Definiens Developer 7 - PCI Geomatics

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Definiens Developer 7 - Reference Book1 Introduction1 IntroductionThis Reference Book lists detailed information about algorithms and features, andprovides general reference information. For individual image analysis and rule setdevelopment you may wish to keep a printout ready at hand.Algorithms Reference onpage 11Features Reference onpage 836
Definiens Developer 7 - Reference Book2 About Rendering a DisplayedImage2 About Rendering a DisplayedImageThe eCognition image renderer creates the displayed image in two steps.1. The first step reads out the displayed area from the selected image layers according tothe screen size and zoom settings. Then image layer equalization is applied. Theresult is an 8-bit raw gray value image for each image layer. These gray valueimages are mixed into one raw RGB image by a layer mixer according to the currentlayer mixing settings.2. Finally the image equalizing is applied to create the output RGB image that isdisplayed on the screen.About Image LayerEqualization on page 7About ImageEqualization on page 8Figure 1: The rendering process of an image displayed in the project view.2.1 About Image Layer EqualizationImage layer equalization is part of the rendering process of the image display within theproject view.Image layer equalization maps the input data of an image layer which may havedifferent intensity ranges to the unified intensity range [0...255] of an 8-bit gray valueimage. For 8-bit data no image layer equalization is necessary. All other data types haveto be converted into an 8-bit representation at this step of the rendering process.This function is implemented as a mapping of the input range to the display rangeof [0...255]. Image layer equalization can be either linear or manual.About Linear Image Layer EqualizationBy default, the input data is mapped to the gray value range by a linear function.Data Type Input Range Mapping Function8-bit [0...255] c s = c k (no transformation)16-bit unsigned; [0...max 2 (c k )] c s = 255 * c k / max 2 (c k )32-bit unsigned16-bit signed; [min 2 (c k )...max 2 (c k )] c s = 255*(c k -min 2 (c k ))/(max 2 (c k )-min 2 (c k ))32-bit signed32-bit float [min 10 (c k )...max 10 (c k )] c s = 255*(c k -min 10 (c k ))/(max 10 (c k )-min 10 (c k ))c k : intensity value in image layer k7
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Definiens Developer 7 - PCI Geomatics

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