公开(公告)号：US06636645B1

公开(公告)日：2003-10-21

申请号：US09606700

申请日：2000-06-29

申请人： Qing Yu ,  Jiebo Luo ,  Rajan L. Joshi

发明人： Qing Yu ,  Jiebo Luo ,  Rajan L. Joshi

IPC分类号： G06K900

CPC分类号： H04N1/58 ,  H04N19/865

摘要： A digital image processing method reduces noise and blocking artifacts in a digital image by first converting the RGB values of the digital image pixels to Y, Cb and Cr components, then detecting the block boundaries in the Y, Cb and Cr image components, and estimating the noise in the Y, Cb and Cr image components. One or more noise tables are constructed for the Y, Cb and Cr image components. An adaptive Huber-Markov-random-field-model-based filter (HMRF) is applied to the Y, Cb and Cr image components, wherein the adaptive feature of the HMRF employs the detected block boundaries and the noise tables to produce filtered Y, Cb and Cr image components. Finally, the filtered Y, Cb and Cr image components are converted to RGB components.

摘要翻译： 数字图像处理方法通过首先将数字图像像素的RGB值转换为Y，Cb和Cr分量，然后检测Y，Cb和Cr图像分量中的块边界，并估计数字图像处理方法，从而减少数字图像中的噪声和块伪影 Y，Cb和Cr图像组件中的噪声。 为Y，Cb和Cr图像分量构建一个或多个噪声表。 将适应性Huber-Markov随机场模型滤波器（HMRF）应用于Y，Cb和Cr图像分量，其中HMRF的自适应特征采用检测的块边界和噪声表来产生滤波的Y， Cb和Cr图像组件。 最后，将滤波的Y，Cb和Cr图像分量转换为RGB分量。

公开(公告)号：US06643410B1

公开(公告)日：2003-11-04

申请号：US09606266

申请日：2000-06-29

申请人： Qing Yu ,  Jiebo Luo ,  Rajan L. Joshi

发明人： Qing Yu ,  Jiebo Luo ,  Rajan L. Joshi

IPC分类号： G06K900

CPC分类号： H04N1/409 ,  G06T9/00 ,  H04N19/865

摘要： A digital image processing method determines the extent of blocking artifacts in a digital image by first forming a column difference image and averaging the values in the columns in the column difference image to produce a column difference array. The average of the values in the column difference array that are separated by one block width are computed to produce a block averaged column difference array. Then, the peak value in the block averaged column difference array is located, and the mean value of the block averaged column difference array (excluding the peak value) is calculated to produce a column base value, and the ratio between the peak value and the base value are computed to produce a column ratio. The foregoing steps are repeated in the row direction to produce a row ratio. Finally, the column and row ratios are employed as a measure of the extent of blocking artifacts in the digital image.

摘要翻译： 数字图像处理方法通过首先形成列差分图像并对列差分图像中的列中的值进行平均以确定列差分阵列来确定数字图像中的块伪影的程度。 计算分隔一个块宽度的列差异数组中的值的平均值，以产生块平均列差数组。 然后，定位块平均列差分阵列中的峰值，计算块平均列差数组（除峰值之外）的平均值，以产生列基值，峰值与 计算基值以产生柱比。 在行方向上重复上述步骤以产生行比。 最后，使用列和行比作为数字图像中块伪影程度的量度。

公开(公告)号：US06895121B2

公开(公告)日：2005-05-17

申请号：US09898230

申请日：2001-07-03

申请人： Rajan L. Joshi ,  Jiebo Luo

发明人： Rajan L. Joshi ,  Jiebo Luo

IPC分类号： H04N7/30 ,  G06T9/00 ,  H03M7/30 ,  H04N1/41 ,  H04N7/26 ,  G06K9/36

CPC分类号： G06T9/008 ,  H04N19/63

摘要： A method for producing a compressed bit-stream from a digital image includes the steps of a) processing the digital image to produce a main subject belief map containing a continuum of belief values relating to the importance of subject and background regions in the image, b) performing a spatio-frequency transformation on the digital image to produce an array of transform coefficients, c) deriving a distortion-weighting factor for each transform coefficient from the belief map, and d) producing a compressed bit stream using an image compression system that is responsive to the distortion-weighting factors. The specific image compression system may be selected from a variety of image compression systems, including JPEG compression, JPEG2000 compression or vector quantization. The production of the main subject belief map involves the extraction of at least one structural saliency feature and at least one semantic saliency feature from the image, and the integration of the structural saliency feature and the semantic feature using a probabilistic reasoning engine into an estimate of a belief that a region of the digital image is the main subject.

摘要翻译： 一种用于从数字图像产生压缩比特流的方法包括以下步骤：a）处理数字图像以产生包含与图像中的被摄体和背景区域的重要性有关的连续的置信度值的主要被摄体信念图，b ）对所述数字图像执行空间 - 频率变换以产生变换系数阵列，c）从所述置信图导出每个变换系数的失真加权因子，以及d）使用图像压缩系统产生压缩比特流，所述图像压缩系统 响应于失真加权因子。 特定图像压缩系统可以从各种图像压缩系统中选择，包括JPEG压缩，JPEG2000压缩或矢量量化。 主题信念图的生成涉及从图像中提取至少一个结构显着特征和至少一个语义突出特征，以及使用概率推理引擎将结构显着特征和语义特征的集成到估计中 相信数字图像的一个区域是主要的主题。

公开(公告)号：US20110249737A1

公开(公告)日：2011-10-13

申请号：US13012583

申请日：2011-01-24

申请人： Rajan L. Joshi ,  Marta Karczewicz ,  Wei-Jung Chien

发明人： Rajan L. Joshi ,  Marta Karczewicz ,  Wei-Jung Chien

IPC分类号： H04N7/32

CPC分类号： H04N19/523 ,  H04N19/117 ,  H04N19/70 ,  H04N19/82

摘要： During the prediction stage of a video encoding and/or decoding process, a video coder can use relatively longer filters for certain motion vectors pointing to certain sub-pixel positions and relatively shorter filters for motion vectors pointing to other sub-pixel positions, where a longer filter generally refers to an interpolation filter with a greater number of filter coefficients, also called taps, while a shorter filter generally refers to an interpolation filter with fewer taps.

摘要翻译： 在视频编码和/或解码处理的预测阶段期间，视频编码器可以针对指向某些子像素位置的特定运动矢量使用相对较长的滤波器，并且对于指向其它子像素位置的运动矢量可以使用相对较短的滤波器，其中 更长的滤波器通常是指具有更多数量的滤波器系数的插值滤波器，也称为抽头，而较短的滤波器通常是指具有较少抽头的插值滤波器。

公开(公告)号：US07110025B1

公开(公告)日：2006-09-19

申请号：US09685998

申请日：2000-10-11

申请人： Alexander C. Loui ,  Kenneth A. Parulski ,  Thomas N. Berarducci ,  William M. Jackson ,  Rajan L. Joshi

发明人： Alexander C. Loui ,  Kenneth A. Parulski ,  Thomas N. Berarducci ,  William M. Jackson ,  Rajan L. Joshi

IPC分类号： H04N5/225 ,  H04N7/26 ,  H04N5/76

CPC分类号： H04N5/232 ,  H04N5/23245 ,  H04N5/77 ,  H04N5/772 ,  H04N5/781 ,  H04N5/85 ,  H04N5/907 ,  H04N9/7921 ,  H04N9/8042 ,  H04N9/8047 ,  H04N19/132 ,  H04N19/159 ,  H04N19/172 ,  H04N19/182 ,  H04N19/33 ,  H04N19/59 ,  H04N21/4223 ,  H04N21/440263 ,  H04N21/44029 ,  H04N21/64792 ,  H04N21/8153

摘要： A method for simultaneously recording motion and still images, includes the steps of: capturing a motion image sequence and accompanying audio of a scene with a digital video camera adapted to record both motion and higher resolution still images; simultaneously capturing a still image sequence having a higher resolution and lower frame rate than the motion capture sequence; compressing the motion image sequence using interframe compression and the accompanying audio and storing the compressed motion image and audio data; and compressing the still images using intraframe coding and storing the compressed still image data.

摘要翻译： 一种用于同时记录运动和静止图像的方法，包括以下步骤：利用适于记录运动和更高分辨率静止图像的数字摄像机捕获运动图像序列和伴随的场景音频; 同时捕获具有比运动捕获序列更高分辨率和更低帧速率的静止图像序列; 使用帧间压缩和伴随的音频压缩运动图像序列并存储压缩的运动图像和音频数据; 以及使用帧内编码压缩静止图像并存储压缩的静止图像数据。

公开(公告)号：US06987890B2

公开(公告)日：2006-01-17

申请号：US10108151

申请日：2002-03-27

申请人： Rajan L. Joshi ,  Aaron T. Deever

发明人： Rajan L. Joshi ,  Aaron T. Deever

IPC分类号： G06K9/46 ,  H04N7/12

CPC分类号： H04N19/40 ,  H04N19/115 ,  H04N19/146 ,  H04N19/147 ,  H04N19/162 ,  H04N19/192 ,  H04N19/46 ,  H04N19/61 ,  H04N19/63 ,  H04N19/645

摘要： A method for encoding rate-distortion information associated with the compression of an input digital image includes the steps of: computing rate and distortion-reduction values associated with each coding pass of each compressed codeblock bit-stream, and encoding rate and distortion-reduction values associated with coding passes contained in the final compressed bit-stream. A method for using encoded rate-distortion information associated with a compressed digital image bit-stream during transcoding of said compressed digital image bitstream includes the steps of: parsing the compressed digital image bit-stream to obtain compressed codeblock bit-streams, decoding the encoded RD information to obtain rate and distortion-reduction values associated with codeblock coding passes, and using such rate-distortion information to optimally transcode such compressed digital image bit-stream to form a new compressed digital image bit-stream at a given bit-rate, resolution, and for given visual weights.

摘要翻译： 用于编码与输入数字图像的压缩相关联的速率 - 失真信息的方法包括以下步骤：计算与每个压缩码块比特流的每个编码遍相关联的速率和失真降低值，以及编码速率和失真降低值 与包含在最终压缩比特流中的编码通道相关联。 一种用于在所述压缩数字图像比特流的代码转换期间使用与压缩数字图像比特流相关联的编码速率失真信息的方法包括以下步骤：解析压缩的数字图像比特流以获得压缩的码块比特流， RD信息以获得与码块编码通过相关联的速率和失真降低值，并且使用这种速率失真信息来最优地对这样的压缩数字图像比特流进行代码转换，以给定比特率形成新的压缩数字图像比特流， 分辨率和给定的视觉重量。

公开(公告)号：US09081733B2

公开(公告)日：2015-07-14

申请号：US12820346

申请日：2010-06-22

申请人： Yuriy Reznik ,  Rajan L. Joshi ,  Marta Karczewicz

发明人： Yuriy Reznik ,  Rajan L. Joshi ,  Marta Karczewicz

IPC分类号： H04N7/12 ,  H04N11/02 ,  G06F17/14

CPC分类号： G06F17/147 ,  H04N19/42 ,  H04N19/61 ,  H04N19/625

摘要： In general, techniques are described for implementing a 16-point inverse discrete cosine transform (IDCT) that is capable of applying multiple IDCTs of different sizes. For example, an apparatus comprising a 16-point inverse discrete cosine transform of type II (IDCT-II) unit may implement the techniques of this disclosure. The 16-point IDCT-II unit performs these IDCTs-II of different sizes to transform data from a spatial to a frequency domain. The 16-point IDCT-II unit includes an 8-point IDCT-II unit that performs one of the IDCTs-II of size 8 and a first 4-point IDCT-II unit that performs one of the IDCTs-II of size 4. The 8-point IDCT-II unit includes the first 4-point DCT-II unit. The 16-point IDCT-II unit also comprises an inverse 8-point DCT-IV unit that includes a second 4-point IDCT-II unit and a third 4-point IDCT-II unit. Each of the second and third 4-point IDCT-II units performs one of the IDCTs-II of size 4.

摘要翻译： 一般来说，描述了实现能够应用不同大小的多个IDCT的16点离散余弦变换（IDCT）的技术。 例如，包括II型（IDCT-II）单元的16点逆离散余弦变换的装置可以实现本公开的技术。 16点IDCT-II单元执行不同尺寸的这些IDCT-II以将数据从空间变换到频域。 16点IDCT-II单元包括执行尺寸为8的IDCT-II之一的8点IDCT-II单元和执行大小为4的IDCT-II之一的第一个4点IDCT-II单元。 8点IDCT-II单元包括第一个4点DCT-II单元。 16点IDCT-II单元还包括具有第二4点IDCT-II单元和第三个4点IDCT-II单元的逆8点DCT-IV单元。 第二和第三4点IDCT-II单元中的每一个执行大小为4的IDCT-II之一。

公开(公告)号：US08665964B2

公开(公告)日：2014-03-04

申请号：US12495613

申请日：2009-06-30

申请人： Rajan L. Joshi ,  Peisong Chen ,  Marta Karczewicz

发明人： Rajan L. Joshi ,  Peisong Chen ,  Marta Karczewicz

IPC分类号： H04N7/18

CPC分类号： H04N19/567 ,  H04N19/102 ,  H04N19/105 ,  H04N19/109 ,  H04N19/11 ,  H04N19/147 ,  H04N19/176 ,  H04N19/61

摘要： This disclosure describes video encoding and decoding techniques in which a first order prediction process and a second order prediction process are used in combination to generate predictive video blocks for video coding. First order prediction may be similar to conventional motion estimation and motion compensation that generates residual video blocks. The second order prediction may involve a process similar to conventional intra-prediction, but is performed on the residual video blocks. The techniques of this disclosure may pre-define the second order prediction to a specific mode, such as a mode similar to the intra-DC mode used in intra coding. In addition, the techniques of this disclosure may combine aspects of the first order and second order prediction into a single process so that the effects of second order prediction on the residuals are taken into account during the first order prediction process, which may improve compression.

摘要翻译： 本公开描述了视频编码和解码技术，其中组合使用一阶预测处理和二阶预测处理以产生用于视频编码的预测视频块。 第一阶预测可以类似于产生残余视频块的常规运动估计和运动补偿。 二阶预测可以涉及与常规帧内预测类似的处理，但是对剩余视频块执行。 本公开的技术可以预定义到特定模式的二阶预测，例如类似于帧内编码中使用的DC内模式的模式。 此外，本公开的技术可以将一阶和二阶预测的方面组合成单个过程，使得在第一阶预测过程期间考虑二阶预测对残差的影响，这可以改善压缩。

公开(公告)号：US20100329329A1

公开(公告)日：2010-12-30

申请号：US12820312

申请日：2010-06-22

申请人： Yuriy Reznik ,  Rajan L. Joshi ,  Marta Karczewicz

发明人： Yuriy Reznik ,  Rajan L. Joshi ,  Marta Karczewicz

IPC分类号： H04N7/12

CPC分类号： H04N19/625 ,  G06F17/147 ,  H04N19/60

摘要： In general, techniques are described for implementing an 8-point inverse discrete cosine transform (IDCT). An apparatus comprising an 8-point inverse discrete cosine transform (IDCT) hardware unit may implement these techniques to transform media data from a frequency domain to a spatial domain. The 8-point IDCT hardware unit includes an even portion comprising factors A, B that are related to a first scaled factor (μ) in accordance with a first relationship. The 8-point IDCT hardware unit also includes an odd portion comprising third, fourth, fifth and sixth internal factors (G, D, E, Z) that are related to a second scaled factor (η) in accordance with a second relationship. The first relationship relates the first scaled factor to the first and second internal factors. The second relationship relates the second scaled factor to the third, fourth, fifth and sixth internal factors.

摘要翻译： 通常，描述了用于实现8点逆离散余弦变换（IDCT）的技术。 包括8点逆离散余弦变换（IDCT）硬件单元的装置可实施这些技术以将媒体数据从频域转换为空间域。 8点IDCT硬件单元包括与根据第一关系的第一缩放因子（μ）相关的因子A，B的偶数部分。 8点IDCT硬件单元还包括与根据第二关系的第二比例因子（＆eegr）相关的第三，第四，第五和第六内部因素（G，D，E，Z）的奇数部分。 第一个关系将第一个缩放因子与第一个和第二个内部因素相关联。 第二个关系将第二个比例因素与第三个，第四个，第五个和第六个内部因素联系起来。

公开(公告)号：US07502501B2

公开(公告)日：2009-03-10

申请号：US11315033

申请日：2005-12-22

申请人： Rajan L. Joshi

发明人： Rajan L. Joshi

IPC分类号： G06K9/00

CPC分类号： G06T15/08 ,  G06T2200/16

摘要： A system renders oblique slices through volumetric data accessed via a network using a client-server architecture. The system includes a server for processing and storing volumetric data comprising axial slices obtained from a diagnostic scanning system, a client for processing user requests related to specific views of the volumetric data, and a network protocol for connecting the client with the server over the network and obtaining data from the server for use by the client. A processing stage at the client specifies an oblique slice and communicates particulars of the oblique slice to the server, thereupon obtaining axial slice data from the server specifically for portions of the axial slices that are needed to render the oblique slice. Memory at the client stores the axial slice data, and a rendering stage at the client renders the oblique slice from the axial slice data in the memory.

摘要翻译： 系统通过使用客户端 - 服务器架构通过网络访问的体积数据呈现倾斜切片。 该系统包括用于处理和存储体积数据的服务器，其包括从诊断扫描系统获得的轴向切片，用于处理与体积数据的特定视图相关的用户请求的客户端以及用于通过网络将客户端与服务器连接的网络协议 并从服务器获取数据以供客户端使用。 客户端的处理阶段指定一个倾斜切片，并将斜切片的细节传送到服务器，从而从服务器获得专门用于呈现倾斜切片所需的轴向切片部分的轴向切片数据。 客户端的存储器存储轴向切片数据，并且客户端的渲染阶段从存储器中的轴向切片数据呈现斜切片。