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function [annotation, img] = LMimscale(annotation, img, scaling, method)
%
% Scales one image (as in imresize) and the associated annotation.
% The scale factor is given by 'scaling'.
%
% When scaling<1, the image is downsampled.
%
% [annotation, img] = LMimscale(annotation, img, scaling);
%
% Also, the scaling can be given in absolute coordinates:
%
% [annotation, img] = LMimscale(annotation, img, [NROWS NCOLS]);
% Store the original numerical format of the image and turn it into 'double'.
imgtype = whos('img');
img = single(img);
if nargin < 4
method = 'nearest';
end
if length(scaling) > 1
scalingx = scaling(2)/size(img,2);
scalingy = scaling(1)/size(img,1);
else
scalingx = scaling;
scalingy = scaling;
end
if scaling ~= 1
if nargout > 1
% Image resampling:
img = imresizefast(img, scaling, method);
end
% Change the size of the polygon coordinates
if isfield(annotation, 'object')
Nobjects = length(annotation.object); n=0;
for i = 1:Nobjects
[x,y] = getLMpolygon(annotation.object(i).polygon);
x = round(x*scalingx);
y = round(y*scalingy);
annotation.object(i).polygon = setLMpolygon(x,y);
% Npoints = length(annotation.object(i).polygon.pt);
% for j = 1:Npoints
% % Scale each point:
% x=str2num(annotation.object(i).polygon.pt(j).x);
% y=str2num(annotation.object(i).polygon.pt(j).y);
%
% x = round(x*scalingx);
% y = round(y*scalingy);
%
% annotation.object(i).polygon.pt(j).x = num2str(x);
% annotation.object(i).polygon.pt(j).y = num2str(y);
% end
end
end
end
% add/modify image size field
annotation.imagesize.nrows = size(img,1);
annotation.imagesize.ncols = size(img,2);
if nargout > 1
% return the image in its original numeric format
img = feval(imgtype.class, img);
end
function img = imresizefast(img, scaling, method, init);
if nargin<4
init = 0;
end
if scaling > .5
img = imresize(img, scaling, method);
else
c = size(img,3);
for n = 1:c
img(:,:,n) = conv2(img(:,:,n), [1 2 1; 2 4 2; 1 2 1]/16, 'same');
end
img = img(init+1:2:end, init+1:2:end, :);
%img = convn(img, [1 2 1]/4, 'same');
%img = img(:,init+1:2:end,:);
img = imresizefast(img, 2*scaling, method, 1-init);
end
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