You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: gaborconvolve.m
    path of file: ./repos/Image-Harmonization-Dataset-iHarmony4/Lalonde and Efros/utils/3rd_party/pkovesi/PhaseCongruency
    
    the code of the file until where you have to start completion: % GABORCONVOLVE - function for convolving image with log-Gabor filters
%
% Usage: [EO, BP] = gaborconvolve(im,  nscale, norient, minWaveLength, mult, ...
%			    sigmaOnf, Lnorm, feedback)
%
% Arguments:
% The convolutions are done via the FFT.  Many of the parameters relate 
% to the specification of the filters in the frequency plane.  
%
%   Variable       Suggested   Description
%   name           value
%  ----------------------------------------------------------
%    im                        Image to be convolved.
%    nscale          = 4;      Number of wavelet scales.
%    norient         = 6;      Number of filter orientations.
%    minWaveLength   = 3;      Wavelength of smallest scale filter.
%    mult            = 2;      Scaling factor between successive filters.
%    sigmaOnf        = 0.65;   Ratio of the standard deviation of the
%                              Gaussian describing the log Gabor filter's
%                              transfer function in the frequency domain
%                              to the filter center frequency. 
%    Lnorm            0        Optional integer indicating what norm the
%                              filters should be normalized to.  A value of 1
%                              will produce filters with the same L1 norm, 2
%                              will pr
    
function is used to determine angular distance.
        ds = sintheta * cos(angl) - costheta * sin(angl);     % Difference in sine.
        dc = costheta * cos(angl) + sintheta * sin(angl);     % Difference in cosine.
        dtheta = abs(atan2(ds,dc));                           % Absolute angular distance.

        % Scale dtheta so that cosine spread function has the right wavelength and clamp to pi    
        dtheta = min(dtheta*norient/2,pi);
        
        % The spread function is cos(dtheta) between -pi and pi.  We add 1,
        % and then divide by 2 so that the value ranges 0-1
        spread = (cos(dtheta)+1)/2;        


% Old angular spread function        
%        dThetaOnSigma = 1.2;
%        thetaSigma = pi/norient/dThetaOnSigma;  % Calculate the standard deviation of the
%                                                % angular Gaussian function used to
%                                                % construct filters in the freq. plane.
%
%        spread = exp((-dtheta.^2) / (2 * thetaSigma^2));  % Calculate the
%                                                          % angular filter component.        
        
        
        
        for s = 1:nscale,                    % For each scale.
            filter = logGabor{s} .* spread;  % Multiply by the angular spread to get the filter

            if Lnorm == 2      % Normalize filters to have the same L2 norm ** why sqrt 2 **????
                L = sqrt(sum(real(filter(:)).^2 + imag(filter(:)).^2 ))/sqrt(2);
            elseif Lnorm == 1  % Normalize to have same L1
                L = sum(sum(abs(real(ifft2(filter)))));
            elseif Lnorm == 0   % No normalization
                L = 1;                
            end