939 results about "Lossless compression" patented technology

An memory module including parallel data compression and decompression engines for improved performance. The memory module includes MemoryF/X Technology. To improve latency and reduce performance degradations normally associated with compression and decompression techniques, the MemoryF/X Technology encompasses multiple novel techniques such as: 1) parallel lossless compression/decompression; 2) selectable compression modes such as lossless, lossy or no compression; 3) priority compression mode; 4) data cache techniques; 5) variable compression block sizes; 6) compression reordering; and 7) unique address translation, attribute, and address caches. The parallel compression and decompression algorithm allows high-speed parallel compression and high-speed parallel decompression operation. The memory module-integrated data compression and decompression capabilities remove system bottlenecks and increase performance. This allows lower cost systems due to smaller data storage, reduced bandwidth requirements, reduced power and noise.

A method, information processing system, and computer program storage product store data in an information processing system. Uncompressed data is received and the uncompressed data is divided into a series of vectors. A sequence of profitable bitmask patterns is identified for the vectors that maximizes compression efficiency while minimizes decompression penalty. Matching patterns are created using multiple bit masks based on a set of maximum values of the frequency distribution of the vectors. A dictionary is built based upon the set of maximum values in the frequency distribution and a bit mask savings which is a number of bits reduced using each of the multiple bit masks. Each of the vectors is compressed using the dictionary and the matching patterns with having high bit mask savings. The compressed vectors are stored into memory. Also, an efficient placement is developed to enable parallel decompression of the compressed codes.

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).

Embodiments include implementing a remote display system (either wired or wireless) using a standard, non-custom codec. In this system, the decoder side can be fully implemented using an existing standard from a decode/display point of view and using a single stream type. The encoder side includes a pre-processing component that analyzes screen images comprising the video data to determine an amount of difference between consecutive frames of the screen images, divides each screen image into a plurality of regions, including no change regions, high quality regions, and low quality regions. The pre-processor characterizes each region as requiring a minimum quality level, encodes the low quality regions for compression in accordance with the H.264 encoding standard; and encodes the high quality regions using the lossless compression scheme of the H.264 standard. A no change region is encoded using a version of the H.264 encoding standard that adaptively and dynamically selects between lossless and lossy compression in a manner that optimizes efficiency of the compression operation.

An audio-on-demand communication system provides real-time playback of audio data transferred via telephone lines or other communication links. One or more audio servers include memory banks which store compressed audio data. At the request of a user at a subscriber PC, an audio server transmits the compressed audio data over the communication link to the subscriber PC. The subscriber PC receives and decompresses the transmitted audio data in less than real-time using only the processing power of the CPU within the subscriber PC. According to one aspect of the present invention, high quality audio data compressed according to lossless compression techniques is transmitted together with normal quality audio data. According to another aspect of the present invention, metadata, or extra data, such as text, captions, still images, etc., is transmitted with audio data and is simultaneously displayed with corresponding audio data. The audio-on-demand system also provides a table of contents indicating significant divisions in the audio clip to be played and allows the user immediate access to audio data at the listed divisions. According to a further aspect of the present invention, servers and subscriber PCs are dynamically allocated based upon geographic location to provide the highest possible quality in the communication link.

Digitalized video images are compressed in several steps in order to provide a system for transmitting moving video pictures via narrow band channels, such as the telephone network. The system is based on any extension of the bit-plane coding technique to video sequences and lossy conditions. The compression technique can also be advantageously used in a lossless compression system. The system involves the steps of bit plane representation and skipping the least significant bit plane(s), shifting the pixels, coding with a Gray code, the use of segmentation, and motion-estimation/motion compensation and application of a transmit/not transmit/motion compensate (TX/NT/MC) procedure, exploiting of the temporal redundancy of two corresponding bit planes via an XOR operation on two successive images, and a plane-by-plane application of an extended RLEID technique. The RLEID technique includes coding a run of like binary symbols with one word, the run including a transition between the penultimate and ultimate binary symbol.

An image data compression system, for compressing a frame represented as a plurality of blocks, can include: a lossless compression unit to receive the plurality of blocks and to perform lossless compression thereon resulting in a first code; a lossy compression unit to receive the plurality of blocks and to perform lossy compression thereon resulting in a second code; and a code selection circuit to selectively output one of the first and second codes based upon a figure of merit evaluated for at least one of the first and second codes.

Methods and apparatuses for still image compression, video compression and automatic target recognition are disclosed. The method of still image compression uses isomorphic singular manifold projection whereby surfaces of objects having singular manifold representations are represented by best match canonical polynomials to arrive at a model representation. The model representation is compared with the original representation to arrive at a difference. If the difference exceeds a predetermined threshold, the difference data are saved and compressed using standard lossy compression. The coefficients from the best match polynomial together with the difference data, if any, are then compressed using lossless compression. The method of motion estimation for enhanced video compression sends I frames on an "as-needed" basis, based on comparing the error between segments of a current frame and a predicted frame. If the error exceeds a predetermined threshold, which can be based on program content, the next frame sent will be an I frame. The method of automatic target recognition (ATR) including tracking, zooming, and image enhancement, uses isomorphic singular manifold projection to separate texture and sculpture portions of an image. Soft ATR is then used on the sculptured portion and hard ATR is used on the texture portion.

A radiologist workstation program capable of performing the methods of: (a) losslessly compressing an image by using a sample of pixel neighborhoods to determine a series of predictive coefficients values related to the pixel neighborhoods; (b) lossy compressing an image to a predetermined ratio by adjusting the quality parameter in a quality controlled compression routine; (c) adjusting the compression ratio of image data based upon the available bandwidth of a network link across which the image is transmitted; (d) encapsulating audio data in a DICOM object and selectively retrieving the data; (e) performing an improved integer based ray tracing method by establishing a ray angle from an observer position and adjusting the ray angle such that the directional components of the ray angle are rational numbers; and (f) reducing flicker caused by a magnifying window moving across an image on the display screen by determining what portion of a first window position is not covered by a new window position and restoring from memory that portion of the image which corresponds to the portion of the first window not covered by the second window.

One embodiment of the present invention sets forth a technique for lossless compression of color data. Color data for a packet including multiple sub-pixel samples is compressed using a predictor map that is selected based on the sampling format specified for the graphics surface storing the color data. The predictor map defines one of the samples as an anchor that is represented exactly and a transform indicating which neighboring samples are used to compute difference samples for the other samples in the packet. The difference samples are truncated and tested to determine if the difference samples can fit into one or more compressed data formats, i.e., if the color data can be compressed without loss. When compression can be performed without loss, the transformed packet is output. Otherwise, the original packet is output.

A generally lossless compression system suitable for compression of data in a real-time, remote monitoring application is disclosed. In one embodiment, the real-time monitoring application is subject to a fixed-delay transmission constraint. In one implementation, a specific set partitioning method (e.g., binary tree partitioning) is employed on blocks of data that are wavelet transformed in a reversible manner so that encoded blocks may be transmitted losslessly or truncated and transmitted with some loss.

The invention relates to a real time data compressing method, for compressing in-data packet data in a process control system, where the real time data comprises numerical values of analogue quantities and the method comprises: 1) initializing a dictionary, i.e. initializing characters that possibly occur during compressing into a dictionary; 2) reading in numerical valves; 3) making subtraction of adjacent data to obtain difference values and storing the first read-in numerical value in compressed files; 4) adopting LZW algorithm to compress the difference values. The invention realizes the lossless compression of real time data and the compressing course is safe and reliable. The invention has very good rapidness and can meet the requirements of real time databases and raises the history data inquiring efficiency.

The invention relates to a video intraframe lossless encoding and decoding method based on interleaving prediction and the system thereof, and belongs to the technical field of the video encoding and decoding for signal processing. In the encoder end, each intra-frame coding frame (I frame) is down-sampled to form four subimages in certain sequence, encoding based on standard prediction is adopted for the first subimage, and decoding based on the interleaving prediction is adopted for the three subsequent subimages in sequence; in the decoder, each received I frame code stream is used for decoding the code stream of the first subimage section according to the standard prediction, and decoding the code stream of the three subsequent subimages on the basis of the pixel level interleaving prediction, and finally up-sampling combination is performed to the four decoded subimages to obtain I frame decoding image. Compared with the standard prediction method, the interleaving prediction method of the invention is provided with better prediction performance, thereby improving the video intraframe lossless compression performance.

Exemplary embodiments are described herein whereby blocks of data are losslessly compressed and decompressed using a nested hierarchy of fixed phrase length dictionaries. The dictionaries may be built using information related to the manner in which data is commonly organized in computer systems for convenient retrieval, processing, and storage. This results in low cost designs that give significant compression. Further, the methods can be implemented very efficiently in hardware.

The present invention is a method and apparatus for compressing and decompressing data. In particular, the present invention provides for (de-)compressing naturalistic color-image and moving-image data, including high-precision and high-definition formats, with zero information loss, one-sample latency and in faster than real time on common computing platforms, resulting in doubled transmission, storage, and playback speed and doubled transmission bandwidth and storage capacity, and hence in doubled throughput for non-CPU-bound image-editing tasks in comparison with uncompressed formats. The present invention uses a nearly symmetrical compression-decompression scheme that provides temporal, spatial, and spectral compression, using a reversible condensing/decondensing filter, context reducer, and encoder/decoder. In the preferred embodiment of the invention, the compression filter is implemented as a cascade of quasilinear feedforward filters, with temporal, multidimensional spatial, and spectral stages, where appropriate, in that order, whose support consists of adjacent causal samples of the respective image. The decompressor cascades quasilinear feedback inverse filters in the reverse order. The filters can be implemented with mere integer addition, subtraction, and either one-dimensional table lookup or constant multiplication and binary shifting, depending on the computing environment Tables permit the data precision to be constrained throughout to that of the image samples. The encoder uses a table of prefix codes roughly inversely proportional in length to their probability, while the decoder uses chunked decode tables for accelerated lookup. In the fastest and simplest mode, the code tables are context-independent. For greater power, at the cost of a reduction in speed, the code tables are based on the temporal, multidimensional spatial, and spectral adjacent causal residue samples, where contexts with similar probability distributions are incoherently collapsed by a context reducer using one-dimensional lookup tables followed by implicitly multidimensional lookup tables, to minimize the overall table size. The invention's minimal resource requirements makes it ideal for implementation in either hardware or software.

A low cost camera by implementing the major functions in host software is provided. This is accomplished by sending raw, digitized data from the camera directly to the host. The increased volume of raw data is handled by either an improved compression/decompression scheme using lossless compression, using lossy compression or using a shared bus with higher bandwidth. By moving such functions as color processing and scaling to the host, the pixel correction can also be moved to the host. This in turn allows the elimination of the frame buffer memory from the camera. Finally, the camera can use a low cost lens by implementing vignetting, distortion, gamma or aliasing correction with a correction value stored in a register of the camera for later access by the host to perform corrections.

The invention discloses an intra-frame lossless compression coding method based on an HEVC (high efficiency video coding) frame, wherein the method is low in time complexity and high in prediction accuracy and increases compression ratio. By the aid of the HEVC frame, a coding unit can be adaptively divided according to image flatness, the best division scheme is determined, and the optimal prediction mode is selected. DPCM (differential pulse code modulation) differential codes are used for preliminary prediction, prediction errors are possibly large when only the differential codes are used for an area with complex texture, and accordingly, prediction values are corrected for the area by means of error compensation. By combining the two methods, reduction of time complexity and improvement of prediction accuracy can be effectively compromised. Distribution characteristics of residual errors depend on the prediction mode, so that the scanning sequence of the residual errors is determined according to the prediction mode, and entropy coding can be more effective.

This invention reduces degradation in quality of a resized image in obtaining the resized image. An image capturing apparatus includes an image sensor which converts an optical image into an electrical signal, an A/D conversion unit which converts an image signal output from the image sensor into digital image data, a color interpolation unit which executes color interpolation of the digital image data, a separation unit which separates the digital image data that has undergone color interpolation by the color interpolation unit into a luminance component and color difference components, an image size conversion unit which converts the image size of the luminance component and color difference components, and a lossless compression unit which losslessly compresses the luminance component and color difference components generated by the image size conversion unit.

A document data display system uses document data composed of text and image portions and layout information and creates from it compressed document data by lossless compressing the text portion and lossless or lossy compressing the image portion in order to reduce traffic in communication. A document data display device 1 expands text or image portions from received compressed document data at a text expansion unit or an image expansion unit, and uses the analysis of the layout information by a layout information analyzing unit to arrange the text or image portions at a development unit before being displayed by a display unit.