MATLAB: How do i segment the lung region after thresholding from a CXR image.I have provided the image below.

Question

im=dicomread('C:\Users\user\Desktop\re.dcm');

im1=histeq(im);

imb = imbinarize(im1,'global');

Answer 1

You forgot to attach re.dcm.

Get rid of the histogram equalization call - that never helps. It's totally unnecessary.

See my lung segmentation routine, attached.