An apparatus and method for encoding of a video picture is disclosed. The video picture has a plurality of pictures. The pictures each have a plurality of macroblocks. The macroblocks each have a plurality of sub-blocks. The apparatus comprising a first module configured to generate a transform coefficient C ij for each of the sub-blocks of the macroblock. The apparatus further comprises a second module configured to variably quantize the transform coefficient by a scaling factor Q p based on the complexity of the picture and any rate control requirements.

An apparatus and method for motion video encoding employing an adaptive quantizer

A method and apparatus are provided for processing digital video signals for transmission in a compressed form. A set of pixel data is compressed without motion compensation to provide a first compressed video signal. The pixel data is compressed using motion compensation to provide a second compressed video signal. The data in the first and second compressed video signals is quantified. A comparison is made to determine which of the signals contains the least data. Successive sets of pixel data are sequentially compressed and quantified and the compressed video signal having the least data for each particular set is selected. The selected signals are encoded to identify them as motion compensated or non-motion compensated signals, and combined to provide a compressed video signal data stream for transmission. Apparatus for receiving and decoding the signals is also disclosed.

Adaptive motion compensation for digital television

Encoder/decoder buffer overflow and underflow encountered when employing actually variable or effectively variable bit-rate channels for communicating encoded video images and corresponding audio signals are overcome by adjusting the parameters of a video encoder in response to a representation of cell delay variation, i.e., jitter, determined at a remote decoder.

Encoder/decoder buffer control for variable bit-rate channel

A video signal encoding system includes a signal processor for segmenting encoded video data into transport blocks having a header section and a packed data section. The system also includes reset control apparatus for releasing resets of system components, after a global system reset, in a prescribed non-simultaneous phased sequence to enable signal processing to commence in the prescribed sequence. The phased reset release sequence begins when valid data is sensed as transiting the data lines.

Reset control network for a video signal encoder

A system for synchronizing first and second video signals which are to be combined is disclosed. The second signal is data compressed digital signal containing macro blocks of composite data preceded by a field sync flag synchronized with the field rate of the first signal. Each macro block contains a video block including a plurality of image line blocks. Each line block contains multiplexed video data such as luminance and chrominance information preceded by a marker flag. The flag preceding the first line block in a video block is a field flag which identifies the beginning of a scanning field associated with that video block. The flags preceding other line blocks in that video block identify the other line blocks respectively. Each flag contains a unique data preamble which identifies the associated line block. Illustratively, field flag data includes unique header, field number, and "performance index" data for controlling data quantization. Line block flag data includes unique header, line block number and performance index data.

Apparatus for synchronizing main and auxiliary video signals

The synchronization method, consists in transmitting, in addition to the data: inter-block separators, for separating the data corresponding to separate blocks, each inter-block separator comprising: a fixed radical, a first binary word representing the rank of a block of picture elements associated with this separator, and a second binary word representing the sum of this rank and of the number of events which are encoded by the data corresponding to the block associated with this separator; picture separators, for separating the data corresponding to successive pictures, each picture separator being repeated several times and comprising a fixed radical followed by a binary word indicating the rank of the separator in the repetitions; synchronization patterns at the picture line frequency and synchronization patterns at the picture frequency, transmitted while interrupting the transmission of the data and of the separators. application to the transmission of digital video pictures on an asynchronous channel.

Synchronization method for the transmission, of an asynchronous channel, or a series of pictures encoded by means of a variable length code, and device for the implementation of this method

The invention relates to an adaptive method for coding and decoding a series of images by transformation, the coding comprising: dividing each image into image element frames, each frame being represented by a frame of luminance values, a frame of blue color difference values, and a frame of red color difference values; applying a bi-dimensional cosine transformation to each frame of values in order to obtain a frame of transformation coefficients; transmitting for each frame of values, either the value of the coefficients of transformation of the frame, or the value difference of these transformation coefficients, with respect to the value of the transformation coefficients of the homologous frame in the preceding image; multiplying the transformation coefficients and the differences of transformation coefficients, before the transmission, by a weighting coefficient favouring the low spatial frequencies and by a quantification coefficient, theses two coefficients being variable as a function of the filling of the buffer memory wherein are simultaneously stored coded data corresponding to the luminance values, to the blue color difference values and to the red color difference values. Application to the reduction of flow rate for the transmission of a series of television images.

Adaptive method of transform coding and decoding a sequence of pictures, and devices for carrying out this method

L'invention concerne un procede de synchronisation, consistant a transmettre, en plus des donnees : The invention relates to a synchronization method, of transmitting, in addition to data: - des separateurs inter-blocs, pour separer les donnees correspondant a des blocs distincts, chaque separateur inter-blocs comportant : un radical fixe, un premier mot binaire traduisant le rang d'un bloc d'elements d'image associe a ce separateur, et un second mot binaire traduisant la somme de ce rang et du nombre des evenements qui sont codes par les donnees correspondant au bloc associe a ce separateur ; - the inter-block separators, for separating the data corresponding to distinct blocks, each inter-block separator comprising: a fixed radical, a first binary word representing the rank of a pixel block associated with this separator, and a second binary word representing the sum of this rank and of the number of events which are coded by the data corresponding to the block associated with this separator; - des separateurs d'images, pour separer les donnees correspondant a des images successives, chaque separateur d'images etant repete plusieurs fois et comportant un radical fixe suivi d'un mot binaire indiquant le rang du separateur dans les repetitions ; - the image separators, for separating the data corresponding to successive images, each image separator is repeated several times and having a fixed radical followed by a binary word indicating the rank of the separator in the repetitions; - des motifs de synchronisation a la frequence des lignes d'image et des motifs de synchronisation a la frequence des images, transmis en interrompant la transmission des donnees et des separateurs. - synchronization patterns at the frequency of the image lines and synchronization patterns at the frequency of the images transmitted by interrupting data transmission and separators. Application a la transmission d'images video numeriques sur un canal asynchrone. Application to the transmission of digital video over an asynchronous channel.

Method of synchronizing, for transmission, on an asynchronous channel, a sequence of pictures coded with a variable-length code, and device for carrying out this method

The invention relates to a synchronization method comprising the transmission of, in addition to data, inter-frame separators, in order to separate the data corresponding to distinct frames, each inter-frame separated comprising a fixed radical, a first binary word translating the rank of a frame of image elements associated with such separator, and a second binary word translating the sum of said rank with the number of events which are coded by the data corresponding to the frame associated to the separator; image separators for separating the data corresponding to successive images, each image separator being repeated a plurality of times and comprising a fixed radical followed by a binary work indicating the rank of the separator in the repetitions; synchronization patterns at the frequency of image lines and synchronization patterns at the frequency of the images, transmitted by interrupting the transmission of data and of the separators. Application to the transmission of digital video images on an asynchronous channel.

Eric Auvray

Papers

Synchronization method for the transmission, of an asynchronous channel, or a series of pictures encoded by means of a variable length code, and device for the implementation of this method

Adaptive method of transform coding and decoding a sequence of pictures, and devices for carrying out this method

Method of synchronizing, for transmission, on an asynchronous channel, a sequence of pictures coded with a variable-length code, and device for carrying out this method

Synchronization device and method for the transmission of a series of images coded by means of a variable length code

Adaptive method and device for coding and decoding a series of images by transformation