Definiens Developer 7 - PCI Geomatics

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Definiens Developer 7 - Reference Book2 About Rendering a DisplayedImagec s : intensity value on the screenmin 2 (c k ) = max { x : x = -2 n ; x
Definiens Developer 7 - Reference Book2 About Rendering a DisplayedImageNoneNo (None) equalization allows you to see the image data as it is, which can be helpful atthe beginning of rule set development, when looking for an approach.The output from the image layer mixing is displayed without further modification.Input Range Mapping Function[0...255] [0...255]Linear EqualizationLinear equalization with 1.00% is the default for new scenes. Commonly it displaysimages with a higher contrast as without image equalization.Linear equalization maps each color Red, Green, and Blue (RGB) from an input range[c min ...c max ] to the available screen intensity range [0...255] by a linear mapping. The inputrange can be modified by the percentage parameter p. The input range is computedsuch that p percent of the pixels are not part of the input range. In case p=0 this meansthe range of used color values is stretched to the range [0....255]. For p>0 the mappingignores p/2 percent of the darkest pixels and p/2 percent of the brightest pixels. In manycases a small value of p lead to better results because the available color range can bebetter used for the relevant data by ignoring the outliers.c min = max { c : #{ (x,y) : c k (x,y) < c min } / (sx*sy) >= p/2 }c max = min { c : #{ (x,y) : c k (x,y) > c max } / (sx*sy) >= p/2 }About Image LayerEqualization on page 7Input Range Mapping Function[c min ...c max ] c s = 255*(c k -c min )/(c max -c min ))For images with no color distribution (i.e. all pixels having the same intensity) the resultof Linear equalization will be a black image independent of the image layer intensities.Standard Deviation EqualizationWith its default parameter of 3.0, Standard deviation renders a similar display as Linearequalization. Use a parameter around 1.0 for an exclusion of dark and bright outliers.Standard deviation equalization maps the input range to the available screen intensityrange [0...255] by a linear mapping. The input range [c min ...c max ] can be modified by thewidth p. The input range is computed such that the center of the input range representsthe mean value of the pixel intensities mean(c k ). The left and right borders of the inputrange are computed by taking the n times the standard deviation σ k to the left and theright. You can modify e the parameter n.c min = mean(c k ) - n * σ kc max = mean(c k ) + n * σ kInput Range Mapping Function[c min ...c max ] c s = 255*(c k -c min )/(c max -c min ))Gamma Correction EqualizationGamma correction equalization is used to improve the contrast of dark or bright areasby spreading the corresponding gray values.Gamma correction equalization maps the input range to the available screen intensityrange [0...255] by a polynomial mapping. The input range [c min ...c max ] cannot be bemodified and is defined by the smallest and the largest existing pixel values.9
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