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1. 发明授权

US5270815A Image compression processing apparatus having means for removing jitter contained at boundary between image and mask portions 失效
标题翻译：图像压缩处理设备具有用于去除包含在图像和掩模部分之间边界处的抖动的装置
公开(公告)号：US5270815A
公开(公告)日：1993-12-14
申请号：US791225
申请日：1991-11-13
申请人： Naoji Okumura , Hirohiko Sakashita
发明人： Naoji Okumura , Hirohiko Sakashita
IPC分类号： H04N5/262 , H04N7/01
CPC分类号： H04N7/0122
摘要： Input analog image signals are converted to digital image signals and applied to a demodulation circuit and a synchronous circuit. In the demodulation circuit, the digital image signals are demodulated and then compressed by a compression circuit. In the synchronous circuit, the digital image signals are synchronously processed so as to output horizontal pulses in accordance with a horizontal synchronizing signal contained in the digital image signals and so as to output phase difference information denoting a timing difference between the output of a horizontal pulse and an interpolated crossing of the horizontal synchronizing signal across a synchronizing threshold. A boundary at an image portion and a mask portion of an output image signal is corrected so that the boundary is substantially free of jitter using the horizontal pulses and the phase difference information output by the synchronous circuit. In this manner, a smooth boundary is obtained at the image portion and mask portion of the final compressed image.

2. 发明授权

US5231477A Comb filter 失效
标题翻译： COMB过滤器
公开(公告)号：US5231477A
公开(公告)日：1993-07-27
申请号：US700855
申请日：1991-05-16
申请人： Naoji Okumura , Hirohiko Sakashita
发明人： Naoji Okumura , Hirohiko Sakashita
IPC分类号： H03H15/00 , H04N9/78
CPC分类号： H04N9/78
摘要： A comb filter serves to process an input digital video signal which is derived from an analog video signal by a analog-to-digital conversion including a sampling process responsive to a system clock signal. The comb filter includes a separating device for separating the input video signal into a plurality of video signals which are offset with each other in timing and which have a clock rate equal to 1/N times a clock rate of the system clock signal where N denotes a predetermined natural number greater than 1. A first delaying device serves to delay a first output signal of the separating device. A chroma signal processor separates a first chroma signal in response to the first output signal of the separating device and an output signal of the first delaying device. A first subtracter serves to subtract the first chroma signal from the output signal of the first delaying device. A second delaying device serves to delay a second output signal of the separating device. An interpolating device serves to interpolate the first chroma signal into a second chroma signal to compensate for a difference in timing between the output signal of the second delaying device and the first chroma signal. A second subtracter serves to subtract the second chroma signal from the output signal of the second delaying device. A combining device serves to combine an output signal of the first subtracter and an output signal of the second subtracter into a luminance signal.

3. 发明授权

US5388168A Picture quality improving circuit using a cumulative histogram 失效
标题翻译：使用累积直方图的图像质量改进电路
公开(公告)号：US5388168A
公开(公告)日：1995-02-07
申请号：US84064
申请日：1993-06-30
申请人： Hirohiko Sakashita , Naoji Okumura
发明人： Hirohiko Sakashita , Naoji Okumura
IPC分类号： G06T5/40 , H04N5/20
CPC分类号： G06T5/40 , G06T5/009 , H04N5/20 , G06T2207/10016
摘要： A picture quality improving circuit for automatically obtaining a corrected image by capturing features of the input video signals. The circuit first compares an input luminance signal with a plurality of reference values, measures the results of the comparison by a plurality of counters and obtains a cumulative histogram within a predetermined period of time. Next, the cumulative histogram signals are stored in a latch circuit for a predetermined period of time, and an interpolation circuit determines and outputs a correction signal corresponding to the input luminance signal by interpolating the cumulative histogram. Accordingly, when a large number of dark signals exist in the input luminance signal, the cumulative histogram signals will describe an upwardly projecting graph, and the dark portions of the signal will be extended in a bright direction. Thereby, the picture quality can be improved.
摘要翻译：一种用于通过捕获输入视频信号的特征来自动获得校正图像的图像质量改善电路。电路首先将输入亮度信号与多个参考值进行比较，通过多个计数器测量比较结果，并在预定时间段内获得累积直方图。接下来，将积累的直方图信号存储在锁存电路中预定的时间段，并且内插电路通过内插累积直方图来确定并输出与输入的亮度信号相对应的校正信号。因此，当输入亮度信号中存在大量暗信号时，累积直方图信号将描述向上投影的图形，并且信号的暗部将在明亮方向上延伸。从而可以提高图像质量。

4. 发明授权

US5192996A Video chroma signal processing circuit 失效
标题翻译：视频色度信号处理电路
公开(公告)号：US5192996A
公开(公告)日：1993-03-09
申请号：US788240
申请日：1991-11-05
申请人： Hirohiko Sakashita , Tetsuo Kutsuki , Naoji Okumura
发明人： Hirohiko Sakashita , Tetsuo Kutsuki , Naoji Okumura
IPC分类号： H04N5/14 , H04N9/68 , H04N9/77 , H04N11/04
CPC分类号： H04N9/77
摘要： A video chroma signal processing circuit in which a composite video signal, formed of an analog luminance signal and an analog chrominance signal, is separated into Y and C components and converted into digital codes by AD converters and processed by processing circuits. The outputs of the processing circuits are converted into analog signals again with DA converters to produce a picture image; wherein, it is intended to obtain a wide band of a luminance signal by making efficient use of an AD converter for a chrominance signal and to improve horizontal resolution. The apparent sampling frequency is doubled by sampling the AD converter for a chrominance signal with a phase reverse to that of an AD converter for a luminance signal so as to improve the horizontal resolution of the luminance signal.
摘要翻译：一种视频色度信号处理电路，其中由模拟亮度信号和模拟色度信号形成的复合视频信号被分离成Y和C分量，并由AD转换器转换成数字码并由处理电路进行处理。处理电路的输出再次用DA转换器转换为模拟信号以产生图像; 其目的在于通过有效地利用AD转换器获得色度信号的宽带，提高水平分辨率。通过对与用于亮度信号的AD转换器的相位相反的色度信号的AD转换器采样AD视频采样频率，以提高亮度信号的水平分辨率。

5. 发明授权

US5138455A Video signal processing circuit for compressed picture insertion function of television receiver 失效
标题翻译：视频信号处理电路，用于电视接收机的压缩图像插入功能
公开(公告)号：US5138455A
公开(公告)日：1992-08-11
申请号：US705040
申请日：1991-05-28
申请人： Naoji Okumura , Hirohiko Sakashita
发明人： Naoji Okumura , Hirohiko Sakashita
IPC分类号： H04N5/265 , H04N5/45
CPC分类号： H04N5/45
摘要： A video signal processing circuit for providing a compressed picture insertion function in a television receiver, whereby a compressed-size picture expressed by one video signal is displayed as an insert within a full-size picture that is expressed by another video signal, by demodulating and combining the video signals, which can be of respectively different television standards, such as the PAL and MUSE standards. The circuit utilizes only one demodulator circuit for one video signal and two demodulator circuits for the other signal. When one of the video signals is in accordance with a broadcast standard such as the MUSE standard, which requires a large-scale demodulator circuit, a significant reduction in overall circuit scale is achieved by comparsion with the prior art, in which two demodulator circuits are required for each of the video signals.
摘要翻译：一种用于在电视接收机中提供压缩图像插入功能的视频信号处理电路，由此将由一个视频信号表示的压缩大小的图像作为插入显示在由另一视频信号表示的全尺寸图像内，通过解调和组合视频信号，其可以分别是不同的电视标准，例如PAL和MUSE标准。该电路仅使用一个解调器电路用于一个视频信号，另外两个解调器电路用于另一个信号。当其中一个视频信号符合诸如需要大规模解调器电路的MUSE标准的广播标准时，通过与现有技术的比较来实现总体电路规模的显着降低，其中两个解调器电路是每个视频信号都需要。

6. 发明授权

US6018608A Method of generating information used for the copy protecting signal and apparatus using the same 失效
标题翻译：生成用于复制保护信号的信息的方法和使用其的装置
公开(公告)号：US6018608A
公开(公告)日：2000-01-25
申请号：US761532
申请日：1996-12-06
申请人： Hirohiko Sakashita , Hisao Morita , Masaaki Fujita , Kenji Ishikawa
发明人： Hirohiko Sakashita , Hisao Morita , Masaaki Fujita , Kenji Ishikawa
IPC分类号： H04N5/913 , H04N5/76
CPC分类号： H04N5/913 , H04N2005/91371
摘要： A component of color difference signal is detected from a video component signal, and its color saturation information is compared with a predetermined threshold level, then in response to the comparison result, information is generated in order to control phase modulation such as, when the information is smaller than the threshold level, phases of color burst signals are modulated during a specified period, and when the information is larger than the threshold level, the phase stays as standard. The generated information is added to the color video signal. These steps can avoid unpleasant striped color noises appeared on a conventional color TV receiver, the unpleasant striped color noises has been caused by a modified color burst signal without the above steps.
摘要翻译：从视频分量信号检测色差信号的分量，并将其色饱和度信息与预定阈值电平进行比较，然后根据比较结果生成信息，以便控制相位调制，例如当信息小于阈值电平时，在指定时段内对色同步信号的相位进行调制，当信息大于阈值电平时，相位保持标准。生成的信息被添加到彩色视频信号。这些步骤可以避免常规彩色电视接收机上出现令人不愉快的条纹色噪音，而不用上述步骤，由修改的色同步信号引起令人不愉快的条纹色噪声。

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