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5859926 |
Device and method for data coding and decoding
A data coding device codes input object color pixel data into coded data. The data coding device includes a parallel/serial converter that converts the object color pixel data composed of parallel...
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5859931 |
Image compression and decompression using predictive coding and error diffusion
An encoding/compression technique using a combination of predictive coding and run length encoding allows for efficient compression of images produced by error diffusion.
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5854857 |
Using encoding cost data for segmentation and background suppression in JPEG-compressed images
An enhancement to the standard JPEG image data compression technique includes a step of recording the length of each string of bits corresponding to each block of pixels in the original image at...
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5832124 |
Picture signal coding method and picture signal coding apparatus, and picture signal decoding method and picture signal decoding apparatus
Apparatus and method for coding a moving picture signal and decoding a coded moving picture signal. The input picture signal of higher resolution is down-sampled at respective ratios in the...
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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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5828848 |
Method and apparatus for compression and decompression of video data streams
A video image data field to be compression-encoded is divided into rectangular blocks. Each of the rectangular blocks is compared with a corresponding block of a reference image to generate...
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5825929 |
Transformation block optimization method
A transformation block optimization method provides transformation blocks of variable size for video compression processes. The method includes defining a transformation block of multiple pixels in...
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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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5822541 |
Compressed video data amount reducing device, compressed video data amount reducing system and compressed video data amount reducing method
According to a data amount reducing device for reducing the data amount of compressed video data in which the compressed video data has a format having a control information portion comprising...
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5812787 |
Video coding scheme with foreground/background separation
A computer-implemented method and apparatus for encoding pictures of a sequence of pictures. According to a preferred embodiment, an encoding system determines a relatively fixed background of the...
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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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5796872 |
Method and apparatus for compressing and decompressing image data
A first comparator compares pixel data outputted by a pixel-data generating unit with an immediately preceding item of pixel data that has been latched by a first latch. The result of comparison is...
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5793894 |
Image data editing apparatus and decoding apparatus
An image data editing apparatus edits image data coded based on inter-image prediction. Outputted are number data for specifying image data read from a recording medium and edition point data...
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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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5782429 |
Video compression for missile terminal guidance
A method and apparatus for improving aim point accuracy in a programmable flight control missile includes a communication system for receiving at least one frame of imagery in a vision system...
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5781136 |
Digital information encoding device, digital information decoding device, digital information encoding/decoding device, digital information encoding method, and digital information decoding method
A digital information encoding device used in a QM-Coder comprises a context table storage means for storing a plurality of storing data comprising a prediction symbol and an LSZ data, an...
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5778097 |
Table-driven bi-directional motion estimation using scratch area and offset valves
A prediction block is generated using a first region of a first reference frame and a second region of a second reference frame. A current block of a current frame is compared to the prediction...
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5774590 |
Image data reproducing apparatus
An apparatus for reproducing original image data from compressed image data, supplied thereto as a plurality of separate data blocks, each data block including a plurality of compressed pixel data...
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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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5768433 |
Picture compression circuit
A picture compression circuit includes a video memory and an encoding unit connected to the video memory in order to read a picture by macroblocks to subject these macroblocks to a discrete cosine...
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5764805 |
Low bit rate video encoder using overlapping block motion compensation and zerotree wavelet coding
An apparatus and a concomitant method for encoding video frame sequences (input images) using overlapping block motion compensation in conjunction with zerotree wavelet coding. The method...
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5764804 |
Data encoding and decoding system
A data encoding system for encoding input color pixel data and outputting encoded data. The data encoding system includes a reference pixel generating device which outputs reference pixel data...
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5751859 |
Compression of text images by soft pattern matching
Bilevel textual images are compressed by segmenting the image into marks (401) and then coding each mark using a soft pattern matching method. Each mark is compared (403) with the marks in a...
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5751860 |
Method for compressing and decompressing digital image data
A compressing method consisting of generating a predicted value for the pixel of the digitized image to be compressed based on the values of at least two neighboring pixels is provided. After...
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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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5732155 |
Compression coding device and expansion reproducing device for a picture signal
A device for coding picture data by compression has a button circuit and a controller. When a button included in the button circuit is pushed by hand to enter a still picture mode command, the...
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5727088 |
Error concealment method in a B-picture
When a data error is generated in a macroblock in a Bidirectionally-predictive coded picture (i.e., a B-picture), error concealment is performed on the macroblock. In the situation where the...
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5710826 |
Image encoding method
There is provided an image encoding method in a facsimile apparatus or an image filing apparatus as an image communication apparatus. In this method, a color image signal which is expressed by a...
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5703966 |
Block selection using motion estimation error
A computer-implemented method and apparatus for encoding a current block of pixels of a current picture of a sequence of pictures, the sequence of pictures comprising a previous picture having a...
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5686973 |
Method for detecting motion vectors for use in a segmentation-based coding system
A method, for use in a segmentation-based coding system, for detecting motion vectors between a current frame and a previous frame of digital video signal comprises the steps of (a) generating...
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5677980 |
Decoder for compressed digital signal
A decoder for decoding compressed data obtained through compression of digital data based on a high efficiency coding technique. The compressed data is processed in units of a predetermined amount...
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5677689 |
Fixed rate JPEG compliant still image compression
The present invention is a fully JPEG compliant two-pass approach that can compress an arbitrary image to a predetermined fixed size file. The compression coding device and method according to the...
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5668609 |
Motion detector and key signal interpolator using same
A motion detector and improved key signal interpolator using the same inputs a video signal to both a frame and a field based interpolator to produce both frame and field interpolated signals. The...
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5654805 |
Multiplexing/demultiplexing method for superimposing sub-images on a main image
A main image and at least one sub-image for superimposing on the main image are encoded in the following manner. The main image is subdivided into a plurality of main image regions that are...
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5577132 |
Image coding/decoding device
An image coding device for coding an input image of multi-level. In the image coding device, an input multi-level image is analyzed by an image analyzing portion, and update information to be used...
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5568570 |
Method and apparatus for reducing quantization artifacts in a hierarchical image storage and retrieval system
The system and method reduces the quantization artifacts in the addition and removal of a digital watermark to and from a selected resolution image of a hierarchical image storage system where the...
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5544266 |
Transcoding device
Known transcoders for compressed video signals comprise a decoder and a coder coupled thereto, between which a data signal is transmitted. Because compressed video signals comprise so-called...
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5524067 |
Image processing device employing coding with edge information preserved
An image processing device including a blocking section for dividing an input image into a plurality of blocks each consisting of N1×N2 (N1, N2: positive integers) picture elements; a block...
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5506686 |
Method and device for determining bit allocation in a video compression system
The present invention provides a method (100) and device (200) for allocating bits to video pictures in a video compression system. A sequence of video frames or pictures is received, and the...
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5491564 |
Data compression method and apparatus for binary image using Markov model encoding
A method and an apparatus for data compression suitable for the Markov model coding of mixed bunary images including documents, diagrams, halftone images and photograghs. The method is consisted of...
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5475501 |
Picture encoding and/or decoding method and apparatus
A picture encoding and/or decoding system adaptively changes encoding manner in discrete cosine transformation or predictive coding for improving a picture quality of transmission picture. A...
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5452377 |
Moving vector detecting device
A motion vector detecting apparatus using the minimum residual difference between corresponding picture elements from two consecutive frames and an interpolation circuit to develop a moving vector...
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5422734 |
Method for arithmetically encoding half-tone image in image processing system
An arithmetic coding method for encoding each pixel of image containing half-tones in an image processing system is provided. This method includes the steps of: initializing an encoder before...
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5379355 |
Data encoding using one or more adaptive decision trees
A method and apparatus for quantizing a stream of data at a predetermined bit compression ratio. A binary decision tree is established for classifying the error between a predicted and actual data...
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5363205 |
Image compressing method compressing an image into a compressed image and error coefficients
An image compression method which successively diminishes in size the image to form a compressed image. The compression is done by dividing an image into partial areas with equal size, calculating...
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5355378 |
Predictive coding device capable of coding image data signals without a discontinuity among blocks
In a predictive coding device responding to a sequence of image data signals representative of picture elements to produce a sequence of coded output signals, a plurality of provisional error...
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5333012 |
Motion compensating coder employing an image coding control method
A motion compensating coder which includes a control section for setting quantizer step size accounts for both the buffer occupancy and the texture of the image being coded. The coding control...
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5331426 |
Image encoding method
In an image encoding method in which a pixel of interest is predicted with reference to a plurality of pixels near the pixel of interest to be encoded, and encoding is performed on the basis of...
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5319463 |
Arrangement and method of preprocessing binary picture data prior to run-length encoding
An improved technique for pre-processing a picture image data signal wherein a black/white image data and a halftone image data coexists, is disclosed. The pre-processing is implemented before...
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5317397 |
Predictive coding using spatial-temporal filtering and plural motion vectors
A video coding apparatus comprises a memory for storing a coded picture signal used as a reference picture signal, a vector detecting circuit for detecting, from plural field picture signals or...
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