Importance

Loading Importance Indicators...

Abstract

A method and apparatus for registering an image using coherent radiation. Spatial homodyne means are employed to generate component signals which comprise a homodyne equivalent of the image, and the component signals of the homodyne equivalent are registered at a registering medium. Using a new principle of construction, the invention achieves on standard registering media a substantial improvement in conrast resolution. Indeed, the number of contrast levels that can be registerd by the invention is the square of the number that can be registered by the prior art. The application of temporal submodulation in a device embodying the invention additionally provides tensor parasitic phase-shift invariance. The invention may be embodied in a class of spatial-temporal-spatial image recording devices, such as videotape recorders and television transmission systems, in which a sequence of images is registered in the form of a temporal signal, and then reconverted from the temporal signal into sequence of reproduced images.

Loading the Abstract Image...

First Claim