Secure and Efficient Image Retrieval over Encrypted Cloud Data

Algorithm 1

Building balanced binary tree.

Input: , ; Balanced Binary Clustering, i.e.,

 BBC.

Output: Balanced Binary Tree .

(1)  //the height of node

(2)  root node

(3) function

(4)   two clusters , ,

         separating vector as the index

(5)  if the size of 2 then

(6)    internal node

(7)  else

(8)    leaf node

(9)  end if

(10)  if the size of 2 then

(11)    internal node

(12)  else

(13)    leaf node

(14)  end if

(15)  

(16)  return , ,

(17) end function