics of the computed differences.
摘要翻译： 方法检测图像是否被压缩。 该方法确定图像内的块网格，并从确定的网格建立块。 然后，该方法计算建立的块内的样本之间的差异以及建立的块之间的样本之间的差异。 该方法基于从计算出的差异的统计导出的特征来确定图像被压缩。
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公开(公告)号：US5892854A
公开(公告)日：1999-04-06
申请号：US787502
申请日：1997-01-21
CPC分类号： G06T7/004
摘要： The present invention is a method and apparatus for automatically detecting the characteristics of a document object placed on the platen of a digital copier or similar scanning system. The invention accomplishes the detection by processing a digitized image in a highly efficient manner using binary moments, and using the moments characterizes the shape of a boundary about the object. Once determined, the shape of the object may be employed to further process the image to automatically crop, derotate, and register the image at a predefined location in an output image suitable for rendering on a document substrate.
摘要翻译： 本发明是用于自动检测放置在数字复印机或类似扫描系统的台板上的文件对象的特性的方法和装置。 本发明通过使用二进制时刻以高效的方式处理数字化图像来实现检测，并且使用表征关于对象的边界的形状的时刻。 一旦确定，可以采用对象的形状来进一步处理图像，以便在适合于在文档基底上渲染的输出图像中的预定义位置处自动裁剪，解扭和注册图像。
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公开(公告)号：US5867598A
公开(公告)日：1999-02-02
申请号：US721130
申请日：1996-09-26
摘要： The present invention is a method and apparatus for the processing of images that have been compressed using a discrete cosine transform operation, and particularly JPEG compressed images. In a preferred embodiment, the rotation of image blocks is accomplished by sign inversion and transposition operations to accomplish intrablock operations. Subsequently, one of a number of alternative methods is employed to accomplish the same image processing on an interblock level, thereby enabling the rotation or mirroring of compressed images. The two stage process allows the use of either a standardized JPEG system with enhancements or a hybrid processing method, thereby accomplishing the image processing in conjunction with compression or decompression operations and minimizing the need for large memory buffers to accomplish the image processing. Accordingly, the technique has application to any number of systems, including digital printers and copiers where there may be a necessity to orthogonally rotate or mirror the digital image.
摘要翻译： 本发明是用于处理已经使用离散余弦变换操作压缩的图像的方法和装置，特别是JPEG压缩图像。 在优选实施例中，图像块的旋转通过符号反转和转置操作来完成嵌入式操作。 随后，采用多种替代方法中的一种来实现在块间级别上的相同图像处理，从而使压缩图像能够旋转或镜像。 两级处理允许使用具有增强或混合处理方法的标准化JPEG系统，从而结合压缩或解压缩操作完成图像处理，并最小化对大存储器缓冲器的需要以实现图像处理。 因此，该技术可应用于任何数量的系统，包括可能需要正交旋转或镜像数字图像的数字打印机和复印机。
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35.发明授权Compression of image data with retaining cost data for each compressed image block 失效压缩图像数据与每个压缩图像块的保留成本数据
公开(公告)号：US5838831A
公开(公告)日：1998-11-17
申请号：US721519
申请日：1996-09-26
CPC分类号： H04N19/00
摘要： An enhancement to the standard JPEG image data compression technique includes a step of recording the length of each string of bits corresponding to each block of pixels in the original image at the time of compression. The list of lengths of each string of bits in the compressed image data is retained as an "encoding cost map" or ECM. The ECM, which is considerably smaller than the compressed image data, can be transmitted or retained in memory separate from the compressed image data along with some other accompanying information and is used as a "key" for editing or segmentation of the compressed image data.
摘要翻译： 对标准JPEG图像数据压缩技术的增强包括在压缩时记录与原始图像中的每个像素块相对应的每个比特串的长度的步骤。 压缩图像数据中的每个比特串的长度列表被保留为“编码成本图”或ECM。 比压缩图像数据小得多的ECM可以与压缩图像数据一起发送或保留在存储器中，并与其他一些附带的信息一起被用作压缩图像数据的编辑或分割的“键”。
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公开(公告)号：US07493489B2
公开(公告)日：2009-02-17
申请号：US10200895
申请日：2002-07-22
CPC分类号： G06T1/0042 , G06T2201/0052 , H04N1/32144 , H04N1/3217 , H04N1/32187 , H04N1/32277 , H04N1/32304 , H04N2201/3236 , H04N2201/3239 , H04N2201/327
摘要： A system and method for authentication of JPEG image data enables the recipient to ascertain whether the received image file originated from a known identified source or whether the contents of the file have been altered in some fashion prior to receipt. A unique hashing function is derived from a first section of image data contained in the JPEG compressed image in such a way that any changes subsequently made to the first section of image data is reflected in a different hashing function being derived from a signature string is ten embedded into a next section of the image data. Since the embedding of a previous section's integrity checking number is done without modifying the JPEG bit stream, any JPEG decoder can thereafter properly decode the image.
摘要翻译： 用于认证JPEG图像数据的系统和方法使得接收者能够确定接收到的图像文件是否源自已知的识别源，或者在接收之前文件的内容是否已经以某种方式被改变。 从包含在JPEG压缩图像中的图像数据的第一部分导出唯一的散列函数，使得随后对图像数据的第一部分进行的任何改变反映在从签名串导出的不同散列函数中 嵌入图像数据的下一部分。 由于在不修改JPEG位流的情况下嵌入前一部分的完整性检查号码，所以随后的任何JPEG解码器都可以正确解码图像。
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37.发明授权公开(公告)号：US07391901B2
公开(公告)日：2008-06-24
申请号：US10674048
申请日：2003-09-29
IPC分类号： G06K9/00
CPC分类号： H04N1/40012
摘要： A method is disclosed for converting color images to textured monochrome images such that image regions with similar luminance but different chrominance look different when converted to black-and-white to preserve color information therein. This texture-encoded color information can be extracted at a later time to reconstitute the original color image. The present method involves first converting the color image to a luminance-chrominance colorspace. The chrominance data is decomposed into 4 channels of chrominance. A wavelet transformation of the luminance channel is preformed. Scaled chrominance channels are then mapped to a number of wavelet sub-bands. Once mapped, the wavelet transform is inverted to generate textures proportional to the original colors of the color image having an amplitude proportional to the chroma of the original color. The black-and-white image is embedded with this texture information into the image's grayscale component. In order to retrieve the color image from the textured grayscale image, a wavelet transform regenerates the scaled chrominance channels mapped therein. Those wavelet sub-bands comprising embedded chroma are extracted and scaled to the size of the original image. The remaining sub-bands are inverted to produce the Y-image thereof. Separate images now exist in Y, Cr, and Cb. The recombination of the YCbCr images produce the colored image that was previously embedded into the grayscale components of the textured black-and-white image.
摘要翻译： 公开了一种将彩色图像转换为纹理单色图像的方法，使得具有相似亮度但是不同色度的图像区域在转换为黑白色时看起来不同，以保留其中的颜色信息。 可以在稍后时间提取该纹理编码的颜色信息以重构原始彩色图像。 本方法包括首先将彩色图像转换为亮度 - 色度色彩空间。 色度数据分解成4通道色度。 执行亮度通道的小波变换。 缩放的色度信道然后被映射到多个小波子带。 一旦被映射，小波变换被反转以产生与具有与原始颜色的色度成比例的幅度的彩色图像的原始颜色成比例的纹理。 黑白图像将该纹理信息嵌入到图像的灰度分量中。 为了从纹理灰度图像中检索彩色图像，小波变换再生映射在其中的缩放的色度通道。 提取包括嵌入色度的那些小波子带，并缩放到原始图像的大小。 剩余的子带被反转以产生其Y图像。 分离图像现在存在于Y，Cr和Cb中。 YCbCr图像的复合产生先前嵌入纹理黑白图像的灰度分量中的彩色图像。
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公开(公告)号：US07187805B1
公开(公告)日：2007-03-06
申请号：US09447554
申请日：1999-11-23
申请人： Zhigang Fan , Ricardo L. de Queiroz
发明人： Zhigang Fan , Ricardo L. de Queiroz
IPC分类号： G06K9/36
CPC分类号： G06T9/007
摘要： This invention is a method and apparatus for processing decompressed images. More particularly, this invention relates to methods and apparatus which process images without requiring information on whether the image was previously compressed or how the image was compressed. Quantization values of each image block of a decompressed image are determined a compression method used to compress a decompressed image to be processed is identified. The method and apparatus of this invention is particularly useful to determine if a decompressed image was previously compressed using a JPEG compression technique by retrieving DCT coefficients and determining quantization values to determine original DCT coefficients of a compressed and decompressed image.
摘要翻译： 本发明是用于处理解压缩图像的方法和装置。 更具体地，本发明涉及处理图像的方法和装置，而不需要关于图像是否被预先压缩的信息或图像被压缩的信息。 确定解压缩图像的每个图像块的量化值，确定用于压缩待处理的解压缩图像的压缩方法。 本发明的方法和装置特别有用，用于通过检索DCT系数和确定量化值来确定解压缩的图像是否是使用JPEG压缩技术预先压缩的，以确定压缩和解压缩的图像的原始DCT系数。
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39.发明授权Method for decompressing JPEG files using a variable block size inverse discrete cosine transform 有权使用可变块大小反相离散余弦变换解压缩JPEG文件的方法公开(公告)号：US06778707B1
公开(公告)日：2004-08-17
申请号：US09466567
申请日：1999-12-17
IPC分类号： G06K936
CPC分类号： H04N19/59 , H04N19/122 , H04N19/132 , H04N19/14 , H04N19/176 , H04N19/18 , H04N19/44 , H04N19/60
摘要： A method for decompressing digital image data to improve the speed of decompression is disclosed. More specifically, the present invention improves image decompression time by operating upon a subset of the original data and by performing a modified discrete cosine transform on a subset of the originally provided data. The subset is determined by examining the compressed data and looking for a particular pattern of zero values and/or and “end of block” statement.
摘要翻译： 公开了一种解压缩数字图像数据以提高减压速度的方法。 更具体地，本发明通过对原始数据的子集进行操作并且通过对原始提供的数据的子集执行修改的离散余弦变换来提高图像解压缩时间。 通过检查压缩数据并查找零值的特定模式和/或“块结束”语句来确定该子集。
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40.发明授权Method and apparatus for analyzing image data to use multiple transforms for enhanced image data transmission 有权用于分析图像数据以使用多个变换以增强图像数据传输的方法和装置公开(公告)号：US06563955B2
公开(公告)日：2003-05-13
申请号：US09191355
申请日：1998-11-13
IPC分类号： G06K936
摘要： A method and apparatus for compressing digital image data to improve the efficiency of serial data transmission is disclosed. More specifically, the present invention accomplishes image transmission by providing multiple image processing modules, and then selecting the module that will process the entire in the most efficient manner, based upon the content of the data contained in the image. Image content is analyzed using hierarchical vector quantization.
摘要翻译： 公开了一种用于压缩数字图像数据以提高串行数据传输效率的方法和装置。 更具体地，本发明通过提供多个图像处理模块，然后基于包含在图像中的数据的内容，选择将以最有效的方式处理整个的模块来实现图像传输。 使用分层矢量量化分析图像内容。
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