Eizo Gmbh

Siemens Aktiengesellschaft

Uwe Nagel

Klaus Burkhardt

Hartmut Schulz

Wolfgang Eckhardt

Andreas Kärcher

Achim Breunig

Andreas Kaercher

Erich Schaefer

The invention pertains to a method for operating an image-processing device, in which an image signal is digitally transmitted between a transmitter and at least one receiver, and in which the image signal comprises a timed sequence of images. An alternating signal which alternates at a signal alternation frequency is superimposed on the image content of the images before they are transmitted, and the signal alternation frequency is greater than or equal to the perception frequency resolvable by the human eye. The invention also pertains to an image-processing device.

Method for identifying improper transmission of images in an image-processing device and a corresponding image-processing device

The invention pertains to a method for operating an image-processing device in which an image signal on which a noise signal is superimposed is digitally transmitted between a transmitter and at least one receiver, and in which the image signal comprises a timed sequence of images, each containing its own image content and a noise pattern of the noise signal superimposed on the image content. At least certain areas of at least two successive images of the image signal are compared to each other after the transmission, and if a difference is found between the noise patterns contained in the images, it is concluded that the images have been transmitted successfully even if the image content of the images is identical. The invention also pertains to an image-processing device for the digital transmission of an image signal on which a noise signal is superimposed.

Method for operating an image-processing device and a corresponding image-processing device

In certain medical systems, such as modalities, it is not desirable to install a program for adjusting an image reproduction characteristic curve with respect to a reference characteristic curve. An arrangement which comprises a mobile telephone, an LCD display module and a look-up table to facilitate said adjustment is provided.

Arrangement comprising a mobile telephone and an LCD display module

A method and an arrangement for optimizing the luminance characteristic curve for a display system using a lookup table. Digitized video levels are supplied to this lookup table and are optimized using correction values stored in the lookup table. With suitable means, the luminance characteristic curve can be easily adapted to standards and/or custom specifications. The memory requirement is low, since it is not necessary to provide different lookup tables for different ambient luminosities or selected reproduction models (curves).

Method and arrangement for optimizing a luminance characteristic curve

A method for adjusting the scanning frequency and/or the scanning phase of an analog/digital converter () of an image-reproducing device that has a digitally controlled display () for displaying an image of a predefined number of lines and a predefined number of pixels per line. The digitally controlled display receives digital image data from the analog/digital converter (). The analog/digital converter generates the digital image data by scanning with a scanning signal that has the scanning frequency and the scanning phase of an analog video signal (). Therein, the analog video signal () is applied to the image-reproducing device, and the digital image data is buffered in an image memory (). The digital image data is compared with predefined data that correspond to the analog video signal, and the scanning frequency is adjusted until a comparison of the data provides a sufficient match. An associated device has an image generator () for generating the analog video signal () and a memory () for storing the predefined data for comparison with the digital image data.

Method for adjusting the scanning frequency and/or scanning phase of a digital image reproducing device

A method and a circuit arrangement for controlling the operating point of a cathode ray tube ( ) for use in image technology applications. A video signal ( ) is supplied to both the tube ( ) and to a cathode ray tube model ( ), which the model ( ) uses to emulate a beam current. From the emulated beam current and a measured beam current, a characteristic quantity for adjusting the operating point is determined.

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Karlsruhe, Germany

Uwe Nagel