Density Slicing of Thermal IR Band Original left vs Contrast Stretch Principle of Contrast Stretch Enhancement Histogram No Stretch Image Values Display Levels 0 60 160 60 255 255 110 ID: 555889
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Slide1
Radiometric Preprocessing Slide2
Density Slicing of Thermal IR BandSlide3
Original (left) vs.
Contrast StretchSlide4
Principle of Contrast Stretch Enhancement
Histogram
No Stretch
Image Values
Display Levels
0
60
160
60
255
255
110
160
110
0
Linear Stretch
60
110
160
255
0
127
255
0
Image Values
Display Levels
No. PixelsSlide5
Additional Stretches
Histogram Stretch
60
110
160
255
0
127
255
0
Image
Values
Display Levels
Special Stretch
60
90
255
0
127
255
0
Image Values
Display Levels
Linear, nonlinear, piecewise stretches, histogram matchingSlide6
Image with no enhancementSlide7
Image with Contrast StretchSlide8
IR / Red Ratio 432 Composite NDVISlide9
Principal Components Transformation
Scatter plot showing correlation between bandsPrincipal components transform is used to generate a new coordinate system (Y
1, Y
2
)
Y
1
Y
2
Band 1 DN
Band 2 DNSlide10
Principal Components, 1 and 2Slide11
Principal Components, 3 and 6Slide12
Composite Image of Principal Components 3, 2, 1Slide13
Tasseled Cap Transformation
Transforms spectral space into three “structure axes”
BrightnessGreennessWetness
(TM allowed Haze, Fifth, Sixth)
Must be customized for each sensor