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5Contrast%20stretchPowerpnts

5Contrast%20stretchPowerpnts - The Contrast Stretch Image...

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The Contrast Stretch Image enhancement has become an important part of GIS Image enhancement is map generalization with raster imagery Image is a database:Snapshot in time The Image Analyst decides what is important Necessary to reduce or generalize
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Visual Thresholds Humans can resolve 8-16 grey tones simultaneously Others interpreted as patterns and textures Image Enhancement is map generalization Reduce information to what is needed Enhance differences that may be slight
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Image Enhancement Does not find anything that is not in the raw data, but Using tone (grey scale) to enhance Pattern Texture Shape Context
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Histogram Equalization Program tries to reasign rasters to grey scales Attempts to put an equal amount in each grey scale, 0-255 Does this by combining groups of grey scale values May distort spectral characteristics Chief advantage: Quick and easy
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Typical Reflectance Water, Trees, Grass, Buildings True for visible and NIR wavelengths
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Image Histogram (Single band)
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