how to fill up distorted images with proper pixels?

I have a distorted image of an spine and i need to fiil up those portions with black pixels so that i can get a uniform image. But as the boundary portions are also absent in many parts , using imfill(image,'holes') does not fill up those parts. Please suggest me a way to restore the image.

 I= imread('test1.jpg');
 figure, imshow(I);
 I=im2bw(I);
 I=~I;
 Ifill = imfill(I,'holes');
 Iarea = bwareaopen(Ifill,500);

I have used this code so far.

Answer 1

[Image Analyst]

See my answer to your duplicate question: http://www.mathworks.com/matlabcentral/answers/161252-how-to-fill-the-broken-edges-of-an-image#answer_158296