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Generation of Multispectral Filter Array

Generation of Multispectral Filter Array. Lidan Miao 01/22/04. Motivation. Color image (Color filter array). Sensing the wavelengths in the visible spectrum (400~700nm). Multispectral image (Multispectral filter array).

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Generation of Multispectral Filter Array

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  1. Generation of Multispectral Filter Array Lidan Miao 01/22/04

  2. Motivation • Color image (Color filter array). Sensing the wavelengths in the visible spectrum (400~700nm). • Multispectral image (Multispectral filter array). CCD sensors can detect light (NIR:700~1100nm)outside the sensitivity of HVS. Additional information can be obtained from these spectral bands.

  3. Objective • CFA and MSFA Each sensor sense one spectral band and the unmeasured spectral bands can be interpolated. • Rectangular array and Hexagonal array The hexagonal grid can model the human visual system more precisely.

  4. Design criteria of CFA • Uniform distribution • Equal sample frequency. • Color consistency. • Spectral sensitivity. Bayer color filter array

  5. MSFA in the rectangle domain

  6. Breakup algorithm • Checkboard pattern

  7. Breakup algorithm • Binary tree and MSFA

  8. Characteristics • Symmetrical and uniform distribution. • Each band has the same number of neighbors of certain spectrum and the relative position of different spectra is fixed. • The percentage of each spectrum is determined by the separation process. (a)Equal Probability (b)Unequal Probability

  9. MSFA in the hexagon domain(3 methods)

  10. Method 1 • Directly apply the algorithm in the rectangle array. “Checkboard” pattern

  11. Method 2 • Apply a new coordinate system. (a) Coordinate system

  12. Method 2 “Checkboard” pattern

  13. Method 3 • Based on the distance between the adjacent pixels. • Each pixel has 4 immediate neighbors (distance =1) and 4 secondary neighbors (distance = sqrt(2)). • For each pixel, half of its neighbors are chosen. • As we increase the distance, the percentage decreases.

  14. Method 3

  15. Limitation • Cannot generate all the filter arrays with equal probability. Rectangular array: 3, 5, 7 bands… Hexagonal array (method 3): 4, 5, 6, 7 bands… • The probability is restrict to 1/2, 1/4, 1/8,…… or 1/3, 2/3, 2/9, 1/9……

  16. Comparison • (a) has all the characteristics in the rectangle domain. • (b) is sensitive to cross talk. • (c) has the property of equal distance. (c) Method 3 (a) Method 1 (b) Method 2

  17. Which one do you like?

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