Preserving the invaluable historic recording on gramophone records, whether it is speech or music, makes a lot of sense in our societies, because the traditional record play back system wears out the record gradually or even destroys some of the most fragile sample in the archives. This book presents a non-contact method to reproduce sound signal from gramophone records using 3D scene reconstruction of the micro-grooves carved on a record surface. An optical flow based framework for a record playing system is presented. A robust estimation method of computing the surface orientation was built...