1 Description
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Advanced parameter settings for the WIPE method      K. Bouyoucef 29-March-1998
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Advanced parameter settings panel for the the WIPE image reconstruction method. 
Most of the time, you do not want to change any of these parameters.



Active Buttons:
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GO          To update the current settings.

DISMISS     To close this panel without changing a thing.

HELP        To display the information you are reading now.


Inputs:
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2 WIPE_ETA
"space bandwidth parameter"
        This constant (usually noted with the greek letter 'eta') characterises
        the amount of interpolation to perform in both the sky and the uv space
        at the same time.

2 WIPE_OVERS
"Workspace oversampling" 
        Integer greater or equal to 2 involved in the definition of the virtual
        Fourier sampling interval. It results in the oversampling of the Object
        Workspace. 

2 WIPE_EPS
"Relative accuracy to achieve in the Power Method"
        Relative accuracy to reach in the Power Method, used for the Neat Beam
        determination. 

2 WIPE_NPM
"Maximum number of iterations of the power method"
        Maximum number of Power Method iterations to perform.
        If we reach this maximum number, it could be that the method did not
        converge within the required WIPE_EPS accuracy.

2 WIPE_THRESH
"Threshold"   
        Threshold corresponding to the fraction of the Maximum of the Neat Beam
        above which we compute the Fourier Transform of the Neat Beam on the 
        experimental spatial frequency list.
        

2 WIPE_DYNAMIC
"Maximal dynamic for the weight function"
        Maximal dynamic allowed for the weight function. 
        Given the lowest weight, wmin, the upper maximum weight will be 
        thresholded to wmin*WIPE_DYNAMIC. 
        
2 WIPE_KRY
"Maximum dimension of the Krylov space"
        Maximum dimension of the Krylov space that corresponds to the maximum
        number of eigenvalues and eigenmodes that will be computed of the
        WIPE imaging operator.
	
2 WIPE_MNWI
"Maximum number of WIPE iterations"
        Maximum number of allowed WIPE iterations.

2 WIPE_MNCI
"Maximum number of CLEAN iterations"
        Maximum number of allowed CLEAN iterations.

2 WIPE_MNCG
"Maximum number of Conjugate Gradients iterations"
        Maximum number of allowed Conjugate Gradients iterations. 
        This is the maximum number of iterations of the minimizations algorithm
        used to solve the reconstruction problem, given an object representation
        space.

2 WIPE_MNPOS
"Maximum number of positivity constraint loops"
        Maximum number of allowed positivity contraint method iterations.
        In this specific implementation of WIPE we assume that all values of the
        reconstructed image must be positive. Therefore, if at one point of the 
        reconstruction procedure the positivity constraint is not ensured we try
        to achieve it using a positivity by block conjugate gradients method.

2 WIPE_EPSPOS
"Accuracy to reach in positivity constraint loop"
        Accuracy to reach during the positivity constraint by block method.
        The aim is to ensure the positivity of each pixel for the final
        reconstructed image.

2 WIPE_TRSE
"Threshold on Residu for Support Expansion"
        Threshold on the residu for WIPE support expansion during the construction
        of the image representation space (image support).

2 WIPE_PMU
"Relative accuracy to reach on eigenvalue computation"
        Value of the relative variation for the test of convergence during the 
        computation of the eigenvalues associated to the condition number.

2 WIPE_PPHI
"Relative accuracy to reach on solution computation"
        Value of the relative variation for the test of convergence during the 
        computation of the reconstructed image, phi.

2 WIPE_LMNB 
"Lower margin threshold on Neat Beam"
        Lower margin threshold of the Neat Beam to define its support.

2 WIPE_UMNB
"Upper margin threshold on Neat Beam"
        Upper margin threshold of the Neat Beam to define its interior. This
        threshold is used the smoothing of the support (at the end of the
        construction of the object representation space).

1 END