MATLAB: How to fill everything below the white thing line in this image

digital image processingimageimage analysisimage processinginterpolationMATLAB

In the image I have attached, how can I fill the entire area below the thin white line plotted? Thank you!

Best Answer

By adapting the following smaller example,
A =
     1     0     0     0     0     0     0     0
     0     1     0     0     0     0     0     0
     0     0     1     0     0     0     0     0
     0     0     0     1     0     0     0     0
     0     0     0     0     1     0     0     0
     0     0     0     0     0     1     1     1
     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0
>> B=cummax(A,1)
B =
     1     0     0     0     0     0     0     0
     1     1     0     0     0     0     0     0
     1     1     1     0     0     0     0     0
     1     1     1     1     0     0     0     0
     1     1     1     1     1     0     0     0
     1     1     1     1     1     1     1     1
     1     1     1     1     1     1     1     1
     1     1     1     1     1     1     1     1
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