6filteringPowerpnts

6filteringPowerpnts - Unit 4 Spatial Filtering Contrast...

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Unit 4 Spatial Filtering Contrast Enhancement involves linear histgram changes No way to take bvs of similar values and separate – Vegetation in fields same as – Vegetation in urban areas Spatial filtering enhances based on – Surrounding pixels – Incorporates some elements of • Site and situation • Context • Pattern •T e x t u r e Two Things filtering does – Enhance details – Suppress details
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High and Low Spatial Frequency Information • Low frequency = few changes – 5554555556666666 – Image looks smooth • High frequency =frequent changes – 59124455703710 – Image looks rough • Programs that enhance or suppress frequency are called filters
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High and Low Pass Filters • Low Pass filters – Smoothers – Suppress details • High Pass filters – Edge detectors – Enhance high frequency information • Filters are a moving window
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Moving Window Concept • A filter is a moving window that operates on the raster grid – 3 by 3 window, can be any size – Mean 3 x 3 filter
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This note was uploaded on 12/21/2010 for the course GIS 4037c taught by Professor Roberts during the Spring '10 term at FAU.

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6filteringPowerpnts - Unit 4 Spatial Filtering Contrast...

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