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    • 2. 发明授权
    • Velocity error correcting circuit for time base error corrector
    • 时差误差校正器速度误差校正电路
    • US4802026A
    • 1989-01-31
    • US96451
    • 1986-08-14
    • Shinji KanekoKenji TakanashiYoshiaki Wakisaka
    • Shinji KanekoKenji TakanashiYoshiaki Wakisaka
    • H04N9/896H04N5/78
    • H04N9/896
    • A main memory stores a signal reproduced from a recording medium with a time base error, and a read clock generator and phase modulator generates a read clock signal of variable phase for reading out the signal from the main memory. A velocity compensating circuit generates first discrete signals representative of the velocity error of the reproduced signal at designated sample points of a current field and second discrete signals representative of a velocity error of the reproduced signal at sample points of a previous field respectively corresponding to the designated points and interleaves the first and second discrete signals to produce a combined signal having a sampling frequency greater than that of either the first or second discrete signals. The combined signal constitutes a nonlinear approximation of the time base error, and the read clock generator and phase modulator is responsive to the combined signal for controlling the readout of the reproduced signal from the main memory in such a manner as substantially to eliminate the time base error.
    • 主存储器存储从具有时基误差的记录介质再现的信号,并且读时钟发生器和相位调制器产生可变相位的读时钟信号,以从主存储器读出信号。 速度补偿电路产生表示当前场的指定采样点处的再现信号的速度误差的第一离散信号,以及表示分别对应于指定的先前场的采样点处的再现信号的速度误差的第二离散信号 点和交织第一和第二离散信号以产生具有大于第一或第二离散信号的采样频率的采样频率的组合信号。 组合信号构成时基误差的非线性近似,并且读时钟发生器和相位调制器响应于组合信号,用于以基本上消除时基的方式控制来自主存储器的再现信号的读出 错误。
    • 9. 发明授权
    • Apparatus for detecting television image movement
    • 用于检测电视图像移动的装置
    • US4779131A
    • 1988-10-18
    • US889224
    • 1986-07-25
    • Kunio MatsumotoTadao FujitaKenji TakanashiYutaka TanakaToshiro OhmuraTaiichiro KuritaYoshimichi OhtsukaTaiji NishizawaYuichi Ninomiya
    • Kunio MatsumotoTadao FujitaKenji TakanashiYutaka TanakaToshiro OhmuraTaiichiro KuritaYoshimichi OhtsukaTaiji NishizawaYuichi Ninomiya
    • G06T7/20H04N5/14H04N7/18
    • H04N5/144G06T7/2053
    • In an apparatus for detecting movement of a television image in response to frame difference data corresponding to a difference between present frame data and previous frame data, a video signal is divided into a plurality of segmental areas for each frame, a pixel or picture element is selected to represent each of the segmental areas, frame difference data are produced for each of the segmental areas by calculating differences in the position or coordinates of a pixel representative of a segmental area of a previous frame from the respective picture element of the corresponding segmental area in the present frame, and each of the calculated differences smaller than a predetermined magnitude, and which would be characteristic of a stationary background portion of the television image, is omitted from the frame difference data. This is effective to improve the movement vector detection accuracy. The apparatus has a circuit for zeroing the frame difference data, and thereby improving, the movement vector detection reliability when the number of the calculated differences omitted from the frame difference data exceeds a predetermined value.
    • 在用于根据与当前帧数据和先前帧数据之间的差对应的帧差数据来检测电视图像的移动的装置中,视频信号被划分成每个帧的多个分段区域,像素或像素是 被选择为表示每个分段区域,通过计算代表先前帧的分段区域的像素的位置或坐标的差异,从而对于每个分段区域产生帧差数据,该像素与相应分段区域的相应像素 在帧差中,从帧差数据中省略计算出的差异小于规定大小,并且将是电视图像的静止背景部分的特征的各个。 这对于提高运动矢量检测精度是有效的。 该装置具有用于使帧差分数据归零的电路,从而提高当从帧差数据中省略的计算出的差异的数量超过预定值时的运动矢量检测可靠性。