Research Article
RONI Based Secured and Authenticated Indexing of Lung CT Images
Algorithm 3
Secured watermark embedding algorithm.
Input: Lung CT image, index position of RONI, secret key and the watermark image | Output: Watermark embedded image | begin | crop and save host image from input image using index position of RONI | verify whether the host image can accommodate the watermark image. | convert host image and watermark image into single column vector | start inserting header to the host image | convert the bit position of the host image with respect to the secret key | end header | calculate the indices for the next pseudo-random pixels | start inserting actual watermark image | calculate the linear index of the pixel to be changed | alter the least significant bit of the pseudo random index | end insertion | end |
|