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6741649 |
Coding apparatus for audio and picture signals
To improve qualities of audio and picture signals by distributing adaptively the code quantities of audio codes and picture codes and by adopting variable rate audio coding. The audio/picture...
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6724977 |
Compressed video editor with transition buffer matcher
A method and system for determining and recording a minimal ending video buffer verifier fullness at each of a plurality of entry points in a compressed variable bit rate video bit stream.
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6714592 |
Picture information conversion method and apparatus
A picture information conversion method and apparatus in which, if the compressed picture information with a variable or non-recognized information volume is input, optimum compression processing...
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6574275 |
Decoding apparatus and decoding method
A data compressing circuit to compress an amount of data which is stored into an image memory is provided at the front stage of the image memory which is used for a motion compensation prediction....
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6549574 |
Transmission system with improved receiver
In a transmission system for digital symbols, such as used for DVB, source symbols are encoded by a block coder ( 4 ), subjected to an interleaving operation in an interleaver and subsequently...
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6546049 |
Parameterized quantization matrix adaptation for video encoding
In video compression processing, such as MPEG-2 compression processing, the quantization (Q) matrix used to quantize discrete cosine transform (DCT) coefficients is updated from frame to frame...
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6535556 |
Apparatus and method for encoding images and medium in which image encoding program has been recorded
In the case where the code generation volume that the data occupancy rate in the buffer of the image decoding apparatus is smaller than the first, second or the third threshold value corresponding...
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6532262 |
Coding method and apparatus and recorder
A coder of the present invention is adapted to reproduce a signal of quality at a low coding rate even when a video or audio signal continuously supplied thereto should be coded in real time. The...
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6529552 |
Method and a device for transmission of a variable bit-rate compressed video bitstream over constant and variable capacity networks
A method and device for producing and delivering constant quality digital video bitstreams over channels of any bit-rate and variability are provided. The method and device may be applicable to any...
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6529551 |
Data efficient quantization table for a digital video signal processor
An MPEG coded and compressed video signal is received and decompressed for display. Prior to storing frames required for motion compensation in memory, pixel blocks are recompressed into DPCM...
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6522693 |
System and method for reencoding segments of buffer constrained video streams
A system and method for generating an MPEG compliant video stream with satisfactory visual quality. The method employs re-encoding at a higher (or lower) bit rate, only the segments with...
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6512792 |
Moving image encoding apparatus with a quantization step size different from the dequantization step size
A moving image encoding apparatus which has a similar function to noise elimination by a pre-processing filter without requiring a large amount of calculation and a large apparatus scale. A...
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6504494 |
Software, method and apparatus for rate controlled image compression
Method, software, and apparatus ( 100, 300, 400 ) for performing rate controlled image compression are provided. A quantization matrix scaling factor that results in compression to a predetermined...
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6463100 |
Adaptive quantization control method
A method and apparatus for an adaptive quantization control is disclosed. The present invention decomposes one picture into a plurality of blocks, encodes the picture in the block unit and controls...
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6438167 |
Code amount control device and encoding apparatus using the same
An encoding apparatus including a block forming unit for dividing an input signal into blocks each consisting of a plurality of sample values, an orthogonal conversion unit for orthogonally...
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6438169 |
Video signal compressing method and apparatus, and compressed data multiplexing method and apparatus
A video signal compressing method and a video signal compressing apparatus for compressing a video signal for a system in which for a synchronism between a plurality of compressed signals must be...
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6421383 |
Encoding digital signals
A motion factor coding apparatus receives an input video signal which is applied to a subtractor and to a motion estimator which generates motion vectors for the current frame relative to a...
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6408027 |
Apparatus and method for coding moving picture
The present invention provides an apparatus and method for coding moving pictures, which reduces a delay time generated by buffering of a decoding apparatus in compressive coding of the moving...
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6404812 |
Method and apparatus for controlling video encoder output bit rate using progressive re-quantization
A method for processing image data includes quantizing a region in a frame with an initial quantizer level. It is determined whether an amount of bits required for encoding the region after...
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6389074 |
Method and apparatus for digital data compression
A method of compressing digital data is disclosed including the steps of transforming the data utilizing a discrete wavelet transform to produce corresponding transformed data; quantizing the...
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6389073 |
Coding control method, coding control apparatus and storage medium containing coding control program
In a coding control apparatus deciding, when coding of motion picture data on the basis of a generated information amount Aig of coded data generated by coding one frame, a quantization...
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6381274 |
Method and apparatus for encoding video signal
Input picture data represents a succession of pictures each composed of plural blocks. The input picture data is quantized into first quantization-resultant data in response to a fixed quantization...
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6359928 |
System and method for compressing images using multi-threshold wavelet coding
A system and method for performing image compression using multi-threshold wavelet coding (MTWC) which utilizes a separate initial quantization threshold for each subband generated by the wavelet...
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6282242 |
Data compression device that switches between intra-frame coding and inter-frame coding
A data compression device for correctly allotting limited amounts of data and performing high image quality compression of video data by means of a method suitable for an authoring device such as...
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6256420 |
Data transmission system
A transmission system which quantizes a data signal into quantized data and alternatively either transmits the quantized data while controlling a quantity of distortion to a constant value or...
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6229849 |
Coding device and method
An upper limit of a usable range of a VBV buffer is determined from a preset delay time of the VBV buffer and a designated bit rate. A target bit quantity of a picture (i) and a data occupancy...
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6226326 |
Coding device and coding method
A video encoder for changing the bit rate at a halfway point in a GOP by using a TM5 (Test Model 5) bit rate control algorithm is provided. Using a bit quantity Rj(+1) allocated to non-coded...
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6215821 |
Communication system using an intersource coding technique
A method and apparatus for achieving maximum bandwidth reduction in communication networks. The invention provides a multisource coding scheme, implemented through an intersource coding block that...
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6195388 |
Apparatus and method for encoding multiple video programs
A video encoding apparatus includes a plurality of encoders for encoding each of a plurality of video programs received from external; a multiplexer for multiplexing outputs of the plurality of...
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6192081 |
Apparatus and method for selecting a coding mode in a block-based coding system
An apparatus and concomitant method for selecting a macroblock coding mode based upon the quantization scale selected for the macroblock. The total number of bits needed to code each macroblock...
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6141380 |
Frame-level rate control for video compression
The algorithm assumes a constant bit rate over a timing window of specified duration (e.g., a specified number of consecutive frames), where the current frame to be encoded lies in the interior of...
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6094455 |
Image compression/encoding apparatus and system with quantization width control based on bit generation error
According to the present invention, an image compression/encoding apparatus for determining a quantization width by which a video signal is encoded so as to encode the video signal based on the...
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RE36680 |
Moving-image signal encoding apparatus with variably selected quantization step size
A moving-image signal encoding apparatus includes a transmission buffer memory. A first quantization step size for a normal block other than a refreshed block is determined on the basis of an...
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6044115 |
Method and apparatus for coding and decoding digital image data using image quantization modification
An image coding method and apparatus for transforming and quantizing an image to produce transformed and quantized coefficients. The coefficients are coded and a complexity index value is obtained...
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6028961 |
Image processing method and apparatus
When image data is compressed in units of blocks, if a compressed data amount D obtained by reversibly compressing a block, and a predetermined value L satisfy D≤L, the block is reversibly...
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6028965 |
Method and apparatus for intelligent codec system
A system for encoding and decoding data blocks and methods of operating the same result in an encoder that provides intelligent data rate control. The encoder comprises DCT (discrete cosine...
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6011590 |
Method of transmitting compressed information to minimize buffer space
A system and method for transmitting blocks of compressed data in an ATM network is disclosed. Compressed data blocks representing a video are labeled prior to transmission with the amount of data...
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5999218 |
Adaptive quantization controller
An adder 101 computes the difference between the activity (act) of an objective block and the average value (avg(act)) of activities all over the previous frame. A shifter 102 shifts the difference...
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5986714 |
Method, apparatus and computer program product for selectively reducing bandwidth of real-time video data
Method, apparatus and computer program product are disclosed for selectively reducing the bandwidth of real-time video data for transmission on a bus having varying bandwidth, while minimizing...
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5978544 |
Video compression coding apparatus and video compression recording/playback apparatus
The object of the present invention is to provide a video compression coding apparatus which, in the case where a code quantity variation allows a greater margin, can compress video data while...
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5966181 |
Video coding system with buffer control quantization step size
A method and device for image coding, primarily intended to be applied in the transmission of video signals, convert a video signal to a bit stream by coding and quantising. The bit stream is...
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5959872 |
Apparatus and method for bidirectional scanning of video coefficients
A bidirectional discrete cosine transform (DCT) coefficient scanning apparatus includes a buffer memory, an address generator based on a look-up table for converting a first address signal to a...
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5949487 |
Video editing buffer management
A method and apparatus are provided for encoding of digital video signals in the form of video clips (A,B) to enable them to be seamlessly joined without requiring reset of a decoder to a starting...
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5949490 |
Distributing video buffer rate control over a parallel compression architecture
An algorithm for distributing video buffer rate control over a parallel compression architecture uses parallel processors to first compute complexity measures for each macroblock of a current...
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5931922 |
Media server system for preventing FIFO buffer underflow during multiple channel startup by waiting until buffer receives plurality of data blocks before enabling buffer to transmit received data
A media server system and method for reducing the probability of data starvation or underflow in a media server system. The media server system preferably comprises a video server computer system...
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5929916 |
Variable bit rate encoding
A rate control algorithm for an MPEG-2 compliant encoder has embodiments useful for constant bit rate and variable bit rate encoding. In particular, the present invention relates to variable bit...
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5926569 |
Bitrate damper for selecting quantization levels for image encoding
For each image, an initial set of quantization (Q) levels is selected based on the pixel data. The pixel data are transformed to blocks of transform coefficients. The initial set of Q levels is...
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5907363 |
Method for controlling a compressed data buffer
A system and method controls an encoder data buffer. The system includes an encoder for encoding input data as a first bit sequence in a bitstream; a processor having a predetermined size for...
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5901149 |
Decode and encode system
According to decode system and method of the present invention in which a system clock is generated on the basis of a time stamp contained in transmission data to be transmitted every packet, and...
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5900946 |
Image information encoding/decoding apparatus assuring a minimum compression ratio and limiting a transfer rate
Transfer control information for controlling a transfer amount per unit time of a transfer path is delivered from a transfer control section to an information transfer section. During encoding, the...
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