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6014095 |
Variable length encoding system
There is provided a high speed variable length coding system having a small hardware scale. This variable length coding system includes a variable length code table, a memory for storing quantized...
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6011873 |
Method and apparatus for lossless compression of signature data
A signature capture device includes a CPU that executes a routine to losslessly compress signature data in realtime such that decompression recovers a legally acceptable replica of the original...
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6009201 |
Efficient table-lookup based visually-lossless image compression scheme
An image compression scheme is disclosed which models the human visual perception system. Using quantization of image error values, according to a visually-lossless scheme, an image can be...
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6009203 |
Method and apparatus for hybrid VLC bitstream decoding
A method and apparatus for decoding variable length code (VLC) data employ a hybrid technique of parsing short-length VLC codes using a binary tree or binary search procedure and parsing longer VLC...
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6009211 |
Hadamard transform coefficient predictor
In an Hadamard transform coefficient predictor for 8-point and/or 8×8-point Hadamard transform, when the transform coefficients of one-dimensional 8-point Hadamard transform are represented by...
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5999655 |
Method and apparatus for transmission of video pictures which are segmented to form maps of picture blocks of variable block sizes
An advanced video compression coding system which employs variable block size transforms to improve the compression efficiency for transmission of video pictures. A picture block segmentation map...
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5991451 |
Variable-length encoding using code swapping
The efficiency of variable-length (VL) encoding data using a defined VL encoding table is characterized and one or more changes to one or more entries of the defined VL encoding table are...
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5974179 |
Binary image data compression and decompression
A method for preprocessing a binary file for data compression under a dictionary-based data compression algorithm takes advantage of redundancy in a two-dimensional binary image. The method...
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5966470 |
Coding apparatus for image compression
A coding apparatus for image compression which includes a transformer that transforms image data into a plurality of transform coefficients arranged in a matrix; a quantizer that quantizes each of...
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5966467 |
System for compressing and decompressing binary representations of dithered images
A method for compression and decompression of dithered images is disclosed. Logical units (tiles) of the binary representation are classified into equivalence classes which are then compressed....
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5963260 |
Macroblock-level partitioned HDTV video decoder and related method
A microblock-level partitioned digital HDTV video decoder for decoding a bit stream consisting of a series of macroblocks of digital video data which are coded in accordance with an MPEG or other...
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5963596 |
Audio decoder circuit and method of operation
A data processing system (10) is disclosed which comprises a microprocessor host (12) coupled to a decoding system (14). A host interface block (18) receives a bit stream and passes bit stream on...
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5956430 |
Image information coding apparatus and method using code amount of a selected pixel block for changing coding parameter
An image information coding apparatus includes a block generator for dividing image information into pixel blocks, each of which consists of a predetermined number of pixels. A block selector...
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5956153 |
Coding method and apparatus
Image coding method and apparatus for improving image quality by controlling amount of encoded image data in variable-length coding. The image encoding apparatus comprising: input unit for...
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5953456 |
Recording apparatus for repetitively recording image data of same frame and reproducing apparatus
Image data of one frame stored in a memory is repetitively read a plurality of times as a still image. The read image data is encoded and recorded. In this case, the image data of one frame is...
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5949912 |
Image coding method and apparatus
A digitized image is divided into blocks and a wavelet transform is performed, producing wavelet blocks which are quantized, scanned into linear sequences, and then coded. The scanning of each...
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5933536 |
Variable length code processor and image processor having an integrated coding/decoding circuit
In a variable length code processor or image processor for encoding data to be coded into a variable length code corresponding to its run length and level, and decoding a variable length code to be...
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5930397 |
Apparatus and method for processing image signal
An image signal processor and an image signal processing method arranged to limit a deterioration in image quality at the time of compression and expansion at a low coding rate. Data of an input...
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5923783 |
Image encoding apparatus and image decoding apparatus
The present invention aims to execute effective compression even in the case where inputted image information has the bit number smaller than that of a pixel value, such as a tag, and besides in...
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5907637 |
Method and apparatus for compressing and decompressing data
A method and an apparatus for compressing and decompressing data employ a splay coding instead of an arithmetic coding to achieve a high speed code entering process. The data compressing apparatus...
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5907638 |
Data compression apparatus, method and system
Conventionally, when compressing data, since data (words) are sequentially retrieved from the head of a dictionary, a large amount of time is required for compression processing. Particularly when...
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5905815 |
Decoding encoded image signals encoded by further transforming transformed DC signals
Image signals are encoded following a spatial decomposition pattern that is based on a selected location within the image. The resulting sequence of sets of encoded image signals may be transmitted...
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5903677 |
Image encoding and recording apparatus
An image coding apparatus which includes a first means for fixing or limiting quantity of code produced by compressively coding a given image data, independent of the image, a second means for...
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5901250 |
Digital coding apparatus and digital coding/decoding apparatus
In a digital coding apparatus or a digital coding and decoding apparatus for image data compression and expansion by means of Huffman coding, a Huffman coding circuit converts a combination of ZERO...
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5896465 |
Reverse prioritized image transmission
A method of enhancing a digital image that was transmitted with a reduced amount of digital data representing the digital image in which the differences between pixels in the digital image before...
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5848192 |
Method and apparatus for digital data compression
A system for processing a stream of digital bit sets, each related to a different subject in a passing array, and including an arrangement for compressing the bit-sets and sending the results to an...
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5847776 |
Method for entropy constrained motion estimation and coding of motion vectors with increased search range
A novel method of improving the motion estimation and coding efficiency of Interframes in a video compression system is disclosed. The method teaches a novel minimization function to be used to...
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5848195 |
Selection of huffman tables for signal encoding
Selecting a Huffman table to encode a set of signals, such as video signals, from a set of predefined Huffman tables. A histogram is generated for the set of signals and used to determine the...
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5832128 |
Picture signal encoding and decoding apparatus
Picture signal encoding and decoding apparatus capable of realizing a satisfactory operation in encoding and decoding a picture image at a stable speed without being restricted to the upper limits...
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5831872 |
Method and system for compressing a video signal using dynamic frame recovery
A video signal is converted into a coefficient signal for each frame in a video image. Each coefficient signal comprises block coefficient signals which represent the pixels in a pixel map block...
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5828791 |
Method for storing and playback of fixed videotexts
In a method for storing and playback of a repertoire of fixed videotexts, in which the videotext is stored by characters in digital form in an electrical memory, the quantity of the data to be...
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5825934 |
Adaptive image coding method and apparatus
An ADCT mode or a standard mode of still image encoding is employed to perform fixed length encoding. According to the present invention, an image processing apparatus includes a circuit for...
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5825830 |
Method and apparatus for the compression of audio, video or other data
A data compression method utilizing a series of rules which are chosen for best compressing selected data. Rules are provided for converting each datum into a binary value, and encoding this binary...
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5822770 |
Memory interfacing method and circuit of variable length decoder for accessing external memory when empty portion of internal memory exceeds a predetermined level
A memory interfacing method for a variable-length decoder and a circuit therefor are provided. The memory interfacing circuit includes a read controller for generating a read chip-enable signal and...
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5812701 |
Variable length coding system having a zig-zag memory
A variable length coder is disclosed having a zig-zag memory for continuously receiving blocks of coefficients while outputting the coefficients in zig-zag scan order. The zig-zag memory has a...
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5809565 |
Method of and device for writing and reading data items in a memory system including a data item memory and a length memory
Data items associated with different locations in a spatial field of locations are written in a memory. The memory comprises a length memory in which for each location there is stored a length code...
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5805737 |
Image signal compressing device
An image signal compressing device has a quantization processing circuit in which DCT coefficients are quantized using a quantization table, and thus, quantized DCT coefficients are obtained. In a...
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5805302 |
Variable length encoding of image data
In this image coding method and apparatus, an image is divided into a plurality of areas. Information indicative of the image is variable length coded into data of, for instance (138×132) symbols....
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5801840 |
Apparatus for decoding codes with less memory capacity
In a modified Huffman (MH) code decoding apparatus, an MH code is composed of a first part and second part. The apparatus includes a code conversion table for outputting a run data in response to...
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5801841 |
Image signal coding apparatus with switching between variable-length coding and fixed-length coding
A pixel block is coded by both of a quadrature transform coding section and a block truncation coding section. A code amount counter determines a first code amount of one-block coded data produced...
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5793896 |
Ordering corrector for variable length codes
A computer-implemented method for encoding symbols of a current message with a variable-length code. According to a preferred embodiment, the statistics of the current message, are analyzed,...
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5793898 |
Data compressing system
In a code compressing system for determining a quantizing step of a image compressing code, a second DCT calculating portion performs a DCT calculation for each element reduced and divided by a...
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5790265 |
Image coding/decoding method and apparatus
Disclosed are an image coding method and apparatus for coding digital image data in a highly efficient manner, and to an image decoding method and apparatus for decoding the data thus coded. Each...
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5784631 |
Huffman decoder
A multi-standard video decompression apparatus has a plurality of stages interconnected by a two-wire interface arranged as a pipeline processing machine. Control tokens and DATA Tokens pass over...
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5784494 |
Method and apparatus for prestoring dequantization information for DCT VLC decoding
A DCT VLC decoding method substantially lessens the computational burden of picture dequantization. The method of decoding variable length code (VLC) data includes the step of receiving a bitstream...
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5778096 |
Decompression of MPEG compressed data in a computer system
MPEG compressed data is decompressed in a computer system by sharing computational decompression tasks between the computer system host microprocessor, the graphics accelerator, and a dedicated...
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5777749 |
Method and device for compressing bit-map data
The present invention relates to a bit-map compressing method and a bit-map compressing device. The bit-map data compressing method includes a main scanning step for scanning bit-map data in a main...
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5764802 |
Encoding image signals using a blur image
An original image is encoded using difference signals that correspond to the difference between the original image and a blur image that approximates the original image. The blur image is generated...
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5764357 |
Zero-run-length encoder with shift register
A zero-run-length encoder for a JPEG compression system comprises an addressable memory for storing 63 input values (quantized AC DCT coefficients), zero-detection logic, a shift register, a value...
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5761438 |
Apparatus for measuring the amount of traffic of a network at a predetermined timing and compressing data in the packet without changing the size of the packet
In a communication method and apparatus, the load of a network is reduced by compressing data or changing the data compression method in accordance with a busy state of the network. A network's...
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