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3458results about How to "Increase the compression ratio" patented technology

OFDM signal processing in a base transceiver system

A method and apparatus provides OFDM signal compression for transfer over serial data links in a base transceiver system (BTS) of a wireless communication network. For the uplink, an RF unit of the BTS applies OFDM cyclic prefix removal and OFDM frequency transformation of the baseband signal samples followed by frequency domain compression of the baseband signal samples, resulting from analog to digital conversion of received analog signals followed by digital downconversion, forming compressed coefficients. After transfer over the serial data link, the baseband processor applies frequency domain decompression to the compressed coefficients prior to further signal processing. For the downlink, the RF unit performs frequency domain decompression of the compressed coefficients and applies OFDM inverse frequency transformation of the decompressed coefficients and OFDM cyclic prefix insertion prior to digital upconversion and digital to analog conversion, generating the analog signal for transmission over the antenna.
Owner:INTEGRATED DEVICE TECH INC

Adaptive compression and decompression of bandlimited signals

An efficient method for compressing sampled analog signals in real time, without loss, or at a user-specified rate or distortion level, is described. The present invention is particularly effective for compressing and decompressing high-speed, bandlimited analog signals that are not appropriately or effectively compressed by prior art speech, audio, image, and video compression algorithms due to various limitations of such prior art compression solutions. The present invention's preprocessor apparatus measures one or more signal parameters and, under program control, appropriately modifies the preprocessor input signal to create one or more preprocessor output signals that are more effectively compressed by a follow-on compressor. In many instances, the follow-on compressor operates most effectively when its input signal is at baseband. The compressor creates a stream of compressed data tokens and compression control parameters that represent the original sampled input signal using fewer bits. The decompression subsystem uses a decompressor to decompress the stream of compressed data tokens and compression control parameters. After decompression, the decompressor output signal is processed by a post-processor, which reverses the operations of the preprocessor during compression, generating a postprocessed signal that exactly matches (during lossless compression) or approximates (during lossy compression) the original sampled input signal. Parallel processing implementations of both the compression and decompression subsystems are described that can operate at higher sampling rates when compared to the sampling rates of a single compression or decompression subsystem. In addition to providing the benefits of real-time compression and decompression to a new, general class of sampled data users who previously could not obtain benefits from compression, the present invention also enhances the performance of test and measurement equipment (oscilloscopes, signal generators, spectrum analyzers, logic analyzers, etc.), busses and networks carrying sampled data, and data converters (A / D and D / A converters).
Owner:TAHOE RES LTD

Method and device for image and video transmission over low-bandwidth and high-latency transmission channels

The present invention provides a method for transmission of a images and / or video over bandwidth limited transmission channels having varying available bandwidth, which method comprises the use of a classification algorithm for decomposing the images and / or video to be transmitted into multiple spatial areas, each area having a specific image type; detecting the image type of each of those areas separately selecting for each of those areas an image and / or video encoding algorithm having a compression ratio. The classification algorithm prioritizes each of the areas, the classification algorithm increasing the compression ratio of the image and / or video encoding algorithm dedicated to spatial areas having lower priority in case of decreasing bandwidth.
Owner:BARCO NV

Method for compressing dictionary data

The invention relates to pre-processing of a pronunciation dictionary for compression in a data processing device, the pronunciation dictionary comprising at least one entry, the entry comprising a sequence of character units and a sequence of phoneme units. According to one aspect of the invention the sequence of character units and the sequence of phoneme units are aligned using a statistical algorithm. The aligned sequence of character units and aligned sequence of phoneme units are interleaved by inserting each phoneme unit at a predetermined location relative to the corresponding character unit.
Owner:NOKIA CORP

Method and system for reducing web page download time

In one embodiment web page response time is improved by requesting multiple resources in a batch request, receiving said resources in a batch response, and disjoining the resources and corresponding HTTP headers before caching on the client. The resources are retrieved by web browser from the cache separately without loss of cache granularity. Client parses base page to determine the embedded resources and includes in the batch requests only web addresses those resources that are uncached or may be expired. To reduce required bandwidth, server validates caching information of every resource before sending the batch response. In another embodiment web application performance for mobile users is improved by combining individually requested resources into the batch response on a network node positioned on a link between cellular network and the Internet.
Owner:KLEYZIT VADIM

An enhanced in-frame predictive mode coding method

The present invention belongs to the field of video coding / decoding technology in signal processing, and relates to a predictive pattern coding method in enhancement frame. It is characterized by that utilizing space correlation of texture of adjacent image blocks, according to the relationship of optimum predictive patterns between adjacent blocks statistically defining most-possible predictive pattern list so as to raise the coding predictive accuracy in frame. Said invention also provides the concrete steps of said coding method, and can raise video coding efficiency.
Owner:HUAZHONG UNIV OF SCI & TECH

Method and apparatus for image intra prediction

A method and apparatus for intra prediction of an image having arbitrary directivity are provided. Arbitrary edge directions and amplitudes of the edges based are calculated on neighboring pixels of a prediction block. From the calculated edge directions, a number of intra prediction directions in an order of the amplitudes of the edges is selected. An optimum intra prediction mode is determined by performing block prediction in the selected number of the intra prediction directions.
Owner:SAMSUNG ELECTRONICS CO LTD

Method for Coding RGB Color Space Signal

A method for coding an RGB color space signal is disclosed. In accordance with the method, a base plane is encoded using an independent mode, and an enhanced plane is encoded by referring to the base plane without converting the RGB color space signal into YCbCr color space signal to reduce a redundancy between RGB planes and improve a compression ratio of an image.
Owner:KOREA ELECTRONICS TECH INST

Coding of a syntax element contained in a pre-coded video signal

A method for encoding a syntax element contained in a precoded video signal into a coded bit stream, the precoded video signal representing at least one video frame, the syntax element being associated with a predetermined portion of the video frame and being indicative of as to whether the predetermined portion of the video frame is precoded in a first or a second way into the precoded video signal is described. The method comprises investigating as to whether a neighboring portion of the video frame neighboring the predetermined portion is precoded in the first way or the second way, in order to obtain a binary value; assigning one of at least two context models to the predetermined portion of the video frame based on the binary value, wherein each context model is associated with a different probability estimation; and arithmetically encoding the syntax element into the coded bit stream based on the probability estimation with which the assigned context model is associated.
Owner:FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV

Block noise level evaluation method for compressed images and control method of imaging device utilizing the evaluation method

InactiveUS20060034531A1Reducing influence level of noiseReduce in quantityImage enhancementImage analysisPattern recognitionNoise level
The technique of the invention converts an object RGB image into an image in a YIQ color space, calculates a luminance variation at each target pixel from Y channel values of the target pixel and an adjacent pixel adjoining to the target pixel, and computes a smoothness degree of luminance variation at the target pixel as summation of absolute values of differences between luminance variations at the target pixel and adjacent pixels. A block noise evaluation value B is obtained as a ratio of an average smoothness degree ave(psx), ave(psy) of luminance variation for boundary pixels located on each block boundary to an average smoothness degree ave(nsx), ave(nsy) of luminance variation for inner pixels not located on the block boundary. The block noise evaluation value B closer to 1 gives an evaluation result of a lower level of block noise, whereas the block noise evaluation value B closer to 10 gives an evaluation result of a higher level of block noise.
Owner:SEIKO EPSON CORP

Bi-level iso-surface compression

Methods, structures and systems for encoding and decoding isosurface data. An encoder process takes volume data and an isolevel as input and produces compressed isosurface data as output. The compressed isosurface data produced by an encoder process is composed of an occupancy image record, an optional intersection points record, and an optional normal vectors record. An occupancy image is compressed with a context-based arithmetic encoder. Compressed isosurface data can be stored in a data storage device or transmitted through a communication medium to a remote computer system, where the decoder process is executed. The decoder processes take compressed surface data as input and produce surface data as output. The decoder processes first reconstructs the occupancy image by decoding the occupancy image record. An in-core isosurface decoder process produces a polygon mesh as a surface representation. An out-of-core isosurface decoder process produces a set of oriented points as a surface representation.
Owner:ACTIVISION PUBLISHING

Digital camera device and methodology for distributed processing and wireless transmission of digital images

A digital imaging system is described that provides techniques for reducing the amount of processing power required by a given digital camera device and for reducing the bandwidth required for transmitting image information to a target platform. The system defers and / or distributes the processing between the digital imager (i.e., digital camera itself) and the target platform that the digital imager will ultimately be connected to. In this manner, the system is able to decrease the actual computation that occurs at the digital imager. Instead, the system only performs a partial computation at the digital imager device and completes the computation somewhere else, such as at a target computing device (e.g., desktop computer) where time and size are not an issue (relative to the imager). By deferring resource-intensive computations, the present invention substantially reduces the processor requirements and concomitant battery requirements for digital cameras. Further, by adopting an image strategy optimized for compression (compressed luminosity record), the present invention decreases the bandwidth requirements for transmitting images, thereby facilitating the wireless transmission of digital camera images.
Owner:RPX CORP

Method of encoding digital signals (variants), method of decoding digital signals (variants), device for implementation thereof (variants), and system for image transmission via limited throughput communication channels (variants)

The invention relates to systems for a transmission of images via channels of communication with a limited capacity by means of application of compression of the images. The technical result consists in an increase of the compression degree upon encoding, and it allows to fulfill the transmission of such encoded images via the channel of communication with the limited capacity, therewith a high degree of the compression is provided without of increase of computational power of encoding device and without of distortions upon decoding. The result is obtained by the usage of more effective method of interpolation of restored subsamples, in this method there is used an adaptive and applicative set of samples, which restore a quantized signal, and this set of the samples allows to improve an accuracy of the interpolation with a number of the subsamples, which is necessary for the right interpolation that is simultaneously decreased one.
Owner:SIF CODEC

Scalable video coding using derivation of subblock subdivision for prediction from base layer

ActiveUS20150195566A1Improving available qualityMotion-compensated predictionColor television with pulse code modulationColor television with bandwidth reductionData streamVideo encoding
Scalable video coding is rendered more efficient by deriving / selecting a subblock subdivision to be used for enhancement layer prediction, among a set of possible subblock subdivisions of an enhancement layer block by evaluating the spatial variation of the base layer coding parameters over the base layer signal. By this measure, less of the signalization overhead has to be spent on signaling this subblock subdivision within the enhancement layer data stream, if any. The subblock subdivision thus selected may be used in predictively coding / decoding the enhancement layer signal.
Owner:GE VIDEO COMPRESSION LLC

Method and apparatus for processing three-dimensional images

A 3D image processing apparatus first generates a combined view volume that contains view volumes set respectively by a plurality of real cameras, based on a single temporary camera placed in a virtual 3D space. Then, this apparatus performs skewing transformation on the combined view volume so as to acquire view volumes for each of the plurality of real cameras. Finally, two view volumes acquired for the each of the plurality of real cameras are projected on a projection plane so as to produce 2D images having parallax. Using the temporary camera alone, the 2D images serving as base points for a parallax image can be produced by acquiring the view volumes for the each of the plurality of real cameras. As a result, a processing for actually placing the real cameras can be skipped, so that a high-speed processing as a whole can be realized.
Owner:SANYO ELECTRIC CO LTD

Bi-level iso-surface compression

Methods, structures and systems for encoding and decoding isosurface data. An encoder process takes volume data and an isolevel as input and produces compressed isosurface data as output. The compressed isosurface data produced by an encoder process is composed of an occupancy image record, an optional intersection points record, and an optional normal vectors record. An occupancy image is compressed with a context-based arithmetic encoder. Compressed isosurface data can be stored in a data storage device or transmitted through a communication medium to a remote computer system, where the decoder process is executed. The decoder processes take compressed surface data as input and produce surface data as output. The decoder processes first reconstructs the occupancy image by decoding the occupancy image record. An in-core isosurface decoder process produces a polygon mesh as a surface representation. An out-of-core isosurface decoder process produces a set of oriented points as a surface representation.
Owner:ACTIVISION PUBLISHING

Wireless terminal dynamically programmable proxies

InactiveUS20060013235A1Web contentImprove file transfer timeInformation formatData switching by path configurationNetwork connectionTranscoding
The present invention relates to scheduling, compression and transcoding of data content for mobile terminals with limited resources. The present invention provides a method of transferring information or content to or from a terminal dependent on a number of parameters associated with the terminal. Such parameters might include its battery level, processing resource status and memory resource status, and the nature of its connection(s) to the network(s) (network performance). Thus for example a terminal with plenty of processor resources but a single narrowband wireless link may implement a high compression ratio in order to improve the file transfer time to the terminal, even if this requires a high de-compression processing overhead. Such a set-up may be changed during a connection session, for example if the battery runs low necessitating reduced processing. In preferred embodiments this method of transferring content is implemented using a programmable or dynamically adaptable proxy device which adjusts the transcoding and / or compression, as well as its scheduling or rate and timing of transfer of the transcoded / compressed information to and from the terminal over one or more network connections.
Owner:KK TOSHIBA

System for broadcasting multimedia content

The invention relates to a telecommunication system for broadcasting multimedia content (MM) to a client device (60). Said system comprises an encoder (20) for encoding said multimedia content in an encoded data stream (EDS). Said encoded data stream is transmitted via a first network connection (30) to a server (40). Said server (40) is able to generate metadata (MT) from media data (MD) contained in the received encoded data stream (EDS) and to create a progressive file (PF), in which said media data (MD) and metadata (MT) are interleaved. Said progressive file (PF) is downloaded via a second network connection (50) to a client device (60), which is able to start playing the received multimedia content before the end of the download, using said interleaved meta and media data.
Owner:NXP BV

Advance video coding with perceptual quality scalability for regions of interest

ActiveUS20120177121A1Amenable to multithread/multi-processor architecturesEfficient compressionImage enhancementImage analysisObject motionMotion parameter
A video compression framework based on parametric object and background compression is proposed. At the encoder, an object is detected and frames are segmented into regions corresponding to the foreground object and the background. The encoder generates object motion and appearance parameters. The motion or warping parameters may include at least two parameters for object translation; two parameters for object scaling in two primary axes and one object orientation parameter indicating a rotation of the object. Particle filtering may be employed to generate the object motion parameters. The proposed methodology is the formalization of the concept and usability for perceptual quality scalability layer for Region(s) of Interest. A coded video sequence format is proposed which aims at “network friendly” video representation supporting appearance and generalized motion of object(s).
Owner:STMICROELECTRONICS INT NV

Multiple Combustion Mode Engine Using Direct Alcohol Injection

ActiveUS20080127933A1Improve operation and transient performanceDesign range be expandAnalogue computers for vehiclesElectrical controlAutomotive engineeringSpark-ignition engine
A method of operating an engine, comprising of performing homogeneous charge compression ignition combustion during a first operating condition, and performing spark ignition combustion during a second operating condition, where an amount of directly injected alcohol in at least one of said homogeneous charge compression ignition combustion and said spark ignition combustion is varied in response to at least an operating parameter.
Owner:FORD GLOBAL TECH LLC +1

Image data compression employing multiple compression code tables

An image data compression and decompression technique applies one or more compression code tables to optimally compress an image data stream. The compression code tables are established in accordance with anticipated image characteristics, and to accommodate different levels of variation or entropy in the image data. The image data may be divided into blocks or subregions for analysis of which of the candidate compression code tables provides the optimal compression of each subregion. The appropriate code table is selected for each subregion. The evaluation of the compression performance based upon application of each compression code table may include analysis of prediction differences or errors between predicted values for pixels of an image and the actual values for the pixels.
Owner:GENERAL ELECTRIC CO

Method and apparatus for video data encoding and decoding

Video data encoding and decoding methods and apparatuses are provided. In the video data encoding and decoding methods, codes books are provided to an encoder and a decoder. In the encoder, an index corresponding to a vector that is most similar to a current vector of an input moving picture among the vectors of the code book is encoded. In the decoder, the index is decoded. Accordingly, it is possible to increase compression ratio and reduce calculation complexity.
Owner:ELECTRONICS & TELECOMM RES INST +1

Real-time image compression and reduction method based on plurality of palettes

The invention discloses a real-time image compression and reduction method based on a plurality of palettes. The real-time image compression and reduction method comprises the following steps of: preassembling and fixing the palettes, cutting a source image into blocks with a fixed size, reading an RGB (Red-Green-Blue) color value of each pixel point of each block, then carrying out color space transformation on the color values, and carrying out statistics on color systems of the images by a color histogram based on main colors; then carrying out color value matching according to color system palettes corresponding to the color systems, and finding the best palette; then replacing the value of each pixel point of the image into an index number of the palettes, and carrying out recompression on the indexed data, thus reaching a higher compression rate; and in transmission on a network, only transmitting the indexed data after compression without transmitting palette data of the color systems, thus achieving the purpose of reducing transmission of data amount. A receiving end only needs to decompress the data, obtain the indexed data, then carry out image data reduction according to the palettes of the local color system and then display the data.
Owner:G NET INTEGRATED SERVICE

Code compression algorithms and architectures for embedded systems

Code compression techniques and decompression architectures for embedded systems are disclosed, providing good compression ratio while improving decompression time for VLIW instructions and reducing bus power consumption. The invention includes two fixed-to-variable (F2V) length code compression schemes based on a reduced arithmetic code compression algorithm combining arithmetic coding with probability models; a static probability model using static coding and semi-adaptive coding using a Markov model. Multi-bit decompression methods for the F2V techniques are presented, together with a parallel decompression scheme that tags and divides a compressed block into smaller sub-blocks. The Markov model provides better compression ratio, but the static model has a less complicated decompression unit design. The invention also includes two variable-to-fixed (V2F) length coding algorithms, one based on Tunstall coding and another on arithmetic coding. The V2F algorithms are also combined with a static model and a Markov model.
Owner:THE TRUSTEES FOR PRINCETON UNIV
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