Signals Preprocessing Contrast

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Signals contrast enhancement 2. Signals edge detection

Transcript of Signals Preprocessing Contrast

  • 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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