8x8 Block Image Compression and Encryption Algorithm for Color Images using SCAN

A color image can be compressed and encrypt using scan pattern. The methodology used here is a combination of different scan pattern which is used on the binary images derived from each component image of a color image. The color image is first split into three component images (red, green, and blue). After that each component image is further split into its corresponding bit planes. As bit plane image is a binary image, the algorithm is applied on each bit plane. And then all the bit plan is combined together to get the compressed and encrypted image. The compression scheme used here is run length coding. At first the bit plane is rearranged using a set of can pattern, which forms the encrypted image. The combination of scanpaths is kept secret and it is used as the key for encryption. After encryption is done, run length coding is applied on the encrypted image to compress them. Each bit plane is operated like the same and then combined to attain the final output. The aim of the work is to find a good combination of scan path, which can represent the image using least number of bits.