Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Siegfried Foessel

Joachim Keinert

Thomas Richter

Herbert Thoma

Christian Scherl

Miguel Ángel Martínez Del Amor

Manuel De Frutos López

Wolfgang Heppner

Sergej Wtjurin

Heiko Sparenberg

Michael Schoeberl

Marcus Wetzel

Volker Bruns

Arne Nowak

A coding efficiency improvement is achieved by performing bit-plane coding in a manner so that coefficient groups for which the set of coded bit-planes is predictively signaled in the datastream, are grouped in two group sets and if a signal is spent in the datastream which signals, for a group set, whether the set of coded bit-planes of all coefficient groups of the respective group set are empty, i.e. all coefficients within the respective group sets are insignificant. In accordance with another aspect, a coding efficiency improvement is achieved by providing bit-plane coding with group-set-wise insignificant signalization according to the first aspect as a coding option alternative relative to the signalization for group sets for which it is signaled that there is no coded prediction residual for the coded bit-planes for the claim groups within the respective group set.

Bit-plane encoder and decoder

Transform coefficients encoder and decoder

Concepts are presented herein how to efficiently create a suitable palette for low complexity image and video coding. A combination of the palette coding with transform coding is feasible.

Image compression technique

Transform block coding is performed very efficiently in terms of computational complexity and compression ratio, by coding the magnitude bits of the transform coefficients distributed in a matrix, in which the magnitude bits of the spectral coefficients are arranged column-wise with the spectral coefficients of the transform block ordered along a row direction of the matrix. That is, magnitude bits within a certain column of the matrix belong to a certain spectral coefficient, while magnitude bits within a certain row of the matrix belong to a certain bit plane. In this configuration, the distribution of non-zero magnitude bits may be condensed towards one corner of the matrix, corresponding to, for instance, the least significant bit plane and corresponding to, by using a scan order among the transform coefficients which sorts the transform coefficients generally in a manner from lowest to highest frequency, the lowest frequency. Various low complexity variants are presented.

Transform block coding

Bit-plane coding

The invention relates to a raw image encoder for encoding a raw image of a predetermined color pattern according to which the raw image is partitioned into pixel cell blocks, each pixel cell block comprising four pixels, each pixel being associated with one of three base colors so that each pixel cell block comprises, for each of the three base colors, at least one pixel, the raw image encoder configured to subject the raw image to a color transformation to obtain a color image, by mapping, for each pixel cell block, the four pixels of the pixel cell block onto a color component quadruple forming a sample of the color image, the color component quadruple comprising three color component values of a target color space, and one pseudo color component value, and subject the color image to a multi-component picture encoding to obtain a compressed data stream.

Compression of a raw image

A device for caching a scalable original file having a first structure which has a header and a plurality of information packets for different information levels has a cache memory configured to cache a proxy file and/or information packets of the proxy file and a proxy file generator configured to generate a proxy file such that the latter is transferable into or directly has a second structure, which corresponds to the first structure of the original file. The proxy file generator further is configured to read out a first information packet of a basic information level from the original file and insert it into the proxy file at a position specified by the second structure and to output the proxy file in the second structure, so that in the second structure, at least one of the information packets of a non-basic information level is replaced with an empty information packet.

Device for caching a scalable original file

A system for generating an output image is provided. A first camera of a camera pair is configured to record a first portion of a scene to obtain a first recorded image. A second camera of the camera pair is configured to record a second portion of the scene to obtain a second recorded image. Moreover, a central camera is configured to record a further portion of the scene, to obtain a central image. A processor is configured to generate the output image. The first brightness range of the first camera of each camera pair is different from the central-camera brightness range and is different from the first brightness range of the first camera of any other camera pair of the one or more camera pairs.

Growing community of inventors

Erlangen, Germany

Siegfried Foessel