Image converting from double to 0-255 sclae

Hello,

I want to convert image after filtering

After filtering, the filtered image consist of positive and negative number(X.xxxx)

I want change this type of number to 0-255 integer for calculation of average and standard deviation of image.

I want to know if there is any solution to this problem. kindly help.

I already tri to convert image using mat2gray and im2uint8.

failed result....

matlab script

A=imread('solid print_1.tif');

[M N]=size(A);

A=double(A);

F1=fft2(A);

u=0:(M-1);

v=0:(N-1);

idx=find(u>M/2);

u(idx)=u(idx)-M;

idy=find(v>N/2);

v(idy)=v(idy)-N;

[U,V]=meshgrid(u,v);

D=sqrt(U.^2+V.^2);

D0=76.2;

W=50.8;

H1=double(D<(D0-W/2));

H2=double(D>(D0+W/2));

H=double(H1|H2);

H=1-H;

G=H.*F1;

G=ifft2(G);

G=real(G);

ff=abs(fftshift(H));

subplot(131),imshow(A,[0 255]),title('1')

subplot(132),imshow(ff),title('2')

subplot(133),imshow(G,[]),title('3')

Answer 1

[Stalin Samuel]

converting from double to 0-255 sclae