[scilab-Users] Synthetic Aperture reconstruction

[GOBILLOT Gilles 116128]

Hi,

I try to rebuild images starting from ultrasonic measurements.
The techniques using aperture synthesis (SAFT or SAR) seem to be
appropriate: on the basis of a N by N points measurement one can
represent an image of M by M
To accelerate the treatment I try to use a frequential method (FD-SAFT).

The algorithm is simple, but I do not manage how to change the scale of
the image:
    G=fft(measurement);
    B=exp(%i*2*kz*(1-(kx/2/K)^2-(ky/2/K)^2));
    Gprime=G*B;
    FSAFT=fft-1(Gprime);

Where measurement is N by N
And FSAFT would be M by M

Can somebody help me?


Gilles