EIE4512 Mid-term Review

Week 1 bits and intensity

  • spatial resolution
  • interpolation

Week 2 Contrast Stretching

  • gamma (choose a filter for image)
  • histogram (pseudo code and api)
  • contrast
  • dynamic range (num of distinct intensity of an image)
  • cumulated histogram (from dynamic range) equalization
  • given different cumulated histogram, choose the curve of equalization

Week 3 Histogram Matching

  • how to match a histogram
  • linear spatial filter (correlation and convolution)
  • under what condition correlation and convolution are the same?
  • smoothing (lowpass: gaussian, average, medium…) and sharping (highpass, high boost, )

Week 4 Fourier Transformation / IFT

  • impulse train
  • sampling theorem (the frequency of sampling should be two times of …)
  • DFT / IDFT (given one function to calculate the DFT/IDFT)
  • no matter IDFT and IFT will result in complex, spectrum, log, magnitude/phase angle
  • translation insensitive, rotation sensitive
  • filters (ideal lowpass, Butterworth, gaussian, corresponding highpass filters)

Week 5 Image Restoration

  • degradation model, the formula of additive noise
  • noise distribution
  • mean filter (contra-harmonic, salt and pepper)
  • for example given a salt noise, how to define a contra-harmonic filter
  • alpha-trim filter, when will become mean filter
  • adaptive filter (local, three situation and different situation)
  • given example of local variance and global, which filter should you choose
  • adaptive medium filter
  • bilateral

Week 6 Edge Detection

  • smooth (why should we do smoothing)
  • trade off between localization and detection
  • Hague transformation
  • line detection
  • interest point (which is a good interest point)
  • why we are so interest in the corner detection
  • harris corner detection (familiar with the whole process:loss function/ structure tensor identify what it is)

Week 7 Brightness Consistency Equation

  • brightness consistency equation
  • Lucas – Kanade
  • interactive refinement
    • coarse-to-fine optical flow