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    • 2. 发明授权
    • Video encoding using adaptive filters and variable threshold
    • 使用自适应滤波器和变量阈值的视频编码
    • US5097322A
    • 1992-03-17
    • US570232
    • 1990-08-20
    • Jon A. Fairhurst
    • Jon A. Fairhurst
    • H04N9/64
    • H04N9/646
    • An improved apparatus is provided for minimizing cross-color artifacts in the encoding and decoding of quadrature modulated color television signals during the encoding process, so that when the encoded video signals are decoded,s uch artifacts are minimized while a maximum amount of picture detail is preserved. A luminance signal is applied to both a delay element and an adaptive filter. The output of the delay element, a delayed luminance signal, is applied to a subtractor circuit. The output of the adaptive filter, an adaptive compensation signal, is applied to a variable limiter. Within the variable limiter, the adaptive compensation signal is applied to a rectifier/intergrator and a limiter circuit. The output of the rectifier/integrator, a cross-color activity signal, is sent to a scaler/combiner circuit top which is also optionally applied a chrominance activity signal. The scaler/combiner circuit weights these inputs with different factors before summing them. The output of the scaler/combiner circuit is a limiter control signal that is used to control how much of the adaptive compensation signal is applied to the subtractor circuit where it is substracted from the delayed luminance signal to produce a compensated luminance signal. A corresponding method is disclosed.
    • 提供了一种改进的装置,用于在编码处理期间最小化正交调制彩色电视信号的编码和解码中的交叉色彩伪影,使得当编码的视频信号被解码时,这些伪像被最小化,而最大量的图像细节是 保存 亮度信号被施加到延迟元件和自适应滤波器两者。 延迟元件的输出(延迟亮度信号)被施加到减法器电路。 自适应滤波器的输出(自适应补偿信号)被应用于可变限幅器。 在可变限制器内,自适应补偿信号被施加到整流器/积分器和限幅器电路。 整流器/积分器的输出 - 交叉色活动信号被发送到缩放器/组合器电路顶部,其也可选地应用色度活动信号。 缩放器/组合器电路在将这些输入与不同因素相加之前对它们进行加权。 缩放器/组合器电路的输出是限制器控制信号,其用于控制​​将多少自适应补偿信号施加到减法器电路,其中它被从延迟的亮度信号中减去以产生经补偿的亮度信号。 公开了相应的方法。
    • 4. 发明授权
    • Crosspoint matrix
    • 交叉点矩阵
    • US5355370A
    • 1994-10-11
    • US909108
    • 1992-07-02
    • Jon A. FairhurstJay S. Baker
    • Jon A. FairhurstJay S. Baker
    • H04N5/268H04Q11/04
    • H04N5/268
    • A crosspoint matrix with integrated matte generators includes double buffered internal storage registers which may be serially loaded with mode and selection data to enable the crosspoint matrix to operate in a crosspoint mode wherein a selected input bus is directed to selected output bus. Further, the crosspoint matrix may be operated in a matte generator mode wherein the stored data is supplied to the output bus as a matte signal. The matte signal may be selectively toggled through a series of values to enable operation with both D1 and D2 signals. The data is latched in response to a vertical pulse which enables data values to be written in non-real time as a background task while the actual switch of data is accomplished only upon receipt of a vertical pulse.
    • 具有集成消光发生器的交叉点矩阵包括双缓冲内部存储寄存器,其可以串行地加载模式和选择数据,以使得交叉点矩阵能够以交叉点模式工作,其中所选择的输入总线被引导到选择的输出总线。 此外,交叉点矩阵可以以无光发生器模式操作,其中将存储的数据作为无光信号提供给输出总线。 无光泽信号可以选择性地切换一系列值以使D1和D2信号同时进行操作。 数据被锁存以响应垂直脉冲,使得数据值可以非实时写入作为后台任务,而数据的实际切换仅在接收到垂直脉冲时才完成。
    • 6. 发明授权
    • Variable chrominance filtering for encoding television signals
    • 用于编辑电视信号的可变色彩滤波
    • US5150203A
    • 1992-09-22
    • US633821
    • 1990-12-26
    • Jon A. Fairhurst
    • Jon A. Fairhurst
    • H04N9/64H04N9/68
    • H04N9/646
    • A chrominance filtering system reduces chrominance detail when sufficient luminance detail is present, but limits how much chrominance detail is reduced when insufficient luminance detail is present. The chrominance input signal is applied to a high pass filter and a suitable delay circuit. The output of the high pass filter, C.sub.hp, is a signal indicative of chrominance detail. It is applied to the input of a bipolar clipping circuit that also receives a control signal, .vertline.Y.sub.hp '.vertline..sub.clipped indicative of luminance detail. The control signal is derived by high pass filtering, rectifying and low pass filtering the luminance signal to produce a signal, .vertline.Y.sub.hp .vertline., that is absolute value of high pass filtered luminance activity. This signal is then scaled by multiplication by a first constant and then offset by addition to a second constant to produce .vertline.Y.sub.hp '.vertline.. .vertline.Y.sub.hp '.vertline. is then clipped to be between a minimum and a maximum value to produce the control signal .vertline.Y.sub.hp '.vertline..sub.clipped. The bipolar clipping circuit constrains C.sub.hp to produce C.sub.hpc according to the following relationships: If C.sub.hp is > or =0, then C.sub.hpc is > or = to .vertline.Y.sub.hp '.vertline..sub.clipped ; or if C.sub.hp is
    • 当存在足够的亮度细节时,色度滤波系统降低了色度细节,但是当不足够的亮度细节存在时,限制了色度细节减少了多少。 色度输入信号被施加到高通滤波器和合适的延迟电路。 高通滤波器Chp的输出是表示色度细节的信号。 它被应用于双极限幅电路的输入端,该双极截止电路也接收指示亮度细节的控制信号| Yhp'。 通过高通滤波,整流和低通滤波亮度信号来产生控制信号,以产生高通滤波亮度活动的绝对值的信号| Yhp |。 然后通过乘以第一常数来缩放该信号,然后通过加上第二常数来偏移以产生| Yhp'。 然后将| Yhp'被限制在最小值和最大值之间,以产生剪切的控制信号| Yhp'。 双极限幅电路根据以下关系约束Chp产生Chpc:如果Chp为>或= 0,则Chpc =>或= to | Yhp'|clipped; 或者如果Chp <0,则Chpc为<或= to -|Yhp'|clipped。 第一和第二常数以及最小值和最大值都经过优化。
    • 7. 发明授权
    • Real-time video production using recursive techniques
    • 使用递归技术实时视频制作
    • US5986717A
    • 1999-11-16
    • US883991
    • 1997-06-27
    • Jon A. Fairhurst
    • Jon A. Fairhurst
    • H04N5/262H04N5/272H04N9/74
    • H04N5/272H04N5/262
    • A real-time video production technique using recursive techniques adds an output framestore, a feedback storage unit and a synchronized controller to a pipelined video processing system. Partial composites are stored in the feedback storage unit while complete composites are stored in the output framestore. The output framestore provides a preview video during the video processing. For automatic assembly where the feedback storage unit has a length of many frames the complete composites are stored also in the feedback storage unit and a multiplexer is used to select the complete composites either from the output framestore for each new complete composite or from the feedback storage unit otherwise.
    • 使用递归技术的实时视频制作技术将输出帧存储,反馈存储单元和同步控制器添加到流水线视频处理系统。 部分复合材料存储在反馈存储单元中,而完整的复合材料存储在输出框架中。 输出帧存储在视频处理期间提供预览视频。 对于自动装配,其中反馈存储单元具有多个帧的长度,完整的复合物也存储在反馈存储单元中,并且多路复用器用于从每个新的完整复合体的输出帧存储或从反馈存储器中选择完整的复合物 单位否则。
    • 8. 发明授权
    • Adaptive control signal generator for an adaptive luminance/chrominance
separator
    • 用于自适应光源/色度分离器的自适应控制信号发生器
    • US5231478A
    • 1993-07-27
    • US813537
    • 1991-12-26
    • Jon A. Fairhurst
    • Jon A. Fairhurst
    • H04N9/64H04N9/78
    • H04N9/78
    • An apparatus and method for producing improved adaptive control signals for a luminance and chrominance separation circuit employing adaptive filtering of a chrominance signal includes a vertical difference detector, a horizontal difference detector, and a combiner. The vertical difference detector contains upper difference detector and lower difference detector, each of which receives a horizontally filtered next line signal (L.sub.N), a horizontally filtered present line signal (L.sub.P), and a horizontally filtered last line signal (L.sub.L), and which produce, respectively, an upper difference signal and a lower difference signal. In a preferred embodiment, the lower and upper difference detectors implement, respectively, the expressions .vertline.2L.sub.L +L.sub.P -L.sub.N .vertline. and .vertline.2L.sub.N +L.sub.P -L.sub.L .vertline.. The vertical detector also contains a larger valve selector that receives the upper and lower difference signals and produces a vertical chrominance difference signal that is based on, and preferably is the larger of the upper and lower difference signals. The horizontal difference detector receives the present line signal and determines the absolute value of the sum of the values of two pixels that are separated by an integral number of half cycles of a subcarrier frequency to produce a horizontal chrominance difference signal. The combiner contains a subtracter for subtracting the horizontal chrominance difference signal from the vertical chrominance difference signal to produce an adaptive control signal, and may further include a scaler on the subtracter input and a divide-by-two circuit and/or a limiter on the subtracter output.
    • 9. 发明授权
    • Computer system with efficient memory usage for managing multiple application programs
    • 具有高效内存使用的计算机系统,用于管理多个应用程序
    • US06256714B1
    • 2001-07-03
    • US09270932
    • 1999-03-16
    • Jeffrey B. SampsellJon A. FairhurstEugene P. Martinez, Jr.Larry Alan Westerman
    • Jeffrey B. SampsellJon A. FairhurstEugene P. Martinez, Jr.Larry Alan Westerman
    • G06F1200
    • G06F9/44557
    • A first device includes a processor, a first memory, and a memory manager. A second device includes a second memory and a first application program, and a third device includes a third memory and a second application program. The first application program is loaded into the first memory to be executed by the processor. Application program variables related to the first application are stored in the first memory. The second application program to be executed by the processor is loaded into the memory in at least a partially overlapping manner of the first application program. The creation of second application program variables related to the second application program in the first memory is in a region not occupied by the first application program. Alternatively, the first and second application programs may be in the same device and/or memory.
    • 第一设备包括处理器,第一存储器和存储器管理器。 第二设备包括第二存储器和第一应用程序,并且第三设备包括第三存储器和第二应用程序。 第一应用程序被加载到第一存储器中以由处理器执行。 与第一个应用程序相关的应用程序变量存储在第一个存储器中。 要由处理器执行的第二应用程序以第一应用程序的至少部分重叠的方式被加载到存储器中。 在第一存储器中与第二应用程序相关的第二应用程序变量的创建在第一应用程序未占用的区域中。 或者,第一和第二应用程序可以在相同的设备和/或存储器中。
    • 10. 发明授权
    • Pattern generation using wipe solid generator
    • 使用擦拭固体发生器的图案生成
    • US5283652A
    • 1994-02-01
    • US968658
    • 1992-10-30
    • Jon A. Fairhurst
    • Jon A. Fairhurst
    • H04N1/387H04N5/262
    • H04N5/2622
    • A method of pattern generation for a screen using a wipe solid generator and a recursive memory includes generating from operator inputs a wipe solid. An extent of the generated wipe solid is measured to produce maximum and minimum values. These maximum and minimum values are extended to encompass a desired border size and softness. A lever-arm scaling function is selected based upon whether a change in operator input causes a reversal in pattern and/or causes the pattern to "breathe." The selected lever-arm scaling function uses prior values from the recursive memory to generate new values that are stored in the recursive memory. From the stored values clip levels are determined such that completion of lever-arm movement to a limit position coincides with completion of the pattern without distortion of the size of the pattern.
    • 使用擦拭固体发生器和递归存储器的屏幕的图案生成方法包括从操作者输入产生擦拭固体。 测量产生的擦拭固体的程度以产生最大值和最小值。 这些最大值和最小值被扩展到包含期望的边界大小和柔软度。 基于操作者输入的变化是否导致模式反转和/或使模式“呼吸”来选择杠杆臂缩放功能。 所选的杠杆臂缩放功能使用递归内存中的先前值来生成存储在递归内存中的新值。 从存储的值剪辑级别被确定为使得到极限位置的杠杆臂移动的完成与图案的完成一致,而不会使图案的尺寸失真。