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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Применить Всего найдено 5. Отображено 5.
30-10-2013 дата публикации

Selection of image encoding mode based on preliminary prediction-based encoding stage

Номер: GB0002501495A
Автор: LASSERRE SA BASTIEN [FR], LEANNEC FABRICE LE [FR], LASSERRE SA BASTIEN, LEANNEC FABRICE LE, SA©BASTIEN LASSERRE, FABRICE LE LEANNEC
Принадлежит:

A method for encoding blocks of image pixels, which may form an ultra-high definition image 101, comprises: providing a preliminary prediction-based encoding 106 of original blocks, comprising obtaining a preliminary prediction residual image portion resulting from the difference between the original blocks and corresponding predictors; segmenting the preliminary prediction residual image portion into preliminary prediction residuals; and providing a second prediction-based encoding of original blocks. The second prediction-based encoding involves choosing a coding mode to apply to each prediction residual, from among several coding modes including a static coding mode 111 and a probabilistic coding mode 112A. The static coding mode implements quantization using only predefined quantizers, which may be user-defined, and the probabilistic coding mode implements quantization using quantizers selected based on statistics 117 on the preliminary prediction residuals. Selection of the optimal ...

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Номер записи: 1
04-09-2013 дата публикации

Encoding and decoding methods and devices that select pixel transform coefficients based on image frame and block merits

Номер: GB0002499844A
Автор: LASSERRE SA BASTIEN [FR], LEANNEC FABRICE LE [FR], LASSERRE SA BASTIEN, LEANNEC FABRICE LE, SA©BASTIEN LASSERRE, FABRICE LE LEANNEC
Принадлежит:

A method for encoding a video sequence, comprising at least one frame having plural blocks of pixels, comprises: determining a frame merit (e.g. determined based on a fixed relationship between luminance frame and colour frame distortions) and a distortion at the frame level such that a video merit (e.g. using peak-signal-to-noise ratio), computed based on the distortion and frame merit, corresponds to a target video merit; determining, for each block of the plurality, a block merit for the concerned block based on the frame merit; transforming, pixel values for the block into a set of coefficients each having a coefficient type; selecting coefficient types based, for each coefficient, on an initial coefficient type encoding merit and on the block merit for the concerned block (e.g., if the coefficient type merit is greater than the block merit); quantizing the selected coefficients into quantized symbols; and encoding the quantized symbols. A broadly equivalent decoding method is also ...

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Номер записи: 2
30-10-2013 дата публикации

Encoding an image signal using quantizers based on statistics relating to the image signal

Номер: GB0002501493A
Автор: LASSERRE SA BASTIEN [FR], LEANNEC FABRICE LE [FR], LASSERRE SA BASTIEN, LEANNEC FABRICE LE, SA©BASTIEN LASSERRE, FABRICE LE LEANNEC
Принадлежит:

An original encoding method for a unit of pixels of an original image signal (101) is a two-stage probabilistic coding mode. The mode provides a first prediction-based encoding of an original coding unit to obtain a pre-coded coding unit, where the pre-coded coding unit comprises a prediction residual quantized in a frequency domain using predefined quantizers. The mode also provides a second encoding of a quantization residual resulting from the difference between the original coding unit and a decoded version of the obtained pre-coded coding unit. The second encoding includes quantizing in the frequency domain the quantization residual using quantizers selected based on statistics depending on the original image signal (101). A preliminary prediction-based encoding of at least one original encoding unit may be carried out, to generate a preliminary quantization residual from which statistics are obtained. The preliminary prediction-based encoding may involve competing between static coding ...

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Номер записи: 3
04-09-2013 дата публикации

Image encoding and decoding methods quantising pixel transform coefficients based on comparison with a block merit (ratio of distortion benefit to coding cost

Номер: GB0002499841A
Автор: LASSERRE SA BASTIEN [FR], LEANNEC FABRICE LE [FR], LASSERRE SA BASTIEN, LEANNEC FABRICE LE, SA©BASTIEN LASSERRE, FABRICE LE LEANNEC
Принадлежит:

A method for encoding at least one block of pixels comprises the steps of: transforming pixel values for the block into a set of coefficients, each having a coefficient type; determining an initial coefficient encoding merit (i.e., the ratio of a benefit on distortion variation to the cost (rate) variation of encoding) for each coefficient type; quantizing, into quantized symbols, only coefficients for which the initial coefficient encoding merit is greater than a predetermined block merit; and encoding the quantized symbols into encoded data. For each coefficient type, a parameter representing a probabilistic distribution of coefficients having that type can be determined, and the initial encoding merit may be determined based on the parameter. Also claimed is a pixel block data decoding method comprising: receiving data and flags each associated with a coefficient type and indicative of whether coefficients having the concerned coefficient type are encoded; decoding the data into symbols ...

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Номер записи: 4
04-09-2013 дата публикации

Quantizing and Encoding Pixel Coefficients Based on their Type Encoding Merit (Ratio of Distortion Variation to Rate Variation) and a Block Merit

Номер: GB0002499843A
Автор: LASSERRE SA BASTIEN [FR], LEANNEC FABRICE LE [FR], LASSERRE SA BASTIEN, LEANNEC FABRICE LE, SA©BASTIEN LASSERRE, FABRICE LE LEANNEC
Принадлежит:

At least one frame comprising a plurality of pixel blocks, each block having a block type (e.g. size), is encoded. Initially, pixel values for a block among the plurality of blocks (S2) are transformed (S4) into a set of coefficients each having a coefficient type. A block merit is determined (S12) based on a frame merit and on a number of blocks of the given block type per area unit, and a coefficient encoding merit for each coefficient type is determined (S10). The merits may be a measure of the ratio of distortion (e.g. PSNR) variation to rate variation i.e. a measure of distortion improvement against encoding cost. Some coefficients are selected based on a comparison of the coefficient encoding merit and on the block merit so as to quantize then encode coefficients e.g. if the encoding merit for their type is greater than the block merit. The selected coefficients are quantized into quantized symbols (S18) which are then encoded (S20). Complementary decoding is also disclosed. Residual ...

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Номер записи: 5