New advances in borescopic measurement of defects on complex geometric surfaces such as internal engine components: Recent technological advances in Remote Visual Inspection (RVI) have made possible accurate borescopic measurement of defects on curved surfaces and other critical in-situ automotive surfaces. The new system is based on principles of CAD (Computer Aided Design) combined with orientation methods that eliminate measurement inaccuracies caused by defects that do not lie at 90° to the optical axis of the borescope. The measurement techniques are accurate, easy to learn and use, and work existing Videoimagescopes and borescopes or fiberscopes of any make, equipped with video cameras.New advances in electronic technology improve measurement: A major area of recent technological development for Remote Visual Inspection lies in video equipment. The use of CCD (Charge Coupled Device) image sensors has improved resolution of video images, light sensitivity, and compactness of RVI instruments. Miniaturization has led to the ability to put CCD sensors inside the engine through small access holes. New RVI scopes are available similar to fiberscopes, except that they have CCD imaging chips on the distal end instead of coherent fiberoptic bundles. The images are displayed on a video screen in real time and true color.A computer-based video analyser system that is menu driven, can now accept video input from any RVI source. Its functions, in addition to video display of RVI images, include digital freeze-frame, storage, movable pointers, telephone line image transmission, search and retrieval of images, zoom magnification, side-by-side image comparison and image enhancement. It has in residence, 3-D software for measuring individual internal engine components when their image is captured from any prospective.