Other

Bayer Innovation Gmbh

Peter Toth

Gábor Szarvas

Gábor Erdei

László Domjan

Pál Koppa

P S Ramapujam

G&aacute;bor Szarvas

József Károly

Em&ouml;ke L&ouml;rincz

László Domján

Soren Hvilsted

P&aacute;l Koppa

P&eacute;ter Richter

Karoly Jozsef

Tamás Újvári

Tamás Ujvari

The invention concerns a method for compressing a digitally coded video frame sequence. In the method, a given frame is divided into blocks, and the information content of selected blocks is modified, relying on information contained in a neighboring block or blocks (prediction), and the blocks are converted from spatial representation into frequency representation. The information content of the transformed blocks is encoded by arithmetic coding. The efficiency of the coding is improved by various methods, such as dynamically partitioning the blocks into sub-blocks, or performing a compressibility analysis is the blocks before carrying out further transformations. The entropy coding uses a neural network to determine the parameters of the arithmetic coding. The frames are dynamically re-scaled, depending on available bandwidth and quality of the coded image.

Hybrid video compression method

There is disclosed a method and apparatus for coding data, for the purpose of preventing unauthorised readout of information. In the method, user information is converted into digital data (UD), and the digital data is recorded in a first data set (CD) and a second data set (HD), where the first data set (CD) is recorded in a first optical storage medium of a data carrier, and the second data set (HD), is recorded in a second, holographic storage medium of the data carrier. According to the method, the digital data (UD) is divided between the first and second data sets (CD,HD) in a manner so that a part of the user information is contained only in the first data set (CD), and another part of the user information is contained only in the second data set (HD), and the relative proportion of the user information in the data sets is selected so that the information contained in any one of the data sets is insufficient by itself to restore the complete user information (UD) contained in both data sets.

Method and apparatus for the encryption of data

There is disclosed a method for the holographic recording of data, wherein a hologram containing the date is recorded in a waveguide layer ( ). The holograms are formed in a layer structure containing multiple waveguide layers ( ). Coupling means ( ) are provided for selectively coupling the reference beam ( ) into the single waveguide layers ( ) of the layer structure. The invention also relates to an arrangement for holographic recording of data, comprising a data storage medium with a waveguide holographic storage layer, and an optical system for writing and reading the holograms. The optical system comprises means for imaging an object beam ( ) and a reference beam ( ) on the storage medium. The arrangement comprises multiple waveguide holographic storage layers ( ) in the storage medium, and means for selectively coupling the reference beam ( ) into the single waveguide layers ( ) of the layer structure.

Method and system for recording of information on a holographic medium

Method of storing and retrieving information by exposing cells of a storage medium to a first beam of light having a first set of properties affecting the optical properties of said storage medium, and by exposing a plurality of individual cells, forming a page of information, of said storage medium to a second beam of light having a second set of properties. A third light beam from said storage medium forms an image of said page on a detecting means. The detected light image is converted into electric data signals, each bit of said data signals corresponding to a cell of said storage medium. The first beam of light is generated by a first light source and there is provided an electrooptical means having an electric input for receiving data and being arranged for modulating said first light beam in dependance of said data. The storage medium comprises a plurality of pages, each page having a plurality of individual cells, and optical properties of said individual cells of said storage medium being changed by said first light beam to correspond to said data.

Memory card recording/reproducing with two light sources and a light value matrix

Optical storage device having a plurality of juxtaposed memory cells

An optical filter for welding protective lens assemblies has two parallel electro-optical cells, at least one of the cells being of the nematic type with admixture of dye molecules with anisotropic light absorption. The filter comprises a filter sheet disposed in the ray path of the cells and allowing transmission within a wave range which is offset with respect to the wave range within which said one cell is transmitting residual light in its absorbing state.

Optical filter for protective welding lens assemblies

Growing community of inventors

Asarum, Sweden

Peter Toth