[Exercises]
[Workspace]
Purpose:
The purpose of this lab is to visualize and interpret the
2D magnitude spectra of a wavelet analysis performed on an image.
Activities:
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Read the image $DIP/data/gull.kdf, display it, take a
one-level forward wavelet transform, determine its spectrum, and
display the results. Use the operators User defined, Display Image
, FFT, and Wavelet Transform. Use the file $DIP/data/daub2hd.ascii
as the "Highpass Filter Coefficient" file,
and $DIP/data/daub2ld.ascii as the "Lowpass Filter Coefficient"
file.
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Glyphs:Input/Output:Data Files:User defined
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Glyphs:Wavelet:Linear Transforms:Wavelet Transform
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Glyphs:Arithmetic:Linear Transforms:FFT
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Glyphs:Visualization:Non-Interactive Display:Display Image
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Extract the four quadrants of the wavelet transform, find the
spectrum of each individually, and display the results. Use the
operators Extract, FFT, and Display Image.
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Glyphs:Data Manip:Size & Region Operators:Extract
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Glyphs:Arithmetic:Linear Transforms:FFT
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Glyphs:Visualization:Non-Interactive Display:Display Image
-
Interpret the resultant spectra.
Exercises
-
Perform the same experiment, but with different images.
Khoros Workspace
Execute the visual program c8s3W-freq-decomposition.wk
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