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7376280 |
Video encoding and decoding
A method for encoding video with a two-dimensional (2D) transform separable to two one-dimensional (1D) transforms. The method receives an array of values for a sub-section of an image, performs a...
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7372600 |
Color facsimile device with data recompressing capability
JPEG data is efficiently recompressed and transmitted to a remote color facsimile device. Before transmission of recompressed JPEG data, an anticipated transmission time is displayed for enabling...
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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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7228000 |
Image data generation with reduced amount of processing
An image data generator for generating data on a size reduced image of an original image. In one embodiment, the image data generator includes: an inverse wavelet transform unit to perform on...
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7206098 |
Method for avoiding print buffer underrun
In order to avoid print buffer under-run a printing method involves a printer printing a rendered first page of print data while another page is rendered in a connected computer. Simultaneously, a...
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7171045 |
System and method for determining a natural color depth of a digital image
A system and method for determining a natural color depth of a digital image is described. Color distances between each pair of colors in a color palette stored for a digital color image are...
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7145696 |
Print data compression method and printer driver
A printer driver software product is provided for execution by a computer to produce compressed page data corresponding to a page layout. The driver includes instructions to generate...
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7099040 |
Method for enabling a client to specify the characteristics of an image to be downloaded from a server
A method for serving an image from a server to a client, e.g., a computer having a browser or other graphics viewing engine. The user of the client first specifies a set of one or more bitmap...
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7079695 |
Digital image coding system having self-adjusting selection criteria for selecting a transform function
In a digital signal processing system, a method for selecting a transform function to apply to an input signal based on characteristics of the signal, and for self-adjusting criteria which are used...
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7068398 |
System and method for efficient tile generation from complex raster data
A system and method for accepting raster data from a Postscript or equivalent image data generator, identifying portions of the raster image which contain continuous tone data and linework data,...
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7065252 |
System and method providing improved data compression via wavelet coefficient encoding
A data compression system is provided in accordance with the present invention. The system includes a scanning component which scans at least a portion of a transformed image. The scan is performed...
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7062088 |
Variable lossy compression
Methods and apparatus for generating a compressed image from a source image by compressing the source image using a dictionary based lossy compression algorithm that regionally varies the amount of...
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7050645 |
Image processing apparatus and image processing method
The image processing apparatus transforms orthogonal transform coefficients into a predetermined number of bits for each spatial frequency, rearranges quantized data for each spatial frequency to...
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6992788 |
Image processing apparatus and method, and storage medium
The present invention efficiently compresses image data, and stores and manages the compressed data. Image data is compressed in tile unit having predetermined pixels and data packing is performed....
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6985635 |
System and method for providing a single-layer video encoded bitstreams suitable for reduced-complexity decoding
A method and system of reducing the computation load of an MPEG decoder by changing the encoding algorithms in a video-processing system are provided. During an encoding mode, a stream of data...
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6961475 |
Context model access to memory based on run and skip counts and context model skipping
A method and apparatus for coding and decoding information is described. In one embodiment, the apparatus comprises a memory and decoding hardware. The memory stores run counts and/or skip counts...
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6934420 |
Wave image compression
A method of image compression comprises the steps of recursively transforming a image using a Discrete Wavelet Transform. This creates a plurality of levels including at least a first level,...
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6792157 |
Image encoding apparatus and quantization characteristics determining apparatus
Images are to be efficiently and easily encoded while suppressing block distortion and pseudo-contour generation. A quantization characteristics determining unit receives pixel values from a pixel...
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6778709 |
Embedded block coding with optimized truncation
A multi-layer embedded bitstream is generated from a subband decomposition by partitioning each subband of the decomposition into a plurality of blocks; and encoding the blocks of each subband. The...
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6738528 |
Block noise detector and block noise eliminator
A vertical HPF and a horizontal HPF receive a video signal 101 , and extract only a high frequency component in the vertical/horizontal directions, respectively. Absolute value taking parts take...
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6738522 |
Efficient SIMD quantization method
A method of quantizing multiple input values in parallel using SIMD instructions is disclosed. In one embodiment, the method comprises (1) receiving a set of input values Xi; (2) operating on the...
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6583887 |
Method and apparatus for data compression
Compression apparatus is described that operates to select an optimum compression procedure to apply to received image data. The compression apparatus can be employed in a page printer having a...
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6222943 |
Image reading, processing and recording with quick data compression
There is disclosed an image processing apparatus in which variable-length compression is performed, e.g. by orthogonally transforming input image data in units of frames, and quantizing the...
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6198850 |
System and method for segmentation dependent lossy and lossless compression for higher quality
A method and system takes advantage of both lossy and lossless compression techniques to increase processing speed and efficiency, and to decrease required image storage space. In the system and...
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5978508 |
Two-dimensional inverse discrete cosine transformation circuit for MPEG2 video decoder
A two-dimensional inverse discrete cosine transformation circuit of an MPEG2 video decoder including a one-dimensional inverse discrete cosine transformation circuit, an input switching circuit for...
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5933537 |
Method and apparatus for conversion of frequency-coefficient matrices
A method and apparatus are disclosed for converting frequency-coefficient matrices between a configuration in which the matrices are transforms of unoverlapped image-data matrices and a...
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5923787 |
Quantization device and method, inverse-quantization device and method, and image processing device and method
A quantization device includes a multiplying unit for multiplying one of n×n values of quantization matrix information by a selected scale factor so as to provide quantization basis information....
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5905815 |
Decoding encoded image signals encoded by further transforming transformed DC signals
Image signals are encoded following a spatial decomposition pattern that is based on a selected location within the image. The resulting sequence of sets of encoded image signals may be transmitted...
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5886794 |
Picture encoding apparatus
A picture encoding apparatus and the method in which the quantization step width of the lower hierarchy data having a resolution higher than that of the upper hierarchy data is determined for each...
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5850294 |
Method and apparatus for post-processing images
The invention is an image transmitting method and system including receiving encoded images, decoding those images and post-processing the decoded images. The post-processing reduces visual...
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5768437 |
Fractal coding of data
A method of fractal coding of data and apparatus therefor, which method comprises dividing data into domains, determining a set of transformations relating the domains to the data in such a manner...
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5745607 |
Image encoding apparatus and method for generating and encoding reduced image data by bit planes
Binary color image data outputted by a color scanner is stored in three buffers for respective ones of the color components red, blue and green. First the red data in one buffer is selected by a...
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5724453 |
Image compression system and method having optimized quantization tables
A digital image compression preprocessor for use in a discrete cosine transform-based digital image compression device is provided. The preprocessor includes a gathering mechanism for determining...
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5553160 |
Method and apparatus for dynamically selecting an image compression process based on image size and color resolution
A method and apparatus which dynamically selects an image compression process for an image to be transferred from a first agent to a second agent. The image being compressed has a particular size...
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5452104 |
Adaptive block size image compression method and system
In an adaptive block size image compression method and system for compressing image data, a respective method and system for further compressing the image data for transmission. Each block and...
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5438633 |
Method and apparatus for gray-level quantization
An adaptive quantizer for digital image processing eliminates the influence of non-information anomalies, such as scratches, dust, etc. that may be present in an image in the course of determining...
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5420693 |
High-speed color image processing
This invention is to process a large quantity of color image data at high speed with minimum deterioration of image quality. One-color image data input to or output from a reader/printer unit (40)...
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5341318 |
System for compression and decompression of video data using discrete cosine transform and coding techniques
A digital video compression system and an apparatus implementing this system are disclosed. Specifically, matrices of pixels in the RGB signal format are converted into YUV representation,...
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5327502 |
Image coding system using an orthogonal transform and bit allocation method suitable therefor
A bit allocation method which facilitate control of the number of bits to be assigned to transform coefficients and block of image data with a deviation from the functional form. An image coding...
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5295203 |
Method and apparatus for vector coding of video transform coefficients
A vector coding scheme for video transform coefficients is provided. A vector is generated to identify a group of coefficients from a block of transform coefficients that qualify for transmission...
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5293251 |
Encoding/decoding system with two-stages of encoding/decoding
A compression and decompression system for transmitting facsimile images in which the facsimile image is compressed in a vertical and a horizontal direction. The compressed facsimile image is...
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5241395 |
Adaptive transform coding using variable block size
An adaptive transform coding algorithm for a still image utilizes a quadtree based variable block size discrete cosine transform to achieve a better tradeoff between bit rate and image quality. The...
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5072308 |
Communication signal compression system and method
A telecommunication system and method for communicating communication signals between various stations over a selected carrier medium. An improved encoder and method is provided for compressing a...
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5038389 |
Encoding of a picture signal in consideration of contrast in each picture and decoding corresponding to the encoding
On encoding an original picture signal comprising signal portions representative of original pictures, respectively, a contrast detecting unit (41) detects a measure of contrast in each picture in...
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4807042 |
Method of image signal encoding by orthogonal transformation
A method of image signal encoding by orthogonal transformation comprises the steps of obtaining transformed signals by conducting orthogonal transformation on two-dimensional image signals based on...
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4698689 |
Progressive image transmission
System and method of progressively transmitting and reconstructing an image in which an approximate image is reconstructed based upon partial information and details are added as additional...
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4580162 |
Adaptive picture image compression system
An image compression system wherein the image is arranged in a block 1 of elements which are Hadamard transformed 2 and then quantized 3 into sequences. The DC component is prediction 4 into a DC...
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4504860 |
Method and process for transmitting an image
A method and an apparatus for transmitting an image in which the image is sampled at a first plurality of points. The samples are then subjected to a two-dimensional unitary transform to produce a...
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4432019 |
Simultaneous amplitude sequency apparatus
A simultaneous amplitude sequency apparatus utilizing a scanner/modulator unit to scan an image and provide an analog data signal, which is digitized in an A/D converter. The digital data signal is...
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4291339 |
Facsimile transceiver
A scanner scans an original document in two orthogonal directions and produces binary data signals representing the document. An extractor combines each two scan lines into one scan line by taking...
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