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5901249 |
Method for compressing image signals
Wavelet transformation is carried out on an original image signal, and the original image signal is thereby decomposed into image signals, each being of one of a plurality of different frequency...
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5898794 |
Image compression method and image processing system
Disclosed is an image processing system including an image input unit, an extraction unit, a plurality of compression process parts and a selection unit to compress a 1-frame image down to a less...
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5892847 |
Method and apparatus for compressing images
A system and method is disclosed that compresses and decompresses images. The compression system and method includes an encoder which compresses images and stores such compressed images in a unique...
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5889891 |
Universal codebook vector quantization with constrained storage
Vectors associated with multiple sources are quantized with a codebook. A mapping function associates each source with a subset of codevectors in the codebook, each subset being defined prior to...
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5883984 |
Method and apparatus for contrast enhancement of color images
A method for contrast enhancement of pixel data of a decompressed color image includes the steps of computing I component values in an HSI color space for the pixel data of the color image,...
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5880784 |
Method and apparatus for adaptively switching on and off advanced prediction mode in an H.263 video coder
A feedback mechanism for adaptively enabling and disabling an advanced prediction mode for video data processing is disclosed. A quantization parameter (QP) threshold is set and a QP mean for an...
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5850484 |
Text and image sharpening of JPEG compressed images in the frequency domain
The text and image enhancing technique according to the invention is integrated into the decoding or inverse quantization step that is necessarily required by the JPEG standard. The invention...
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5847841 |
Mixed-mode symbol removal for facsimile data compression
A method for data compression provides for an improved digital facsimile document transmission system. The mixed mode method provides that symbols can be located both individually and as a part of...
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5848192 |
Method and apparatus for digital data compression
A system for processing a stream of digital bit sets, each related to a different subject in a passing array, and including an arrangement for compressing the bit-sets and sending the results to an...
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5838821 |
Method and apparatus for selecting compression method and for compressing file using the selected method
A method and system for automatically determining a compression method to be used on a file. A histogram of the file is constructed in order to determine if there are a predetermined number of...
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5838823 |
Video image compression and decompression
A video image compression and decompression system and method operates on frame blocks and uses multiple compression stages to select a best compression method for use with the associated block....
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5835618 |
Uniform and non-uniform dynamic range remapping for optimum image display
A contexture dependent dynamic range remapping system utilizes background estimation, mask generation, parameter estimation and dynamic range remapping of an original image to provide an optimum...
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5832126 |
Method and apparatus for compressing mixed text and image data
To convert a mixture of text data and dot-mapped image data to compressed dot-mapped data not exceeding a given size, the text data are converted to dot-mapped data, then losslessly compressed,...
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5832125 |
Bit rate control using short-term and long-term performance characterization
The performance of video encoding is characterized both over the short term (e.g., based on the previous encoded frame) and over the long term (e.g., based on the previous n encoded frames). An...
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5832130 |
Image signal coding device and method therefor
Image signal coding device employing a quantization step size selecting unit which includes a multi-step quantization unit for performing quantization on the small blocks output from an orthogonal...
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5828788 |
System for processing data in variable segments and with variable data resolution
A dynamically configurable video signal processing system partitions and encodes data using a variable number of data segments and variable data resolution. The system partitions data into a...
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5828789 |
Image coding system and image decoding system
In a coding system, when any of the prediction results of pixel value prediction sections 20 and 21 matches an object pixel, a coding section 50 codes an identifier of the pixel value prediction...
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5825935 |
Subband 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...
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5825830 |
Method and apparatus for the compression of audio, video or other data
A data compression method utilizing a series of rules which are chosen for best compressing selected data. Rules are provided for converting each datum into a binary value, and encoding this binary...
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5822460 |
Method and apparatus for generating chrominance shape information of a video object plane in a video signal
An apparatus generates chrominance shape information based on luminance shape information represented by binary values, to thereby describe an object in a video object plane effectively. The...
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5822465 |
Image encoding by vector quantization of regions of an image and codebook updates
Improved method and apparatus for vector quantization (VQ) to build a codebook for the compression of data. The codebook or "tree" is initialized by establishing N initial nodes and creating the...
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5822003 |
Method and apparatus for performing fast reduced coefficient discrete cosine transforms
A method is provided for performing a fast 3-coefficient Discrete Cosine Transform (DCT) in a software implementation. The method provided exploits symmetries and statistical properties of the...
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5822461 |
Device for determining a quantizing number of an image signal
A device for determining quantizing number of an image signal comprises a discrete cosine transformation for generating a discrete cosine transformation signal by transforming image data, a segment...
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5812700 |
Data compression neural network with winner-take-all function
The invention is embodied in an image data system including a lossy image compressor having an image compression ratio in excess of 10 for producing first compressed image data from an original...
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5805737 |
Image signal compressing device
An image signal compressing device has a quantization processing circuit in which DCT coefficients are quantized using a quantization table, and thus, quantized DCT coefficients are obtained. In a...
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5805735 |
Method and apparatus for compression of digitized image data using variable color fidelity
The present invention is directed to systems and methods for compressing image data without segregating the image data into scanned and non-scanned components, while at the same time, improving...
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5802213 |
Encoding video signals using local quantization levels
Video signals are encoded by dividing a current video frame into regions and generating a local complexity measure and a local quantization level for each region, where the local quantization level...
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5793896 |
Ordering corrector for variable length codes
A computer-implemented method for encoding symbols of a current message with a variable-length code. According to a preferred embodiment, the statistics of the current message, are analyzed,...
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5793892 |
Method and system for compressing a pixel map signal using dynamic quantization
A pixel map signal is converted into a coefficient signal of block coefficient signals, each representing the pixels in a pixel map block (420) in a pixel map (410) with the coefficients in a...
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5793895 |
Intelligent error resilient video encoder
A method and apparatus for compressing video data to improve its tolerance to error, especially with a low bit rate network. With this invention video data is divided into a number of frames and...
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5790695 |
Image coding device for coding image signal to reduce the amount of the information in the image
An image coding device for coding image data includes a motion inter-frame compensation predicting unit for predictively coding an image signal at each frame based on an input image signal and a...
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5786857 |
Image processing system
An image-processing system in which harmful noises of image compression are effectively removed. The image processing system includes a transformation device for receiving m pixels×n lines of...
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5787199 |
Apparatus for detecting a foreground region for use in a low bit-rate image signal encoder
An apparatus, for use in a low bit-rate image signal encoder, for detecting a foreground region in an image signal, wherein the image signal has a number of objects therein and the foreground...
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5777749 |
Method and device for compressing bit-map data
The present invention relates to a bit-map compressing method and a bit-map compressing device. The bit-map data compressing method includes a main scanning step for scanning bit-map data in a main...
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5778092 |
Method and apparatus for compressing color or gray scale documents
A technique for compressing a color or gray scale pixel map representing a document. The pixel map is decomposed into a three-plane representation, a reduced-resolution foreground plane, a...
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5778102 |
Compression embedding
A method and apparatus for embedding auxiliary information into the digital representation of host data created by a lossy compression technique and a method and apparatus for constructing...
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5778099 |
Picture block motion detecting apparatus
The invention selects a plurality of search ranges so that picture block motion detection can be controlled by feed forward sequence. A picture block motion detecting apparatus obtains an activity...
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5774635 |
Procedure for controlling printing quality
Prior to printing a plurality of measuring points are specified from the digital presentation of the page original on the basis of given initial data. The initial data for the measuring points are...
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5774594 |
Signal compression device
Blocking means subjects pixel information of an original sample surface to blocking, a DCT circuit transforms the blocks of input data, a quantizer quantizes the DCT-treated data, a VLC circuit...
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5771316 |
Fade detection
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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5768436 |
Device and method for coding video pictures
The picture quality of an MPEG-encoded video signal is improved considerably by reducing the coefficients after quantization in such a way that the "Lagrangian cost" D+λR (D is distortion, R is...
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5768431 |
Video data compression
Video data compression apparatus in which successive groups of two or more images are encoded, each encoded group of images including at least one intra-image encoded image and at least one...
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5764800 |
Image data re-compression device
An actual recordable area in which no image data has been recorded is detected from a recording medium. The actual recordable area is divided by a file size of image data which are compressed with...
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5761438 |
Apparatus for measuring the amount of traffic of a network at a predetermined timing and compressing data in the packet without changing the size of the packet
In a communication method and apparatus, the load of a network is reduced by compressing data or changing the data compression method in accordance with a busy state of the network. A network's...
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5761345 |
Image processing apparatus suitable for multistage compression
An image processing apparatus initially stores variable length codes corresponding to a significant frequency component, and variable length codes corresponding to a less significant frequency...
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5757967 |
Digital video decoder and deinterlacer, format/frame rate converter with common memory
A video decoder/format/frame rate converter with common memory is provided. This device decodes a compressed, interlaced video stream and converts the decoded output to a non-interlaced format...
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5758042 |
Lossy and lossless compression in raster image processor
Digital input commands defined in a page description language are separated in two types of instructions: first instructions resulting in solid regions on the printed output and second instructions...
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5748789 |
Transparent block skipping in object-based video coding systems
A method implemented in an object-based video encoder or decoder uses shape information that describes the boundary of a group of pixels representing an object in a sequence of video frames to...
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5745251 |
Image processing method and apparatus for encoding variable-length data
An image processing apparatus comprising: a first coding device for coding input image data into code data having a variable length; a second coding device for coding code data having the variable...
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5745245 |
Communication apparatus
The facsimile machine codes image data in order to reduce the data size to be transmitted. In coding an image data, an adaptive template pixel is referred to whose position relative to the pixels...
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