How to remove frame boundary from object boundary

How can I remove the false object boundaries detected at the frame edges ? I only need the curve part to be my boundary.

Here is my code:

clc; clear; close all; 

OM = imread('002.jpg');
imshow(OM)
W = rgb2gray(OM);
imshow(W)

binaryImage=imbinarize(W);

hold on

imshow(binaryImage);

BW = bwareafilt(binaryImage,1);

[B,L,N] = bwboundaries(BW,'noholes');

imshow(BW); hold on;
for k=1:length(B),
   boundary = B{k};
   if(k > N)
     plot(boundary(:,2), boundary(:,1), 'g','LineWidth',2);
   else
     plot(boundary(:,2), boundary(:,1), 'r','LineWidth',2);
   end
end

[Varun Garg]

Can you attach the image for me to replicate the whole thing?

[Syed Sameer Ul Hasan]

Sure. Here it is. https://drive.google.com/file/d/1hMiDy5iIeS_Xlu1JilLBMXdrx0NRow9K/view?usp=drivesdk

Which transforms to:

https://drive.google.com/file/d/1TVenArXSqDcD2JSC4Md4R40LpTNuNJxT/view?usp=drivesdk

Answer 1

[KSSV]

If (x,y) are your boundary points......something like below should work:

[m,n] = size(I) ;
% 
x(x==1) = [] ;y(x==1)= [] ;
x(x==m) = [] ;y(x==m) = [] ;
x(y==n) = [] ;y(y==n) = [] ;