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7352811 |
Data encoding apparatus and method
A data encoding apparatus operable to encode a plurality of data blocks produces encoded data in accordance with at least one of a selectable target data quantity or a selectable target data...
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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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7180943 |
Compression of a data stream by selection among a set of compression tools
A stream of raw data is compressed prior to transmission in a communication channel by a system which includes modules for choosing a current segment of the raw data stream for processing and...
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7099389 |
Rate control with picture-based lookahead window
A method of rate control using a picture-based lookahead sliding window in a dual-pass transcoder/encoder compressed video architecture extracts statistics from an input video signal according to a...
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7058127 |
Method and system for video transcoding
A system for transcoding compressed video signal, including a plurality of pictures, comprising an estimator to gather information and estimate the signal characteristics about the video signal; a...
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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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6970110 |
Probability centrifuge algorithm with minimum laterally adiabatically-reduced Fisher information calculation
A data compression algorithm which computes from a given probability density, in continuous or histogram form, a “probability centrifuge” probability density and also the Fisher information of...
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6937653 |
Rate control apparatus and method for real-time video communication
A rate control apparatus for real-time video communication includes: an initialization unit for setting an initial value required for rate control according to a transmission speed and the number...
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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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6823009 |
Method for evaluating the degradation of a video image introduced by a digital transmission and/or storage and/or coding system
The invention concerns a method for assessing the degradation of a video image coded by blocks of picture elements or pixels, comprising the following steps: a) selecting an input image and...
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6763067 |
Rate control for bitstream re-encoding
Processing is applied to convert an input compressed video bitstream into an output compressed video bitstream having a different bit rate and/or representing different imagery from the input...
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6760376 |
Motion compensated upconversion for video scan rate conversion
For use in a video image upconversion unit of the type that uses motion compensation to generate an interpolated field using motion vectors, an improved method of motion compensation is disclosed...
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6674797 |
Ensuring video buffer verifer integrity in MPEG-like encoding
Ensuring integrity of a video buffer verifier (VBV) employed in MPEG-like video encoders is realized by controllably adjusting the bits being drained from a video encoder buffer (eBuff). The number...
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6621866 |
Method for inserting a visual element into an MPEG bit stream
A transcoding method for inserting a visual element into an encoded bit stream with minimal decoding of the encoded bit stream. The transcoding method includes the steps of receiving an encoded bit...
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6611795 |
Apparatus and method for providing adaptive forward error correction utilizing the error vector magnitude metric
An adaptive forward error correction technique based on noise bursts and the rate at which they occur is disclosed. The forward error correction parameters are determined using statistics...
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6542544 |
Method and apparatus for detecting fade of image in a video signal
Method and apparatus for detecting fade of a video signal which can detect a fade state of an image from a video signal at a high speed. It is determined that an image based on an original video...
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6509929 |
Apparatus and method for coding a moving picture
A moving picture coding apparatus is provided which is capable of controlling a bit rate of output codes so as not to exceed a target bit rate and reducing noises in a decoded image. The apparatus...
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6381275 |
Image coding apparatus and image decoding apparatus
An image coding apparatus which includes a frame memory selecting unit ( 35 ) for selecting, in response to a selection signal, an image to be continuously stored in a plurality of frame memories (...
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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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5969764 |
Adaptive video coding method
A method adaptively encodes a sequence of frames including video objects to provide a compressed video signal. The encoding is via a buffer having a ariable input rate and a constant output rate....
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5847761 |
Method for performing rate control in a video encoder which provides a bit budget for each frame while employing virtual buffers and virtual buffer verifiers
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...
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5801778 |
Video encoding with multi-stage projection motion estimation
A method and apparatus for performing multi-stage motion estimation on an input video sequence to be encoded. An original image in the video sequence, such as a CCIR601 image, is preprocessed to...
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5500685 |
Wiener filter for filtering noise from a video signal
A digital Wiener filtering method is proposed which applies motion compensation by successive approximations of increasing resolution to determine displacement vectors for two successive image...
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5477272 |
Variable-block size multi-resolution motion estimation scheme for pyramid coding
A novel variable-size block multi-resolution motion estimation (MRME) scheme is presented. The motion estimation scheme can be used to estimate motion vectors in subband coding, wavelet coding and...
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4933763 |
Method of and arrangement for coding digital video signals and corresponding decoding arrangement
Method of coding images converted into digital video signals in accordance with a format having three-dimensional blocks of the signals, wherein the method includes the following preliminary steps:...
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4920414 |
Digital video signal encoding arrangement, and corresponding decoding arrangement
A digital video signal encoding arrangement comprising a correlation reducing circuit receiving said digital signals which are representative of the luminance or the chrominance of a certain number...
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4868641 |
Device for data rate regulation linked to at least two digital video signal components
Device for data rate regulation linked to at least two digital video signal components, having a correlation reduction circuit, a scanning conversion circuit (30), a normalization circuit (40), a...
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4398217 |
Method of and arrangement for digitizing a time-discrete video signal using a picture transform coding
A method of and arrangement for digitizing a video signal using a picture transform coding, wherein a group of N video signal samples is converted into a group of N coefficients y(m) wherein m=1,...
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