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1. 发明授权

US06710818B1 ILLUMINATION FLICKER DETECTION APPARATUS, AN ILLUMINATION FLICKER COMPENSATION APPARATUS, AND AN AC LINE FREQUENCY DETECTION APPARATUS, METHODS OF DETECTING ILLUMINATION FLICKER, COMPENSATING ILLUMINATION FLICKER, AND MEASURING AC LINE FREQUENCY 失效
标题翻译：照明闪光灯检测装置，照明闪光灯补偿装置和交流线路频率检测装置，检测照明闪光灯的方法，补偿照明闪光灯和测量交流线频率
公开(公告)号：US06710818B1
公开(公告)日：2004-03-23
申请号：US09680216
申请日：2000-10-06
申请人： Misa Kasahara , Kenji Tabei , Makoto Sube
发明人： Misa Kasahara , Kenji Tabei , Makoto Sube
IPC分类号： H04N521
CPC分类号： H04N5/2357 , H04N5/235
摘要： A video signal including illumination flicker component is integrated at each of unit areas (horizontal lines) in a frame (field) of the video signal. The integrated level at each of the unit areas at the frame and the integrated level at the corresponding unit area of an adjacent frame are averaged. Dividing is effected between results of the averaging and integrating every unit area. It is judged whether flicker exists in the video signal by frequency-analyzing results of the dividing result at the unit areas. The unit area may be plural adjacent lines where flickering are negligible. The averaging circuit may be circulation type of or FIR filter. Threshold level for judging the flicker is changed according to a shutter speed control signal. Flicker compensation may be executed by controlling shutter speed or the AGC according to flicker judging result. A still condition at a block in a frame may be detected from the integration result at plural frames. When the block is judged to be still, the flicker is judged. An ac line frequency detection is also disclosed to detect the frequency of the ac line from a video signal generated under illumination including flicker. An imaging circuit may be provided to generate the video signal therein.
摘要翻译：包括照明闪烁分量的视频信号被集成在视频信号的帧（场）中的每个单位区域（水平行）处。在帧的每个单位区域和相邻帧的相应单位区域处的积分水平的积分水平被平均。在每个单位面积的平均和积分结果之间进行分割。通过频率分析在单位区域的分割结果的结果来判断视频信号中是否存在闪烁。单位面积可以是多个相邻的线，其中闪烁是可忽略的。平均电路可以是循环型或FIR滤波器。用于判断闪烁的阈值水平根据快门速度控制信号而改变。可以通过根据闪烁判断结果控制快门速度或AGC来执行闪烁补偿。可以从多个帧的积分结果检测帧中的块处的静止条件。当判断为静止时，判断闪烁。还公开了一种交流线路频率检测，以从包括闪烁在内的照明下产生的视频信号检测交流线路的频率。可以提供成像电路以在其中产生视频信号。

2. 发明授权

US06687300B1 Motion detection circuit and a noise suppressing circuit including the same 失效
标题翻译：运动检测电路和包括该运动检测电路的噪声抑制电路
公开(公告)号：US06687300B1
公开(公告)日：2004-02-03
申请号：US09394685
申请日：1999-09-13
申请人： Yukio Fujita , Noriyoshi Kato , Misa Kasahara
发明人： Yukio Fujita , Noriyoshi Kato , Misa Kasahara
IPC分类号： H04N712
CPC分类号： G06T7/246
摘要： In a motion detection circuit, a difference signal between the video and one-frame delayed video signals is generated Edge signals are generated from the video and delayed video signals. Motion in a target pixel is judged from the interframe difference signal according to the edge signals. A motion judging circuit further includes an LPF and a selector for supplying an output of the LPF or the difference signal. The motion judging circuit includes a polarity deviation detecting circuit for judging the motion as moving in the presence of agreement of the polarities of all pixels at any of peripheral areas around the target pixel. The size of the peripheral areas are controlled. The motion judging circuit may further includes a peripheral pixel comparing circuit (may be bypassed) for detecting motion at the pixel by checking polarities of the difference signal at an area around the target pixel and a majority detection circuit (may be bypassed) for detecting a majority of the results of the polarity deviation detection circuit to judge the motion with deviation to a side of stopping. The polarity deviation circuit may compensate the result of the peripheral pixel comparing circuit. Width of the edge signals are controlled. A noise suppression apparatus including a motion detection circuit mentioned above is also disclosed.
摘要翻译：在运动检测电路中，产生视频和一帧延迟的视频信号之间的差分信号。从视频和延迟视频信号产生边沿信号。根据边缘信号从帧间差分信号判断目标像素中的运动。运动判定电路还包括LPF和用于提供LPF的输出或差分信号的选择器。运动判断电路包括：极性偏移检测电路，用于在存在目标像素周围的任何周边区域的所有像素的极性一致的情况下，将运动判断为移动。外围区域的大小被控制。运动判断电路还可以包括周边像素比较电路（可以被旁路），用于通过检查在目标像素周围的区域处的差分信号的极性和多数检测电路（可以旁路）来检测像素的运动，以检测运动大多数极性偏差检测电路的结果判断运动偏离一侧停止。极性偏差电路可补偿周边像素比较电路的结果。边缘信号的宽度被控制。还公开了包括上述运动检测电路的噪声抑制装置。

3. 发明授权

US06459734B1 Motion detection circuit and a noise suppression circuit including the same 失效
标题翻译：运动检测电路和包括其的噪声抑制电路
公开(公告)号：US06459734B1
公开(公告)日：2002-10-01
申请号：US09562476
申请日：2000-05-01
申请人： Noriyoshi Kato , Keiji Toyoda , Yukio Fujita , Toshiyuki Sano , Misa Kasahara
发明人： Noriyoshi Kato , Keiji Toyoda , Yukio Fujita , Toshiyuki Sano , Misa Kasahara
IPC分类号： H04N736
CPC分类号： H04N5/21 , G06T7/254 , H04N5/145
摘要： An interframe difference signal is generated from the video signal and its one-frame delayed video signal. A filter removes a carrier color signal from the interframe difference signal to output the interframe difference luminance signal. A first motion judging circuit judges a motion in the video signal at a target pixel from the interframe difference luminance signal to output a first motion judging result in accordance with a first edge detection signal. A second motion judging circuit judges a motion in the video signal at the target pixel from a luminance signal and the carrier signal in the interframe difference signal to output a second motion judging result in accordance with a second edge detection circuit. The first and second motion judging results are combined. A majority determining circuit determines majority of the combined result from adjacent Q pixels in accordance with a third edge detection signal. A circular signal generation circuit generates a coefficient K according to the result of the majority determining circuit. The interframe difference signal is multiplied with k to generate a circulation signal. A subtractor subtracts the circulation signal from the video signal to generate an output video signal of which noise is suppressed.
摘要翻译：从视频信号及其一帧延迟的视频信号产生帧间差分信号。滤波器从帧间差分信号中去除载波颜色信号，以输出帧间差分亮度信号。第一运动判断电路根据帧间差分亮度信号判断目标像素中的视频信号中的运动，以根据第一边缘检测信号输出第一运动判断结果。第二移动判断电路根据第二边缘检测电路从亮度信号和帧间差分信号中的载波信号判断目标像素中的视频信号中的运动，以输出第二运动判断结果。第一和第二运动判断结果相结合。多数确定电路根据第三边缘检测信号确定来自相邻Q像素的组合结果的大部分。圆形信号生成电路根据多数判定电路的结果生成系数K. 将帧间差分信号乘以k以产生循环信号。减法器从视频信号中减去循环信号，以产生抑制噪声的输出视频信号。

4. 发明授权

US5432563A Image contour enhancing apparatus which limits enhancement where signal components for contour enhancement in both horizontal and vertical directions are generated in overlapping relationship 失效
标题翻译：图像轮廓增强装置限制增强，其中在水平和垂直方向上的轮廓增强的信号分量以重叠的关系产生
公开(公告)号：US5432563A
公开(公告)日：1995-07-11
申请号：US265773
申请日：1994-06-27
申请人： Misa Kasahara
发明人： Misa Kasahara
IPC分类号： H04N5/208
CPC分类号： H04N5/208
摘要： An image contour enhancing apparatus capable of minimizing excessive enhancement of the image contour in an image area where both a horizontal contour enhancing signal and a vertical contour enhancing signal are generated in overlapping relation. In the image contour enhancing apparatus, an image contour enhancing signal produced by deriving a horizontal contour enhancing signal from a video input signal by a high-pass filter, deriving a vertical contour enhancing signal from the video input signal by another high-pass filter and by adding these contour enhancing signals is added by an adder to the video input signal to improve the sharpness of the image contour, and circuits are provided for making variable the signal level of the image contour enhancing signal in the image area where both the horizontal and vertical contour enhancing signals are generated in overlapping relation.
摘要翻译：一种图像轮廓增强装置，其能够最小化在重叠关系中产生水平轮廓增强信号和垂直轮廓增强信号的图像区域中的图像轮廓的过度增强。在图像轮廓增强装置中，通过由高通滤波器从视频输入信号导出水平轮廓增强信号而产生的图像轮廓增强信号，通过另一高通滤波器从视频输入信号导出垂直轮廓增强信号，以及通过加法将这些轮廓增强信号加到视频输入信号上，以提高图像轮廓的清晰度，并且提供电路，用于使图像轮廓增强信号的信号电平变为图像区域中的水平和以重叠关系产生垂直轮廓增强信号。

5. 发明授权

US06757014B1 Video signal noise reduction apparatus, a method of reducing a noise in a video signal, and a recording medium storing a program of the method 失效
标题翻译：视频信号噪声降低装置，降低视频信号中的噪声的方法，以及存储该方法的程序的记录介质
公开(公告)号：US06757014B1
公开(公告)日：2004-06-29
申请号：US09549339
申请日：2000-04-14
申请人： Misa Kasahara
发明人： Misa Kasahara
IPC分类号： H04N5217
CPC分类号： H04N5/21
摘要： A pixel data outputting circuit outputs center and peripheral pixel data from a video signal. A difference calculation circuit calculates differences of the peripheral pixel data from the center pixel data. A correlation pixel data detecting circuit detects a portion of the peripheral data showing high correlation according to the differences and a threshold value. A counter counts the portion of the peripheral data showing high correlation. A selecting circuit responsive to the correlation pixel data detecting circuit selectively outputs a portion of the differences of the portion of the peripheral data. A summing circuit obtains a sum of the portion of the differences in accordance with the counting result. A dividing coefficient generating circuit generates a dividing coefficient of 2n according to the counting result. A dividing circuit divides the sum with the dividing coefficient. An adding circuit adds the dividing result to the center pixel data to generate an output video signal. A weighting circuit weights each of the portion of differences according to the predetermined priority, wherein the summing circuit obtains the sum from the weighted differences. The corresponding method and the corresponding recording medium storing the method are also disclosed.
摘要翻译：像素数据输出电路从视频信号输出中心和周边像素数据。差分计算电路计算周边像素数据与中心像素数据的差异。相关像素数据检测电路根据差异和阈值检测显示高相关性的外围数据的一部分。计数器对显示高相关性的外围数据的部分进行计数。响应于相关像素数据检测电路的选择电路选择性地输出外围数据的该部分的差异的一部分。求和电路根据计数结果获得部分差值的和。分频系数发生电路根据计数结果生成2 的分割系数。分频电路将和除以分频系数。加法电路将分割结果与中心像素数据相加以产生输出视频信号。加权电路根据预定优先级对差异的每一部分进行加权，其中求和电路从加权差获得和。还公开了相应的方法和存储该方法的相应记录介质。

6. 发明授权

US06567468B1 Motion detection circuit and a noise suppressing circuit including the same 失效
标题翻译：运动检测电路和包括该运动检测电路的噪声抑制电路
公开(公告)号：US06567468B1
公开(公告)日：2003-05-20
申请号：US09394684
申请日：1999-09-13
申请人： Noriyoshi Kato , Yukio Fujita , Misa Kasahara
发明人： Noriyoshi Kato , Yukio Fujita , Misa Kasahara
IPC分类号： H04N712
CPC分类号： G06T7/254
摘要： In a motion detection circuit, a difference signal between the video and one-frame delayed video signals is generated. An Edge signal is generated from the video and delayed video signals. Motion in a target pixel is judged from the interframe difference signal according to the edge signal. A motion judging circuit further includes an LPF and a selector for supplying an output of the LPF or the difference signal. The motion judging circuit may further includes: a peripheral pixel comparing circuit (may be bypassed) for detecting motion at the pixel by checking polarities of the difference signal at an area around the target pixel; a majority detection circuit (may be bypassed) for detecting a majority of the results of the polarity deviation detection circuit to judge the motion with deviation to a side of stopping; and a polarity deviation detecting circuit for judging the motion as moving in the presence of agreement of the polarities of all pixels at any of peripheral areas around the target pixel. The size of the peripheral areas are controlled. The polarity deviation circuit may compensate the result of the majority detection circuit. Width of the edge signal is controlled. A noise suppression apparatus including a motion detection circuit mentioned above is also disclosed.
摘要翻译：在运动检测电路中，产生视频和一帧延迟的视频信号之间的差分信号。从视频和延迟的视频信号产生边沿信号。根据边缘信号从帧间差分信号判断目标像素中的运动。运动判定电路还包括LPF和用于提供LPF的输出或差分信号的选择器。运动判断电路还可以包括：周边像素比较电路（可以旁路），用于通过检查目标像素周围的区域的差异信号的极性来检测像素上的运动; 多数检测电路（可以被旁路），用于检测极性偏差检测电路的大部分结果，以判断具有偏离停止侧的运动; 以及极性偏差检测电路，用于在存在目标像素周围的任何周边区域的所有像素的极性一致的情况下，将运动判断为移动。外围区域的大小被控制。极性偏差电路可以补偿多数检测电路的结果。边缘信号的宽度被控制。还公开了包括上述运动检测电路的噪声抑制装置。

7. 发明授权

US5926577A Video signal processing apparatus with noise reduction and edge enhancement 失效
标题翻译：具有降噪和边缘增强的视频信号处理装置
公开(公告)号：US5926577A
公开(公告)日：1999-07-20
申请号：US637490
申请日：1996-04-25
申请人： Misa Kasahara , Makoto Sube , Jun Ebisawa
发明人： Misa Kasahara , Makoto Sube , Jun Ebisawa
IPC分类号： H04N5/208 , H04N5/14 , H04N5/21 , H04N1/409 , G06T5/00
CPC分类号： H04N5/142 , H04N5/21
摘要： A video signal processing circuit for processing a video signal including a noise is disclosed which comprises: an edge enhancement signal generation circuit for generating an edge enhancement signal from the video signal; a noise reduction circuit for reducing a level of the noise to generate a noise reduced video signal; and an adder for adding the edge enhancement signal to the noise reduction video signal to output a processed video signal. The apparatus may further comprise an input terminal for receiving the video signal, wherein the edge enhancement signal generation circuit and the noise reduction circuit coupled to the input terminal are in parallel. This apparatus may further comprise a first delay circuit for delaying the video signal by one horizontal line period to generate a 1-H delayed video signal and a second delay circuit responsive to the video signal for generating a 2-H delayed video signal, wherein the edge enhancement signal generation circuit generates the edge enhanced signal from the video signal, the 1-H delayed video signal, and the 2-H delayed video signal and the noise reduction circuit generates the noise reduced video signal from the video signal, the 1-H delayed video signal, and the 2-H-delayed video signal.
摘要翻译：公开了一种用于处理包括噪声的视频信号的视频信号处理电路，其包括：边缘增强信号产生电路，用于从视频信号产生边缘增强信号; 用于降低噪声电平以产生降噪视频信号的噪声降低电路; 以及加法器，用于将边缘增强信号与降噪视频信号相加以输出经处理的视频信号。该装置还可以包括用于接收视频信号的输入端，其中耦合到输入端的边缘增强信号产生电路和降噪电路是并联的。该装置还可以包括用于将视频信号延迟一个水平行周期以产生1-H延迟视频信号的第一延迟电路和响应于视频信号产生2-H延迟视频信号的第二延迟电路，其中，边缘增强信号发生电路从视频信号，1-H延迟视频信号和2-H延迟视频信号产生边缘增强信号，并且噪声降低电路从视频信号产生降噪视频信号， H延迟视频信号和2-H延迟的视频信号。

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