AN EFFECTIVE APPROACH OF IMAGE RETRIEVAL USING SCALABLE IMAGE ENCRYPTION

The encryption has a comprehensive scheme for providing confidentiality of security such as privacy, reliability and authentication of information. This paper proposes a unique scheme of scalable coding of transmitting and receiving images in an extreme protected way using Absolute Moment block truncation coding (AMBTC). The gray level pixel of image has compressed by AMBTC then encrypted image is acquired by adding compressed AMBTC pixel value that has masked by a modulo-256 addition with PRNG (Pseudo Random Number Generator) that has derived from a secret key Subsequently encrypted image data into a down sampled sub image and some data groups using a multiple-resolution creation, an encoder gives the quantized sub image and the Harr coefficients of all data set to reduce the data. Then, the data of quantized sub image and coefficients are held as a set of bit streams transmitted. At the receiver side, although a sub image is decrypted to give the rough information of the original image, the quantized coefficients are used to reconstruct the original image with an iterative procedure. Due to the hierarchical mechanism, the original image with higher resolution reconstructed by decompressing the decrypted pixel value using AMBTC.