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1. 发明授权

US06522783B1 Re-indexing for efficient compression of palettized images 有权
标题翻译：重新索引以有效压缩调色图像
公开(公告)号：US06522783B1
公开(公告)日：2003-02-18
申请号：US09448061
申请日：1999-11-23
申请人： Wenjun Zeng , Shaw-Min Lei , Jin Li
发明人： Wenjun Zeng , Shaw-Min Lei , Jin Li
IPC分类号： G06K936
CPC分类号： H04N1/644
摘要： A method for re-indexing a palette-indexed image is disclosed. The method uses an array of symbol cross-counts that indicate the degree of occurrence, within the image, of symbols in one or more predefined contextual relationships, such as symbol adjacency. One objective of the method is to manipulate the palette index such that adjacent symbols in the image are assigned indices that are as close as possible in symbol space, thus enhancing the subsequent compressability of the image with many lossless compressors. As global minimization is generally computationally impracticable, the disclosed embodiments present a greedy suboptimal solution to this problem. The basic method uses a one-dimensional reassignment pool and a seed symbol. A single symbol is selected for positioning either to the immediate right or left of the seed in the pool, according to a potential function that uses the cross-count array. This process is then iterated, considering the first and second pool symbols during the next selection, etc., placing symbols in the pool so as to minimize the average interpixel differences in the re-indexed image.
摘要翻译：公开了一种用于重新索引调色板索引图像的方法。该方法使用符号交叉计数的数组，其指示图像内在一个或多个预定义的上下文关系（诸如符号邻接）中的符号的出现程度。该方法的一个目标是操纵调色板索引，使得图像中的相邻符号被分配在符号空间中尽可能接近的索引，从而增强了具有许多无损压缩器的图像的随后的可压缩性。由于全局最小化通常在计算上是不切实际的，所公开的实施例呈现出对该问题的贪婪次优解。基本方法使用一维再分配池和种子符号。根据使用交叉计数数组的潜在功能，选择单个符号来定位到池中种子的右侧或左侧。然后重复该过程，考虑在下次选择期间的第一和第二池符号等，将符号放置在池中，以便最小化重新索引图像中的平均像素间差异。

2. 发明授权

US06553148B2 Joint coding method for images and videos with multiple arbitrarily shaped segments or objects 失效
标题翻译：具有多个任意形状的段或对象的图像和视频的联合编码方法
公开(公告)号：US06553148B2
公开(公告)日：2003-04-22
申请号：US09862399
申请日：2001-05-21
申请人： Wenjun Zeng , Jin Li , Shaw-Min Lei
发明人： Wenjun Zeng , Jin Li , Shaw-Min Lei
IPC分类号： G06K936
CPC分类号： H04N19/649 , H04N19/115 , H04N19/122 , H04N19/146 , H04N19/147 , H04N19/17 , H04N19/20 , H04N19/63 , H04N19/635 , H04N19/96
摘要： An adaptive image coding method and system are disclosed. The system accepts an input image, divides it into image segments, and assigns each segment to a wavelet transform filter from a bank of such filters for transformation. The bank preferably comprises filters adapted for different types of image content, e.g., sharp edges, slowly-varying contours, etc. Filters are preferably assigned so as to produce minimal distortion for their assigned image segments at a given target bit rate, each filter produces transform coefficients for its segment using scale and subband settings common to the entire image. The valid coefficients for each segment are then combined in a composite wavelet coefficient image, which resembles a single wavelet transform of an entire image—although different filters are used to create different portions of the coefficient image. The composite image allows joint, rate-distortion optimized coding for a segmented image. Joint coding allocates bits between the transforms of the image segments optimally, and produces an easily scaleable bitstream.
摘要翻译：公开了一种自适应图像编码方法和系统。系统接受输入图像，将其分割成图像段，并将每个分段分配给一个这样的滤波器组的小波变换滤波器进行变换。银行优选地包括适用于不同类型的图像内容的滤波器，例如尖锐边缘，缓慢变化的轮廓等。优选地分配滤波器以便以给定的目标比特率为其分配的图像段产生最小的失真，每个滤波器产生使用与整个图像共同的比例和子带设置来对其片段进行变换系数。然后将每个段的有效系数组合在复合小波系数图像中，其类似于整个图像的单个小波变换 - 尽管使用不同的滤波器来创建系数图像的不同部分。复合图像允许对分割图像进行联合，速率失真优化编码。联合编码最佳地分配图像段的变换之间的比特，并产生容易扩展的比特流。

3. 发明授权

US06236757B1 Joint coding method for images and videos with multiple arbitrarily shaped segments or objects 失效
标题翻译：具有多个任意形状的段或对象的图像和视频的联合编码方法
公开(公告)号：US06236757B1
公开(公告)日：2001-05-22
申请号：US09158659
申请日：1998-09-22
申请人： Wenjun Zeng , Jin Li , Shaw-Min Lei
发明人： Wenjun Zeng , Jin Li , Shaw-Min Lei
IPC分类号： G06K936
CPC分类号： H04N19/649 , H04N19/115 , H04N19/122 , H04N19/146 , H04N19/147 , H04N19/17 , H04N19/20 , H04N19/63 , H04N19/635 , H04N19/96
摘要： An adaptive image coding method and system are disclosed. The system accepts an input image, divides it into image segments, and assigns each segment to a wavelet transform filter from a bank of such filters for transformation. The bank preferably comprises filters adapted for different types of image content, e.g., sharp edges, slowly-varying contours, etc. Filters are preferably assigned so as to produce minimal distortion for their assigned image segments at a given target bit rate. Each filter produces transform coefficients for its segment using scale and subband settings common to the entire image. The valid coefficients for each segment are then combined in a composite wavelet coefficient image, which resembles a single wavelet transform of an entire image—although different filters are used to create different portions of the coefficient image. The composite image allows joint, rate-distortion optimized coding for a segmented image. Joint coding allocates bits between the transforms of the image segments optimally, and produces an easily scaleable bitstream.
摘要翻译：公开了一种自适应图像编码方法和系统。系统接受输入图像，将其分割成图像段，并将每个分段分配给一个这样的滤波器组的小波变换滤波器进行变换。银行优选地包括适用于不同类型的图像内容的滤波器，例如尖锐边缘，缓慢变化的轮廓等。优选地分配滤波器，以便以给定的目标比特率为其分配的图像段产生最小的失真。每个滤波器产生使用与整个图像共同的比例和子带设置来对其片段进行变换系数。然后将每个段的有效系数组合在复合小波系数图像中，其类似于整个图像的单个小波变换 - 尽管使用不同的滤波器来创建系数图像的不同部分。复合图像允许对分割图像进行联合，速率失真优化编码。联合编码最佳地分配图像段的变换之间的比特，并产生容易扩展的比特流。

4. 发明授权

US06505299B1 Digital image scrambling for image coding systems 有权
标题翻译：用于图像编码系统的数字图像加扰
公开(公告)号：US06505299B1
公开(公告)日：2003-01-07
申请号：US09260193
申请日：1999-03-01
申请人： Wenjun Zeng , Shaw-Min Lei
发明人： Wenjun Zeng , Shaw-Min Lei
IPC分类号： G06F0124
CPC分类号： H04N7/1675 , H04N19/51 , H04N19/517 , H04N19/60 , H04N19/645 , H04N19/88 , H04N21/23476
摘要： Methods and apparatus for encryption and decryption of digital images are disclosed. A preferred embodiment operates on an image frame after that frame has undergone a space-frequency transform operation, such as a block DCT or wavelet transform, and before the frame is passed to a bitstream coder for entropy coding. The transform coefficient map is subjected to one or more encryption operations that render a subsequently decoded (but not decrypted) image incomprehensible. These operations are designed to operate with low computational overhead and with only minor effects on compressed bit rate. They also allow secure transcoding at intermediate routers of the transmission channels without the cryptographic key. In one operation, the sign bits of transform coefficients are scrambled. In another operation, two dimensional blocks of coefficients from a common subband are shuffled and/or rotated to pseudorandom locations and orientations. In yet another operation, coefficients occupying a common “subband”, but taken from different DCT blocks, are shuffled. Still another operation shuffles motion vectors and/or scrambles sign bits for motion vector coefficients. These operations perturb the data as it will appear visually, without greatly perturbing the entropy of the data as presented to an entropy coder.
摘要翻译：公开了用于数字图像的加密和解密的方法和装置。优选实施例在帧经历了诸如块DCT或小波变换之类的空间频率变换操作之后，以及在帧被传送到用于熵编码的比特流编码器之前，对图像帧进行操作。对变换系数映射进行一个或多个使后续解码（但不解密）图像不可理解的加密操作。这些操作被设计为以低计算开销运行，并且对压缩比特率只有较小的影响。它们还允许在传输信道的中间路由器处进行安全的代码转换，而没有加密密钥。在一个操作中，变换系数的符号位被加扰。在另一个操作中，来自公共子带的二维系数块被混洗和/或旋转到伪随机位置和取向。在另一个操作中，占用共同的“子带”但是从不同DCT块获取的系数被混洗。另一个操作将运动矢量和/或加扰运动矢量系数的符号位混洗。这些操作会扰乱数据，因为它将在视觉上出现，而不会大大扰乱呈现给熵编码器的数据的熵。

5. 发明授权

US06356665B1 Quad-tree embedded image compression and decompression method and apparatus 失效
标题翻译：四树嵌入式图像压缩和解压缩方法及装置
公开(公告)号：US06356665B1
公开(公告)日：2002-03-12
申请号：US09209318
申请日：1998-12-09
申请人： Shaw-Min Lei , Jin Li
发明人： Shaw-Min Lei , Jin Li
IPC分类号： G06K936
CPC分类号： G06T9/40 , H04N1/646 , H04N19/186 , H04N19/647 , H04N19/96
摘要： A quad-tree embedded image coding technique is used in combination with a bit-plane encoding technique to provide an efficient and low complexity embedded image coding system. A simple quad-tree method identifies coefficients as significant, insignificant, or refinement at each successive quantization level. The quad-tree technique is used instead of the zero-tree or hierarchical tree used in previous encoders.
摘要翻译：四轴嵌入式图像编码技术与位平面编码技术结合使用，以提供高效和低复杂度的嵌入式图像编码系统。简单的四叉树方法将每个连续量化级别的系数识别为显着的，无关紧要的或细化的。使用四叉树技术代替在先前的编码器中使用的零树或分层树。

6. 发明授权

US06625321B1 Embedded image coder with rate-distortion optimization 失效
标题翻译：具有速率失真优化的嵌入式图像编码器
公开(公告)号：US06625321B1
公开(公告)日：2003-09-23
申请号：US09016571
申请日：1998-01-30
申请人： Jin Li , Shaw-Min Lei
发明人： Jin Li , Shaw-Min Lei
IPC分类号： G06K936
CPC分类号： H04N19/61 , H04N19/10 , H04N19/115 , H04N19/13 , H04N19/146 , H04N19/147 , H04N19/63
摘要： A rate-distortion optimized embedding (RDE) coder optimizes rate-distortion performance by coding information bits in the order of their R-D slope. RDE allocates the available coding bits first to the information bit with the steepest R-D slope, which indicates the largest distortion decrease per coding bit. The resultant RDE bitstream can be truncated at any point and still maintain an optimal R-D performance. To avoid the overhead of coding order transmission, an expected R-D slope is calculated by both the encoder and the decoder from previous RDE coded bits. A probability estimation table from a QM arithmetic coder allows the R-D slope to be derived using a lookup table operation. The rate-distortion optimised embedding (RDE) coder significantly improves the coding efficiency over a wide range of bit rates.
摘要翻译：速率失真优化嵌入（RDE）编码器以其R-D斜率的顺序对信息位进行编码来优化速率失真性能。 RDE首先将可用的编码位分配给具有最陡的R-D斜率的信息位，这表示每编码位最大的失真减小。所得到的RDE比特流可以在任何点被截断，并且仍然保持最佳的R-D性能。为了避免编码顺序传输的开销，由编码器和解码器由先前的RDE编码位计算预期的R-D斜率。来自QM算术编码器的概率估计表允许使用查找表操作导出R-D斜率。速率失真优化嵌入（RDE）编码器在宽范围的比特率下显着提高了编码效率。

7. 发明授权

US06233357B1 Arbitrary shape wavelet transform with phase alignment 失效
标题翻译：具有相位对准的任意形状小波变换
公开(公告)号：US06233357B1
公开(公告)日：2001-05-15
申请号：US09110979
申请日：1998-07-07
申请人： Jin Li , Shaw-Min Lei
发明人： Jin Li , Shaw-Min Lei
IPC分类号： G06K936
CPC分类号： H04N19/649 , H04N19/63
摘要： An arbitrary shape wavelet transform with phase alignment (ASWP) is used to transform an arbitrary shaped object in an image. The phase of an odd tap wavelet filter is aligned so that a low pass filter is always centered at an even index, and a high pass filter is always centered at an odd index. The phase of an even tap wavelet filter is aligned so that the low pass filter and the high pass filter are both centered at index 2i+0.5, i.e., a half index past the even index. The objects for odd tap wavelet filters are each separately symmetrically extended by mirroring the objects from the opposite ends but not mirroring the end pixels. The objects for the even tap filter is symmetrically extended by mirroring the pixels from the opposite ends of the objects including mirroring the end pixels. The phase adjusted-symmetrically extended objects are then transformed.
摘要翻译：使用具有相位对准（ASWP）的任意形状小波变换来变换图像中的任意成形对象。对齐抽头小波滤波器的相位被对准，使得低通滤波器总是以均匀的索引为中心，并且高通滤波器总是以奇数索引为中心。对均匀抽头小波滤波器的相位进行比对，使得低通滤波器和高通滤波器都以索引2i + 0.5为中心，即超过偶数指数的一半索引。奇数抽头小波滤波器的对象通过从相对端镜像对象而不是镜像终端像素而分别对称地扩展。偶数抽头滤波器的对象通过镜像来自对象的相对端的像素对称地扩展，包括镜像终端像素。然后相位调整对称扩展的对象被变换。

8. 发明授权

US06463177B1 Dynamic management of embedded coded images in a digital storage device 失效
标题翻译：嵌入式编码图像在数字存储设备中的动态管理
公开(公告)号：US06463177B1
公开(公告)日：2002-10-08
申请号：US09186343
申请日：1998-11-04
申请人： Jin Li , Shaw-Min Lei
发明人： Jin Li , Shaw-Min Lei
IPC分类号： G06K936
CPC分类号： H04N5/772 , H04N5/907 , H04N5/9261 , H04N19/147 , H04N19/30 , H04N19/60
摘要： An embedded coding scheme is used to dynamically changes the size of compressed images and as a result image quality according to the number of stored pictures. As more images are captured, the image storage device makes room for newly captured images by truncating existing compressed embedded coded bitstreams of previously stored images. The embedded digital image storage device can thus store a virtually unlimited number of images by dynamically trading-off between the number of stored images and image quality.
摘要翻译：使用嵌入编码方案来动态地改变压缩图像的大小，并且根据所存储的图像的数量作为结果图像质量。当捕获更多的图像时，图像存储设备通过截断先前存储的图像的现有压缩的嵌入的编码比特流，为新捕获的图像腾出空间。因此，嵌入式数字图像存储装置可以通过在所存储的图像数量和图像质量之间进行动态折中来存储几乎无限数量的图像。

9. 发明授权

US10063876B2 Method and apparatus for removing redundancy in motion vector predictors 有权
公开(公告)号：US10063876B2
公开(公告)日：2018-08-28
申请号：US14123200
申请日：2012-06-12
申请人： Jian-Liang Lin , Yi-Wen Chen , Yu-Wen Huang , Shaw-Min Lei
发明人： Jian-Liang Lin , Yi-Wen Chen , Yu-Wen Huang , Shaw-Min Lei
IPC分类号： H04N7/36 , H04N19/513 , H04N19/52 , H04N19/119 , H04N19/625 , H04N19/70
CPC分类号： H04N19/513 , H04N19/119 , H04N19/52 , H04N19/625 , H04N19/70
摘要： A method and apparatus derive a motion vector predictor (MVP) for a current block in an Inter, Merge, or Skip mode. Embodiments according to the present invention determine redundant MVP candidates according to a non-MV-value based criterion. The redundant MVP candidates are then removed from the MVP candidate set. In other embodiments according to the present invention, motion IDs are assigned to MVP candidates to follow the trail of motion vectors associated with the MVP candidate. An MVP candidate having a same motion ID as a previous MVP is redundant and can be removed from the MVP candidate set. In yet another embodiment, redundant MVP candidates correspond to one or more of the MVP candidates that cause the second 2N×N or N×2N PU to be merged into a 2N×2N PU are removed from the MVP candidate set.

10. 发明授权

US09872015B2 Method and apparatus for improved in-loop filtering 有权
公开(公告)号：US09872015B2
公开(公告)日：2018-01-16
申请号：US13992472
申请日：2012-04-20
申请人： Chih-Ming Fu , Ching-Yeh Chen , Chia-Yang Tsai , Yu-Wen Huang , Shaw-Min Lei
发明人： Chih-Ming Fu , Ching-Yeh Chen , Chia-Yang Tsai , Yu-Wen Huang , Shaw-Min Lei
IPC分类号： H04N7/12 , H04N11/02 , H04N11/04 , H04N19/117 , H04N19/70 , H04N19/177 , H04N19/463 , H04N19/82
CPC分类号： H04N19/169 , H04N19/117 , H04N19/177 , H04N19/463 , H04N19/70 , H04N19/82
摘要： Video decoding and encoding with in-loop processing of reconstructed video are disclosed. At the decoder side, a flag is received from the video bitstream and according to the flag, information associated with in-loop filter parameters is received either from a data payload in the video bitstream to be shared by two or more coding blocks or individual coding block data in the video bitstream. At the encoder side, information associated with the in-loop filter parameters is incorporated either in a data payload in a video bitstream to be shared by two or more coding blocks or interleaved with individual coding block data in the video bitstream according to a flag. The data payload in the video bitstream is in a picture level, Adaptation Parameter Set (APS), or a slice header.

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