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Detection and/or enhancement of contrast differences in digital image data
Detection and/or enhancement of contrast differences in digital image data
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机译:检测和/或增强数字图像数据中的对比度差异
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摘要
A method for obtaining and/or enhancing local contrast differences (LD) in digital image input data (in), wherein a local contrast measure (SADap) approximating a two-dimensional sum of absolute difference (SAD) measure is obtained by obtaining a first-dimension sum of absolute difference measure (energyVk(m, n)) representing a sum of absolute difference (SAD) in a first dimension of at least one image region, and obtaining the local contrast measure (SADap) as a second-dimension convoluted first-dimension sum of absolute difference measure by convoluting the first-dimension sum of absolute difference measure (energyVk(m, n)) in a second dimension of the at least one image region, is proposed, wherein the step of obtaining the local contrast measure (SADap) as the second-dimension convoluted first-dimension sum of absolute differences measure further includes an addition step wherein an energy term (Δlpfk(j)) representing a first-order difference on a distance (J) of a low pass filtered signal used in obtaining the first-dimension sum of absolute differences measure (energyVk(m, n)) and in obtaining the second-dimension convoluted first-dimension sum of absolute differences measure is introduced while obtaining the local contrast measure (SADap).
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机译:一种用于获得和/或增强数字图像输入数据(in)中的局部对比度差(LD)的方法,其中,局部对比度测量值(SAD ap Sup>)近似于绝对差的二维和(SAD) )度量是通过获取表示至少一个图像区域的第一维上的绝对差之和(SAD)的绝对差度量的一维和(energyV k Sub>(m,n))获得的,然后通过对绝对差值度量的一维和进行卷积(能量V k <,从而获得局部对比度度量(SAD ap Sup>)作为第二维卷积的绝对差度量的一维和)提出了在至少一个图像区域的第二维上的/ Sub>(m,n)),其中,获得作为第二维卷积的局部对比度测量值(SAD ap Sup>)的步骤绝对差的一维和度量还包括一个加法步骤,其中一个能量项(Δlpf k Sub>(j))表示ga关于低通滤波信号的距离(J)的一阶差分,用于获得绝对差分测量的第一维和(energyV k Sub>(m,n)),并用于获得第二个差分在获取局部对比度测度(SAD ap Sup>)的同时,引入了维数绝对值卷积的一维和差。
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