Digital Image Processing, 2nd ed. www.imageprocessingbook.com © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter.

Slides:



Advertisements
Similar presentations
Digital Image Processing, 3rd ed. © 1992–2008 R. C. Gonzalez & R. E. Woods Gonzalez & Woods Chapter 11 Representation and.
Advertisements

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 5 Image Restoration Chapter 5 Image Restoration.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 9 Morphological Image Processing Chapter 9 Morphological.
© 2010 Gatesmark, LLC Digital Image Processing Using MATLAB ® 2nd edition Gonzalez, Woods, & Eddins Chapter 11 Representation.
Chapter 4 Image Enhancement in the Frequency Domain.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 1: Introduction.
© 2010 Gatesmark, LLC Digital Image Processing Using MATLAB ® 2nd edition Gonzalez, Woods, & Eddins Chapter 8 Image Compression.
CHAPTER 4 Image Enhancement in Frequency Domain
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 11 Representation & Description Chapter 11 Representation.
© 2010 Gatesmark, LLC Digital Image Processing Using MATLAB ® 2nd edition Gonzalez, Woods, & Eddins Chapter 3 Filtering in.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 7 Wavelets and Multiresolution Processing Chapter.
© 2010 Gatesmark, LLC Digital Image Processing Using MATLAB ® 2nd edition Gonzalez, Woods, & Eddins Chapter 4 Image Restoration.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter.
© 2010 Gatesmark, LLC Digital Image Processing Using MATLAB ® 2nd edition Gonzalez, Woods, & Eddins Chapter 10 Image Segmentation.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 5 Image Restoration Chapter 5 Image Restoration.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 12 Object Recognition Chapter 12 Object Recognition.
Frequency domain Image Processing Comp344 Tutorial Kai Zhang.
© 2010 Gatesmark, LLC Digital Image Processing Using MATLAB ® 2nd edition Gonzalez, Woods, & Eddins Chapter 9 Morphological.
© 2010 Gatesmark, LLC Digital Image Processing Using MATLAB ® 2nd edition Gonzalez, Woods, & Eddins Chapter 6 Color Image.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 3 Image Enhancement in the Spatial Domain Chapter.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 3 Image Enhancement in the Spatial Domain Chapter.
© 2010 Gatesmark, LLC Digital Image Processing Using MATLAB ® 2nd edition Gonzalez, Woods, & Eddins Chapter 7 Wavelets.
© 2010 Gatesmark, LLC Digital Image Processing Using MATLAB ® 2nd edition Gonzalez, Woods, & Eddins Chapter 5 Geometric Transformations.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 10 Image Segmentation Chapter 10 Image Segmentation.
Chapter 4 Image Enhancement in the Frequency Domain.
© 2010 Gatesmark, LLC Digital Image Processing Using MATLAB ® 2nd edition Gonzalez, Woods, & Eddins Chapter 1 Introduction.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 2: Digital Image Fundamentals.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 3 Image Enhancement in the Spatial Domain Chapter.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 5 Image Restoration Chapter 5 Image Restoration.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 9 Morphological Image Processing Chapter 9 Morphological.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 8 Image Compression Chapter 8 Image Compression.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 6 Color Image Processing Chapter 6 Color Image.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 2: Digital Image Fundamentals.
Image Processing © 2002 R. C. Gonzalez & R. E. Woods Lecture 4 Image Enhancement in the Frequency Domain Lecture 4 Image Enhancement.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 8 – Image Compression.
Digital Image Processing Chapter 4 Image Enhancement in the Frequency Domain Part I.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Background Any function that periodically repeats itself.
Digital Image Processing, 3rd ed. © 1992–2008 R. C. Gonzalez & R. E. Woods Gonzalez & Woods Chapter 12 Object Recognition.
Digital Image Processing, 3rd ed. © 1992–2008 R. C. Gonzalez & R. E. Woods Gonzalez & Woods Chapter 9 Morphological Image.
Digital Image Processing, 3rd ed. © 1992–2008 R. C. Gonzalez & R. E. Woods Gonzalez & Woods Chapter 7 Wavelets and Multiresolution.
Digital Image Processing, 3rd ed. © 1992–2008 R. C. Gonzalez & R. E. Woods Gonzalez & Woods Chapter 1 Introduction Chapter.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Image Processing Example.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Image Processing Example.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 1: Introduction -Produced by Bartlane cable picture.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 1: Introduction Digital Imaging Chapter 1: Introduction.
Digital Image Processing Chapter 4: Image Enhancement in the Frequency Domain 22 June 2005 Digital Image Processing Chapter 4: Image Enhancement in the.
Gholamreza Anbarjafari, PhD Video Lecturers on Digital Image Processing Digital Image Processing Spatial Aliasing and Image Enhancement.
Lecture Nine Figures from Gonzalez and Woods, Digital Image Processing, Copyright 2002.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter.
Frequency Domain Processing Lecture: 3. In image processing, linear systems are at the heart of many filtering operations, and they provide the basis.
University of Ioannina - Department of Computer Science Filtering in the Frequency Domain (Application) Digital Image Processing Christophoros Nikou
Chapter 4 Image Enhancement in the Frequency Domain.
Digital Image Processing, 3rd ed. © 1992–2008 R. C. Gonzalez & R. E. Woods Gonzalez & Woods Chapter 2 Digital Image Fundamentals.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 5 Image Restoration Chapter 5 Image Restoration.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods.
Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 3 Image Enhancement in the Spatial Domain Chapter.
Lecture Seven Figures from Gonzales and Woods, Digital Image Processing, Copyright 2002.
Digital Image Processing, 3rd ed. © 1992–2008 R. C. Gonzalez & R. E. Woods Gonzalez & Woods Chapter 5 Image Restoration and.
Digital Image Processing Lecture 8: Image Enhancement in Frequency Domain II Naveed Ejaz.
Digital Image Processing , 2008
IMAGE PROCESSING FREQUENCY DOMAIN PROCESSING
Frequency Domain Processing
Image Enhancement in the
Lecture Five Figures from Gonzalez and Woods, Digital Image Processing, Second edition, Prentice-Hall,2002.
Chapter 2: Digital Image Fundamentals
Image Enhancement in the
Chapter 2: Digital Image Fundamentals
Lecture 16 Figures from Gonzalez and Woods, Digital Image Processing, Second Edition, 2002.
Frequency Domain Processing
Presentation transcript:

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods DFT in Matlab Compute DFT: >> f = imread(’center_bump.tif’); >> F = fft2(f); >> S = abs(F); >>imshow(S,[])

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Centering DFT >> Fc=fftshift(F); >> imshow(abs(Fc),[])

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Sharpening by Log Transform >> S2=log(1+abs(Fc)); >> imshow(S2,[])

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods From DFT back to signal >> F=ifftshift(Fc); >> f=ifft2(F); >> f=real(ifft2(F));

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Basic Frequency Filtering >> f=imread(’square_original.tif’); >> [M,N]=size(f); >> F=fft2(f); >> sig=10; >> H=lpfilter(’gaussian’,M,N,sig); >> G=H.*F; >> g=real(ifft2(G)); >> imshow(g,[])

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Frequency Domain (the need for padding) Chapter 4 Frequency Domain (the need for padding)

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Frequency Domain (the need for padding) Chapter 4 Frequency Domain (the need for padding)

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Frequency Domain (why padding) Chapter 4 Frequency Domain (why padding)

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Frequency Domain Processing Chapter 4 Frequency Domain Processing

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Frequency Domain Processing Chapter 4 Frequency Domain Processing

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Frequency Domain Processing Chapter 4 Frequency Domain Processing

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Frequency Domain Processing Chapter 4 Frequency Domain Processing

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Padding in Practice Assume images f(x,y) & h(x,y) of sizes A × B and C × D Form two padded functions of size P × Q by appending zeros to f and g. You can show that wraparound error is avoided by choosing P  A + C − 1 and Y  B + D − 1 For special case of f(x,y) & h(x,y) of the same size, M × N, we pad with P  2M − 1 and Q  2N − 1

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Padding in Practice >> PQ=paddedsize(size(f)); %Compute the FFT with padding. >> Fp=fft2(f,PQ(1),PQ(2)); >> Hp=lpfilter(’gaussian’,PQ(1),PQ( 2),2*sig); >> Gp=Hp.*Fp; >> gp=real(ifft2(Gp)); >> gpc=gp(1:size(f,1),1:size(f,2)); >> imshow(gp,[]) >> imshow(gpc,[])

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Digital Image Processing, 2nd ed. © 2002 R. C. Gonzalez & R. E. Woods Chapter 4 Image Enhancement in the Frequency Domain Chapter 4 Image Enhancement in the Frequency Domain

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2024 SlidePlayer.com Inc. All rights reserved.