Abstract: The invention relates to a device for forming diagnostic images of a patient, which device includes an excitation member for irradiation or exposure of the patient, a detector for receiving radiation and for converting the radiation into image information, an image processing member which is connected to the detector and has a functionality for enhancing or modifying the image information, a monitor which is connected to the image processing member, and a storage medium for the temporary storage of a series of images for a predetermined duration; during operation the image processing member executes a first sub-operation on the image information in order to provide pre-processed image information which is stored in the temporary storage medium, whereas during the display of the preprocessed image information from the temporary storage medium the image processing member executes at least a second sub-operation thereon, the first sub-operation and the second sub-operation together providing the functionality of

Abstract: A known method of watermarking an information signal is based on extraction of salient points (21) of the signal (e.g. zero crossings in audio, edges of an image) and “warping” (24) said salient points towards a given watermark pattern (W). One step in the embedding and detection process is determining (22) whether or not salient points lie “on” or “off” the watermark. This is a hard decision.