Fourier-Mellin based Image Registration (with GUI): hipass_filter(ht,wd) - File Exchange

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Highlights from
Fourier-Mellin based Image Registration (with GUI)

fm_gui.m
crosspowerspectrum(in1,in2) USAGE : cps = crosspowerspectrum(in1,in2)
fm_guifun(action) GUI functions for Fourier-Mellin transform GUI
fm_parse_inputs(data) fm_parse_inputs(data)
fourier_mellin(data) USAGE : [combImage,registered1,registered2,reg_output,cps_rs,cps_trans] = fourier_mellin(data)
hipass_filter(ht,wd) hi-pass filter function
image_scale(input,lower,upper) USAGE : output = image_scale(input,lower,upper)
imlogpolar(varargin) IMLOGPOLAR Compute logarithmic polar transformation of image.
parse_inputs(varargin)
readpgm( filename )
transformImage(A,Ar,Ac,Nrho,N...
w=window1d(p,wtype,param) USAGE: w=window1d(p,wtype,param)
w=window2d(p,q,wtype,param)
zeropad(i1,i2,centre_flag)
fft_resize_test.m
help_fm.html
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from Fourier-Mellin based Image Registration (with GUI) by Adam Wilmer
GUI-implementation of the Fourier-Mellin transform for simple image rotation, scale and translation.

hipass_filter(ht,wd)

function H = hipass_filter(ht,wd)
% hi-pass filter function
% ...designed for use with Fourier-Mellin stuff
res_ht = 1/(ht-1);
res_wd = 1/(wd-1);

eta = cos(pi*(-0.5:res_ht:0.5));
neta = cos(pi*(-0.5:res_wd:0.5));
X = eta'*neta;

H=(1.0-X).*(2.0-X);
%figure,mesh(H),title('The high-pass filter')

Highlights from Fourier-Mellin based Image Registration (with GUI)

Highlights from
Fourier-Mellin based Image Registration (with GUI)