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    Video encoder and method for coding video data frames
    1.
    发明申请
    Video encoder and method for coding video data frames 审中-公开
    视频编码器和视频数据帧编码方法

    公开(公告)号：US20080025388A1

    公开(公告)日：2008-01-31

    申请号：US11881659

    申请日：2007-07-27

    申请人： Bong-Gon Kim ,  Sang-Jo Lee ,  Young-Hun Joo

    发明人： Bong-Gon Kim ,  Sang-Jo Lee ,  Young-Hun Joo

    IPC分类号： H04N11/02

    CPC分类号： H04N19/152 ,  H04N19/114 ,  H04N19/132 ,  H04N19/159 ,  H04N19/172 ,  H04N19/61

    摘要： 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.

    摘要翻译： 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。

    Method for searching for motion vector
    2.
    发明申请
    Method for searching for motion vector 审中-公开
    搜索运动矢量的方法

    公开(公告)号：US20080273597A1

    公开(公告)日：2008-11-06

    申请号：US12075975

    申请日：2008-03-14

    申请人： Petr Kovalenko ,  Kwang-Pyo Choi ,  Han-Sang Kim ,  Bong-Gon Kim ,  Yun-Je Oh ,  Young-Hun Joo

    发明人： Petr Kovalenko ,  Kwang-Pyo Choi ,  Han-Sang Kim ,  Bong-Gon Kim ,  Yun-Je Oh ,  Young-Hun Joo

    IPC分类号： H04N11/02

    CPC分类号： H04N19/533 ,  H04N19/56

    摘要： 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.

    摘要翻译： 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。

    Image encoding apparatus and memory access method
    4.
    发明申请
    Image encoding apparatus and memory access method 审中-公开
    图像编码装置和存储器访问方法

    公开(公告)号：US20080089418A1

    公开(公告)日：2008-04-17

    申请号：US11904088

    申请日：2007-09-26

    申请人： Bong-Gon Kim ,  Chan-Yul Kim ,  Young-Hun Joo

    发明人： Bong-Gon Kim ,  Chan-Yul Kim ,  Young-Hun Joo

    IPC分类号： H04B1/66 ,  G06K9/32 ,  H04N7/12

    CPC分类号： H04N19/523 ,  H04N19/433 ,  H04N19/61

    摘要： 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.

    摘要翻译： 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。

    Digital photographing apparatus and method for detecting and correcting smear by using the same
    7.
    发明申请
    Digital photographing apparatus and method for detecting and correcting smear by using the same 审中-公开
    数字摄影装置及其使用方法

    公开(公告)号：US20080084488A1

    公开(公告)日：2008-04-10

    申请号：US11973510

    申请日：2007-10-09

    申请人： Han-Sang Kim ,  Bong-Gon Kim ,  Chan-Yul Kim ,  Young-Hun Joo

    发明人： Han-Sang Kim ,  Bong-Gon Kim ,  Chan-Yul Kim ,  Young-Hun Joo

    IPC分类号： H04N9/64 ,  H04N5/228 ,  H04N5/335

    CPC分类号： G06T5/005 ,  G06T5/20 ,  G06T2207/10024 ,  H04N5/3595 ,  H04N5/372 ,  H04N9/045 ,  H04N19/86

    摘要： Disclosed is a digital photographing apparatus which includes a lens for optically photographing an object, a CCD for performing photoelectric conversion for an image photographed by the lens, a buffer unit for storing the image converted by the CCD in a unit of frame or field, a controller for determining if a smear has occurred in the image output from the buffer unit, and correcting a pixel value of an image area in which the smear has occurred, an image processor for compressing the image output from the CCD by using a scheme according to characteristics and sizes of a display unit, or restoring the compressed image into an original image under the control of the controller and the display unit for displaying the image output from the image processor on a screen.

    摘要翻译： 公开了一种数字拍摄装置，其包括用于光学拍摄物体的透镜，用于对由镜头拍摄的图像进行光电转换的CCD，用于以帧或场为单位存储由CCD转换的图像的缓冲单元， 控制器，用于确定从缓冲单元输出的图像中是否发生了拖尾，以及校正已经发生拖尾的图像区域的像素值;图像处理器，用于压缩从CCD输出的图像，使用根据 显示单元的特征和尺寸，或者在控制器和显示单元的控制下将压缩图像恢复为原始图像，以在屏幕上显示从图像处理器输出的图像。

    MOTION SEARCH METHOD AND APPARATUS FOR MINIMIZING OFF-CHIP MEMORY ACCESS
    9.
    发明申请
    MOTION SEARCH METHOD AND APPARATUS FOR MINIMIZING OFF-CHIP MEMORY ACCESS 审中-公开
    用于最小化片外存储器访问的运动搜索方法和装置

    公开(公告)号：US20080181310A1

    公开(公告)日：2008-07-31

    申请号：US12018901

    申请日：2008-01-24

    申请人： Kwang-Pyo CHOI ,  Young-Hun Joo ,  Bong-Gon Kim ,  Yun-Je Oh ,  Byeungwoo Jeon ,  Bongsoo Jung

    发明人： Kwang-Pyo CHOI ,  Young-Hun Joo ,  Bong-Gon Kim ,  Yun-Je Oh ,  Byeungwoo Jeon ,  Bongsoo Jung

    IPC分类号： H04N7/26

    CPC分类号： H04N19/57 ,  H04N19/433 ,  H04N19/533 ,  H04N19/557 ,  H04N19/56

    摘要： A motion search method and apparatus for minimizing an off-chip memory access to reduce cycles for predicting a motion vector. A sum of absolute differences (SAD) calculation processing is performed, while an off-chip memory is accessed using Direct Memory Access (DMA). A position of a current macro block is determined if a frame is input and the length of a horizontal search line is set according to adjacent motion vectors and predetermined external parameters. The SADs are calculated by calculating medians of the adjacent motion vectors as a predictive motion vector, setting a vertical direction value of the predictive motion vector as an initial search line, and sequentially searching at least one horizontal search line, and determining a position of a minimum SAD from the at least one horizontal search line. The minimum SAD position is selected as a final motion vector.

    摘要翻译： 一种用于最小化片外存储器访问以减少用于预测运动矢量的循环的运动搜索方法和装置。 执行绝对差（SAD）计算处理的总和，而使用直接存储器访问（DMA）访问片外存储器。 如果帧被输入并且根据相邻运动矢量和预定的外部参数来设置水平搜索线的长度，则确定当前宏块的位置。 通过计算相邻运动矢量的中值作为预测运动矢量来计算SAD，将预测运动矢量的垂直方向值设定为初始搜索线，并依次搜索至少一条水平搜索线，并且确定 来自至少一个水平搜索线的最小SAD。 选择最小SAD位置作为最终运动矢量。