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Content
● Spatial domain vs Frequency domain● Fourier Transform● Analysis of hybrid image● Conclusion● Reference
Spatial Domain vs Frequency Domain
Spatial Domain● manipulating image in order to enhance it● direct manipulation of pixels in image
Frequency Domain● based on modifying the spectral transform of an
image● Transform the image to its frequency
representation
Fourier Transform
● transform image from spatial domain into frequency domain
● used to analyze phase & magnitude of image frequency spectrum
● image filtering can be done with simple multiplication
Conclusion
● Fourier transform is a good tool to analyze image frequency
● FFT is an algorithm to compute discrete fourier transform
References
http://www.ee.columbia.edu/~xlx/ee4830/notes/lec4.pdfhttp://faraday.ee.emu.edu.tr/ee583/Lectures/EE%20583-Lecture04.pdf