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clsm_velocimetry/gaussianWindowFilter.m
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function WINDOW = gaussianWindowFilter(DIMENSIONS, WINDOWSIZE, WINDOWTYPE) | |
% gaussianWindowFilter(DIMENSIONS, WINDOWSIZE, WINDOWTYPE) creates a 2-D | |
% gaussian window | |
% | |
% INPUTS | |
% DIMENSIONS = 2 x 1 Vector specifying the Dimensions (in rows and columns) of the gaussian window filter | |
% WINDOWSIZE = 2 x 1 vector specifying the effective window resolution of | |
% the gaussian window. WINDOWSIZE can either specify the resolution in | |
% pixels or as a fraction of the filter dimensions. This option is | |
% controlled by the input WINDOWTYPE. | |
% WINDOWTYPE = String specifying whether WINDOWSIZE specifies a | |
% resolution in pixels ('pixels') or as a fraction of the window | |
% dimensions ('fraction'). | |
% | |
% OUTPUTS | |
% WINDOW = 2-D gaussian window | |
% | |
% SEE ALSO | |
% findwidth | |
% Default to an absolute size window type | |
if nargin < 3 | |
WINDOWTYPE = 'fraction'; | |
end | |
% Signal height and width | |
height = DIMENSIONS(1); | |
width = DIMENSIONS(2); | |
% Determine whether window size is an absolute size or a fraction of the | |
% window dimensions | |
if strcmp(WINDOWTYPE, 'fraction') | |
windowSizeX = width .* WINDOWSIZE(2); | |
windowSizeY = height .* WINDOWSIZE(1); | |
elseif strcmp(WINDOWTYPE, 'pixels'); | |
windowSizeX = WINDOWSIZE(2); | |
windowSizeY = WINDOWSIZE(1); | |
else | |
error('Invalid window type "%s"\n', WINDOWTYPE); | |
end | |
% Standard deviations | |
[sy, sx] = findGaussianWidth(height, width, windowSizeY, windowSizeX); | |
% Calculate center of signal | |
xo = round(width/2); | |
yo = round(height/2); | |
% Create grid of x,y positions to hold gaussian filter data | |
[x,y] = meshgrid(1:width, 1:height); | |
% Calculate gaussian distribution (X) | |
WindowX = exp( - ((x - xo).^2 / (2 * sx^2))); | |
% Calculate gaussian distribution (Y) | |
WindowY = exp( - ((y - yo).^2 / (2 * sy^2))); | |
% 2-D Gaussian Distribution | |
WINDOW = WindowX .* WindowY; | |
end |