Intopix S.a.

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

Intopix

Pascal Hubert Pellegrin

Gaël Rouvroy

Charles Daniel Buysschaert

Valentin Dessy

Thomas Denison

Joachim Keinert

Tanguy Gilmont

Sébastien Lugan

Renaud Ambroise

Naomi Rousseau

Allan Barrea

Christophe Biernaux

Guillaume Demaude

Miguel Angel Martinez Del Amor

Gauthier Crucifix

Miguel Angel MARTÍNEZ Del Amor

An image processor processes an image having color pixels (R, G, B) arranged in a Bayer pattern. The image processor provides a de-correlated image composed of three types of components (Y, Cr, Cb). The image processor provides a component of the first type (Y) as a substitute for a pixel of the first type (G), whereby the component of the first type (Y) is a weighted combination of a cluster of pixels that includes the pixel of the first type (G) and neighboring pixels, wherein neighboring pixels of the second and third type (R, B) have an overall positive weighting factor corresponding to an overall addition of neighboring pixels of the second and third type (R, B) to the pixel of the first type (G). The image processor also provides a component of the second type (Cr) and a component of the third type (Cb) in similar fashion.

Image processor

In encoding a sequence of frames, a linear transform, such as, for example a wavelet transform, is applied to the sequences of frames on a frame-by-frame basis. At least one portion of a linearly transformed frame thus obtained is encoded in the inter mode on the basis of a differential representation of the linearly transformed frame. The differential representation corresponds with a difference between, on the one hand, the portion of the linearly transformed frame and, on the other hand, a representation of a corresponding portion of at least one other linearly transformed frame. Data compression is then applied to the differential representation of the portion of the linearly transformed frame.

Encoder and method of encoding a sequence of frames

The disclosure relates to a method for compressing in a packed data set a color image comprising color image samples arranged in a reference grid according to a sampling pattern, and comprising the steps of (a) performing a decorrelative transform providing component images, (b) performing a number of discrete wavelet decompositions on said component images and (c) forming packets in the packed data set by processing each consecutive line in the reference grid and each component and grouping all samples of said component in said line in one or more packets, and appending said one or more packets to the packed data set. The disclosure also relates to a device for compressing, a computer program for compressing, a method for decompressing, a device for decompressing, and a computer program for decompressing. The disclosure also relates to the packed data set produced by said method for compressing.

Method and apparatus for performing compression of a color image

The invention relates to a method for compressing an input data set, wherein the coefficients in the input data set are grouped in groups of coefficients, a number of bit planes, GCLI, needed for representing each group is determined, a quantization is applied, keeping a limited number of bit planes, a prediction mechanism is applied to the GCLIs for obtaining residues, and an entropy encoding of the residues is performed. The entropy-encoded residues, and the bit planes kept allow the decoder to reconstruct the quantized data, at a minimal cost in meta-data.

Method and device for digital data compression

An apparatus for encoding image data, the image data being decomposed into a plurality of different subbands, each subband having a plurality of coefficients, wherein a precinct has different sets of coefficients from different subbands, wherein two sets of coefficients of a first precinct belong to a first spatial region of an image represented by the image data, the apparatus having: a processor for determining, for each group of coefficients within a set, a greatest coded line index (GCLI); an encoder for encoding the greatest coded line indices associated with a first set of the first precinct in accordance with a first encoding mode, and for encoding the greatest coded line indices associated with a second set of the first precinct in accordance with a second encoding mode, the second encoding mode being different from the first encoding mode; and an output interface for outputting an encoded image signal having data on the encoded greatest coded line indices and data on the coefficients.

Apparatus and method for encoding or decoding using a subband dependent prediction adaptation for GCLI entropy coding

The invention provides a method and device for compressing a sequence of signed coefficients wherein coefficients are grouped, for each group, the greatest coded line index (GCLI) is determined, a quantization level t is applied and only the GCLI-t lowest weight bits of the coefficients are copied into the output stream together with the value of the GCLI. According to the invention, sign bits are not coded for coefficient having a zero quantized value. The invention also provides a method for determining a data budget required for compressing a sequence of signed coefficients, in dependence of a quantization level, and a method for compressing an image within the limits of a given data budget constraint. The invention provides a compressed data set coding an image in an efficient way.

Method and device for digital data compression with sign bit removal

The invention provides a method for mapping a data stream onto an SDI channel, said data stream comprising a sequence of m-bit words, a range of values from 0 to 2**n&#x2212;1 and from 2**m&#x2212;2**n to 2**m&#x2212;1 being excluded values on said SDI channel. The method comprises the steps of grouping the words to be transmitted, detecting if at least one of the words of the group contains a number of MSB's equal to one, and then recoding these MSBs and adding a constant, in order that no excluded values are obtained. Supplementary bits signal groups that have been recoded.

Method and device for mapping a data stream into an SDI channel

A method and a device compress a display stream wherein coefficients are grouped, for each group, the greatest coded line index (GCLI) is determined and only the GCLI lowest weight bits of the coefficients are copied into the output stream together with the value of the GCLI. The method and device provide a good compression efficiency together with a simple hardware.

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Wierde, Belgium

Pascal Hubert Pellegrin