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    • 6. 发明授权
    • Image processing apparatus and method for format conversion
    • 用于格式转换的图像处理装置和方法
    • US08072541B2
    • 2011-12-06
    • US12382124
    • 2009-03-09
    • Akira NakagawaShunsuke Kobayashi
    • Akira NakagawaShunsuke Kobayashi
    • H04N11/20
    • H04N9/642H04N19/59H04N19/61H04N19/85
    • A signal processing apparatus converts interlaced 4:2:2-format video signals including a luminance component and two chroma components into interlaced 4:2:0 format video signals. A downsampling low-pass filter has such a group delay that a modulo-1 remainder of the group delay at frequency ω=0 is substantially equal to 0.25. The downsampling low-pass filter is designed together with an associated upsampling low-pass filter such that the first downsampling low-pass filter and the upsampling low-pass filter substantially satisfy perfect reconstruction filter bank condition, and such that a sum of the group delay of the first downsampling low-pass filter and a group delay of a normalized filter obtained by making the sum of all the coefficients of the upsampling low-pass filter equal to 1 is substantially equal to an integer number at frequency ω=0.
    • 信号处理装置将包括亮度分量和两个色度分量的隔行4:2:2格式的视频信号转换为隔行4:2:0格式的视频信号。 下采样低通滤波器具有这样的组延迟,使得频率ω= 0时的组延迟的模1余数基本上等于0.25。 下采样低通滤波器与相关联的上采样低通滤波器一起设计,使得第一下采样低通滤波器和上采样低通滤波器基本上满足完美重构滤波器组条件,并且使得组延迟的和 的第一下采样低通滤波器和通过使上采样低通滤波器的所有系数的和等于1而获得的归一化滤波器的群延迟基本上等于频率ω= 0处的整数。
    • 10. 发明申请
    • Method, apparatus, and system for processing moving image
    • 用于处理运动图像的方法,装置和系统
    • US20090238261A1
    • 2009-09-24
    • US12292020
    • 2008-11-10
    • Susarla Lalitha BhavaniAkira NakagawaShunsuke Kobayashi
    • Susarla Lalitha BhavaniAkira NakagawaShunsuke Kobayashi
    • H04N5/917
    • H04N19/573H04N19/70
    • A moving image processing system includes an encoding apparatus encoding a moving image by encoding a picture order count (POC) while inserting a recovery point, and a decoding apparatus decoding the moving image encoded by the encoding apparatus. The encoding apparatus includes an insertion permission/rejection determining unit that determines whether a decoded frame is a reference frame and its frame number from an instantaneous decoding refresh frame is a positive integer times as large as a number of reference frames within a POC cycle, and a recovery point inserting unit that inserts the recovery point into the frame depending on a result of determination by the insertion permission/rejection determining unit. The decoding apparatus includes a POC decoding unit that decodes the POC by executing an initializing process such that the frame number within the POC cycle used in decoding the POC becomes zero, when decoding by random accessing is started.
    • 运动图像处理系统包括:通过编码图像顺序计数(POC)同时插入恢复点来编码运动图像的编码装置;以及解码装置,对由编码装置编码的运动图像进行解码。 编码装置包括:插入许可/拒绝确定单元,其确定解码帧是否是参考帧,并且其瞬时解码刷新帧的帧号是POC周期内的参考帧的数目的正整数倍;以及 恢复点插入单元,其根据插入允许/拒绝判定单元的确定结果将恢复点插入到帧中。 该解码装置包括POC解码单元,其通过执行初始化处理来解码POC,使得当通过随机访问解码开始时,用于解码POC的POC周期内的帧号变为零。