高斯平均算子检测物体

桃花猪

%Template for Gaussian averaging
%Usage [templete]=Gaussian_templete(number,number)
%winsize-size of template(odd,integer)
%sigma-variance of Gaussian function
f=imread(Ɖ.JPG');
winsize = zeros(5,5);
sigmasize=[1,1];
f1=rgb2gray(f);
[irows,icols]=size(f1);
[wrows,wcols]=size(winsize);
[srows,scols]=size(sigmasize);
% centre is half of window size
%centre=floor(winsize/2)+1
crhalf=floor(wrows/2)+1;
cchalf=floor(wcols/2)+1;
%we will normalise by the total sum
sum=0;
%so work out the coefficients and the rumming total
for j=1:wrows
        for i=1:wcols
          f2(j,i)=exp(-(((j-cchalf)*(j-cchalf))+((i-crhalf))*((i-crhalf)))/(2*srows*scols));%f2:template
          sum=sum+f2(j,i);
        end
end
%and then normlise
f2(j,i)=f2(j,i)/sum;
imshow(f2,[0 255]);



修改之后程序没有错误，可是出来的图超级小，针尖小，为什么呢？肯定是程序有问题。


如果我加入f2=zeros(irows,icols);显示的图像大小正常，但是是全部黑色。
%Template for Gaussian averaging
%Usage [templete]=Gaussian_templete(number,number)
%winsize-size of template(odd,integer)
%sigma-variance of Gaussian function
f=imread('a.JPG');
winsize = zeros(5,5);
sigmasize=zeros(1,1);
f1=rgb2gray(f);
[irows,icols]=size(f1);
[wrows,wcols]=size(winsize);
[srows,scols]=size(sigmasize);
f2=zeros(irows,icols);
% centre is half of window size
%centre=floor(winsize/2)+1
crhalf=floor(wrows/2)+1;
cchalf=floor(wcols/2)+1;
%we will normalise by the total sum
sum=0;
%so work out the coefficients and the rumming total
for j=1:wrows
        for i=1:wcols
          f2(j,i)=exp(-(((j-cchalf)*(j-cchalf))+((i-crhalf))*((i-crhalf)))/(2*srows*scols));%f2:template
          sum=sum+f2(j,i);
        end
end
%and then normlise
f2(j,i)=f2(j,i)/sum;
imshow(f2,[0 250]);

风花雪月

很显然，你这里设置

1. winsize = zeros(5,5);

复制代码

换句话来说
wrows,wcols两个值都是5，因此你行成的f2就只能是5*5的

你加上f2=zeros(irows,icols);后
虽然f2的大小和f1一致了，但是实际上的数据操作还是仅限于5*5的范围内
而其它点的值都是0，显然是黑色的