Matches 101 - 150 out of 186 < 1 2 3 4 >
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5892791 High-speed variable length decoding apparatus  
A high-speed variable length decoding apparatus independently generates a run-level symbol and decodes the run-level symbol, to thereby variable length decode the variable length coded data at high...
5889560 MPEG video decoder  
A video decoder that operates according to MPEG (Moving Picture Experts Group) standards. The video decoder includes a parsing stage including inverse quantization and run-length decoding. An...
5854658 Statistical multiplexing system which encodes a sequence of video images using a plurality of video encoders  
A rate control algorithm for an MPEG-2 compliant encoder wherein the rate control algorithm has embodiments useful for constant bit rate and variable bit rate encoding. In particular, the present...
5852669 Automatic face and facial feature location detection for low bit rate model-assisted H.261 compatible coding of video  
An apparatus responds to a video signal representing a succession of frames, where at least one of the frames corresponds to an image of an object, to detect at least a region of the object. The...
5852469 Moving picture coding and/or decoding systems, and variable-length coding and/or decoding system  
A moving picture coding and/or decoding system includes a encoder for coding input image data, a divider for dividing a code string supplied from the encoder, into a plurality of code string, a...
5847765 Moving picture decoding control system  
In a moving picture decoding control system, when the amount of codes accumulated in a buffer memory is between first and second thresholds, the reading-out of the buffer memory is stopped and an...
5841476 Coding apparatus for encoding motion picture  
A motion picture coding apparatus for searching a plurality of proposed coding modes and/or parameters, for selecting a suitable coding mode and/or a suitable parameter, and for encoding motion...
5835149 Bit allocation in a coded video sequence  
A computer-implemented method and apparatus for encoding video pictures of a sequence of video pictures, wherein each picture is defined by one picture type of a plurality of picture types and each...
5818529 Variable length coding of video with controlled deletion of codewords  
When a digital video signal is compressed, the amount of resulting data is predicted and the quantization level is controlled so as to obtain a constant bit rate. The prediction is made by...
5818524 Digital still camera having an image data compression function  
A video still camera in which an image of a photographic subject is converted to digital image data and the digital image data is compressed and stored in memory. The digital image data is first...
5812699 Counter-based controller for video compression  
A current level of a virtual transmission buffer is maintained and used to select video frames for compression. The current level is compared to a threshold to determine whether to compress the...
5801779 Rate control with panic mode  
A rate control algorithm for an MPEG-2 compliant encoder is described. The rate control algorithm has embodiments useful for constant bit rate and variable bit rate encoding. In particular, the...
5767907 Drift reduction methods and apparatus  
A video decoder capable of downsampling full resolution images on a block by block basis regardless of the downsampling rate is disclosed. When the applied downsampling rate does not divide evenly...
5764293 Method of encoding video using master and slave encoders wherein bit budgets for frames to be encoded are based on encoded frames  
A rate control algorithm for an MPEG-2 compliant encoder is described. The rate control algorithm has embodiments useful for constant bit rate and variable bit rate encoding. In particular, the...
5760836 FIFO feedback and control for digital video encoder  
Method and apparatus for encoding a digital video image stream in an encoder. The encoding includes spatial compression of still images in the digital video image stream and temporal compression...
5754241 Video decoder capable of controlling encoded video data  
An MPEG video decoder capable of preventing a buffer for storing a video stream from overflowing and/or underflowing. The video decoding apparatus decodes a coded video bit stream including a...
5751360 Code amount controlling method for coded pictures  
The invention provides a code amount controlling method wherein, when code amount control is performed in units of a GOP, data do not remain in a buffer even if data with which a moving picture...
5734432 Method of incorporating a variable rate auxiliary data stream with a variable rate primary data stream  
A method of incorporating an auxiliary signal with an input video signal includes the step of encoding the input video signal to generate a variable bit rate encoded signal having a selected level...
5724099 Process for controlling the outflow rate of a coder of digital data representative of sequences of images  
A process for controlling the output flow rate of a coder of digital data representative of sequences of images, the coding effected by the coder including a quantization stage of quantization...
5719632 Motion video compression system with buffer empty/fill look-ahead bit allocation  
Systems and methods are provided for allocating bits to pictures in accordance with the bit allocation constraints for operation at both constant and variable bit rates. The encoding complexity of...
5717464 Rate control for a video encoder  
Successive frames in a video sequence are encoded by a video encoder. The bits are apportioned among successive frames to maximize overall perceived video quality when the encoded video sequence is...
5710595 Method and apparatus for controlling quantization and buffering for digital signal compression  
A method and apparatus for controlling quantization and buffering for video digital signal compression wherein a processor determines a bit budget value based on a number of frames to be skipped...
5686964 Bit rate control mechanism for digital image and video data compression  
A bit rate control mechanism for a digital image or video compression system estimates a complexity parameter for a current picture, or block of samples, of a video signal as a function of...
5680483 Method and device for coding digital signals which are representative of a sequence of pictures  
A device for coding a sequence of pictures divided into successive groups of N pictures arranged in picture blocks or macroblocks and including at least one channel for quantization and variable...
5677969 Method, rate controller, and system for preventing overflow and underflow of a decoder buffer in a video compression system  
The present invention is method, rate controller, and system for preventing overflow and underflow of a decoder buffer in a video compression system. First, a plurality of quantized video bits is...
5663962 Method of multiplexing streams of audio-visual signals coded according to standard MPEG1  
The method allows performing the multiplexing of audio-visual streams, coded according to standard MPEG1, to be sent to remote equipment where demultiplexing and decoding occur. The method takes...
5646686 Methods and apparatus for reducing drift in video decoders  
A video decoder capable of downsampling full resolution images on a block by block basis regardless of the downsampling rate is disclosed. When the applied downsampling rate does not divide evenly...
5640420 Variable length coder using two VLC tables  
A digital video signal encoder for coding a block of a digital video signal first converts the block of the digital video signal into a set of quantized transform coefficients having a low and a...
5636294 Method and apparatus for truncation of images during data compression  
An apparatus for and method of truncating images during data compression. The present invention truncates an image when the memory requirements for the compressed image exceeds a predetermined...
5625712 Iterative compression of digital images  
A method and apparatus are provided for compressing image data to enable the storage thereof in a limited amount of memory available in an imaging system. The image data is rasterized into a...
5621820 Video data compression method and system which measures compressed data storage time to optimize compression rate  
A method and system for processing and storing data in which the average time needed for storing the processed data in a storage device is automatically measured, and a processing parameter is...
5619341 Method and apparatus for preventing overflow and underflow of an encoder buffer in a video compression system  
The present invention is method and apparatus for preventing overflow and underflow of an encoder buffer in a video compression system. A virtual buffer is created in a rate controller to model the...
5617150 Video bit rate control method  
A video bit rate control method. SUBGOPs are defined as sets of two to four frames in a GOP. For example, if the GOP comprises IBBPBBPBBPBB frames, each of the SUBGOPs is defined as a set of the...
5614952 Digital video decoder for decoding digital high definition and/or digital standard definition television signals  
Methods and apparatus for reducing the complexity of decoder circuitry and video decoder memory requirements are disclosed. The described video decoders are capable of decoding HDTV pictures at...
5606539 Method and apparatus for encoding and decoding an audio and/or video signal, and a record carrier for use with such apparatus  
Methods and apparatus for encoding and decoding an audio and/or video signal, and a record carrier for use with such apparatus. One or more audio and/or full motion video signals, e.g., a video...
5602594 Buffer control apparatus for compression of video intraframes  
An apparatus for controlling a buffer adapted to transmit motion-involving video compressed by use of an intraframe compression coding technique employing discrete cosine transform and variable...
5566208 Encoder buffer having an effective size which varies automatically with the channel bit-rate  
The effective (or logical) size of the encoder buffer in a video transmission system is varied with the transmission bit-rate. Also, a minimum fill level is maintained in the encoder buffer...
5550589 Method of adaptively multiplexing a plurality of video channel data using channel data assignment information obtained from a look-up table  
A method of adaptively multiplexing a plurality of video channel data is disclosed. A multiplexed data includes a plurality of frames each of which contains a plurality of sub-frames. The video...
5521643 Adaptively coding method and apparatus utilizing variation in quantization step size  
An adaptive coder includes a circuit for calculating the number of intraframe and interframe blocks in one frame to be coded. When the calculated picture data is supplied to the coder, a...
5508745 Apparatus for controlling a quantization level to be modified by a motion vector  
A motion vector calculating device receives horizontal and vertical components of a motion vector and calculates the magnitude of the motion vector. A motion estimating device then compares the...
5504823 Image data partitioning circuit for parallel image decoding system  
There is provided an image data partitioning circuit for use in a parallel image decoding system which is capable of a effective partitioning operation for a variable length coded image, thereby...
5502493 Variable length data decoder for use with MPEG encoded video data  
The present invention is embodied in a decoder for a video signal encoded according to the standard proposed by the Moving Pictures Expert Group (MPEG) of the International Standards Organization...
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...
5493344 Motion vector estimation method and apparatus having half-pixel accuracy  
A system estimating the movement of video signals to half-pixel accuracy includes a first motion detector receiving the present video block data and data for a corresponding search area for...
5488420 Cosmetics filter for smoothing regenerated pictures, e.g. after signal compressing for transmission in a narrowband network  
Smoothing of regenerated digital pictures (e.g. after a heavy signal compression and coding for transmission on a narrowband medium) can be effected by means of a so-called "cosmetics filter" which...
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...
5475433 Fuzzy-controlled coding method and apparatus therefor  
A fuzzy-controlled coding method and apparatus thereof wherein quantization step size which is determined by values of image complexity, buffer fullness, motion vector and picture brightness, is...
5473376 Method and apparatus for adaptive entropy encoding/decoding of quantized transform coefficients in a video compression system  
The present invention is a method (100) and apparatus (300) for adaptive entropy encoding/decoding of a plurality of quantised transform coefficients in a video/image compression system. For...
5457675 Video image updating and reproducing device with image selecting key input means  
A picture reproducing apparatus includes a CD-ROM drive for fetching compressed video image data from a disc on which initial I-picture data for an initial picture for a menu display and a...
5452103 Method and a device for image coding  
The invention relates to a method and a device for image coding having a particular, but not necessarily an exclusive, application in the transmission of video signals. The video signal is...
Matches 101 - 150 out of 186 < 1 2 3 4 >