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problem in denoising image by using curvelet transform

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fred bnm
fred bnm 2016-11-19
编辑： Walter Roberson 2016-11-19
denoising algorithm by using Curvelet Transform:
  1. Compute all thresholds for cuvelets;
  2. Compute norm of curvelets;
  3. Apply curvelet transform to noisy image;
  4. Apply hard thresholding to the curvelet coefficients; and
  5. Apply inverse cuvrelet transform to the result of step 4.
I do not understand step 2. In your opinion, Is not more appropriate calculate norm of each curvelet coefficient after the transform image to curvelet. If there is a scientific reason for step 2, please explain. Maybe I just did not notice

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