Image processing in Spectral Domain Optical Coherence Tomography (SD-OCT)
All optical image processing with the 4 f system
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Transcript of All optical image processing with the 4 f system
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All Optical Image Processing with the 4-f system
Kieran Metcalf BSc Ex
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4-f Optical System
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Equipment Set Up
f f f f
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What is Spatial Frequency?
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Representing the Fourier Components in Frequency Space
Space
Inte
nsi
ty
Space
Inte
nsi
ty
Space
Inte
nsi
ty
Frequency
Inte
nsity
Space
Inte
nsi
ty
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The spatial frequency plot is THE SAME as the image formed between the two lenses
f f f f
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35mm Slide
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The Physical Laws of the Diffraction Grating
sina
nm8.632
0
20
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60
80
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1 2 3 4 5 6 7 8 9 10
Line Seperation / mm
An
gle
/ a
rcs
ec
s
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How the Image information is stored in the Fourier Transform
Spatial Frequency
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How the Image information is stored in the Fourier Transform
Multiple Frequencies
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How the Image information is stored in the Fourier Transform
Orientation
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Filtering Out the Frequencies
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References
• http://enteos2.area.trieste.it/russo/LabInfoMM2005-2006/ProgrammaEMaterialeDidattico/daStudiare/009-FourierInSpace.html
• http://www.physics.uq.edu.au/people/mcintyre/applets/grating/grating.html
• Eugene Hecht OPTICS Fourth Edition 13.2 Imagery – The Spatial Distribution of Optical Information
• http://enteos2.area.trieste.it/russo/LabInfoMM2005-2006/ProgrammaEMaterialeDidattico/daStudiare/009-FourierInSpace.html
• http://www.physics.uq.edu.au/people/mcintyre/applets/grating/grating.html
• Eugene Hecht OPTICS Fourth Edition 13.2 Imagery – The Spatial Distribution of Optical Information