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5701159 |
Digital image decoding apparatus
Data which has been decoded by a decoding portion 101 are compressed by a compressing portion 102 and stored in a prediction/display frame memory portion 103. From the data stored in the...
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5684539 |
Method and apparatus for processing encoded video data to reduce the amount of data used to represent a video image
Methods and apparatus for processing digital video data to reduce the amount of video data required to represent a video frame by representing a frame or pair of field pictures into a single field...
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5657350 |
Audio coder/decoder with recursive determination of prediction coefficients based on reflection coefficients derived from correlation coefficients
A coder/decoder for samples of speech or other audio signals with bit rate reduction includes an adaptive prediction filter having filter coefficients which are recursively computed according to...
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5646687 |
Temporally-pipelined predictive encoder/decoder circuit and method
A temporally-pipelined predictive encoder/decoder circuit for encoding or decoding an input signal containing a sequence of data frames received at a particular frame rate and frame data rate into...
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5638124 |
Video signal processing apparatus having an image inserting and extracting circuit for inserting an image into or extracting an image from video signal based on a detected result of a motion detecting circuit
A video signal processing apparatus includes a discrete cosine transform circuit for generating a DC component and an AC component by processing image data in a discrete cosine transform fashion, a...
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5631849 |
Decompressor and compressor for simultaneously decompressing and compressng a plurality of pixels in a pixel array in a digital image differential pulse code modulation (DPCM) system
A digital image differential pulse code modulation decompressor for simultaneously generating, during a cycle of operation of said decompressor, a decompressed value for a plurality of selected...
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5612747 |
Method and apparatus for vector quantization caching in a real time video coder
A method and apparatus for performing vector quantization in a video coder. The method includes obtaining a video frame and segmenting it into coding blocks of predetermined size. A predetermined...
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5612745 |
Method and apparatus for detecting occlusion
The present invention provides a method and apparatus for detecting occluded areas in a video frame. A previous displacement vector field, DVF, is motion compensated (402) and used to provide an...
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5602592 |
Moving picture compressed signal changeover apparatus
A moving picture compressed signal changeover apparatus changes over from a first moving picture compressed signal containing intra-frame coded frames, forward prediction coded frames and...
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5600375 |
Rendering an inter verses intra video encoding decision based upon a vertical gradient measure of target video frames
A video system renders an intra versus inter encoding decision for a digitally sampled target video frame of an image scene by subdividing the target video frame into cells. Each target cell...
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5596321 |
System comprising a first encoder for coding a first digital signal, a second encoder for coding a second digital signal and at least one decoder for decoding coded digital signals, and coder and decoder for use in the system
Known systems based on stereoscopic video coding and video decoding code with inadequate efficiency because the left-hand picture and the right-hand picture are coded and decoded independently of...
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5583979 |
Method of and apparatus for controlling reproduction of image data
The method comprises a read-out step for reading out the image data from a predetermined recording medium according to a frame unit; an image outputting step for image-outputting the frame data...
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5574503 |
Adaptive interframe video data compression and start-up techniques
A start-up and compression technique for transmitting data. A process is provided which utilizes the calculated difference between individual pixel values of subsequent video frames to the current...
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5570133 |
Motion picture encoding system wherein image quality is maximized using inter-frame and intra-frame encoding
In a motion picture encoding system, which permits encoding of motion picture with high encoding efficiency and also permits improvement of the picture quality, priority orders are set...
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5561465 |
Video decoder with five page memory for decoding of intraframes, predicted frames and bidirectional frames
Compression algorithms for digital video signals are based on processing of data blocks of frames which are of three types, i.e. intraframes, predicted frames, and interpolated or bidirectional...
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5559558 |
Apparatus and methodology for coding digital video signals to improve picture quality with minimal overhead
A method of coding a digital video signal and apparatus therefor receives the digital video signal and executes a first compression step in which a frame of the signal is coded using a correlation...
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5544239 |
Method and apparatus for improving motion analysis of fades
A method and apparatus for improving motion analysis in fade regions where motion compensation systems based on block matching typically fail to accurately encode images. A previous image is...
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5543843 |
Communication jack nose cleaning tool
In a method of compressing a motion picture signal divided into blocks of picture data and in which each of the blocks is selectively compressed by discrete cosine transform (DCT) coding or by...
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5537440 |
Efficient transcoding device and method
The present invention provides a transcoder for transcoding of digitally encoded bit streams produced by predictive encoders. The transcoder of this invention is less complex than previously known...
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5532746 |
Bit allocation method for controlling transmission rate of video encoder
A bit allocation method for controlling a transmission rate of a video encoder having an intra mode, a predicted mode and a bidirectionally predicted mode. If the intra mode is selected, it is...
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5530481 |
Video encoder/decoder for encoding/decoding motion compensated images
Video encoder and decoder, provided with a motion compensator for motion-compensated video coding or decoding in which a picture is coded or decoded in blocks in alternately horizontal and vertical...
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5528300 |
Coding mode control device for digital video signal coding system
An encoding apparatus for coding digital video signals describing a scene having at least one moving object and a stationary background, the digital video signals being represented by a series of...
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5515377 |
Adaptive video encoder for two-layer encoding of video signals on ATM (asynchronous transfer mode) networks
The quality of video images received at the remote end of an ATM network capable of transmitting data at high and low priorities is greatly improved at high cell loss levels by employing a...
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5510787 |
System comprising at least one encoder for coding a digital signal and at least one decoder for decoding a digital signal, and encoder and decoder for use in the system according to the invention
Known systems based on layered coding and decoding do not take account of the greater surface area of an HDTV picture, which is to be coded with high resolution, compared with the smaller surface...
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5511093 |
Method for reducing data in a multi-channel data transmission
In a method for reducing data in a multi-channel data transmission, existing cross-relations between the signal channels are determined with due consideration of the transit-time difference. Upon...
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5500677 |
Device for encoding digital signals representing images, and corresponding decoding device
A device for encoding digital signals corresponding to images which are subdivided into blocks has a first encoding channel including a discrete cosine transform circuit. In addition to this first...
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5491513 |
Bit rate controller for encoding video signals
A reference characterization characterizes the relationship between frames encoded using a first encoding process and frames encoded using a second encoding process for a variety of frames. A...
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5489942 |
Image compressing apparatus
An image compressing apparatus has a predictive coding unit, an orthogonal transform unit, a quantization unit, a variable length coding unit, a coding control unit and a start decision unit. The...
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5485212 |
Software video compression for teleconferencing
In a method and apparatus for producing a signal for transmission to a receiver, a video signal is converted to digital form and the data of sequential frames of the signal are arranged in a...
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5485213 |
Method and apparatus for encoding and decoding image data
A designated field image is extracted instead of a frame image and only the effective block of the field image which was judged as a block having a change is also encoded. Block information and...
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5479212 |
Picture data coding apparatus
According to the picture data coding apparatus of the present invention, the picture data storage unit stores each frame inputted from the pre-process unit, and the frame memory stores the...
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5471247 |
Electronic picture reproduction device
In a method of reproducing a television picture composed of picture points represented by digital signals, the picture points are grouped into blocks which are separated by block edges. The blocks...
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5467133 |
Apparatus for compensating video motions in digital televisions
An apparatus for compensating video motions in a digital TV, capable of encoding and decoding data at, a low clock frequency. The apparatus comprises a subtraction circuit, for generating an error...
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5453790 |
Video decoder having asynchronous operation with respect to a video display
A video decoder is proposed which receives packets of video information relating to moving video images from a packet switching network. The video decoder provides for the elimination of a great...
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5450132 |
Method and apparatus for data compression with reduced distortion
Apparatus for compressing data is disclosed in which input data is compressed by a vector quantization process and decoded by the vector quantization process. The input data and the decoded input...
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5450449 |
Linear prediction coefficient generation during frame erasure or packet loss
A speech coding system robust to frame erasure (or packet loss) is described. Illustrative embodiments are directed to a modified version of CCITT standard G.728. In the event of frame erasure,...
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5448297 |
Method and system for encoding images using skip blocks
A region of an image having a plurality of corresponding image values is encoded to generate a temporary encoded region. The temporary encoded region is then decoded to generate a decoded region....
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5432556 |
Coding apparatus
A coding apparatus reduces a digital image signal. The coding apparatus includes a block formatting circuit for dividing the digital image signal into blocks of a plurality of picture elements, an...
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5426462 |
Apparatus for encoding signals using a configurable transform circuit
A signal is encoded by (1) generating a difference signal using a current input signal and a current reference signal, (2) transforming the difference signal to a transform domain, (3) quantizing...
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5422672 |
System comprisisng at least one encoder for coding a digital signal and at least one decoder for decoding a coded digital signal, and encoder and decoder for use in the system
An encoder for coding a digital signal comprises an encoder input for receiving the digital signal; a first data processor, having an input which is coupled to the encoder input, for generating a...
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5420637 |
Dynamic image representation system
A dynamic image representation system comprising apparatus for sensing a dynamic scene and apparatus for providing a pixel count reduced dynamic digital representation of the scene having pixel...
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5420639 |
Rate adaptive huffman coding
Methods for compressing data in a system employing vector quantization (VQ) and Huffman coding comprise: First, quantizing an input vector by representing the input vector with a VQ codevector...
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5418569 |
Method and apparatus for predictive coding of moving images while adaptively changing the method in accordance with them
A method for predictive coding of moving images consists of the steps of calculating preliminary prediction errors of an original group of frames of moving images, accumulating the preliminary...
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5410351 |
Video signal transmission system and method
In a video signal transmission system in which input video signals are high efficiency coded for transmitting, the high efficiency coded data are decoded with quantization information determined...
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5387940 |
Method and apparatus for providing scaleable compressed video signal
A compression/decompression system includes a source of non-interlaced scanned video signal. A preprocessor constructs interlaced scanned video signal from the non-interlaced scanned video signal...
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5386436 |
Synchronization system for use in digital transmission system
In a synchronization system for use in a digital transmission system in which an encoded digital transmission signal at least part of bits of which have specific statistic characteristics is...
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5379071 |
Method of encoding a location of changes in a sequence of video images
The present invention divides a video frame into a series of smaller and smaller quadrants until reaching a single pixel size. By issuing a series of commands, a logical cursor moves within the...
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5369449 |
Method for predicting move compensation
A method for predicting move compensation of an input image based on a move vector of the input image from this input image to a reference image which has been sampled at a first set time, and the...
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5367629 |
Digital video compression system utilizing vector adaptive transform
A video compression system comprises a pre-processing section, an encoder, and a post-processing section. The pre-processing section employs a median decimation filter which combines median...
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5367336 |
Truncation error correction for predictive coding/encoding
Apparatus for eliminating the truncation errors associated with a multiplicative leak factor employed in a predictive coding arrangement adds a temporally varying control signal that affects the...
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