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. 2020 Nov 30;22(12):1361. doi: 10.3390/e22121361
Algorithm 3 The pseudo code of the Bank of Rotations Based on FFT (BRBFFT) method
  •   1:

    Input: Biometric image I(i,j).

  •   2:

    Output: Distorted image IS(i,j).

  •   3:

    Step 1. A pre-processing adjustment is performed on each biometric image.

  •   4:

    Step 2. Apply the DFT/DFrFT transformation to produce the frequency representation of the template using Equations (1) or (2).

  •   5:

    Step 3. Image rotation is applied with different angles θn for the DCT coefficients, while the total rotated image is computed by Equation (11).

  •   6:

    Step 4. Bio-convolution is applied.

  •   7:

    Step 5. Construction of the deformed biometric template is implemented by employing the inverse DFT/DFrFT.