Securing Digital Photography Images by Encryption-Watermarking CFA (Color Filter Array) Images

Abstract

Research in image processing of digital color photography is in full expansion, especially on CFA (color filter array) images. These raw CFA images are very important for image analysis because they have not undergone any processing (interpolation, demosaicking, etc.) that would alter their reliability. The chapter presents three robust hybrid algorithms combining chaotic encryption and blind watermarking techniques of CFA images based on the quaternionic wavelet transform (QWT) to propose solutions related to the problems of confidentiality, security, authenticity of these images transmitted over digital networks, the size of some CFA images, and the large amount of data to be transferred in a non-secure environment where resources in terms of throughput and bandwidth are quite limited. The three hybrid algorithms were implemented simultaneously and successively.