Picture compressing and restoring system and record pattern forming method for a spatial light modulator.

摘要

A multiplication means (51) memorizes a series of optical density figures representing a series of orthogonal function patterns and performs optical multiplications upon an original picture in comparison with each of the orthogonal function patterns. A summation means (52) determines the expansion coefficients of the orthogonal functions for the whole original picture from the operation results obtained by the multiplication means (51). A quantizing and encoding means (53) quantizes and encodes the orthogonal function expanding coefficients obtained by the summation means (52) for compressing the data. The encoded data is transmitted to a picture restoring section which has the same optical system as the picture compressing section. This enables the system to conduct two-way picture encoding and restoring.