公开(公告)号：US20080159386A1

公开(公告)日：2008-07-03

申请号：US11768688

申请日：2007-06-26

申请人： Yung-lyul LEE ,  Hyun-wook Park

发明人： Yung-lyul LEE ,  Hyun-wook Park

IPC分类号： H04B1/66

CPC分类号： H04N19/86 ,  H04N19/117 ,  H04N19/162 ,  H04N19/176 ,  H04N19/436 ,  H04N19/46 ,  H04N19/70 ,  H04N19/82

摘要： A loop-filtering method for reducing quantization effect generated when an image data is encoded and decoded, and an apparatus therefor. The loop-filtering method includes the steps of extracting a flag indicating whether the image data requires loop-filtering using the distribution of inverse quantized coefficients (IQCs) of an inverse quantized image data and a motion vector indicating the difference between the previous frame and the current frame. The image data corresponding to the flag is then filtered by a predetermined method if the extracted flag indicates a need for the loop-filtering. Using the flags and an adaptive filter reduces the quantization effect and is useful to reduce the amount of computation required for the filtering. Also, the filtering can be performed through parallel processing without multiplication and division, so that the complexity of hardware can be reduced.

摘要翻译： 一种用于减少图像数据被编码和解码时产生的量化效应的环路滤波方法及其装置。 循环滤波方法包括以下步骤：提取指示图像数据是否需要使用逆量化图像数据的逆量化系数（IQC）的分布的循环滤波的标志和指示前一帧和前一帧之间的差的运动矢量 当前帧。 如果所提取的标志指示需要循环滤波，则与标志相对应的图像数据然后通过预定方法进行过滤。 使用标志和自适应滤波器可以减少量化效应，有助于减少滤波所需的计算量。 此外，可以通过并行处理而不进行乘法和除法来执行滤波，从而可以降低硬件的复杂度。

公开(公告)号：US20060291563A1

公开(公告)日：2006-12-28

申请号：US11356933

申请日：2003-09-02

申请人： Jeong-hoon Park ,  Yung-lyul Lee ,  Yong-je Kim

发明人： Jeong-hoon Park ,  Yung-lyul Lee ,  Yong-je Kim

IPC分类号： H04N11/04 ,  H04N7/12 ,  H04B1/66 ,  H04N11/02

CPC分类号： H04N19/59 ,  H04N19/43 ,  H04N19/523 ,  H04N19/61

摘要： An interpolation method and apparatus for motion vector compensation are provided. The interpolation method includes calculating a horizontal sum of values of a plurality of half-pixels adjacent to or near a predetermined quarter-pixel in the horizontal direction by giving predetermined weights to each of the half-pixels, and adding the results; calculating a vertical sum of values of a second plurality of half-pixels adjacent to or near the quarter-pixel in the vertical direction by giving predetermined weights to each of the half-pixels, and adding the results; and calculating an integer value of the quarter-pixel value using the vertical and horizontal sums. According to an aspect of the invention, more consistent and reliable compensation for error in a motion vector may be achieved, thereby increasing the efficiency of motion vector compensation.

摘要翻译： 提供了一种用于运动矢量补偿的插值方法和装置。 插值方法包括通过对每个半像素给出预定的权重来计算与水平方向相邻或接近预定四分之一像素的多个半像素的值的水平和，并将结果相加; 通过对每个半像素给出预定的权重来计算与垂直方向相邻或靠近四分之一像素的第二多个半像素的值的垂直和，并且添加结果; 以及使用垂直和水平和计算四分之一像素值的整数值。 根据本发明的一个方面，可以实现对运动矢量中的误差的更一致和可靠的补偿，由此增加运动矢量补偿的效率。

公开(公告)号：US20060109911A1

公开(公告)日：2006-05-25

申请号：US11256188

申请日：2005-10-24

申请人： Euee-S Jang ,  Yung-Lyul Lee ,  Sun-Young Lee ,  Sung-Won Park ,  Jong-Woo Won ,  Yong-Ho Cho ,  Chung-Ku Lee

发明人： Euee-S Jang ,  Yung-Lyul Lee ,  Sun-Young Lee ,  Sung-Won Park ,  Jong-Woo Won ,  Yong-Ho Cho ,  Chung-Ku Lee

IPC分类号： H04N11/04 ,  H04N7/12 ,  H04B1/66 ,  H04N11/02

CPC分类号： H04N19/18 ,  H04N19/11 ,  H04N19/12 ,  H04N19/15 ,  H04N19/176 ,  H04N19/46 ,  H04N19/593 ,  H04N19/61

摘要： There are provided selective prediction encoding and decoding methods and selective prediction encoding and decoding devices. The selective prediction encoding device selects and performs one of an AC/DC prediction encoding method and an intra prediction encoding method which corresponds to the smaller of code amount from AC/DC prediction and an amount of AVC intra coding, records information indicating the selected encoding method in a header of a bit stream, and transmits the bit stream to the selective prediction decoding device. The selective prediction decoding device decodes the transmitted bit stream by the use of a decoding process corresponding to the information recorded in the header. Accordingly, it is possible to improve compression ratio and image quality by using the selective prediction encoding and decoding methods.

摘要翻译： 提供选择性预测编码和解码方法以及选择性预测编码和解码装置。 选择性预测编码装置选择并执行AC / DC预测编码方式和对应于AC / DC预测的代码量越小和AVC帧内编码量越小的帧内预测编码方式之一，记录表示选择编码的信息 方法，并将比特流发送到选择性预测解码装置。 选择性预测解码装置通过使用与记录在头部中的信息相对应的解码处理对发送的比特流进行解码。 因此，可以通过使用选择性预测编码和解码方法来提高压缩率和图像质量。

公开(公告)号：US07020123B2

公开(公告)日：2006-03-28

申请号：US09783129

申请日：2001-02-15

申请人： Dong-seek Park ,  Jeong-hoon Park ,  Yung-lyul Lee ,  John Villasenor ,  Adam H. Li ,  Fang Liu

发明人： Dong-seek Park ,  Jeong-hoon Park ,  Yung-lyul Lee ,  John Villasenor ,  Adam H. Li ,  Fang Liu

IPC分类号： H04B7/216

CPC分类号： H04L1/0041 ,  H04L1/0061 ,  H04L1/0072 ,  H04L1/0083 ,  H04L69/22

摘要： A wireless packetization apparatus for transmitting and/or receiving multimedia data including video data in a radio transmitting/receiving system, and a method thereof are provided. According to the present invention, error resilience can be increased by adding error protection codes to one portion and a plurality of portions of multimedia-related header information, respectively, when multimedia data such as video data requiring real time or low delay are transmitted and received in a wireless environment, and a packet drop rate can thereby be reduced. Also, information can be more precise recovered by inserting length identifier and length information on an information region into the header.

公开(公告)号：US20050135486A1

公开(公告)日：2005-06-23

申请号：US10945874

申请日：2004-09-22

申请人： Yung-lyul Lee

发明人： Yung-lyul Lee

IPC分类号： H04N7/30 ,  H04N7/12 ,  H04N7/26

CPC分类号： H04N19/103 ,  H04N19/159 ,  H04N19/196 ,  H04N19/40 ,  H04N19/513

摘要： A transcoding method, medium, and apparatus for transforming a coded video format into another coded video format. The transcoding method includes decoding a bitstream encoded using a first coding method to output data in a pixel domain and motion vector and macroblock information for each of macroblock of the bitstream, and performing motion compensation using the motion vector and macroblock information to encode the data in the pixel domain using a second coding method.

摘要翻译： 一种用于将编码视频格式转换为另一编码视频格式的代码转换方法，介质和装置。 代码转换方法包括对使用第一编码方法编码的比特流进行解码，以输出像素域中的数据，以及用于比特流的每个宏块的运动矢量和宏块信息，并且使用运动向量和宏块信息来执行运动补偿以将数据编码 像素域使用第二编码方法。

公开(公告)号：US06226050B1

公开(公告)日：2001-05-01

申请号：US09054407

申请日：1998-04-03

申请人： Yung-lyul Lee

发明人： Yung-lyul Lee

IPC分类号： H04N521

CPC分类号： H04N19/86 ,  H04N5/21

摘要： A gradient is calculated at each pixel of the image data to be filtered using a one-dimensional horizontal gradient operator of 1×2 size and a one-dimensional vertical gradient operator of 2×1 size, each of the gradient operators having a weighted value (1,−1). The absolute value of the calculated gradient is then compared with a predetermined threshold value to generate a binary value. This gradient calculation and comparison with a threshold is repeated for pixel blocks having a predetermined size to generate a binary edge map with respect to a whole block. A filter window of a predetermined size is then applied to the generated binary edge map to determine whether edges are present in the filter window. If no edges are present in the filter window, then the pixel values of the corresponding filter window pixel are filtered pixel-by-pixel by using a predetermined first set of weighted values to generate a new pixel value. On the other hand, if edges are present in the filter window, then (subject to an exception) the pixel values of the corresponding filter window are filtered pixel-by-pixel by using a predetermined second set of weighted values to generate a new pixel value. The exception is that no filtering is performed if the pixel located at the center of the filter window represents an edge. As a result of this processing, ringing noise is removed from a block-based processed image, enhancing the quality of the decompressed image.

摘要翻译： 使用1x2尺寸的一维水平梯度算子和2x1尺寸的一维垂直梯度算子，在要滤波的图像数据的每个像素处计算梯度，每个梯度算子具有加权值（1， 1）。 然后将计算出的梯度的绝对值与预定阈值进行比较以产生二进制值。 针对具有预定尺寸的像素块重复该梯度计算和与阈值的比较，以生成关于整个块的二进制边缘图。 然后将预定大小的滤波器窗口应用于生成的二进制边缘图，以确定边缘是否存在于滤波器窗口中。 如果滤波器窗口中没有边缘，则通过使用预定的第一组加权值逐个像素地对对应的滤波器窗口像素的像素值进行滤波，以生成新的像素值。 另一方面，如果边缘存在于滤波器窗口中，则（通过异常），通过使用预定的第二组加权值逐个像素地对相应的滤波器窗口的像素值进行滤波，以产生新的像素 值。 例外是，如果位于过滤器窗口中心的像素表示边缘，则不执行过滤。 作为该处理的结果，从基于块的处理的图像中去除振铃噪声，提高解压缩图像的质量。