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7391916 |
Quantization matrix adjusting method for quality improvement
A quantization matrix adjusting method for quality improvement by scaling down the default quantization matrix. The adjusting method comprises the steps of: updating a used bits BB_X and an average...
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7391807 |
Video transcoding of scalable multi-layer videos to single layer video
A method transcodes a compressed multi-layer video bitstream that includes a base layer bitstream and an enhancement layer bitstream. The base and enhancement layers are first partially decoded,...
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7388995 |
Quantization matrix adjusting method for avoiding underflow of data
A quantization matrix adjusting method for avoiding underflow of VBV by enlarging the default quantization matrix. The adjusting method comprises the steps of: updating a used bits BB_X and an...
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7382830 |
Apparatus for generating motion control signal from image signal
In order to easily generate a control signal when a motion in accordance with an image is applied to a chair for an observer, a motion vector is detected from an image signal input to an image...
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7379496 |
Multi-resolution video coding and decoding
A video encoder performs multi-resolution video coding. For example, the encoder adaptively changes frame sizes to reduce blocking artifacts at low bitrates. A video decoder performs corresponding...
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7372903 |
Apparatus and method for object based rate control in a coding system
A method and apparatus for selecting a quantizer scale for each object within a frame to optimize the coding rate is disclosed. A quantizer scale is selected for each region or “object” within...
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7366240 |
Decoder and method of decoding using pseudo two pass decoding and one pass encoding
A method of processing video frame data includes the steps of: receiving a video frame; partially decoding the video frame; fully decoding the video frame to produce macroblocks; determining video...
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7359456 |
Communication system and communication device
A communication system for transmitting a transmission signal in digital form from a transmitter to a receiver is disclosed. The transmitter includes a modulation part modulating a carrier wave in...
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7356080 |
MPEG-4 encoder using H.263 multimedia chip
An MPEG-4 encoder utilizing an H.263 multimedia chip. The MPEG-4 encoder includes a DC (Direct Current) predictor for predicting a DC component of the image frame encoded by an H.263 standard upon...
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7356079 |
Method and system for rate control during video transcoding
A local system encodes previously decoded video data using a transcoding quantization value based on a source quantization value provided by a previous encoder as part of the retrieved video data....
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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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7349472 |
Rate-distortion models for error resilient video transcoding
A model stored in a memory accessible by a video transcoder includes a first rate-distortion function modeling a requantization of an input video. A second-rate distortion function models a...
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7343287 |
Method and apparatus for scalable encoding and method and apparatus for scalable decoding
An apparatus for scalable encoding a spectrum of a signal including audio and/or video information, with the spectrum comprising binary spectral values, includes a means for generating a first...
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7333542 |
Moving picture decoding apparatus and moving picture decoding method
A memory compression and expansion section ( 11 of FIG. 1 ) applies compression to a decoded image, and the result is stored in a frame memory. Based on an occupied content of the frame memory...
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7330595 |
System and method for video data compression
A system and method perform video data compression in a manner that limits the need for external memory access. Accordingly, the operational frequency of the local data bus is reduced and power...
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7330509 |
Method for video transcoding with adaptive frame rate control
A video transcoding method is provided for transcoding a first signal stream compressed by a first coding scheme to a second signal stream compressed by a second coding scheme. The method employs...
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7327785 |
Noise reduction method, apparatus, system, and computer program product
A video coding apparatus, method, and computer program product for removing transform coding noise especially in flat areas of a frame, which appears as remaining parts of moving objects in a video...
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7327784 |
Method and system for transcoding video data
A first method of transcoding video data is disclosed that generates a motion vector for a macroblock encoded as a dual prime macro block that has a direct motion vector, and differential motion...
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7324594 |
Method for encoding and decoding free viewpoint videos
A system encodes videos acquired of a moving object in a scene by multiple fixed cameras. Camera calibration data of each camera are first determined. The camera calibration data of each camera are...
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7321618 |
PCM upstream data transmission server
A method for designing an equalizer and tracking performance for upstream PCM in a digital communications network is described. The invention optimizes upstream data rate rates for data...
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7302107 |
JPEG encoding for document images using pixel classification
The invention provides a system and method for JPEG encoding an image that includes variable quantization for each block, depending upon the classification of each block, which is dependent on the...
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7301999 |
Quantization method and system for video MPEG applications and computer program product therefor
Digital signals are converted between a first and second format by a conversion process including generating coefficients representing the digital signals. The coefficients may be discrete cosine...
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7295610 |
Hybrid rate control in a digital stream transcoder
A rate controller in run-level domain transcoder, which receives a stream of compressed frames carried in a bit stream, selectively determines whether to quantize and/or threshold portions of a...
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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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7292635 |
Interframe wavelet video coding method
An interframe wavelet video coding (IWVC) method by which an average temporal distance (ATD) is minimized is provided. The IWVC method comprises receiving a group-of-frames and decomposing the...
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7289562 |
Adaptive filter to improve H-264 video quality
A method for reducing or eliminating coding artifacts in video pictures processed using intra block prediction methods, for example, according to the H.264 standard. The causes of the coding...
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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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7280594 |
Method and apparatus for motion estimation in a sequence of digital images
In some embodiments of the present invention, low frequency components for a current block in a current picture and a candidate block in a reference picture are obtained. For each of the low...
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7277483 |
Method and apparatus for rate control for constant-bit-rate finite-buffer-size video encoder
A method and apparatus for rate control for a constant-bit-rate finite-buffer-size video encoder is described. Rate control is provided by adjusting the size of non-intra frames based on the size...
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7269218 |
Process and device for decoding video data coded according to the MPEG standard
The process is characterized in that it performs the inverse operations ( 26, 27, 28 ) of the successive coding operations, in an inverse order, coefficient by coefficient rather than block by...
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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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7263124 |
Scalable coding scheme for low latency applications
Fractional parts of quantized video coefficients are used as enhancement layers when encoding a video steam. This use of the fractional parts allows the reuse of decoding components.
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7257159 |
Method for coding video pictures by determining a sub-target value for the number of bits per sub-series of coefficients
The bitrate control of known video encoders is based on a control of the quantization step size per picture block. In transform coding of relatively large picture blocks, the video picture...
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7257157 |
Method of and system for optimizing mode selection for video coding
Mode selection is optimized for video coding requiring sequencing of decisions with respect to a data block sequence. Each decision is selected from a mode set. The sequence is a directed acyclic...
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7254176 |
Apparatus for variable bit rate control in video compression and target bit allocator thereof
An apparatus for variable bit rate control in moving picture compression. First, a total activity measure for the current picture to be encoded in a set of consecutive pictures is calculated. Based...
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7251276 |
Loop-filtering method for image data and apparatus therefor
A loop-filtering method for reducing quantization effect generated when an image data is encoded and decoded, and an apparatus therefor. The loop-filtering method includes the steps of extracting a...
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7251275 |
Methods and apparatus for statistical multiplexing during dual pass encoding
Methods and apparatus for statistical multiplexing in a dual pass encoding scheme are provided. A first pass encoder encodes alternate slices of anchor frames as I-slices and P-slices respectively...
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7242812 |
Coding and decoding of video data
A novel method for coding and decoding video data and codec thereof are disclosed. The invented method provides an FGS (fine grained scalability) algorithm using bit plane coding technique. While...
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7242713 |
2-D transforms for image and video coding
A set of one and two-dimensional transforms is constructed subject to certain range limited constraints to provide a computationally efficient transform implementation, such as for use in image 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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7227898 |
Digital signal conversion method and digital signal conversion device
An inputted digital signal of a first format (DV video signal) is restored to a variable-length code by having its framing cancelled by a de-framing section 11 , then decoded by a variable-length...
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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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7218674 |
Method and device for controlling quantization scales of a video encoding bit stream
A method for controlling quantization scales when encoding video signals, includes: obtaining a number of changes in the quantization scales of within a time period; generating a new quantization...
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7212973 |
Encoding method, encoding apparatus, decoding method, decoding apparatus and program
In a quantization step information encoding unit, an average value of the quantization step information is found in an approximate shape extraction unit ( 20 ), first of all, from one set of a...
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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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7209519 |
Encoding a video with a variable frame-rate while minimizing total average distortion
A method encodes a video as video objects. For each candidate object, a quantizer parameter and a skip parameter that jointly minimizes an average total distortion in the video are determined while...
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7203375 |
Quantization error compensation apparatus and method thereof
A quantization error compensation includes a dividing unit to divide an input current image signal into a first high-frequency signal and a low-frequency signal; a changing unit to replace bits of...
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7203234 |
Method of directional filtering for post-processing compressed video
A method of post-processing decompressed images includes identification of the direction of an image edge in a pixel block of the image and filtering applied along the boundary of the block in a...
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7200276 |
Rate allocation for mixed content video
The present invention relates to regulating the quality and/or bitrate of content within mixed content video when the video is compressed subject to a bitrate constraint. For example, a screen...
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7197072 |
Systems and methods for resetting rate control state variables upon the detection of a scene change within a group of pictures
The invention is related to methods and apparatus that advantageously improve picture quality in a video encoder, such as an MPEG video encoder. Scene changes typically occur relatively frequently...
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