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Image Analysis - irsm.cas.cz · discrimination ot image lacks some topographic detail and ustng 'SH...
Transcript of Image Analysis - irsm.cas.cz · discrimination ot image lacks some topographic detail and ustng 'SH...
Image Analysis
Karel Martínek
Image analysis
visual interpretation
digital processingpreprocessing (radiometric and geometric
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preprocessing (radiometric and geometriccorrections, ...)
image enhancement (contrast manipulation, spatial filtering, ...)
image transformation (band ratios, principal component analysis, ...)
classification (unsupervised, supervised)
images
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preprocessing
mosaicking
destripe
replace bad lines
radiometric corrections
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replace bad lines
atmospheric corrections
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Rectification (geometric correction, geometric
registration, georeferencing)
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spectral band combination
TM 321 RGB
TM 432 RGB
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TM 531 RGB
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TM 753 RGB
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contrast enhancement
histogram stretch
linear
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histogram equalize
histogram
TM1
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TM1
TM4
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TM1 water features, masked land
spatial filtering- kernels
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low-pass filter
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high-pass/sharpen filter
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image transformation
algebraic operations with spectral bands
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principal component analysis
band ratios
R
G
B
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TM 5/4 3/1 5/7 as RGB HSI transformation
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TM vegetation index
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Red
Magenta
Yellow
Green
RGB color system
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Green
Blue
Cyan
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principal component analysis (PCA)
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PCA
PC1, PC2, PC3
as RGB
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