Download - Signals Preprocessing Contrast
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Signals Preprocessing
1. Signals contrast enhancement 2. Signals edge detection
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SIGNALS CONTRAST ENHANCEMENT Introduction1. Amplitude re scaling2. Power low point contrast modification3. Gaussian contrast modification4. Logarithmic contrast modification5. Reverse contrast modification6. Inverse contrast modification7. Histogram modificationConclusionHome work Literature
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Definition of the contrastF(j,k) input signalj=1J, k=1K
max{F(j,k)}CRT = _______________ min{F(j,k)
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2D signals
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2D signals
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Operation of signals contrast enhancement
F(j,k)f{F(j,k)}= G(j,k)
CRTG > CRTF
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Amplitude re scaling
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Amplitude re scaling
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Amplitude re scaling
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Amplitude re scaling
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Power low point contrast modification
G(j,k)=[F(j,k)]t0
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Power low point contrast modification
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Power low point contrast modification
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Power low point contrast modification
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Power low point contrast modification
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Power low point contrast modification
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Gaussian contrast modification
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Logarithmic contrast modification
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Reverse contrast modification
G(j,k)=1-F(j,k)
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Reverse contrast modification
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Inverse contrast modification
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Inverse contrast modification
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Histogram modification
Histogram the function which describe the nr of signals elements of different intensity
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Histogram modification
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Histogram modification
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Histogram modification
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Histogram modification
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Histogram modification
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Histogram modification
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Histogram modification
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Conclusion
1. Amplitude re scaling2. Power low point contrast modification3. Gaussian contrast modification4. Logarithmic contrast modification5. Reverse contrast modification6. Inverse contrast modification7. Histogram modification
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Home work1. To compare different methods2. To elaborate the algorithms for signals contrast enhancement by:- Amplitude re scaling - Gaussian contrast modification- Histogram modification
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Literature
S. V. Vaseghi. Advanced Digital Signal Processing and Noise Reduction. John Willy&Sons, Ltd, 2002. http://dsp-book.narod.ru/adsnr.htm
S.M. Kuo, B.H. Lee. Real Time Digital Signal Processing. John Wiley&Sons, Ltd, 2001.
William K. Pratt. Digital Image Processing. John Wiley&Sons, Ltd, 2001.
. . .:, 2006
Optical Engineering Journal
www.spie.org
www.elsevier.com
www.ieee.com