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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