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6404931 |
Code book construction for variable to variable length entropy encoding
A method of constructing a code book for groupings of symbols drawn from an alphabet, in which variable-sized groups of symbols are each assigned a variable length code based on probability of...
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6404919 |
Image processor for encoding image data
In an image processor, a decider decides based on image data of pixels included in a block whether the block has character attribute of non-character attribute, a first encoder encodes the image...
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6393154 |
Method and apparatus for digital image compression using a dynamical system
Digital images are transformed using a set of filters derived from the evolving states of cellular automata. In accordance with a preferred embodiment, the ensuing transform coefficients are...
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6389160 |
Hybrid wavelet and JPEG system and method for compression of color images
A data encoder and method encodes color image data. The image data include Y, U and V data. A data image quality level is selected, which corresponds to a compression ratio. The Y data is encoded...
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6381368 |
Image processing apparatus and method
When a region obtained by predetermined region division processing is a character image, the image is converted at one of predetermined compression ratios (S 505 ). Data in a certain information...
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6377709 |
Process for coding with region information
The process for the compression of digital data from a video image which carries out a partitioning ( 4 ) of the image into image blocks, a Discrete Cosine Transformation ( 9 ) of these blocks so...
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6373890 |
Video compression and playback process
Color video data is compressed by storing only the most frequently occurring colors in a block of pixel data. A minimum number of colors for the block is determined determining when colors in a...
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6366705 |
Perceptual preprocessing techniques to reduce complexity of video coders
A method of encoding a video sequence including a sequence of video images includes comparing elements of a portion of a first video image with elements of a portion of a second video image to...
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6366704 |
Method and apparatus for a delay-adaptive rate control scheme for the frame layer
A digital video encoder and method for its operation are disclosed. This encoder comprises a frame-layer rate controller that bases a rate-distortion-optimized target bit assignment T j on an...
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6360017 |
Perceptual-based spatio-temporal segmentation for motion estimation
A method of encoding a video sequence including a sequence of video images includes first comparing elements of a portion of a first video image (e.g., pixels of a macroblock of a current frame)...
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6356666 |
Image compressing/expanding method and image compression expanding device
On the image compression side, each lossless wavelet transformation coefficient on which a lossless wavelet transformation for an image is effected, is first subjected to quantization and entropy...
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6356664 |
Selective reduction of video data using variable sampling rates based on importance within the image
In a reduction process, data in portion buffers are selectively sampled at different sampling rates proportional to their assigned weights. For instance, portions assigned highest weights could be...
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6356668 |
Method for efficient rate control
An efficient method for determining the compressed rate of a digital image with a given set of compression parameters, the method comprises the steps of forming a plurality of non-overlapping image...
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6356663 |
Processing image signals using spatial decomposition
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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6353683 |
Method and apparatus of image processing, and data storage media
An image processing method in which an input image signal is coded for each of unit areas into which a frame is divided and a coded image signal is output, and a prediction image signal for a...
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6351491 |
Apparatus and method for optimizing the rate control for multiscale entropy encoding
A method and apparatus for recursively optimizing the rate control of a hierarchical subband coding system that offers spatial, quality and/or complexity scalabilities. The rate control method...
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6351567 |
Efficient encoding of video blocks
A method for encoding video blocks. In one embodiment of the invention, a detector, which compares an observation value associated with each block in a video sequence to a probabilistic threshold...
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6351568 |
Image transform and significance bit-plane compression and decompression
A method of representing a digital image to provide a coded representation is disclosed. The digital image is divided into a number of blocks of pixels and each block is transformed to derive a...
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6347151 |
Image signal converting/encoding method and apparatus
An image signal expressing pel values and a significance signal declaring for each pel whether the pel value is significant are supplied as input signals. By referring to the input significance...
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6345125 |
Multiple description transform coding using optimal transforms of arbitrary dimension
A multiple description (MD) joint source-channel (JSC) encoder in accordance with the invention encodes n components of a signal for transmission over in channels of a communication medium. In...
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6343153 |
Coding compression method and coding compression apparatus
A coding compression method for encoding the video image signal with a variable bit rate includes performing coding to the video image signal for each predetermined coding unit in accordance with a...
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6339657 |
Image compression of a facial region by adaptive quantization based on resolution
An image data coding and/or decoding system according to the present invention has an input terminal for inputting an image data signal, a screen-area determining section for determining the area...
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6337929 |
Image processing apparatus and method and storing medium
A system which can efficiently compress any one of a multivalue image and a binary image and can preferably keep a high picture quality is provided. To accomplish this object, the system has means...
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6333952 |
Decoder for digital TV receiver
A decoder for a digital TV receiver is disclosed. The present decoder improves the picture quality of a video signal down converted when an SD class TV receiver receives an HD class video signal....
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6332042 |
Apparatus and method for encoding and decoding data in a lossy transmission environment
A system and method for encoding at least one section of data is disclosed. A number reflective of a bit stream length of the data for each section of a group is determined. A function of the...
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6330363 |
Apparatus and method for hybrid compression and decompression of raster data
From a raster page, patches of connected pixels of the same color are identified. Patches of at least a predetermined sized, typically corresponding to text or line art objects, are subjected to a...
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6330369 |
Method and apparatus for limiting data rate and image quality loss in lossy compression of sequences of digital images
By limiting the extent to which the degree of quantization is lowered to increase the amount of compressed data, problems of data rate overshoots and image quality degradation in multi layer...
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6327375 |
Ophthalmologic phototaking apparatus
The present invention relates to an ophthalmologic phototaking apparatus having an illuminating system for illuminating an eye to be examined, a phototaking system for phototaking the image of the...
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6327391 |
Protecting image quality from occurrence of uncorrectable errors
An image reproducing apparatus reproduces an encoded image signal, detects a motion vector of a block including undecodable image signal by using the reproduced image signal, and structuring an...
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6324305 |
Method and apparatus for segmenting a composite image into mixed raster content planes
An improved technique for compressing a color or gray scale pixel map representing a document using an MRC format including a method of segmenting an original pixel map into two planes, and then...
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6320986 |
Preprocessing multiple bit per pixel sampled data for Lempel-Ziv compression
A preprocessor for processing sample data, particularly digital video data, to improve lossless sliding window type Lempel-Ziv compression of the data. Sliding window Lempel-Ziv compression is...
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6317520 |
Non-reversible differential predictive compression using lossy or lossless tables
In a method and a device for transforming a stream of digital numbers, the correlation between successive numbers is utilized in order to obtain a new stream having a very low correlation between...
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6314206 |
Compression ratio setting device
A compression ratio setting device comprises a digital signal processing circuit, in which a digital image signal is compressed, according to the JPEG algorithm, for example, with a compression...
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6314208 |
System for variable quantization in JPEG for compound documents
An image compression system for compound images containing both text and pictures. The system is capable of receiving the images on a non-overlapping 8 by 8 pixel blank basis and includes a...
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6310564 |
Method and apparatus for compressively coding/decoding digital data to reduce the use of band-width or storage space
There are provided coding and decoding apparatuses and coding and decoding methods in which digital data are represented by bits fewer than those by which digital data according to the prior art...
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6310980 |
Encoding apparatus and method and storage medium
An encoding apparatus for encoding each of target pixels composing one screen, comprising a predictor for generating a prediction value by predicting a target pixel value representing a target...
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6307974 |
Image processing apparatus, system, and method with adaptive transfer
This invention is to transmit read image data to a host device using a transfer mode which guarantees a predetermined band and does not perform error check or retransmission time suitable for the...
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6307970 |
Search system for use in compression
This disclosure provides a block-based compression system which uses a variable size search window, to thereby substantially reduce the time required for compression. In a MPEG-2 system, square...
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6301392 |
Efficient methodology to select the quantization threshold parameters in a DWT-based image compression scheme in order to score a predefined minimum number of images into a fixed size secondary storage
A method comprising selecting a quantization threshold parameters set based upon available storage in a storage mechanism configured to store quantized image data, and quantizing image data using...
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6298165 |
Method for improving data encoding and decoding efficiency
A method improves the efficiency of a compression technique by introducing a new parameter to be associated with a given probability range for events. When the new parameter is to be utilized, that...
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6295379 |
DPCM image compression with plural quantization table levels
A method and apparatus for encoding a digital image is disclosed. A differences is calculated between a first sample from a current scan line and a corresponding second sample from a previous scan...
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6292589 |
Method for choosing rate control parameters in motion-compensated transform-based picture coding scheme using non-parametric technique
A method of assigning quantization values for use during the compression of images is disclosed. The method includes constructing a non-parametric model during a training phase based on...
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6292590 |
Dynamic coding with exchanging pixels
In ordinary encoding operations, edges are disadvantageous in terms of compression because of the large amount of information involved there so that distorted and unbalanced quantization can occur...
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6285793 |
Method and apparatus for automatically determining a quantization factor value that produces a desired average compression ratio of an image sequence using JPEG compression
A sequence of angiographic images is made up of frames of data. A sample sequence, made up of a number of such frames, is compressed using a lower value of the quantization factor and the resulting...
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6282321 |
Context generation circuit and method for small screen
A context generation circuit for a small screen, and a method therefor, are provided. The circuit can generate a context with respect to an image that is larger than the horizontal size of a...
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6282241 |
Apparatus for video rate control using a fuzzy rule-based control
Fuzzy rule-based control is applied to video rate control in the present invention. A basic fuzzy logic controlling apparatus using the occupancy as a fuzzy control variable is provided. Other...
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6275527 |
Pre-quantization in motion compensated video coding
Apparatus and methods are provided for encoding video data in a manner which significantly reduces the computation performed by the video encoder and the video decoder without suffering any...
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6272568 |
Method for recording information on a memory
A reference value is set for recording quantity of information, and a plurality of compression factors is provided for compressing information to be recorded. The compression factors are arranged...
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6266449 |
Information processing apparatus and method which selectively controls data encoding by monitoring amount of encoded data
The invention provides an information processing apparatus in which data is encoded with a desired compression ratio without producing significant degradation in the quality of the encoded data....
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6266447 |
Coding apparatus
A coding apparatus includes a large block forming unit for forming a large block of sample values of an input signal, a small block forming unit for dividing the large block into a plurality of...
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