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imremap

PURPOSE ^

% Applies any geometric transformation to the image @var{im}.

SYNOPSIS ^

function [warped, valid] = imremap(im, XI, YI, interp = 'bilinear', extrapval = NA)

DESCRIPTION ^

% -*- texinfo -*-
% @deftypefn {Function File} @var{warped} = imremap(@var{im}, @var{XI}, @var{YI})
% @deftypefnx{Function File} @var{warped} = imremap(@var{im}, @var{XI}, @var{YI}, @var{interp}, @var{extrapval})
% @deftypefnx{Function File} [@var{warped}, @var{valid} ] = imremap(...)
% Applies any geometric transformation to the image @var{im}.
%
% The arguments @var{XI} and @var{YI} are lookup tables that define the resulting
% image
% @example
% @var{warped}(y,x) = @var{im}(@var{YI}(y,x), @var{XI}(y,x))
% @end example
% where @var{im} is assumed to be a continuous function, which is achieved
% by interpolation. Note that the image @var{im} is expressed in a (X, Y)-coordinate
% system and not a (row, column) system.
%
% The argument @var{interp} selects the used interpolation method, and most be one
% of the following strings
% @table @code
% @item 'nearest'
% Nearest neighbor interpolation.
% @item 'linear'
% @itemx 'bilinear'
% Bilinear interpolation. This is the default behavior.
% @item 'cubic'
% @itemx 'bicubic'
% Bicubic interpolation.
% @end table
%
% All values of the result that fall outside the original image will
% be set to @var{extrapval}. For images of class @code{double} @var{extrapval}
% defaults to @code{NA} and for other classes it defaults to 0.
%
% The optional output @var{valid} is a matrix of the same size as @var{warped}
% that contains the value 1 in pixels where @var{warped} contains an interpolated
% value, and 0 in pixels where @var{warped} contains an extrapolated value.
% @seealso{imperspectivewarp, imrotate, imresize, imshear, interp2}
% @end deftypefn

CROSS-REFERENCE INFORMATION ^

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