|
Match
|
Document |
Document Title |
|
|
5761345 |
Image processing apparatus suitable for multistage compression
An image processing apparatus initially stores variable length codes corresponding to a significant frequency component, and variable length codes corresponding to a less significant frequency...
|
|
|
5757973 |
Compression of image data seperated into frequency component data in a two dimensional spatial frequency domain
A data compression system decorrelates input data into sets of frequency component data. Different sets of frequency component data are entropy encoded using different coding tables matched to the...
|
|
|
5754232 |
Zig-zag and alternate scan conversion circuit for encoding/decoding videos
A zig-zag and alternate scan conversion circuit for encoding/decoding videos which is structured only by logic circuits using a regularity of scan address patterns, thereby achieving an improvement...
|
|
|
5754696 |
Apparatus for compression-coding image data and method of the same based on quantification and frequency transform coefficient amplitude reduction
An image compression-coding device includes a level conversion circuit for adaptively reducing the amplitude of the quantification coefficient data based on statistical characteristics of the...
|
|
|
5751860 |
Method for compressing and decompressing digital image data
A compressing method consisting of generating a predicted value for the pixel of the digitized image to be compressed based on the values of at least two neighboring pixels is provided. After...
|
|
|
5748790 |
Table-driven statistical decoder
An apparatus and computer-implemented method for decoding code words of an encoded bitstream associated with a variable-length code. According to a preferred embodiment, a processor forms a byte...
|
|
|
5748788 |
Image processing method and apparatus
A noise reduction apparatus in which decoded image data is input to a block division circuit which divides the input image into blocks each consisting of N×N pixels. A process block determination...
|
|
|
5727090 |
Method of storing raster image in run lengths havng variable numbers of bytes and medium with raster image thus stored
The invention implements a run-length file format with improved space-sav qualities. The file starts with a header in ASCII format and includes information such as the file format, maximum X and Y...
|
|
|
5727091 |
Video decoder system
A timing signal generator of an MPEG video decoder is responsive to a picture type signal for selectively generating one of a timing signal for decoding I and P pictures and a timing signal for...
|
|
|
5708732 |
Fast DCT domain downsampling and inverse motion compensation
Downsampling and inverse motion compensation are performed on compressed domain representations for video. By directly manipulating the compressed domain representation instead of the spatial...
|
|
|
5675382 |
Spatial compression and decompression for video
A spatial compression and decompression system for color video data wherein a video stream is generated by a charge-coupled device with red, green and blue pixel elements. In a first compression...
|
|
|
5657416 |
Apparatus for further compressing and recording encoded digital video data streams
An encoded video data re-compressing apparatus further compresses, for further transmission or storage, an encoded video data stream that includes quantization parameters and quantized coefficients...
|
|
|
5654806 |
Code manipulation for a high speed JPEG decoder
A circuit for decoding one non-zero JPEG encoded pixel per clock cycle, the coded word being of variable length. For a pixel with leading zeros, a two stage pipeline is used, the first stage having...
|
|
|
5642437 |
System decoder circuit with temporary bit storage 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...
|
|
|
5623557 |
Method and apparatus for data encoding and data recording medium
A data encoding method apparatus in which the volume of arithmetic-logical operations for calculating the total number of bits required for encoding for adaptive bit allocation in the variable...
|
|
|
5621405 |
Variable-length decoding apparatus using relative address
A variable-length decoding apparatus outputs symbol data corresponding to variable-length data. The data may be presented in units of a block having a predetermined magnitude. The apparatus has a...
|
|
|
5615020 |
System and method for fast huffman decoding
A method is provided for performing statistical decoding if a symbol in a data stream having byte boundaries wherein the symbol may have varying alignments with respect to the byte boundaries. The...
|
|
|
5587798 |
Encoding and decoding methods for use in facsimile
An encoding (or decoding) method, by which raw data of 1 line is converted into, for example, modified Huffman (MH) code (or MH code is converted into raw data) by obtaining a cumulative run-length...
|
|
|
5588075 |
Method and apparatus for encoding and decoding image data
A method and apparatus for encoding and decoding image data in which continuous still images are compressed and decompressed. The apparatus divides a plurality of multivalue image data into blocks...
|
|
|
5579413 |
Picture data encoding method
When transformed and quantized blocks of picture data are encoded, a block being constituted by a matrix of coefficients, the events within each block to be encoded comprise firstly a run...
|
|
|
5572334 |
Variable-length coding device
A variable-length coding device for compressing video data includes a variable-length code memory, which stores predefined and pre-shifted variations of variable-length codes in entries thereof....
|
|
|
5570203 |
Image signal coding device
An image signal coding device capable of attaining a high-speed coding operation without increasing a circuit scale. The image signal coding device includes a DCT section for performing...
|
|
|
5566001 |
Method and apparatus for fax messaging in a selective call receiver system using multiple code-book data compression
A fax selective call receiver system (10) featuring compression of a fax message with an optimal one of a plurality of compression code-books (50). At least a portion (44) of a source document (26)...
|
|
|
5537616 |
Image compressing apparatus
In an image compressing apparatus of this invention, a table of extended MH codes is prepared with respect to combinations of consecutive black/white pixels. When a portion where frequent changes...
|
|
|
5517327 |
Data processor for image data using orthogonal transformation
In a data processor, image data of a pixel matrix is subjected to orthogonal transformation to coefficient data, the coefficient data is quantized with a first quantization table for character...
|
|
|
5481364 |
Apparatus for adaptively generating a decoder table for variable-length codes using a stored coding table
An apparatus for expanding variable-length codes includes a decoder responsive to compressed data, into which quantized data is compressed on the basis of coding table data, for expanding the...
|
|
|
5475502 |
Variable length-adaptive image data compression method and apparatus
Variable length-adaptive image data compression method and apparatus. The statistical characteristic of a frame containing a number of blocks is extracted by blocks and then encoded, so as to...
|
|
|
5465164 |
Image processing method and device for the same
Disclosed is an image processing device which comprises a conversion means for converting an image data to a space frequency component, a quantization means for quantizing the space frequency...
|
|
|
5453788 |
Apparatus for converting encoded data into image data, including data preparing circuit, to allow enlargement or reduction of image
An image processing apparatus includes: a first transforming device for transforming encoded data into discrete cosine transform coefficient data segmented into processing blocks, each block being...
|
|
|
5446806 |
Quadtree-structured Walsh transform video/image coding
Two dimensional data structures are represented by quadtree codes with embedded Walsh transform coefficients. The quadtree code permits both variable block size inherent in quadtrees, and the...
|
|
|
5440404 |
Image signal compression apparatus and method using variable length encoding
A transform unit obtains a discrete cosine coefficient by processing an image signal in a discrete cosine transform fashion per unit of a predetermined data amount. A memory includes therein a...
|
|
|
5430556 |
Quantizing and dequantizing circuitry for an image data companding device
In quantizing and dequantizing circuity for an image data companding device, a selective inputting circuit selects either of image data undergone orthogonal transform and data undergone decoding. A...
|
|
|
5412484 |
Variable rate coder/decoder system
A variable rate coder/decoder system in which a quantizer, under control of a quantization controller, quantizes a signal obtained by subjecting discrete cosine transformation of a difference...
|
|
|
5402244 |
Video signal transmission system with adaptive variable length coder/decoder
Disclosed herein is a system which is capable of providing a high efficient bit rate reduction by selectively employing two or more variable length code tables, depending on the magnitude of the...
|
|
|
5379123 |
Facsimile apparatus having improved coding for transmission of plural images without interruption
A facsimile apparatus for high-speed transmission of a plurality of images. If the last one line of an image data to be transmitted first among the connected images is not an all-white line, an...
|
|
|
5359676 |
Decompression of standard ADCT-compressed document images
A method of improving the appearance of an ADCT decompressed document image while maintaining fidelity with an original document image from which it is derived, the method including the...
|
|
|
5343540 |
Method for detecting positions of consecutive bits set to predetermined codes
A first bit length representing the number of bits set to a predetermined code is found, which occur consecutively starting with the least significant bit of a first word among a plurality of words...
|
|
|
5299019 |
Image signal band compressing system for digital video tape recorder
The image signal band compressing method employs a three-dimensional motion compensating technique, an intraframe and an interframe processes which are alternatively executed. The transfer rate of...
|
|
|
5293252 |
Method of compressing digital image data and device thereof
A method of compressing digital image data and a device thereof of coding digital image data within constant rate data not deteriorating a resolution of an image without regard to a complexity of...
|
|
|
5282256 |
Binary image data coding method having the function of correcting errors derived from coding
An image data coding method for a case where image data are transmitted or filed upon being binary coded includes steps of replacing a predetermined pixel by a predicted value predicted by a...
|
|
|
5268769 |
Image signal decoding system for decoding modified Huffman codes at high speeds
An image signal decoding system for decoding a variable length image data compressed by a modified Huffman code. The decoding object data is cut by a fixed length of 13 bits and the cut data is...
|
|
|
5249066 |
Method and system for writing and reading coded data
A method of writing and reading coded data writes and reads the coded data which are coded by an orthogonal transform coding so that an original image can be restored progressively or sequentially,...
|
|
|
5216516 |
Orthogonal transformation arithmetic unit
An orthogonal transformation arithmetic unit performs a discrete cosine transformation with respect to a digital signal and compresses discrete cosine transformed data by quantizing and...
|
|
|
5206742 |
One-dimensional coding method
A one-dimensional coding method for compressing the amount of image data in facsimile machies and image filing systems. Unlike the prior art one-dimensional coding method which attaches an...
|
|
|
5202770 |
Picture coding apparatus including a coding controller for selecting coding between blocks and frames of image data
A coding controller takes a buffer occupancy at present from a transmission buffer, and a first normalized value evaluating device outputs a first normalized value, independent of a video rate. A...
|
|
|
5189526 |
Method and apparatus for performing image compression using discrete cosine transform
A method and apparatus for performing data compression is disclosed that does not require interpolation of pixel data in order to define image blocks. More specifically, the present invention...
|
|
|
5184229 |
Compression coding device and expansion decoding device for picture signal
A device for coding a picture signal by compression produces, when detected that the amplitude of data which has undergone two-dimensional orthogonal transform and then normalized has overflown,...
|
|
|
5170445 |
Document decompressing system
A code parser decodes coded compressed image information into an intermediate code. A code expander operating asynchronously relative to the code parser decompresses the compressed image...
|
|
|
5150430 |
Lossless data compression circuit and method
A lossless data compression circuit compares a new data string with a set of comparison data, and produces a sequence of codewords representing a sequence of successive, non-overlapping substrings...
|
|
|
5148271 |
Method for transmission of variable length code and apparatus for coding a video signal
A method for transmission of variable length code words is provided in which the variable length code words are allocated into a data storage field not only from the front end of the same but also...
|