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Image Processing
- 1. HOMOMORPHIC FILTERING INIMAGE PROCESSING AND ITSAPPLICATIONS
- 2. Image processing inhumans
- 4. Image processing incomputer
- 7. WHAT IS IMAGEPROCESSING?Image processing is a form of signal processing for which the input is an image, such as photographs or frames of videos and the output can either be an image or a set of characteristics or parameters related to the image.
- 8. Principle:HomomorphicFiltering:Homomorphic filtering isa generalized technique for image enhancement and/or correction.It simultaneously normalizes the brightness across an image and increases contrast
- 9. An image canbe expressed as the product of illumination and reflectance: f(x,y,z)=i(x,y,z).r(x,y,z) => g(x,y,z)=ln(f(x,y,z)) => g(x,y,z)=ln(i(x,y,z))+ln(r(x,y,z))
- 10. Then taking DFT: F(g(x,y,z))=F(ln(i(x,y,z)))+F(ln(r(x,y,z)))Then we will apply it to a filter. we will get F(s(x,y,z)) as o/p Then inverse DFT(IDFT) of filter output is taken. we will get, s(x,y,z)=I'(x,y,z)+r’(x,y,z)Then we will take exponential to get enhanched image s’(x,y,z)=I‘’(x,y,z).r’’(x,y,z)
- 11. I‘’(x,y,z), r’’(x,y,z) arethe illumination and reflectance of the ‘’enhanced'' image. The illumination component tends to vary slowly across the image. The reflectance tends to vary rapidly. Therefore, by applying a frequency domain filter we can reduce intensity variation across the image while highlighting detail.
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- 13. Filtering in theFrequency Domain :Lowpass FilterHighpass Filter
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- 15. Image re-touching, Cleaning& Cloning
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- 19. Removing objects, backgrounds,persons etc.