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    • 2. 发明申请
    • Image encoding apparatus and memory access method
    • 图像编码装置和存储器访问方法
    • US20080089418A1
    • 2008-04-17
    • US11904088
    • 2007-09-26
    • Bong-Gon KimChan-Yul KimYoung-Hun Joo
    • Bong-Gon KimChan-Yul KimYoung-Hun Joo
    • H04B1/66G06K9/32H04N7/12
    • H04N19/523H04N19/433H04N19/61
    • Disclosed is an image encoding apparatus and a memory access method. The image encoding apparatus for encoding image data includes: a memory for storing a frame of the image data; a motion prediction unit for detecting a motion vector of a predetermined block unit for a currently-input image frame based on the stored frame, and accessing the memory in order to perform sub-pixel interpolation for a corresponding block of the motion vector; and a motion compensation unit for performing motion compensation with respect to a frame block to be compressed, by using the detected motion vector, thereby reducing the number of times the memory is accessed for encoding. Since the number of memory access times is reduced, which is very frequently used in interpolation of a color difference signal, low-power encoding is achieved.
    • 公开了图像编码装置和存储器访问方法。 用于编码图像数据的图像编码装置包括:存储器,用于存储图像数据的帧; 运动预测单元,用于基于所存储的帧来检测用于当前输入的图像帧的预定块单元的运动矢量,并且访问存储器以便为运动矢量的相应块执行子像素插值; 以及运动补偿单元,用于通过使用检测到的运动矢量来执行关于要压缩的帧块的运动补偿,由此减少存储器被访问以进行编码的次数。 由于在色差信号的插值中经常使用的存储器访问次数减少,因此实现了低功率编码。
    • 3. 发明申请
    • Method for searching for motion vector
    • 搜索运动矢量的方法
    • US20080273597A1
    • 2008-11-06
    • US12075975
    • 2008-03-14
    • Petr KovalenkoKwang-Pyo ChoiHan-Sang KimBong-Gon KimYun-Je OhYoung-Hun Joo
    • Petr KovalenkoKwang-Pyo ChoiHan-Sang KimBong-Gon KimYun-Je OhYoung-Hun Joo
    • H04N11/02
    • H04N19/533H04N19/56
    • Disclosed is video encoding technology, and more particularly a method for searching for a motion vector in a procedure of estimating a motion in video frames. The motion vector search method includes the steps of: individually calculating error energies of a center point and vertices of a search pattern in a search window used in a previous frame with respect to a center of the search window established in the current frame, thereby designating a motion vector candidate point; either determining the motion vector candidate point as a moving point of a motion vector, or calculating error energies of a pair of neighboring points and re-establishing a motion vector candidate point; and either determining the re-established motion vector candidate point as a moving point of a motion vector, or re-establishing a search pattern, re-checking the error energies of the center point, the vertices and the neighboring points, and determining a moving point of a motion vector.
    • 公开了视频编码技术,更具体地,涉及在估计视频帧中的运动的过程中搜索运动矢量的方法。 运动矢量搜索方法包括以下步骤:相对于在当前帧中建立的搜索窗口的中心,分别计算在先前帧中使用的搜索窗口中的中心点和搜索模式的顶点的误差能量,从而指定 运动矢量候选点; 将运动矢量候选点确定为运动矢量的移动点,或者计算一对相邻点的误差能量并重新建立运动矢量候选点; 并且确定重新建立的运动矢量候选点作为运动矢量的移动点,或者重新建立搜索模式,重新检查中心点,顶点和相邻点的误差能量,以及确定移动 运动矢量点。
    • 6. 发明申请
    • Video encoder and method for coding video data frames
    • 视频编码器和视频数据帧编码方法
    • US20080025388A1
    • 2008-01-31
    • US11881659
    • 2007-07-27
    • Bong-Gon KimSang-Jo LeeYoung-Hun Joo
    • Bong-Gon KimSang-Jo LeeYoung-Hun Joo
    • H04N11/02
    • H04N19/152H04N19/114H04N19/132H04N19/159H04N19/172H04N19/61
    • Disclosed is a video encoder and a method for coding a video data frame. The encoder of a video encoder checks overall capacity of video data frames to be encoded, and predicts the number of the P frames which are to be subsequently encoded according to the checked overall capacity by using mean capacity of P frames extracted from a previous GOP. The number of frames that will be skipped due to an overflow of a buffer is computed from the predicted number of the P frames according to available capacity of the buffer. The position of those frames that will be skipped is set not to be continuous according to the predicted number of the P frames and to the number of frames of the GOP. Furthermore, while coding of the video data frames is being performed, a video data frame chosen to be currently encoded is arranged in the same position as a frame to be skipped is arranged, coding of the video data frame is skipped. Herein, the skipped frames are determined, from among the video data frames, from 1 frames which become reference frames of other video data frames, or from P frames, except a first P frame, which becomes a reference frame of another video data frame. Accordingly, while essential reference frames (i.e., I and P frames) are being prevented from being skipped, consecutive frame skips are also prevented from occurring, and therefore the overall quality of pictures can be prevented from being degraded.
    • 公开了一种用于编码视频数据帧的视频编码器和方法。 视频编码器的编码器检查要编码的视频数据帧的总容量,并且通过使用从先前GOP提取的P帧的平均容量,根据检查的总容量来预测随后将被编码的P帧的数量。 根据缓冲器的可用容量,从P帧的预测数量计算由于缓冲器溢出而将被跳过的帧的数量。 根据预测的P帧数和GOP的帧数,将被跳过的帧的位置设置为不连续。 此外,在执行视频数据帧的编码的同时,选择当前编码的视频数据帧被布置在与要跳过的帧相同的位置,跳过视频数据帧的编码。 这里,从视频数据帧中,从成为其他视频数据帧的参考帧的1帧或从成为另一视频数据帧的参考帧的第一P帧除外的P帧确定跳过的帧。 因此,虽然防止了基本参考帧(即I和P帧)被跳过,但是也防止了连续的帧跳过,从而可以防止图像的整体质量下降。