. 1: Introduction -- Ch. 2: Relevant research, 2.1. Previous implementations on compression, encryption and data hiding algorithms -- Ch. 3: SCAN-based compression / encryption / data hiding algorithms -- Ch. 4: Smoothing, edge detection and colour segmentation algorithms in colour images -- Ch. 5: Architecture of compression / encryption / data hiding and decompression / decryption / data unhiding subsystems of SCAN algorithm -- Ch. 6: Architecture of smoothing, edge detection and color segmentation algorithm