estima_lambda

PURPOSE ^

function lamb=estima_lambda(Imobservada,B,lambdas,M,F,Nbloques);

SYNOPSIS ^

function lamb=estima_lambda(Imobservada,B,lambdas,M,N,F,Nbloques);

DESCRIPTION ^

 function lamb=estima_lambda(Imobservada,B,lambdas,M,F,Nbloques);


   Given an observed degraded image (given by 'K' and additive noise)
   , it regularizes using the a penalization operator F and reguilarization parameter
   'lambdas'.
   N is the block size and M is the block size plus the boundary
   (in order to avoid boundary effects in the reconstruction.
   It gives back also the image blocks in order to perform the overlapping.

   i.e.

      N=16;
      M=44;
      Nlambdas=70;
      lambdas=logspace(-2,2,Nlambdas);
      operador=fft2(filt2dsegder,M,M);

      figure,lamb=estima_lambda(BlurredNoisy,PSF,lambdas,M,operador,Nbloques);

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 % function lamb=estima_lambda(Imobservada,B,lambdas,M,F,Nbloques);
0002 %
0003 %
0004 %   Given an observed degraded image (given by 'K' and additive noise)
0005 %   , it regularizes using the a penalization operator F and reguilarization parameter
0006 %   'lambdas'.
0007 %   N is the block size and M is the block size plus the boundary
0008 %   (in order to avoid boundary effects in the reconstruction.
0009 %   It gives back also the image blocks in order to perform the overlapping.
0010 %
0011 %   i.e.
0012 %
0013 %      N=16;
0014 %      M=44;
0015 %      Nlambdas=70;
0016 %      lambdas=logspace(-2,2,Nlambdas);
0017 %      operador=fft2(filt2dsegder,M,M);
0018 %
0019 %      figure,lamb=estima_lambda(BlurredNoisy,PSF,lambdas,M,operador,Nbloques);
0020 %
0021 
0022 function lamb=estima_lambda(Imobservada,B,lambdas,M,N,F,Nbloques);
0023 
0024 [fil,col]=size(Imobservada);
0025 
0026 a=(M-N)/2;
0027 
0028 Im2=ampliaconborde(Imobservada,a);
0029 
0030 filas = round(N/2 + rand(Nbloques,1)*(fil-N));
0031 columnas = round(N/2 + rand(Nbloques,1)*(col-N));
0032 
0033 filas,columnas
0034 
0035 lamb = 0;
0036 
0037 for i=1:Nbloques
0038 
0039       observado=Im2(filas(i)+a-M/2+1:filas(i)+a+M/2,columnas(i)+a-M/2+1:columnas(i)+a+M/2);
0040 
0041       [sol,lambda]=restaura_block(observado,B,F,M,N,lambdas,2);
0042 
0043       lamb = lamb + lambda;
0044 
0045 end
0046 
0047 lamb = lamb / Nbloques;
0048 
0049

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