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    • 3. 发明申请
    • Noise reduction apparatus of frame recursive type
    • 帧递归型降噪装置
    • US20070247554A1
    • 2007-10-25
    • US11785420
    • 2007-04-17
    • Kenji OkumichiHirofumi Kawaguchi
    • Kenji OkumichiHirofumi Kawaguchi
    • H04N5/00
    • G06T5/002G06T5/50G06T2207/10016G06T2207/10024H04N5/21H04N9/646
    • Disclosed is a noise reduction apparatus of a frame recursive type which can reduce occurrence of an afterimage phenomenon such as blurring or trailing of contours of motion images even when the difference between image frames is small. In the noise reduction apparatus, a frame recursive type filter generates a differential image signal representing a difference between a current input image signal and a delayed image signal obtained by delaying the input image signal by at least one frame period, reduces noise in the differential image signal thereby to generate a feedback image signal, and adds the feedback image signal to the current input image signal. A level adjuster adjusts a level of the feedback image signal to a lower level as a level of a luminance or color component of the input image signal is decreased.
    • 公开了一种帧递归类型的降噪装置,即使在图像帧之间的差异小的情况下,也可以减少运动图像的轮廓的模糊或拖尾等残留现象的发生。 在降噪装置中,帧递归型滤波器生成表示当前输入图像信号与通过将输入图像信号延迟至少一个帧周期而获得的延迟图像信号之间的差的差分图像信号,减小差分图像中的噪声 从而产生反馈图像信号,并将反馈图像信号添加到当前输入图像信号。 当输入图像信号的亮度或颜色分量的电平减小时,电平调节器将反馈图像信号的电平调节到较低电平。
    • 5. 发明授权
    • Block noise removal device
    • 块噪声去除装置
    • US08023765B2
    • 2011-09-20
    • US11785485
    • 2007-04-18
    • Kenji OkumichiHirofumi Honda
    • Kenji OkumichiHirofumi Honda
    • G06K9/40
    • H04N19/86H04N19/117H04N19/14H04N19/176H04N19/42H04N19/61H04N19/80
    • A block noise removal device classifies interpixel differential values by using a block size N of the decoded video signal. The block noise removal device accumulates the interpixel differential values in the pixels disposed in the nth position. The results of the accumulation provide first to Nth block noise values. A block boundary position signal is produced that represents the pixel position in the pixel group that corresponds with the largest block noise value. The larger of two block noise values of the adjacent pixels on both sides of the pixel having the largest block noise value is taken as the phase error block noise value. A phase error signal is generated on the basis of the ratio between the phase error block noise value and the largest block noise value, block noise removal processing is effected, and the phase correction pixel sample value is obtained.
    • 块噪声去除装置通过使用解码视频信号的块大小N来对像素间差分值进行分类。 块噪声去除装置在设置在第n位置的像素中积累像素间差分值。 积累的结果提供了第一到第N个块噪声值。 产生表示与最大块噪声值对应的像素组中的像素位置的块边界位置信号。 将具有最大块噪声值的像素的两侧的相邻像素的两个块噪声值中的较大者作为相位误差块噪声值。 基于相位误差块噪声值和最大块噪声值之间的比率产生相位误差信号,进行块噪声去除处理,并获得相位校正像素采样值。
    • 6. 发明申请
    • Block noise removal device
    • 块噪声去除装置
    • US20070242896A1
    • 2007-10-18
    • US11785485
    • 2007-04-18
    • Kenji OkumichiHirofumi Honda
    • Kenji OkumichiHirofumi Honda
    • G06K9/40
    • H04N19/86H04N19/117H04N19/14H04N19/176H04N19/42H04N19/61H04N19/80
    • A block noise removal device classifies, into separate pixel groups, interpixel differential values by using a block size N (where N is an integer) of the decoded video signal or by using M which is an integer multiple of the block size N. The block noise removal device accumulates the interpixel differential values in the pixels disposed in the nth position (where n is 1 to N or 1 to M) in the respective pixel groups. This accumulation is performed for each of the first to Nth positions or the first to Mth positions in all the pixel groups. The results of the accumulation provide first to Nth block noise values or first to Mth block noise values. Then, the largest block noise value among the first to Nth block noise values or the first to Mth block noise values is found. A block boundary position signal is produced that represents, as a block boundary position, the pixel position in the pixel group that corresponds with the largest block noise value. The larger of two block noise values of the adjacent pixels on both sides of the pixel having the largest block noise value is taken as the phase error block noise value. A phase error signal is then generated on the basis of the ratio between the phase error block noise value and the largest block noise value. Block noise removal processing is effected on the basis of a phase correction pixel sample value. The phase correction pixel sample value is obtained by performing phase correction processing based on the phase error signal on the decoded video signal.
    • 块噪声去除装置通过使用解码视频信号的块大小N(其中N是整数)或通过使用作为块大小N的整数倍的M来将分组像素组分类为差分值。块 噪声去除装置在各像素组中的第n位置(n为1〜N或1〜M)的像素中累积像素间差分值。 对所有像素组中的第一至第N位置或第一至第M位置中的每一个执行累加。 积累的结果提供第一至第N个块噪声值或第一至第M个块噪声值。 然后,找到第一至第N块噪声值或第一至第M块噪声值中的最大块噪声值。 产生块边界位置信号,其表示与最大块噪声值相对应的像素组中的像素位置作为块边界位置。 将具有最大块噪声值的像素的两侧的相邻像素的两个块噪声值中的较大者作为相位误差块噪声值。 然后基于相位误差块噪声值和最大块噪声值之间的比率生成相位误差信号。 基于相位校正像素采样值进行块噪声去除处理。 通过对解码后的视频信号进行基于相位误差信号的相位校正处理来获得相位修正像素采样值。
    • 7. 发明申请
    • Block noise removal device
    • 块噪声去除装置
    • US20080037893A1
    • 2008-02-14
    • US11785347
    • 2007-04-17
    • Kenji OkumichiHirofumi Honda
    • Kenji OkumichiHirofumi Honda
    • G06K9/40
    • H04N19/59H04N19/14H04N19/176H04N19/182H04N19/42H04N19/61H04N19/86
    • A block noise removal device calculates a block boundary correction value. This correction value indicates a correction amount for a pixel sample value immediately before a block boundary position and a correction amount for a pixel sample value immediately after the block boundary position for each block boundary position in a pixel sample value sequence. Each pixel sample value represents a level of each pixel in a video signal. The block noise removal device obtains the block boundary correction value based on at least two consecutive pixel sample values immediately before the block boundary position and at least two consecutive pixel sample values immediately after the block boundary position. The block noise removal device then generates a block noise correction signal representing a correction amount for the pixel sample values corresponding to respective pixels in the pixel block is generated by performing interpolation computations based on the block boundary correction value found for each two adjacent block boundary positions. The block noise removal device adds the block noise correction signal to the video signal to produce a noise-removed video signal from which block noise has been removed.
    • 块噪声去除装置计算块边界校正值。 该修正值表示紧接在块边界位置之前的像素采样值和紧接在像素采样值序列中的每个块边界位置的块边界位置之后的像素采样值的校正量的校正量。 每个像素采样值表示视频信号中每个像素的电平。 块噪声去除装置基于紧接在块边界位置之前的至少两个连续像素采样值和紧接在块边界位置之后的至少两个连续像素采样值获得块边界校正值。 块噪声去除装置然后产生块噪声校正信号,该块噪声校正信号表示通过基于为每两个相邻块边界位置找到的块边界校正值进行插值计算来生成与像素块中的各个像素对应的像素采样值的校正量 。 块噪声去除装置将块噪声校正信号添加到视频信号以产生去除噪声的视频信号,从而消除块噪声。
    • 8. 发明授权
    • Block noise removal device
    • 块噪声去除装置
    • US07974491B2
    • 2011-07-05
    • US11785347
    • 2007-04-17
    • Kenji OkumichiHirofumi Honda
    • Kenji OkumichiHirofumi Honda
    • G06K9/40
    • H04N19/59H04N19/14H04N19/176H04N19/182H04N19/42H04N19/61H04N19/86
    • A block noise removal device calculates a block boundary correction value which indicates a correction amount for a pixel sample value immediately before a block boundary position and a correction amount for a pixel sample value immediately after the block boundary position for each block boundary position in a pixel sample value sequence. The block noise removal device obtains the block boundary correction value based on at least two consecutive pixel sample values immediately before the block boundary position and at least two consecutive pixel sample values immediately after the block boundary position. The block noise removal device generates a block noise correction signal representing a correction amount for the pixel sample values corresponding to respective pixels in the pixel block by performing interpolation computations based on the block boundary correction value found for each two adjacent block boundary positions.
    • 块噪声去除装置计算块边界校正值,该块边界校正值表示紧接在块边界位置之前的像素采样值的校正量和紧接在像素中的每个块边界位置的块边界位置之后的像素采样值的校正量 样本值序列。 块噪声去除装置基于紧接在块边界位置之前的至少两个连续像素采样值和紧接在块边界位置之后的至少两个连续像素采样值获得块边界校正值。 块噪声去除装置通过基于为每两个相邻块边界位置找到的块边界校正值进行插值计算,生成表示与像素块中的各个像素对应的像素样本值的校正量的块噪声校正信号。