Electronic speckle interference fringe pattern phase information extracting method

Electronic speckle interference fringe pattern phase information extracting method

  • CN 104,268,837 B
  • Filed: 09/26/2014
  • Issued: 08/21/2018
  • Est. Priority Date: 09/26/2014
  • Status: Active Grant
First Claim
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1. electronic speckle interference fringe pattern phase information extracting method, using laser interference and image processing equipment as test platform,It is characterized in that, extracting phase information using partial differential equation, include the following steps:

  • Step 1:

    A width electronic speckle interference fringe pattern is inputted in image processing equipment as I;

    Step 2:

    Extract the skeleton line of the stripe pattern;

    Step 3:

    Human-computer interaction carries out series calibration to skeleton line:

    First set a certain fringe order n, the maximum difference of adjacent stripesSeries is ±

    1, is -1 to peak valley direction wherein being+1 to summit direction;

    The fringe order set is multiplied by π

    , recovers bonePhase value on stringing, using the result figure after the phase value recovered on skeleton as the input picture u before phase-interpolation;

    Step 4:

    Assuming that the size of image u is M ×

    N, ui,jFor the gray value at (i, j) point, wherein 1≤

    i≤

    M, 1≤

    j≤

    N;

    Time step is Δ

    t, iterations n, in the evolutionary process of equation, tnEvolution maps u (i, j, the n Δ

    s of=n time Δ

    tsT) it is expressed asIt is calculated with a forward difference, i.e.,Construct the difference of heat transfer diffusion equationFormat is:

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