Varun Bajaj is Subject Editor-in-Chief of IET Electronics Letters (SCI) on biomedical technology and has also authored more than 90 research papers in various reputed international journals/conferences including IEEE Transactions, Elsevier, Springer and IOP Publishing. The citation impact of his publications is around 1762 citations, with a h-index of 19, and i10 index of 39 (Google Scholar June 2020). G R Sinha has published more than 200 research papers, edited four books on similar research areas to this book, and has authored key books on medical image processing and biometrics. He is Visiting Professor (honorary) at Sri Lanka Technological Campus Colombo. He is ACM Distinguished Speaker, IEEE Senior Member, Fellow of IETE and IEI, and has been an IEEE Distinguished Lecturer. He has more than 12 research and teaching based awards at international and national level to his credit.