This report contains a survey of the operation and properties of various types of joint transform correlators, as a precursor to their consideration as the central component in analogue optical precision image registration systems. The exact meaning of the term 'precision image registration' is articulated. At the very least, an analogue optical system should have the ability to variably magnify and rotate images if it is to have prospects of executing precision image registration. Motivated by this, an appraisal of various optical techniques of image rotation is undertaken. These investigations lead to an objective assessment of the feasibility of conducting precision image registration by suitably enhanced joint transform correlators. Qualitative comparison between analogue optical and digital electronic techniques of precision image registration, favours the latter as the methodology for a practical system.