公开(公告)号：US20150117782A1

公开(公告)日：2015-04-30

申请号：US14069181

申请日：2013-10-31

Applicant: STMicroelectronics Asia Pacific Pte. Ltd.

Inventor： Xiaoyun Deng ,  Lucas Hui

IPC: G06K9/40 ,  G06T5/00

CPC classification number: G06K9/40 ,  G06T5/002 ,  G06T2207/10024 ,  G06T2207/20012

Abstract: A method and apparatus are provided for detecting banding noise in a digital signal representative of an image. The method includes determining, by a banding noise detector, a count of increment steps in pixel values and a count of decrement steps in pixel values along a filter direction in a neighborhood of a current pixel of the image, checking, by the banding noise detector, if the count of increment steps or the count of decrement steps in the neighborhood of a current pixel exceeds a step threshold value, and classifying, by the banding noise detector, the current pixel as being located in the banding noise zone if the count of increment steps or the count of decrement steps does not exceed the step threshold value.

Abstract translation: 提供了一种用于检测表示图像的数字信号中的条带噪声的方法和装置。 该方法包括通过条带噪声检测器确定像素值中的增量步长的计数和沿图像的当前像素附近的滤波器方向的像素值中的递减步长的计数，由带状噪声检测器 如果当前像素附近的递增步数或递减步数的计数超过阶梯阈值，并且由带状噪声检测器将当前像素分类为位于条带噪声区中，如果计数 递增步骤或递减步数的计数不超过阶梯阈值。

公开(公告)号：US20150117793A1

公开(公告)日：2015-04-30

申请号：US14068656

申请日：2013-10-31

Applicant: STMicroelectronics Asia Pacific Pte. Ltd.

Inventor： Xiaoyun Deng ,  Lucas Hui

IPC: G06T5/00

CPC classification number: G06T5/002 ,  G06T5/20 ,  G06T2207/10016 ,  G06T2207/20012

Abstract: A method and apparatus are provided for filtering banding noise in a signal representative of an image. The method includes detecting, by a banding noise detector, banding noise in a neighborhood of a current pixel of the image, determining, by an adaptive filter weight decision unit, a number of banding steps in the neighborhood of the current pixel, determining, by the adaptive filter weight decision unit, a difference between a current pixel value and a previous output value, selecting, by the adaptive filter weight decision unit, a filter weight based on the number of banding steps, the difference between the current pixel value and the previous output value, and the detected banding noise, and filtering, by a recursive filter, the current pixel value according to the selected filter weight.

Abstract translation: 提供了一种方法和装置，用于对代表图像的信号中的条带噪声进行滤波。 该方法包括通过带状噪声检测器检测图像的当前像素附近的条带噪声，通过自适应滤波器权重判定单元确定当前像素附近的条带步数，通过 自适应滤波器权重判定单元，当前像素值和先前输出值之间的差，由自适应滤波器权重判定单元选择基于条带数的滤波器权重，当前像素值与 先前输出值和检测到的条带噪声，并且通过递归滤波器根据所选滤波器权重对当前像素值进行滤波。

公开(公告)号：US09092856B2

公开(公告)日：2015-07-28

申请号：US14068656

申请日：2013-10-31

Applicant: STMicroelectronics Asia Pacific Pte. Ltd.

Inventor： Xiaoyun Deng ,  Lucas Hui

IPC: G06K9/40 ,  G06T5/00

CPC classification number: G06T5/002 ,  G06T5/20 ,  G06T2207/10016 ,  G06T2207/20012

Abstract: A method and apparatus are provided for filtering banding noise in a signal representative of an image. The method includes detecting, by a banding noise detector, banding noise in a neighborhood of a current pixel of the image, determining, by an adaptive filter weight decision unit, a number of banding steps in the neighborhood of the current pixel, determining, by the adaptive filter weight decision unit, a difference between a current pixel value and a previous output value, selecting, by the adaptive filter weight decision unit, a filter weight based on the number of banding steps, the difference between the current pixel value and the previous output value, and the detected banding noise, and filtering, by a recursive filter, the current pixel value according to the selected filter weight.

Abstract translation: 提供了一种方法和装置，用于对代表图像的信号中的条带噪声进行滤波。 该方法包括通过带状噪声检测器检测图像的当前像素附近的条带噪声，通过自适应滤波器权重判定单元确定当前像素附近的条带步数，通过 自适应滤波器权重判定单元，当前像素值和先前输出值之间的差，由自适应滤波器权重判定单元选择基于条带数的滤波器权重，当前像素值与 先前输出值和检测到的条带噪声，并且通过递归滤波器根据所选滤波器权重对当前像素值进行滤波。

公开(公告)号：US09183453B2

公开(公告)日：2015-11-10

申请号：US14069181

申请日：2013-10-31

Applicant: STMicroelectronics Asia Pacific Pte. Ltd.

Inventor： Xiaoyun Deng ,  Lucas Hui

IPC: G06K9/40 ,  G06T5/00

CPC classification number: G06K9/40 ,  G06T5/002 ,  G06T2207/10024 ,  G06T2207/20012

Abstract: A method and apparatus are provided for detecting banding noise in a digital signal representative of an image. The method includes determining, by a banding noise detector, a count of increment steps in pixel values and a count of decrement steps in pixel values along a filter direction in a neighborhood of a current pixel of the image, checking, by the banding noise detector, if the count of increment steps or the count of decrement steps in the neighborhood of a current pixel exceeds a step threshold value, and classifying, by the banding noise detector, the current pixel as being located in the banding noise zone if the count of increment steps or the count of decrement steps does not exceed the step threshold value.

Abstract translation: 提供了一种用于检测表示图像的数字信号中的条带噪声的方法和装置。 该方法包括通过条带噪声检测器确定像素值中的增量步长的计数和沿图像的当前像素附近的滤波器方向的像素值中的递减步长的计数，由带状噪声检测器 如果当前像素附近的递增步数或递减步数的计数超过阶梯阈值，并且由带状噪声检测器将当前像素分类为位于条带噪声区中，如果计数 递增步骤或递减步数的计数不超过阶梯阈值。