公开(公告)号：EP1394742A1

公开(公告)日：2004-03-03

申请号：EP02425532.5

申请日：2002-08-23

Applicant: STMicroelectronics S.r.l.

Inventor： Bosco, Angelo ,  Battiato, Sebastiano

IPC: G06T5/20

CPC classification number: G06T5/20

Abstract: A method for filtering the noise of a sequence of digital images (Img 1 ,..., Img n , Img n+1 ,...) in CFA format comprising the following phases:

processing a first CFA image (Img n-1 ) of the sequence to obtain a corresponding improved CFA image (f_Img n-1 ) with reduced noise;
processing at least one pixel (p n (x,y)) of a second CFA image (Img n ) of the sequence that temporally follows said first image (Img n-1 ), said phase of processing at least one pixel providing a corresponding filtered pixel (f_p n (x,y)) and including the following operations:

selecting (SW_ sel) a first set of pixels (SW n (x,y)) comprising said at least one pixel and a plurality of pixels of the second CFA image spatially adjacent to it;
selecting (TW_sel) a second set of pixels (TW n (x,y)) comprising pixels of the improved CFA image homologous with the pixels of said first set;
carrying out a digital filtering of a first type (ST_fliter) using pixels forming part of said first and second set to generate the filtered pixel (f_p n (x,y)).

Abstract translation: 一种用于过滤CFA格式的数字图像序列（Img1，...，Imgn，Imgn + 1，...）的噪声的方法，包括以下阶段：处理序列的第一CFA图像（Imgn-1） 以获得具有降低的噪声的相应改进的CFA图像（f_Imgn-1）; 处理在时间上在所述第一图像（Imgn-1）之后的序列的第二CFA图像（Imgn）的至少一个像素（pn（x，y）），所述处理的至少一个像素的相位提供相应的滤波像素 f_pn（x，y））并且包括以下操作：选择（SW_ sel）包括所述至少一个像素的第一组像素（SWn（x，y））和与空间相邻的第二CFA图像的多个像素 它; 选择（TW_sel）包括与所述第一组的像素同源的改进的CFA图像的像素的第二组像素（TWn（x，y））; 使用形成所述第一和第二组的一部分的像素进行第一类型（ST_fliter）的数字滤波以产生滤波像素（f_pn（x，y））。

公开(公告)号：EP1394742B1

公开(公告)日：2007-12-12

申请号：EP02425532.5

申请日：2002-08-23

Applicant: STMicroelectronics S.r.l.

Inventor： Bosco, Angelo ,  Battiato, Sebastiano

IPC: G06T5/20

CPC classification number: G06T5/20

公开(公告)号：EP1289309A1

公开(公告)日：2003-03-05

申请号：EP01830562.3

申请日：2001-08-31

Applicant: STMicroelectronics S.r.l.

Inventor： Bosco, Angelo ,  Mancuso, Massimo

IPC: H04N9/04 ,  G06T5/20

CPC classification number: H04N5/217 ,  G06T3/4015 ,  G06T5/002 ,  G06T5/20 ,  G06T2207/10024 ,  G06T2207/20012 ,  G06T2207/20192 ,  H04N9/045

Abstract: A method of filtering and an image filter (10) is disclosed. The filter is provided for a digital camera including image sensors sensitive to light, a color filter placed over sensitive elements of the sensors and patterned according to a Bayer mosaic pattern layout and an interpolation algorithm joining together the digital information provided by differently colored adjacent pixels in said Bayer pattern. The filter (10) is adaptive and includes a noise level computation block (26) for operating directly on a said Bayer pattern data set of for each color channel thus removing noise while simultaneously preserving picture detail.

Abstract translation: 公开了一种滤波方法和图像滤波器（10）。 提供了一种用于包括对光敏感的图像传感器的数字照相机的滤光器，放置在传感器的敏感元件上的滤色器，并根据拜耳镶嵌图案布局图案化，并且将由不同颜色的相邻像素提供的数字信息连接在一起的插值算法 拜耳模式 滤波器（10）是自适应的，并且包括用于直接在每个颜色通道的所述拜耳图案数据集上操作的噪声电平计算块（26），从而消除噪声，同时保留图像细节。