公开(公告)号：US09031322B2

公开(公告)日：2015-05-12

申请号：US13897001

申请日：2013-05-17

Applicant: Novatek Microelectronics Corp.

Inventor： Kuan-Kang Lai

IPC: G06K9/00 ,  G06T7/00

CPC classification number: G06T7/0002 ,  G06T2207/10016 ,  G06T2207/20021 ,  G06T2207/20076 ,  G06T2207/30168

Abstract: A noise estimation apparatus for calculating a noise estimation value of a frame of an image is provided. The noise estimation apparatus includes a distribution calculation unit, a variance calculation unit, a distribution curve generation module and a noise estimation unit. The distribution calculation unit generates a pixel distribution according to multiple pixel data of an ith block of the frame and multiple previous pixel data of the ith block of a previous frame. The variance calculation unit combines the pixel data and the previous pixel data to generate a variance value. The curve distribution generation module generates a curve distribution according to the variance value, and compares the pixel distribution with the curve distribution to generate a weighting value. The noise estimation unit outputs the noise estimation value according to the weighting value and the variance value corresponding to each of the blocks of the frame.

Abstract translation: 提供了一种用于计算图像的帧的噪声估计值的噪声估计装置。 噪声估计装置包括分布计算单元，方差计算单元，分布曲线生成模块和噪声估计单元。 分布计算单元根据帧的第i个块的多个像素数据和先前帧的第i个块的前一个像素数据生成像素分布。 方差计算单元组合像素数据和先前像素数据以生成方差值。 曲线分布生成模块根据方差值生成曲线分布，并将像素分布与曲线分布进行比较，生成加权值。 噪声估计单元根据与帧的每个块对应的加权值和方差值来输出噪声估计值。