Signals Preprocessing
1. Signals contrast enhancement 2. Signals edge detection
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
Definition of the contrastF(j,k) input signalj=1J, k=1K
max{F(j,k)}CRT = _______________ min{F(j,k)
2D signals
2D signals
Operation of signals contrast enhancement
F(j,k)f{F(j,k)}= G(j,k)
CRTG > CRTF
Amplitude re scaling
Amplitude re scaling
Amplitude re scaling
Amplitude re scaling
Power low point contrast modification
G(j,k)=[F(j,k)]t0
Power low point contrast modification
Power low point contrast modification
Power low point contrast modification
Power low point contrast modification
Power low point contrast modification
Gaussian contrast modification
Logarithmic contrast modification
Reverse contrast modification
G(j,k)=1-F(j,k)
Reverse contrast modification
Inverse contrast modification
Inverse contrast modification
Histogram modification
Histogram the function which describe the nr of signals elements of different intensity
Histogram modification
Histogram modification
Histogram modification
Histogram modification
Histogram modification
Histogram modification
Histogram modification
Conclusion
1. Amplitude re scaling2. Power low point contrast modification3. Gaussian contrast modification4. Logarithmic contrast modification5. Reverse contrast modification6. Inverse contrast modification7. Histogram modification
Home work1. To compare different methods2. To elaborate the algorithms for signals contrast enhancement by:- Amplitude re scaling - Gaussian contrast modification- Histogram modification
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
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