Varun Bajaj is a subject Editor-in-Chief of the IET's Electronics Letters and has authored more than 90 research papers in various reputed international journals and conferences. G R Sinha has published more than 200 research papers; edited four books in similar research areas to this book, and authored key books on medical image processing and biometrics. He is visiting professor (honorary) at Sri Lanka Technological Campus Colombo. He is an ACM distinguished speaker, an IEEE senior member, a fellow of IETE and IEI and he has been IEEE distinguished lecturer. He has more than 12 research and teaching based awards at international and national level.