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1. 发明授权

US06941028B2 System and method for image enhancement, dynamic range compensation and illumination correction 失效
标题翻译：用于图像增强，动态范围补偿和照明校正的系统和方法
公开(公告)号：US06941028B2
公开(公告)日：2005-09-06
申请号：US09843834
申请日：2001-04-30
申请人： Ronny Kimmel , Michael Elad , Doron Shaked , Renato Keshet , Irwin Sobel
发明人： Ronny Kimmel , Michael Elad , Doron Shaked , Renato Keshet , Irwin Sobel
IPC分类号： G06K9/46 , G06T3/40 , G06T5/00 , G06T7/00 , H04N1/407 , G06K9/40
CPC分类号： G06K9/4661 , G06T5/007 , G06T2207/10024 , G06T2207/20016
摘要： A system and a method solve the estimation problem of finding reflectance R and illumination L. The system and method to solve a functional of the unknown illumination L such that a minimum of the functional is assumed to yield a good estimate of the illumination L. Having a good estimate of the illumination L implies a good estimate of the reflectance R. The functional uses a variational framework to express requirements for the optimal solution. The requirements include: 1) that the illumination L is spatially smooth; 2) that the reflectance values are in the interval [0,1] —thus, when decomposing the image S, the solution should satisfy the constraint L>S; 3) that among all possible solutions, the estimate of the illumination L should be as close as possible to the image S, so that the contrast of the obtained R is maximal; and 4) that the reflectance R complies with typical natural image behavior (e.g., the reflectance is piece-wise smooth).
摘要翻译：一种系统和方法解决了找到反射率R和照明L的估计问题。解决未知照明L的功能的系统和方法，使得假定功能的最小值产生对照明L的良好估计。具有对照明L的良好估计意味着对反射率R的良好估计。功能使用变分框架来表达对最优解的要求。要求包括：1）照明L在空间上平滑; 2）反射率值在[0,1]之间，当分解图像S时，溶液应满足约束L> S; 3）在所有可能的解决方案中，照明L的估计应尽可能接近图像S，使得所获得的R的对比度最大; 和4）反射率R符合典型的自然图像行为（例如，反射率是分段平滑的）。

2. 发明授权

US06731822B1 Method and apparatus for filtering images having insufficient tonal precision 失效
标题翻译：用于滤波色调精度不足的图像的方法和装置
公开(公告)号：US06731822B1
公开(公告)日：2004-05-04
申请号：US09429245
申请日：1999-10-28
申请人： Irwin Sobel , Ronny Kimmel
发明人： Irwin Sobel , Ronny Kimmel
IPC分类号： G06T500
CPC分类号： G06T5/002 , G06T2207/20016
摘要： An array of n-bit words representing an image is filtered to produce a corresponding array of higher precision m-bit words representing the image. During the filtering, upper and lower bounds for the m-bit words are identified, and values for the m-bit words are selected between the upper and lower bounds. There is at least some spatial smoothness between the selected values. For example, the values may be selected at sample points of a curve or surface between the upper and lower bounds.
摘要翻译：表示图像的n位字的阵列被过滤以产生表示图像的较高精度m位字的相应阵列。在过滤期间，识别m位字的上限和下限，并且在上限和下限之间选择m位字的值。所选值之间至少有一些空间平滑度。例如，可以在上限和下限之间的曲线或表面的采样点处选择值。

3. 发明授权

US06816197B2 Bilateral filtering in a demosaicing process 有权
标题翻译：双面过滤在去马赛克过程中
公开(公告)号：US06816197B2
公开(公告)日：2004-11-09
申请号：US09814672
申请日：2001-03-21
申请人： Renato Keshet , Danny Barash , Doron Shaked , Michael Elad , Ronny Kimmel
发明人： Renato Keshet , Danny Barash , Doron Shaked , Michael Elad , Ronny Kimmel
IPC分类号： H04N5335
CPC分类号： G06T3/4015
摘要： Demosaicing convolution kernels are incorporated into the framework of bilateral filtering in order to reduce artifacts at abrupt intensity transitions when a color mosaic pattern is converted to an output image. As a consequence of the bilateral filtering within a window that is selected without intensity considerations, intensity values of pixels that are physically close are given greater weight than intensity values of more distant pixels and, simultaneously, intensity values that are quantitatively similar (i.e., photometrically similar) are given greater weight than intensity values that are quantitatively dissimilar. Using photometric similarity in a demosaicing operation reduces the effects of pixels on one side of an abrupt intensity transition in determining interpolated intensity values for pixels on the opposite side of the abrupt intensity transition.
摘要翻译：将去马赛克卷积核并入到双边过滤的框架中，以便当将彩色马赛克图案转换为输出图像时，在突然强度转换时减少伪像。作为在没有强度考虑的窗口内的双边滤波的结果，物理上接近的像素的强度值被赋予比更远的像素的强度值更大的权重，并且同时具有定量相似的强度值（即，光度法相似）被赋予比定量不相似的强度值更大的权重。在去马赛克操作中使用光度相似性在确定突然强度转变的相对侧上的像素的内插强度值中减少突然强度转变的一侧的像素的影响。

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