公开(公告)号：US08204329B2

公开(公告)日：2012-06-19

申请号：US12486519

申请日：2009-06-17

申请人： Ximin Zhang ,  Ming-Chang Liu

发明人： Ximin Zhang ,  Ming-Chang Liu

IPC分类号： G06K9/40

CPC分类号： G06T5/008

摘要： A low cost image quality enhancement method to be utilized in an ordinary consumer camera and for post processing of an existing image database is described herein. The quality enhancement is transferred into an adaptive intensity stretching process in the YUV domain. A different enhancement process is designed for a luminance (Y) channel and chrominance (UV) channel. The parameters in the enhancement process are estimated based on the contents of the image. After the stretching-based enhancement, an adaptive unsharp masking process is applied to the luminance data. The quality is significantly improved for the images shot under unfavorable conditions.

摘要翻译： 这里描述了在普通消费者相机中使用的低成本图像质量增强方法和用于对现有图像数据库进行后处理的方法。 质量增强转移到YUV域中的自适应强度拉伸过程。 为亮度（Y）通道和色度（UV）通道设计了不同的增强过程。 基于图像的内容来估计增强处理中的参数。 在基于拉伸的增强之后，对亮度数据应用自适应锐化掩蔽处理。 在不利条件下拍摄的图像质量明显提高。

公开(公告)号：US08090022B2

公开(公告)日：2012-01-03

申请号：US11620598

申请日：2007-01-05

申请人： Ximin Zhang

发明人： Ximin Zhang

IPC分类号： H04N11/02 ,  H04N11/04 ,  G06K9/36

CPC分类号： H04N19/17 ,  H04N19/124 ,  H04N19/139 ,  H04N19/159 ,  H04N19/176 ,  H04N19/177 ,  H04N19/513 ,  H04N19/61

摘要： A video coding system is provided including generating a motion vector for a macro block in a picture, the motion vectors indicative of displacement of an object in the macro block; grouping a cluster of the motion vectors; and adjusting a dynamic quantization parameter modulation of a subsequent picture based on the grouping for displaying the displacement of the object in the subsequent picture.

摘要翻译： 提供了一种视频编码系统，包括生成图像中的宏块的运动矢量，指示宏块中的对象的位移的运动矢量; 对一组运动矢量进行分组; 以及基于用于显示随后图像中的对象的位移的分组来调整后续图像的动态量化参数调制。

公开(公告)号：US20110135003A1

公开(公告)日：2011-06-09

申请号：US13027027

申请日：2011-02-14

申请人： Ximin Zhang

发明人： Ximin Zhang

IPC分类号： H04N7/26

CPC分类号： H04N19/577 ,  H04N19/523

摘要： A method of half-pixel interpolation and quarter-pixel interpolation are adapted for reducing the impact of aliasing within motion estimation. To estimate a motion vector with quarter-pixel accuracy more efficiently, the improved method is able to skip checking certain points using the uni-modal assumption. In an embodiment, a diamond based refinement is implemented. Within the diamond based refinement are half-pel refinement and quarter-pel refinements. Furthermore, within the half-pel refinement are methods for on-the-fly interpolation and pre-computed interpolation. Within quarter-pel refinement, the method depends on whether four neighbor half-pel points are checked or just one or two half-pel points. Moreover, within each of the different embodiments is the ability to focus on quality or speed wherein different methods are implemented to maximize the desired function. In another embodiment, a square based refinement is implemented.

摘要翻译： 半像素内插和四分之一像素插值的方法适用于减少运动估计中混叠的影响。 为了更有效地估计四分之一像素精度的运动矢量，改进的方法能够使用单模假设跳过检查某些点。 在一个实施例中，实现了基于钻石的细化。 在基于钻石的细化中，是半像素细化和四分之一像素细化。 此外，在半像素细化中是用于即时插值和预先计算的内插的方法。 在四分之一像素细化中，该方法取决于是检查四个相邻半像素点还是仅检测一个或两个半像素点。 此外，在每个不同的实施例中，能够专注于质量或速度，其中实施不同的方法以最大化期望的功能。 在另一个实施例中，实现了基于平方的细化。

公开(公告)号：US07912129B2

公开(公告)日：2011-03-22

申请号：US11378148

申请日：2006-03-16

申请人： Ximin Zhang

发明人： Ximin Zhang

IPC分类号： H04B1/66

CPC分类号： H04N19/577 ,  H04N19/523

摘要： A method of half-pixel interpolation and quarter-pixel interpolation are adapted for reducing the impact of aliasing within motion estimation. To estimate a motion vector with quarter-pixel accuracy more efficiently, the improved method is able to skip checking certain points using the uni-modal assumption. In an embodiment, a diamond based refinement is implemented. Within the diamond based refinement are half-pel refinement and quarter-pel refinements. Furthermore, within the half-pel refinement are methods for on-the-fly interpolation and pre-computed interpolation. Within quarter-pel refinement, the method depends on whether four neighbor half-pel points are checked or just one or two half-pel points. Moreover, within each of the different embodiments is the ability to focus on quality or speed wherein different methods are implemented to maximize the desired function. In another embodiment, a square based refinement is implemented.

摘要翻译： 半像素内插和四分之一像素插值的方法适用于减少运动估计中混叠的影响。 为了更有效地估计四分之一像素精度的运动矢量，改进的方法能够使用单模假设跳过检查某些点。 在一个实施例中，实现了基于钻石的细化。 在基于钻石的细化中，是半像素细化和四分之一像素细化。 此外，在半像素细化中是用于即时插值和预先计算的内插的方法。 在四分之一像素细化中，该方法取决于是检查四个相邻半像素点还是仅检测一个或两个半像素点。 此外，在每个不同的实施例中，能够专注于质量或速度，其中实施不同的方法以最大化期望的功能。 在另一个实施例中，实现了基于平方的细化。

公开(公告)号：US20100067818A1

公开(公告)日：2010-03-18

申请号：US12283855

申请日：2008-09-15

申请人： Ximin Zhang ,  Ming-Chang Liu

发明人： Ximin Zhang ,  Ming-Chang Liu

IPC分类号： G06K9/40

CPC分类号： G06T3/403

摘要： A low complexity upscaling method to generate higher resolution image and video with high quality is described herein. Natural edge smoothness and sharpness are preserved while overshooting artifacts and the “edge dilation” problem are eliminated. To obtain edge smoothness and remove jaggy artifacts along the edge, a bi-directional filtering which is based on two orthogonal directions is used to generate higher resolution pixels. The direction close to the edge direction is heavily weighted, and the direction far from the edge direction is lightly weighted. The weight of each direction is determined by the developed directional vector difference measurement method. To eliminate the overshooting artifacts and solving the thick edge problem, a dual-sided interpolation method is implemented. By using the dual-sided interpolation method, the interpolation result is pushed towards a dominant transition desired location which removes overshooting artifacts. A thin and sharp edge is obtained instead of a blurred, thick edge.

摘要翻译： 这里描述了一种用于产生高质量的更高分辨率图像和视频的低复杂度升频方法。 保留自然边缘的平滑度和清晰度，同时消除过冲人造物和“边缘扩张”问题。 为了获得边缘平滑度并沿着边缘去除锯齿状伪影，使用基于两个正交方向的双向滤波来产生更高分辨率的像素。 靠近边缘方向的方向是重度加权的，远离边缘方向的方向被轻重加权。 每个方向的重量由开发的方向矢量差测量方法确定。 为了消除过冲伪影和解决粗边缘问题，实现了双面插值方法。 通过使用双面插值方法，将插值结果推向主导转移期望位置，从而消除过冲伪影。 获得薄而锋利的边缘而不是模糊的粗边。

公开(公告)号：US20080165278A1

公开(公告)日：2008-07-10

申请号：US11649401

申请日：2007-01-04

申请人： Ximin Zhang

发明人： Ximin Zhang

IPC分类号： H04N7/01 ,  H04N11/02

CPC分类号： H04N5/142 ,  H04N5/144 ,  H04N7/012 ,  H04N7/0142

摘要： A method of effectively de-interlacing a sequence of interlace-scanned pictures receives the sequence of pictures, forms a received sequence, and performs motion detection upon the received sequence. The method generates a first threshold for measuring the accuracy of the motion detection, and measures the accuracy of the motion detection, thereby forming a first accuracy measurement. The accuracy of the motion detection is measured by using a difference calculation. The method de-interlaces a picture in the received sequence by using the first accuracy measurement. The de-interlacing is motion adaptive.

摘要翻译： 一种隔行扫描图像序列的有效地去隔行扫描的方法接收图像序列，形成接收到的序列，并且在接收到的序列上执行运动检测。 该方法产生用于测量运动检测的精度的第一阈值，并且测量运动检测的精度，从而形成第一精度测量。 通过使用差分计算来测量运动检测的精度。 该方法通过使用第一精度测量来解码接收序列中的图像。 去隔行扫描是运动自适应的。

公开(公告)号：US20080144951A1

公开(公告)日：2008-06-19

申请号：US11638810

申请日：2006-12-14

申请人： Ximin Zhang

发明人： Ximin Zhang

IPC分类号： H04B1/66 ,  G06K9/36

CPC分类号： H04N19/122 ,  H04N19/126 ,  H04N19/14 ,  H04N19/176 ,  H04N19/61

摘要： A system and method for effectively performing an adaptive encoding procedure includes a texture analyzer that initially determines texture characteristics for blocks of input image data. An image transformer converts the blocks of image data into sets of coefficients that represent the various blocks. A block categorizer utilizes the texture characteristics to associate texture categories with the sets of coefficients from the various blocks. Deadzone tables are provided for storing deadzone values that define deadzone regions for performing appropriate quantization procedures. A quantizer may then access the deadzone values from the deadzone tables to adaptively convert the coefficients into quantized coefficients according to their corresponding texture characteristics.

摘要翻译： 用于有效执行自适应编码过程的系统和方法包括纹理分析器，其最初确定输入图像数据块的纹理特征。 图像变换器将图像数据块转换为表示各种块的系数集合。 块分类器利用纹理特征将纹理类别与来自各种块的系数集相关联。 死区表用于存储定义死区的死区值，用于执行适当的量化过程。 然后，量化器可以从死区表访问死区值，以根据其对应的纹理特征将系数自适应地转换为量化系数。

公开(公告)号：US20070199011A1

公开(公告)日：2007-08-23

申请号：US11356832

申请日：2006-02-17

申请人： Ximin Zhang ,  Takao Yamazaki

发明人： Ximin Zhang ,  Takao Yamazaki

IPC分类号： H04N7/16

CPC分类号： H04N19/58 ,  H04N19/124 ,  H04N19/142 ,  H04N19/154 ,  H04N19/17 ,  H04N19/177 ,  H04N19/553 ,  H04N19/61

摘要： A video coding system receives as input a video sequence including a series of picture frames. One or more long term references are selected from the input video sequence, at least one of the long term references is a long term look-behind reference frame. Short term reference frames are also selected according to the standards. The frames are then re-ordered for encoding such that the long term look-behind reference is encoded first, followed by the remaining frames according to the conventional order dictated by the standards. Each frame is encoded according to motion estimation and motion compensation, and an intra prediction method that incorporates the use of the long term look-behind reference frame. Further, encoding of each long term look-behind reference frame includes quantization according to a controlled bit-rate. The bit-rate is increased for quantization of each long term look-behind reference frame, thereby increasing its quality. For each other frame, the bit rate is maintained at a normalized level.

摘要翻译： 视频编码系统作为输入接收包括一系列相框的视频序列。 从输入视频序列中选择一个或多个长期参考文献，长期参考文献中的至少一个是长期查看参考帧。 也可根据标准选择短期参考系。 然后将帧重新编码以进行编码，使得首先编码长期的后备参考，然后根据由标准规定的常规顺序来跟随其余的帧。 每个帧根据运动估计和运动补偿进行编码，并且内帧预测方法结合使用长期查看参考帧。 此外，每个长期查看参考帧的编码包括根据受控比特率的量化。 对于每个长期查看参考帧的量化，比特率增加，从而提高其质量。 对于每个其他帧，比特率保持在归一化水平。

公开(公告)号：US07092442B2

公开(公告)日：2006-08-15

申请号：US10325986

申请日：2002-12-19

申请人： Ximin Zhang ,  Anthony Vetro ,  Huifang Sun

发明人： Ximin Zhang ,  Anthony Vetro ,  Huifang Sun

IPC分类号： H04N7/12

CPC分类号： H04N19/137 ,  H04N19/112 ,  H04N19/172

摘要： A method adaptively encodes a video including a sequence of images, where each image is a picture of two fields. Each image is first separated into a top-field and a bottom-field. Motion activity is extracted from the top-field and the bottom-field, and each image is encoded using either frame encoding or field encoding depending on the extracted motion activity.

摘要翻译： 一种自适应地编码包括图像序列的视频，其中每个图像是两个场的图像。 每个图像首先分为顶场和底场。 从顶场和底场提取运动活动，并且根据提取的运动活动，使用帧编码或场编码对每个图像进行编码。