PERCEPTIBLE REVERSIBLE WATERMARKS

摘要

The invention relates to methods, devices and a signal, where an encoder compresses a first piece of information in the form of at least a first limited part of an image, provides perceptible additional information ( 38 ) related to the image, and provides the compressed first piece of information ( 40 ) in the image ( 36 ) and a decoder retrieves the image including the compressed first piece of information in the form of at least a first limited part of the image as well as the perceptible additional information, retrieves the perceptible additional information, and decompresses at least the compressed piece of information essentially without the losses for provision of at least one of image and perceptible additional information essentially without losses. The invention also relates to an image editor, a computer program product and a computer program element for processing additional information ( 38 ) such that the original image is restorable.