How to add two images

I want to add two images,such that the crack portion,is hided ,kindly help

clc
clear all
close all

gauss = fspecial ('gaussian' , [ 5 5 ] ) ; % Ga u s s i a n Blur F i l t e r
% I=double(imread('crack1.png'))./255 ;
I=imread('crack1.png');
I=rgb2gray(I);a=I;
I1= imfilter(I,gauss ) ;

s=strel('square',3);
h=imsubtract(imclose(a,s),a);
% IMG=double(imresize(h,[256 256]));
IMG=h;
imshow(h),figure,imshow(a)

level = graythresh(IMG);
BW = im2bw(IMG,level);
imshow(BW)
figure,imshow(BW)

SE = [strel('line' , 3 , 0)
    strel('line',3,45)
    strel('line',3,90)
    strel('line',3,135)] ;
ERED = BW-imerode ( BW ,s ) ;
figure,imshow(ERED)
BW2 = bwareaopen(ERED,100);
figure,imshow(BW2)

bw2 = imcomplement(BW2);
image2 = int8(bw2).*200;
figure,imshow(image2)
image3=imcomplement(image2);
figure,imshow(image3)
B=imdilate(image3,SE);
figure,imshow(B)

I want to add B and original imaghe a,such that the crack portion is filled,plz help

[nkumar]

my image is http://imgur.com/qNWwyWH,2bmFCxb,yes i want to add B and original image,when added the image clarity gets disturbed,i have uploaded image and output image also

Answer 1

[Image Analyst]

Where did you upload your images? So I can't see what you're seeing.

If you don't cast to double or 16 bit, your images will clip if their sum would be greater than 255. But I just see a bunch of morphology code, not code to add images.