Conjugate-channel compression of images to be multitoned

Abstract

Image reconstruction is provided by sending low frequency image information via a first transmission channel and high frequency edge information via a second channel. This provides the needed high frequency information which exists in the vicinity of edges, but not the high frequency information which exists in other areas of the image. A process for the compression and transmission of original images containing both low frequency information and high frequency includes the steps of compressing the low frequency information, transmitting the compressed low frequency information, multitoning the low frequency information to form a multitoned reconstruction, multitoning the original image to form a multitoned original, calculating a residual signal as the difference between the multitoned original and the multitoned reconstruction, and transmitting the residual signal.

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