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Class 375/240.11 - Subband coding


Subclass of Class 375 - Pulse or digital communications
Definition: Subject matter wherein the image signal is divided into
No. of patents: 424
Last issue date: 05/08/2012


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NumberTitleIssue Date
5949911System and method for scalable coding of sparse data sets
A data encoding system and method successively generates compressed data on a bit plane by bit plane basis, starting with the bit position of the most significant non-zero bit for the node in the data array having the largest absolute value, and then enco...
09/07/1999
5929913Motion vector detector and video coder
By a motion vector correction circuit 313, a motion vector minimizing the sum of a value of the quadratic error function having a motion vector as a variable and the motion vector changing amount in neighboring blocks is determined, and it is linearly int...
07/27/1999
5929912Image coding/decoding apparatus
An image coding/decoding apparatus offers a visually high quality image at a very low bit rate. The image is divided into images for individual regions using its shape information. Each region is made into rectangle blocks by an extrapolating process, whe...
07/27/1999
5926791Recursively splitting the low-frequency band with successively fewer filter taps in methods and apparatuses for sub-band encoding, decoding, and encoding and decoding
A sub-band encoding method for splitting the frequency spectrum of an input signal into plural bands, encoding the signals of the respective bands and transmitting the encoded signal, is disclosed. The encoding method includes a first step of splitting th...
07/20/1999
5909518System and method for performing wavelet-like and inverse wavelet-like transformations of digital data
A data processing system and method for performing a wavelet-like transformation and a corresponding inverse wavelet-like transformation is disclosed. The wavelet-like transformation is performed on input data so as to produce decomposed data. For each se...
06/01/1999
5907360Coder/decoder for television image sub-band compatible coding, and its application to hierarchical motion coding by tree structures
A coder/decoder including a device for constructing from the preceding decoded image and from the current source image two pyramids of images of unlike resolution. Each pyramid contains the same number of images ordered identically according to their reso...
05/25/1999
5907642Method and apparatus for enhancing images by emphasis processing of a multiresolution frequency band
An original image is transformed into a multi-resolution space and thereby decomposed into images, each of which is of one of a plurality of different frequency bands. An operation for multiplying by an emphasis coefficient is carried out on an image of a...
05/25/1999
5901178Post-compression hidden data transport for video
Auxiliary data is carried substantially imperceptibly with video transform data in combined transform samples according to a visibility threshold. The auxiliary data provides a capability for a copy protect scheme or verification of television viewing act...
05/04/1999
5889559Method and apparatus for minimally-shifted wavelet decomposition and recomposition
The present invention relates to a system for decomposing and recomposing wavelets with minimum filter delay. The system includes multiple low-pass filters and multiple high-pass filters. Each filter in the system has associated filter coefficients. A fil...
03/30/1999
5883978Image compressing method and image compressing apparatus
In image compression utilizing wavelet conversion for dividing an image of one screen into subbands through multiple steps, subband data of a higher frequency is predicted from subband data of a lower frequency, subtraction is carried out between data obt...
03/16/1999
5844610Adaptive method and device for sub-band analysis and synthesis
An adaptive method for television image encoding by splitting the video image to be transmitted into sub-bands at the time of analysis filtering of the image encoder. These sub-bands are split into a tree-like structure by filtering and decimation. Local ...
12/01/1998
5845013Region-based texture coding method and decoding method, and corresponding systems
The invention relates to an image sequence coding method in which images are segmented and coded with respect to their contours and textures. The texture coding step is carried out by means of a lattice vector quantization method adapted to region-based c...
12/01/1998
5841473Image sequence compression and decompression
A method and system for compressing and decompressing a sequence of image frames is disclosed. According to the disclosed embodiments of the invention, the compression process includes an intraframe decomposition process (24, 24') performed upon each fram...
11/24/1998
5838377Video compressed circuit using recursive wavelet filtering
A video compression circuit comprises an input that receives an input video signal. A memory buffer, coupled to the input, temporarily stores a portion of the input video signal. A single horizontal filter bank, coupled to the memory buffer, high-pass and...
11/17/1998
5835037Method and apparatus for modeling discrete data sequences by multiple vector representation
A method for encoding and decoding digital signals, particularly audio signals, by using multiple reference vectors from a codebook and adaptively updating the codebook. The reference vectors from the codebook are combined, using a mathematical combinatio...
11/10/1998
5832234Encoding images using block-based macroblock-level statistics
Block-level statistical measures are generated and then used to generate macroblock-level statistical measures, which are in turn used to determine how to encode the macroblocks of the image. In a preferred embodiment, a macroblock-level intra-SAD measure...
11/03/1998
5825927Methods and apparatus for encoding video data in a manner that is well suited for decoding by regular or downconverting decoders
Plurality of encoding methods and apparatus for encoding video data in a manner that makes it well suited for decoding by either regular or downconverting decoders are described. In one embodiment, the selection and/or generation of motion vectors by an e...
10/20/1998
5825935Subband coding method with wavelet transform for high efficiency video signal compression
A subband coding method for dividing a digital video signal into a plurality of frequency bands in vertical and horizontal directions in a spatial frequency region includes executing two-dimensional multilayer (n-layer) wavelet transform on each processin...
10/20/1998
5822005Pre-oddification
Pre-oddification of quantized discrete cosine transform (DCT) coefficients representing video data reduces high frequency noise that accumulates over multiple stages of encoding/decoding due to oddification in the decoders. The quantized DCT coefficients ...
10/13/1998
5808683Subband image coding and decoding
In encoding an input picture signal, the input signal is split by subband splitting into plural frequency bands for generating signals of plural frequency bands, and the signals of the respective frequency bands are quantized for generating quantized sign...
09/15/1998
5801778Video 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 generate first, second and third reduced resolution images w...
09/01/1998
5798795Method and apparatus for encoding and decoding video signals
A method is set forth for encoding and decoding a video signal, including the following steps: encoding the signal, the encoding including separating the signal into a plurality of spatial frequency bands at different frame rates, and temporally pre-filte...
08/25/1998
5798794Wavelet transform subband coding with frequency-dependent quantization step size
A subband coding method for dividing a luminance signal or a color difference signal in a digital video signal into a plurality of frequency bands in vertical and horizontal directions in a spatial frequency region by executing two-dimensional multilayer ...
08/25/1998
5777677Approximate MPEG decoder with compressed reference frames
A method and apparatus are provided for reducing the memory requirements of a decoding subsystem by storing reference frames in compressed form. A reference picture in a sequence is decoded, compressed and stored in memory. When the reference frame is nee...
07/07/1998
5777678Predictive sub-band video coding and decoding using motion compensation
A method and apparatus for sub-band encoding an input signal in which ringing may be diminished. When performing a number of wavelet transform operations by sub-band encoding, filtering the of signals is done with a small number of taps with increased num...
07/07/1998
5768481Method and apparatus for compression of digitized image data using a dynamic band recompression scheme
The present invention is directed to systems and methods for encoding (for example, compressing) image data while at the same time, improving both the compression ratio and the perceptibility of the decoded (for example, decompressed) image using a dynami...
06/16/1998
5754794Subband coding using local bases in multiple dimensions
A method and apparatus for encoding and decoding multi-dimensional signals is disclosed. Non-separable multi-dimensional filters are utilized. Analysis filters encode the signal by applying a windowing function and a reduction function to the multi-dimens...
05/19/1998
5748787Hierarchy type encoding/decoding apparatus
A hierarchical encoding/decoding apparatus corresponds to imaging systems having mutually different resolutions. The apparatus constitutes an entire band width apparatus by using two encoding/decoding devices each for a low band width processing. In the l...
05/05/1998
5742892Decoder for a software-implemented end-to-end scalable video delivery system
A decoder is used in an end-to-end scalable video delivery system operable over heterogeneous networks. The decoder may software-based and computationally low complexity, or may be implemented inexpensively in ROM hardware. The system utilizes a scalable ...
04/21/1998
5734430Encoder and decoder
An encoder counts the length of a data produced by the variable-length encoding, and time-division-multiplexes information of the data length to the variable-length encoded data. An encoder time-division-multiplexes information of the number of bits after...
03/31/1998
5734738Ultrasonic diagnosing apparatus
An object to be examined is scanned with an ultrasonic wave and a tomographic image of the object is obtained on the basis of reflected ultrasonic waves. This image is stored in a frame memory. The types of the motion of the image, i.e., a still image, a ...
03/31/1998
5708732Fast DCT domain downsampling and inverse motion compensation
Downsampling and inverse motion compensation are performed on compressed domain representations for video. By directly manipulating the compressed domain representation instead of the spatial domain representation, computational complexity is significantl...
01/13/1998
5703579Decoder for compressed digital signals
In an encoder for decoding compression data obtained by conducting a compression encoding for digital data through subband division, logarithmic compression, and variable-bit-length quantization, an exponent of an exponent operation is separated into an i...
12/30/1997
5675424Image decoder for image compression/expansion system
An image decoder for an image compression/expansion system of HDTV or MPEG standard having an image motion compensation process, in which transform coding of video signal is parallel-processed in the unit of a predetermined image block with a reduced-spee...
10/07/1997
5673289Method for encoding digital audio signals and apparatus thereof
A method and an apparatus for encoding a digital audio signal are provided. The method comprises the steps of: mapping the digital audio signal into a plurality of sub-bands and outputting the mapped sub-band signals; allocating a number of bits to each s...
09/30/1997
5666383Variable rate discrete multiple tone bidirectional transmission
This invention provides a method and apparatus for providing easily adaptable and select transmission and reception rates between a number of clients and a server. With this invention a broadband signal is transmitted/received from the server to the clien...
09/09/1997
5659363Coding and decoding of video signals
A video signal coding apparatus for coding first and second input video images comprises a motion vector generator for matching pixels of the second input image B with pixels of the first input image A to derive motion vectors representing the motion of p...
08/19/1997
5633684Image information compression and decompression device
An image information compression and decompression device produces a low frequency band signal suitable for reproduction of a standard definition (SD) image and a combined high frequency band signal which, when processed together with the low frequency ba...
05/27/1997
5631978Method and apparatus for subband coding images
This technique for coding images involves filtering the original input image into subband images using successive high-pass and low-pass filterings over a tree-shaped filter with each tree filtering stage involving re-scaling operations adjusted to keep t...
05/20/1997
5629737Method and apparatus for subband coding video signals
Technique for coding video images by filtering the original input image into subband images using successive high-pass and low-pass filterings over a tree-shaped filter bank. Each subband image is then submitted to activity detection and coded with a diff...
05/13/1997
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