Analysis of hybrid image with FFT

Aung Thu Rha Hein (g5536871)

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

Fourier Transform/2

Original image

Gaussian blur with sigma value of 3

Analysis of hybrid image

Low pass filter image

high pass filter image

Analysis of hybrid image/2

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