This Edited Volumecontains a selection of refereed and revised papers originally presented at thesecond International Symposium on Signal Processing and Intelligent RecognitionSystems (SIRS-2015), December 16-19, 2015, Trivandrum, India. The programcommittee received 175 submissions. Each paper was peer reviewed by at leastthree or more independent referees of the program committee and the 59 paperswere finally selected. The papers offer stimulating insights into biometrics, digital watermarking,recognition systems, image and video processing, signal and speech processing,pattern recognition, machine learning and knowledge-based systems. The book isdirected to the researchers and scientists engaged in various field of signalprocessing and related areas.