DOWNSCALEXY - Image downsampling. NOT IMPLEMENTED YET.

Contents

Description

Downsample monotically the input matrix by keeping every n-th sample in both directions starting with the first.

Syntax

   downI = DOWNSCALEXY(I);
   downI = DOWNSCALEXY(I, [sx sy]);

Inputs

I : 2D or 3D input matrix with size (X,Y,Z) to be downsampled in X- (vertical) and Y- (horizontal) directions.

sx, sy : size (dividing factor) of the downsampling in X- and Y- directions; default: sx=sy=2.

sy : ibid in ; default: sy=sx.

Outputs

downI : the downsampled matrix with size (X/sx,Y/sy,Z).

See also

Ressembles: UPSCALEXY, DOWNSAMPLE.

Function implementation

function downI = downscalexy(I,varargin)                               %#ok

error('downscalexy:methoderror', 'method not yet implemented');

parsing parameters

error(nargchk(1, 2, nargin, 'struct'));
error(nargoutchk(1, 1, nargout, 'struct'));

if ~isnumeric(I)
    error('downscalexy:errorinput','a matrix is required in input');
end

% optional parameters
p = createParser('DOWNSCALEXY');   % create an instance of the inputParser class.
p.addOptional('S', [2 2 1], @(x)isnumeric(x) && all(x>=1) && length(x)<=2);
% parse and validate all input arguments
p.parse(varargin{:});
p = getvarParser(p);

internal variables

downscaling

end % end of downscalexy