Hello, I am trying to extract Building Footprints From Satellite Imagery,I have applied Morphological functions. But i am not able to separate buildings from roads and trees Present in urban areas

I=imread('rq_subset.tif'); %Read in image

im1=rgb2gray(I); % conversion frm RGB to Gray Image

figure,imshow(I);

level = graythresh(im1); % calculates threshold values using ostu's method

bw=im2bw(im1,level); %Convert image to binary image, based on threshold

figure,imshow(bw);

se = strel('square',2); %structure element Morphological unit

bw1 = imerode(bw,se); % morphological opening

figure, imshow(bw1);% display of image with structure element

bw3 = imdilate(bw1,se);

imshow(bw3);

b6=bwmorph(bw3,'remove'); % removes elements from inside the body

figure,imshow(b6);

B1=strel('rectangle',[4,2]);

B2=strel ('rectangle',[2,1]);

%se1=strel('square',4);

bw4=bwhitmiss(bw3,B1,B2);

figure,imshow(bw4);

se=strel('square',1);

bw5=imerode(bw4,se);

figure,imshow(bw5);

[shantanu shukla]

Rajat if u have the code for building extraction please share with me i really need it very much