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    Digital image color correction device employing fuzzy logic
    4.
    发明授权
    Digital image color correction device employing fuzzy logic 失效
    Gerätzur Farbkorrektur von digitaler Bilder mit Fuzzy-Logik

    公开(公告)号：EP0927952B1

    公开(公告)日：2003-05-07

    申请号：EP97830730.4

    申请日：1997-12-30

    Applicant: STMicroelectronics S.r.l.

    Inventor： Colla, Federica ,  Mancuso, Massimo ,  Poluzzi, Rinaldo

    IPC: G06T1/00 ,  G06T7/40

    CPC classification number: H04N9/643 ,  G06T7/90 ,  H04N1/628

    Abstract: A digital image color correction device employing fuzzy logic, for correcting a facial tone image portion of a digital video image, characterized in that it comprises: a pixel fuzzifier unit (1) receiving in input a stream of pixels belonging to a sequence of correlated frames of a digital video image and computing a multi level value representing a membership of each pixel to a skin color class; a global parameter estimator (2) receiving in input each of said pixel and the relative membership value, and computing a first and a second parameter which define the characteristics of a portion of said image that belongs to said skin color class; a processing unit (3) connected downstream to said global parameter estimator and to said pixel fuzzifier unit and adapted to correct each of the pixels of said portion of the image that belongs to said skin color class, according to said first global parameter (300), to obtain corrected pixels; and a processing switch (4) for outputting said pixels or said corrected pixels according to said second global parameter (400).

    Abstract translation: 一种采用模糊逻辑的数字图像颜色校正装置，用于校正数字视频图像的面部色调图像部分，其特征在于，其包括：像素模糊器单元（1），其在输入端接收属于相关帧序列的像素流 并且将表示每个像素的隶属度的多级值计算为肤色等级; 全局参数估计器（2），其中输入每个所述像素和相对隶属值，并且计算定义属于所述肤色类的所述图像的一部分的特征的第一和第二参数; 连接到所述全局参数估计器的下游的处理单元（3）和所述像素模糊器单元，并且适于根据所述第一全局参数（300）来校正属于所述皮肤颜色等级的所述图像的所述部分的每个像素， ，以获得校正像素; 以及用于根据所述第二全局参数（400）输出所述像素或所述校正像素的处理开关（4）。

    Noise filter for Bayer pattern image data
    5.
    发明公开
    Noise filter for Bayer pattern image data 有权
    StörschutzfilterfürBayermusterbilddaten

    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。

    A method for merging digital images to obtain a high dynamic range digital image
    8.
    发明公开
    A method for merging digital images to obtain a high dynamic range digital image 有权
    具有更宽的动态范围，一种用于产生数字图像的数字图像的方法混合

    公开(公告)号：EP1313066A8

    公开(公告)日：2003-09-10

    申请号：EP01830713.2

    申请日：2001-11-19

    Applicant: STMicroelectronics S.r.l.

    Inventor： Castorina, Alfio ,  Mancuso, Massimo ,  Battiato, Sebastiano

    IPC: G06T5/50

    CPC classification number: G06T5/50 ,  G06T2207/20208

    Abstract: A method of processing digital source images, each represented by pixel matrices, to obtain from two or more source images, representing one and the same real scene and acquired by utilizing different exposure levels, a final digital image capable of reproducing the real scene with an exposure latitude greater than that of each of the source images. The method, which can be advantageously used in digital still cameras, produces the final image by combining the source images with the help of a weighted mean constructed pixel by pixel. Thanks to a special filtering to which the weighting coefficients are subjected before the weighted mean operation, the method obtains a final image in which the source images are harmoniously combined with each other. A variant of the method can also be applied directly to digital images in CFA (Colour Filter Array) format.

    A method of compressing digital images
    9.
    发明公开
    A method of compressing digital images 审中-公开
    Verfahren zum Komprimieren Digitaler Bilder

    公开(公告)号：EP1173025A1

    公开(公告)日：2002-01-16

    申请号：EP00202437.0

    申请日：2000-07-10

    Applicant: STMicroelectronics S.r.l.

    Inventor： Bruna, Arcangelo ,  Mancuso, Massimo ,  Galluzzo, Agostino

    IPC: H04N7/30

    CPC classification number: H04N19/94 ,  H04N19/126 ,  H04N19/14 ,  H04N19/15 ,  H04N19/18 ,  H04N19/182 ,  H04N19/186 ,  H04N19/196 ,  H04N19/60

    Abstract: A method (300) of compressing a digital image including a matrix of elements each one consisting of at least one component of different type representing a pixel, the method comprising the steps of splitting (340) the digital image into a plurality of blocks and calculating, for each block, a group of DCT coefficients for the components of each type, and quantizing (350a-355a) the DCT coefficients of each group using a corresponding quantization table scaled by a gain factor for achieving a target compression factor; the method also comprises the steps of further quantizing (350-355) the DCT coefficients of each group using the corresponding quantization table scaled by a pre-set factor, arranging (360) the further quantized DCT coefficients in a zig-zig vector, calculating (365-370) a basic compression factor provided by the quantization table scaled by the pre-set factor as a first function of the zigzag vector, and estimating (375) the gain factor as a second function of the basic compression factor, the second function being determined experimentally according to the target compression factor.

    Abstract translation: 一种压缩数字图像的方法（300），包括由表示像素的不同类型的至少一个分量组成的元素矩阵，所述方法包括以下步骤：将数字图像分割（340）成多个块并计算 对于每个块，使用用于每种类型的分量的一组DCT系数，并且使用由用于实现目标压缩因子的增益因子缩放的对应量化表量化（350a-355a）每个组的DCT系数; 该方法还包括以下步骤：使用由预设因子缩放的相应量化表进一步量化（350-355）每个组的DCT系数，将其它量化的DCT系数排列（360）为Zig向量，计算 （365-370）由预置因子缩放的量化表提供的基本压缩因子作为之字形向量的第一函数，并且将增益因子估计为（375）作为基本压缩因子的第二函数，第二 功能根据目标压缩因子实验确定。

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