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21.发明授权Method for compression of image data and corresponding apparatus and computer-program product 有权图像数据压缩方法及相应设备及计算机程序产品公开(公告)号：US07616825B2
公开(公告)日：2009-11-10
申请号：US11295174
申请日：2005-12-05
CPC分类号： H04N19/124 , H04N19/15 , H04N19/194 , H04N19/60
摘要： A method for compression includes applying a discrete cosine transform to said image data to obtain transform coefficients, quantizing the transform coefficients by applying a quantization level scaled through a gain value, adjusting the gain value as a function of desired image parameters by executing a first time said quantization operation applying a first gain value and obtaining first quantized data, estimating statistically a second gain value suitable to obtain the desired image parameters, and executing a second time said quantization operation applying said second gain value. The operation of statistical estimation of the second gain value includes evaluating a threshold value as a function of the desired image parameters and setting to zero a percentage of coefficients of the first quantized data as a function of the threshold value.
摘要翻译： 一种用于压缩的方法包括对所述图像数据应用离散余弦变换以获得变换系数，通过应用通过增益值缩放的量化级量化变换系数，通过执行第一次来调整作为期望图像参数的函数的增益值 所述量化操作应用第一增益值并获得第一量化数据，统计地估计适于获得所需图像参数的第二增益值，以及执行施加所述第二增益值的所述量化操作的第二时间。 第二增益值的统计估计的操作包括作为期望图像参数的函数来评估阈值，并将作为阈值的函数的第一量化数据的系数百分比设置为零。
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22.发明申请Method and system for processing signals via perceptive vectorial quantization, computer program product therefor 失效用于通过感知向量量化处理信号的方法和系统，其计算机程序产品公开(公告)号：US20050063472A1
公开(公告)日：2005-03-24
申请号：US10911205
申请日：2004-08-03
CPC分类号： H04N19/59 , H04N19/126 , H04N19/14 , H04N19/176 , H04N19/60 , H04N19/94
摘要： The system carries out conversion of digital video signals organized in blocks of pixels from a first format to a second format. The second format is a format compressed via vector quantization. The vector quantization is performed by means of repeated application of a scalar quantizer to the pixels of said blocks with a quantization step (Q) determined in an adaptive way according to the characteristics of sharpness and/or brightness of the pixels and representing said vector quantization in a n-dimensional space indicative of the characteristics on n of said pixels in the block partitioned into cells of size proportional to said quantization step, each cell being assigned to an appropriate binary code, wherein said process further includes identifying at least one symmetry element in said n-dimensional space suitable for separating at least two symmetrical set of cells, and selecting one of said at least two symmetrical set of cells for the assignment of said binary codes. A symmetrical permutation on the n pixels of the block is performed according the selection and a part of said binary code indicating the status of said symmetrical permutation is conveniently set.
摘要翻译： 系统将以像素块组织的数字视频信号从第一格式转换成第二格式。 第二种格式是通过矢量量化压缩的格式。 通过根据像素的清晰度和/或亮度的特性以自适应方式确定的量化步长（Q），将标量量化器重复施加到所述块的像素，并且表示所述矢量量化 在表示分割成与所述量化步长成比例的大小的单元格中的块中的所述像素的n上的特征的n维空间中，每个单元被分配给适当的二进制代码，其中所述处理还包括识别至少一个对称元素 在适于分离至少两个对称的单元格组的所述n维空间中，并且选择所述至少两个对称的单元格之一用于分配所述二进制码。 根据选择执行对块的n个像素的对称置换，并且方便地设置指示所述对称置换状态的所述二进制码的一部分。
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公开(公告)号：US09129393B2
公开(公告)日：2015-09-08
申请号：US13421799
申请日：2012-03-15
CPC分类号： G06T5/20 , G06T3/4015
摘要： An embodiment relates to a method and an image processor for reducing chroma noise in digital-image data. An embodiment performs noise reduction in the color-filter-array domain prior to demosaicing in order to prevent spreading of noise in subsequent stages of the image-processing pipeline. Peaks in the CFA data are attenuated in order to prevent any undesired color cast. Specifically, any correction to a certain pixel is made in accordance with the amplitude of digital gains applied, as well as with the local luminance and the contribution of the current color channel to the local luminance. In this manner, corrections are restricted to image areas that are subject to high digital amplification, that are comparatively dark, and that are not dominated by the current color channel.
摘要翻译： 一个实施例涉及一种用于减少数字图像数据中的色度噪声的方法和图像处理器。 一个实施例在去马赛克之前在彩色滤波器阵列域中执行降噪，以防止在图像处理流水线的后续阶段中噪声的扩展。 CFA数据中的峰值被衰减，以防止任何不期望的色彩变化。 具体地，根据所应用的数字增益的幅度以及局部亮度和当前色彩通道对局部亮度的贡献，对某个像素进行任何校正。 以这种方式，校正被限制在经受比较暗的高数字放大的图像区域，并且不被当前颜色通道所主导。
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24.发明授权Method and relative device for estimating white gaussian noise that corrupts a digital image 有权用于估计破坏数字图像的白高斯噪声的方法和相关装置公开(公告)号：US08224109B2
公开(公告)日：2012-07-17
申请号：US11868358
申请日：2007-10-05
IPC分类号： G06K9/20 , G06K9/36 , G06K9/40 , G06K9/62 , G06K9/66 , G06K9/46 , G06K9/34 , G06T5/00 , H04N1/407 , H04N1/409 , H04N1/38 , H04N5/217 , H04N5/00 , H04N5/228
CPC分类号： G06K9/40 , G06T5/002 , G06T7/90 , G06T2207/10024 , G06T2207/20021
摘要： A method for estimating the white Gaussian noise level that corrupts a digital image by discriminating homogeneous blocks from blocks containing a textured area and skipping these last blocks when evaluating the noise standard deviation.
摘要翻译： 一种估计白高斯噪声电平的方法，该方法通过在评估噪声标准偏差时，通过区分含有纹理区域的块的均匀块和跳过这些最后块来破坏数字图像。
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25.发明授权公开(公告)号：US08150181B2
公开(公告)日：2012-04-03
申请号：US12272591
申请日：2008-11-17
IPC分类号： G06K9/46
摘要： According to the novel method, roto-translational and zooming parameters describing spurious motion effects are determined by exploiting any of the many block matching algorithms commonly used for motion estimation for calculating a motion vector for all or for a selected number of blocks of pixels of the current frame that is processed. Some of the so calculated motion vectors are not taken into account for estimating spurious motion effects. The roto-translational and zooming parameters describing what is considered to be spurious global motion between a current frame and the precedent frame of the sequence, are calculated by processing the selected motion vectors of blocks of pixels of the frame through a recursive procedure that includes computing error values and readjusting the roto-translational and zooming parameters based on the error values.
摘要翻译： 根据该新颖的方法，通过利用通常用于运动估计的许多块匹配算法中的任何一种来计算全部或所选择的数量的像素块的运动矢量来确定描述寄生运动效应的旋转和缩放参数 当前被处理的帧。 为了估计杂散运动效应，不考虑一些如此计算的运动矢量。 通过包括计算的递归过程处理帧的像素块的所选择的运动矢量来计算描述在当前帧和序列的先前帧之间被假定为全局运动的旋转和缩放参数 错误值，并根据错误值重新调整旋转和缩放参数。
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公开(公告)号：US20100040303A1
公开(公告)日：2010-02-18
申请号：US12542740
申请日：2009-08-18
IPC分类号： G06K9/40
CPC分类号： H04N5/3675 , G06T5/002 , G06T5/005 , G06T5/20 , G06T7/0004 , G06T2207/10024 , H04N5/217
摘要： A method for correcting an image from defects and filtering from Gaussian noise corrects each pixel of the image when it is considered defective and filters it from Gaussian noise in one-pass. The one-pass improves the speed for performing the correcting and filtering. The drawbacks associated with choosing incompatible defect correction and filtering operations are overcome.
摘要翻译： 一种从缺陷中校正图像并从高斯噪声滤波的方法，在被认为有缺陷的情况下校正图像的每个像素，并在一次通过时从高斯噪声中对其进行滤波。 单程提高了执行校正和过滤的速度。 克服了选择不兼容的缺陷校正和过滤操作相关的缺点。
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