小编kos*_*rge的帖子

我正在尝试构建2D盒函数的FFT和2D高斯函数的FFT的乘积.之后,我发现逆FFT,我期待这两个函数的卷积.但是,我得到了一个奇怪的片面结果,如下所示.结果显示在右下方subplot.

我写的重复上面的Octave代码subplot以及我为构造卷积而执行的计算如下所示.谁能告诉我我做错了什么？

clear all;
clc;
close all;
% domain on each side is 0-9
L = 10;
% num subdivisions
N = 32;
delta=L/N;
sigma = 0.5;
% get the domain ready
[x,y] = meshgrid((0:N-1)*delta);
% since domain ranges from 0-(N-1) on both sdes
% we need to take the average
xAvg = sum(x(1, :))/length(x(1,:));
yAvg =  sum(y(:, 1))/length(x(:,1));
% gaussian
gssn =  exp(- ((x - xAvg) .^ 2 + (y - yAvg) .^ 2) ./ …