A REVIEW ON HIGH RESOLUTION IMAGE ENCRYPTION AND RECONSTRUCTION USING SCALABLE CODING

In today’s connected world, research. This paper proposes a unique scheme of scalable coding of transmitting and receiving images in an extreme protected way using Hadamard transform. In the encryption phase, the original pixel values are masked by a modulo - 256 addition with non - random numbers that are derived from a secret key. Then, the encrypted data are decomposed into several parts, and each part is compressed as a bit stream. After decomposing the encrypted data into a down sampled subimage and several data sets with a multiple - resolution construction, an encoder calculates the subimage and the Hadamard coefficients of each dataset to condense the data quantity. Then, the data calculates subimage and coefficients are observed as a set of bitstreams. Because of the hierarchical coding mechan ism at the receiver side with the cryptographic key, the principal content with higher resolution can be reconstructed when more bit streams are received.