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7391809 |
Scalable video transcoding
A scalable video transcoder with limited drifting error is disclosed. The transcoder accumulates re-quantization errors of I-frames or P-frames. The accumulated errors are only selectively...
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7372916 |
Process and devices for transmitting digital signals over buses and computer program product therefore
Digital signals are transmitted on a bus at given instants selectively in a non-encoded format and an encoded format. The decision whether to transmit the signals in non-encoded format or in...
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7340394 |
Using quality and bit count parameters in quality and rate control for digital audio
An audio encoder regulates quality and bitrate with a control strategy. The strategy includes several features. First, an encoder regulates quantization using quality, minimum bit count, and...
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7302000 |
Method and system for two-pass video encoding using sliding windows
A method for two-pass video encoding using sliding windows. The method receives a video sequence (VS), selects a portion of frames in the VS from the beginning as an analysis window, encodes each...
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7295971 |
Accounting for non-monotonicity of quality as a function of quantization in quality and rate control for digital audio
An audio encoder regulates quality and bitrate with a control strategy. The strategy includes several features. First, an encoder regulates quantization using quality, minimum bit count, and...
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7295609 |
Method and apparatus for coding image information, method and apparatus for decoding image information, method and apparatus for coding and decoding image information, and system of coding and transmitting image information
An image information coding apparatus codes an input image signal in a manner optimized on the basis of the visual characteristics. In quantization, an input image signal is divided into blocks, an...
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7280595 |
Post-inverse-quantization AC prediction with a unified variable-length-decoding and inverse-quantization stage
A motion-picture-experts group (MPEG) decoder performs AC prediction to decode first-column or first-row coefficients that are coded as differences from corresponding coefficients in a prior block...
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7277484 |
Image coding and decoding method and apparatus considering human visual characteristics
An image coding method and apparatus considering human visual characteristics are provided. The image coding method comprises (a) modeling image quality distribution of an input image in units of...
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7269219 |
Non-linear quantizer for video coding
A quantizer and dequantizer for use in a video coding system that applies non linear, piece-wise linear scaling functions to video information signals based on a value of a variable quantization...
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7266148 |
Video transcoding apparatus
Disclosed is a video transcoding apparatus converting a specific bit rate of an MPEG (moving pictures experts group) bit stream into a different rate thereof for transportation. The present...
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7263126 |
System and method for transcoding with adaptive bit rate control
A system and method are provided for adaptive rate control in the transcoding of video streams. The method comprises: accepting frames of an input MPEG encoded video stream; decoding the video...
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7260525 |
Filtering of control parameters in quality and rate control for digital audio
An audio encoder regulates quality and bitrate with a control strategy. The strategy includes several features. First, an encoder regulates quantization using quality, minimum bit count, and...
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7236521 |
Digital stream transcoder
A run-level domain transcoder receives a stream of compressed frames carried in a bit stream. The run-level domain transcoder decodes the bit stream into run-level pairs and selectively processes...
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7221706 |
Systems and methods for performing bit rate allocation for a video data stream
The present invention is related to video encoding. In an embodiment, a bit budget is calculated for a first scene. In addition, bit budgets for corresponding frames, including at least a first...
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7212571 |
Method and apparatus for DCT domain filtering for block based encoding
A method for encoding video data to reduce blocking artifacts is provided. The method initiates with identifying a macro-block as being associated with a blocking artifact. For example the...
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7190723 |
Digital stream transcoder with a hybrid-rate controller
A rate controller in a transcoder, which receives a stream of compressed frames carried in a bit stream, selectively determines whether to quantize and/or threshold slices of a frame carried in the...
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7145948 |
Entropy constrained scalar quantizer for a Laplace-Markov source
A video coding system and method for coding an input frame in which the evolution of discrete cosine transform (DCT) coefficients is modeled as a Laplace-Markov process, the system comprising: a...
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7142599 |
Method and device for selecting a transcoding method from a set of transcoding methods
An apparatus and method for selecting a method from a set of methods for transcoding video data, where the data may be transmitted between at least two communication apparatuses via a communication...
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7123654 |
Method and apparatus to encode a moving image with fixed computational complexity
An apparatus and method thereof to encode a moving image include a discrete cosine transform (DCT) unit performing a DCT process on input video data, a quantizer, and a motion estimation (ME) unit...
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7116713 |
Moving picture coding method, moving picture coding apparatus, and moving picture coding program
To provide a process for coding the moving picture with higher speed and enhanced efficiency. The present invention provides a moving picture coding method for coding a moving picture of processing...
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7116712 |
Apparatus and method for parallel multimedia processing
An apparatus and method for processing a multimedia digital bitstream is disclosed. The apparatus comprises a processing chain made up of a plurality of media processors. Each media processor...
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7106796 |
Apparatus and method for adaptively controlling bit rate of video transcoder
Apparatus and method for adaptively controlling a bit rate of a video transcoder are disclosed. Logarithmic R-Q characteristics obtaining the adaptive R-Q characteristics suitable to...
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7092442 |
System and method for adaptive field and frame video encoding using motion activity
A method adaptively encodes a video including a sequence of images, where each image is a picture of two fields. Each image is first separated into a top-field and a bottom-field. Motion activity...
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7075984 |
Code quantity control apparatus, code quantity control method and picture information transformation method
Code quantity control based on a virtual buffer is executed by using information extracted from picture compressed information conforming to a predetermined system. Thus, a reference quantization...
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7065139 |
Video encoding method and video encoder for improving performance
Video encoding methods and video encoders that provide improved performance while reducing power consumption. In one aspect, a video encoding method comprises the steps of outputting a parameter...
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7042943 |
Method and apparatus for control of rate-distortion tradeoff by mode selection in video encoders
A Method And Apparatus For Control of Rate-Distortion Tradeoff by Mode Selection in Video Encoders is Disclosed. The system of the present invention first selects a distortion value D near a...
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7027982 |
Quality and rate control strategy for digital audio
An audio encoder regulates quality and bitrate with a control strategy. The strategy includes several features. First, an encoder regulates quantization using quality, minimum bit count, and...
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6999515 |
Encoding block-organized data
An information stream organized as a sequence of blocks is encoded according to a graceful degradation principle. The stream poses temporal non-uniform data processing requirements. In particular,...
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6999511 |
Dynamically switching quant matrix tables within an MPEG-2 encoder
A digital video encoder is presented adapted for dynamically switching between sets of quantizer matrix tables without pausing encoding of a stream of video data. Two or more sets of quantizer...
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6982762 |
Sequence adaptive bit allocation for pictures encoding
A method and apparatus for encoding pictures of a moving pictures sequence according to an overall target bit-rate, such as in a MPEG video encoder. Each picture has an assigned picture coding type...
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6959041 |
Picture encoding system conversion device and encoding rate conversion device
A picture encoding system conversion device and a code rate conversion device for realizing the conversion taking into account both time delay and picture quality using the information on the code...
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6934329 |
Method of varying the bit rate of the data stream of coded video pictures
A method of producing an output bitstream of coded digital video data with a bit-rate different from the bit-rate of an input bitstream includes dividing the input bitstream into a sequence of...
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6928112 |
Signal coding method, signal coding apparatus, signal recording medium, and signal transmission method
The present invention enables to effectively coding a predetermined time length of a video signal with a variable bit rate at real time (one-path) into a total coding bit amount of a constant data...
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6895054 |
Dynamic bit rate control process
A process of bit rate control includes asymmetrical reactions to changes in the signal density of the digital video signals. In the process, two different averaging periods are employed to meet a...
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6895050 |
Apparatus and method for allocating bits temporaly between frames in a coding system
A method and apparatus for temporally allocating bits between frames in a coding system such that temporal fluctuations are smoothed out. Namely, a picture quality is monitored on a frame by frame...
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6891889 |
Signal to noise ratio optimization for video compression bit-rate control
A method of determining a quantization parameter for video compression. A block characteristic for blocks in a video frame is quantized and then used to obtain a candidate quantization parameter....
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6885703 |
Video code processing method, which can generate continuous moving pictures
A video code processing method includes (a), (b), (c) and (d). The (a) step includes providing a first original bit stream including a video code which is a digitized video signal. The (b) step...
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6845129 |
Controlling a video-buffer-verifier buffer using an MPEG-like encoder
Possible overflow of a video buffer verifier (VBV) buffer employed in MPEG-like video encoders is prevented by controlling bits being drained from a video encoder buffer (eBuff). Specifically, a...
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6826228 |
Conditional masking for video encoder
This method and apparatus described herein imposes masking factors to the determined quantization step sizes of macroblocks of a video sequence such that encoding efficiency is increased. A...
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6795503 |
Video coding method and apparatus that predicts macroblock code length
As the video signals of macroblocks are coded, they are stored in a buffer. When the total code length of the stored macroblocks exceeds a predetermined value, all but the most recently coded...
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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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