what is actually wavelet coefficient

Dear all, I have some question regarding wavelet coefficients.
1. What is the purpose of wavelet coefficients?
2. Can we specify by our own the threshold value of wavelet coefficient.
3. What is the coding to generate/list the wavelet coefficient of an image.
TQ in advance.. may God bless u all..

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Nik
le 24 Août 2014

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