Image data compression/expansion system having an analog interpolation

Abstract

An image data compression/expansion system capable of compressing/expanding image data at a high speed and less costs is provided. The system includes an image data compression device provided with an extraction circuit for extracting, from pixel information of an image composed of pixels, characteristic data each representing a characteristic value, such as a luminance and a color difference of a pixel, which is of significance for the image, and a position data of such a significant pixel, and includes an image data expansion device which interpolatingly forms characteristic data of all the pixels of the image from the characteristic and position data of the significant pixels. The image data expansion device includes an interpolation matrix (214) having signal points (Pij) interconnected through impedance elements (300, 301) and a characteristic data supplying arrangment responsive to the position and characteristic data fed from the image data compression device for supplying these characteristic data to those of the signal points (Pij) which are indicated by the position data, respectively, so that the characteristic data of all the pixels which have been formed by the interpolation are obtained at the respective signal points (Pij) of the interpolation matrix.