MATLAB: Find main area of image

Question

Hello,

I am trying to lear how I can remove the small objects to find the main area of the image (the black section between the long lines (edges)? I want ot get rid of external and internal objects.

Thanks for the helps

Answer 1

#Approximate Here

se = strel('line',3,3);
BW1=imdilate(binaryImage,se);
BW2=bwareafilt(~BW1,1);
se = strel('line',3,3);
BW3=imerode(BW2,se);
se=strel('disk',7);
result=imclose(BW3,se);
imshow(result);