Imperfect transmission of block-coded images often causes lost blocks.
These blocks may contain very important information of image. In this
paper, an efficient method of error concealment scheme is proposed for
restoring lost blocks and lines in medical images that are transmitted over
error prone network such as the internet and wireless networks. It adopted
the idea of data hiding that can be implemented in the DCT domain. The
algorithm determines the most important information in each block of
original image and rotated one by 900 clockwise and embeds this information
into another block that is not adjacent to it, since adjacent blocks have high
probability to be lost at the same time. Simulation results show that the
visual quality and the PSNR evaluation of a reconstructed image are
significantly improved using the proposed scheme with respect to other