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| Number | Title | Issue Date |
| 5699172 | Image forming apparatus and method having a toner and ink saving feature An image forming apparatus that is capable of saving developing agents such as toner and ink by reducing the number of dots in an image while ensuring that the characters and figures in the image are nonetheless represented distinctly. Bit map data is rea... | 12/16/1997 |
| 5699459 | Image compression device and a method of image compression The present invention provides an image compression device for performing an image compression process for each one of a plurality of blocks into which an original image picture is divided, the device including image correction section for generating a co... | 12/16/1997 |
| 5696851 | Codeword-dependent post-filtering for vector quantization-based image compression The quality of reconstructed images is improved by a post-processing method at the decoder which uses codeword-dependent, spatially-varying 2-dimensional filters. The post-filtering, working across block boundaries, reduces coding artifacts and increases ... | 12/09/1997 |
| 5694489 | Image signal processing apparatus with no change of signal processing mode in compression/expansion processing loop A DCT circuit converts a specific block scanning signal into DCT coefficients. An encoder quantizes and Huffman-codes the image signal converted into DCT coefficients to compress it. A code memory stores the compressed image data obtained by quantizing an... | 12/02/1997 |
| 5694492 | Post-processing method and apparatus for removing a blocking effect in a decoded image signal A post-processing method and apparatus is capable of improving the image quality of a decoded image signal by effectively reducing or removing a blocking effect in the decoded image signal. Decoded image data is first stored in a memory and target pixel d... | 12/02/1997 |
| 5687258 | Border treatment in image processing algorithms A border treatment is supplied to an image which is to be processed by using an algorithm operation on a neighborhood surrounding each image pixel of the image. The border provides a high frequency high contrast area which appears to the image processing ... | 11/11/1997 |
| 5590222 | Image signal processing apparatus utilizing a 2D Haar transform and adaptive selection of images based on a parameter such as a ratio of coefficients for reducing block distortion and method thereof A technique for processing a decoded image signal having a distortion obtained by decoding coded data by utilizing a two-dimensional inverse orthogonal transformation in which the coded data is obtained by coding an image signal by utilizing a two-dimensi... | 12/31/1996 |
| 5590064 | Post-filtering for decoded video signals Encoded video signals comprise sets of transform coefficients (e.g., DCT coefficients) corresponding to different regions of a video frame. An inverse transform is applied to sets of transform coefficients to generate decoded regions of a decoded video fr... | 12/31/1996 |
| 5583646 | Apparatus for distinguishing image portions through image expansion An image processing apparatus for performing predetermined processing on an image of a document having a character/line portion, a gradation portion and a background portion. The apparatus reads the document image, converts image densities to binary pixel... | 12/10/1996 |
| 5566253 | Method, a device and apparatus for processing values corresponding to measurements of pixels, and a facsimile system and a data processing system A device for processing values corresponding to measurement of pixels, includes an input inputting a j th primary density information Xj representing density information of the j th pixel of an image, where the j th pixel includes a part which ... | 10/15/1996 |
| 5555029 | Method and apparatus for post-processing decoded image data A post-processing filter apparatus for use in an image signal decoding system, capable of improving the image quality of the system, comprises a memory for storing decoded image data of a current frame; a controller for assigning each pixel value included... | 09/10/1996 |
| 5495538 | Segmentation-based JPEG image artifacts reduction A method for reducing ringing and blocking artifacts in a decompressed image models an image in a relatively small area as several smooth regions separated by edges. The method uses JPEG MxM pixel blocks and is compatible with JPEG decompression. To reduc... | 02/27/1996 |
| 5493416 | Method combining error diffusion and traditional halftoning with arbitrary screen orientation A block-based error diffusion technique allows for the printing of colored images having arbitrary screen orientations. The technique improves reproducibility by only compensating for errors arising from quantization in selected "critical blocks".... | 02/20/1996 |
| 5454051 | Method of reducing block artifacts created by block transform compression algorithms A method of improving image quality when using block transform image compression algorithms by applying a variable lowpass filter (blur) operation on block boundaries that is based on the coefficients of the transformed data. The method of reducing block ... | 09/26/1995 |
| 5384849 | Apparatus and method for encoding/decoding data including the suppression of blocking artifacts A method and apparatus for removing blocking artifacts in an encoder/decoder system. The encoder includes a delay device for delaying original input frame data, a decoder for decoding the compressed data and outputting the restored frame data, and a block... | 01/24/1995 |
| 5373568 | Apparatus for image transformation In an apparatus for position transformation of input image data according to a transformation function to thereby generate image data at the position of each pixel of an output image, it is detected whether or not each position is located inside the bound... | 12/13/1994 |
| 5337159 | Image data smoothing method An image data smoothing method smooths image data representing a picture transmitted by a facsimile transmitter and received by a facsimile receiver in the normal mode in printing out the image data so that curves and oblique lines of the picture are repr... | 08/09/1994 |
| 5333211 | Image processing apparatus for preventing occurrence of moire in a reconstructed image An image processing apparatus for image compression and decompression includes a smoothing part for smoothing image data of a reconstructed image by using a smoothing filter selected from among a plurality of smoothing filters having different smoothing e... | 07/26/1994 |
| 5329380 | Image processing machine An image processing machine processes image data of a letter document into binary data which are then put through smoothing-out processing, and image data of a photograph document into binary data by a method in which the optical density of a document is ... | 07/12/1994 |
| 5229864 | Device for regenerating a picture signal by decoding A device for decoding digital picture data coded by compression to thereby regenerate original picture data has a decoding section for decoding the digital picture data. A reverse normalizing section reversely normalizes picture data outputted by the deco... | 07/20/1993 |
| 5220616 | Image processing A method of digitally processing images, in the form of a two dimensional data element array, in which the image is compressed by dividing the array into blocks (2) and performing transformation thereon. In order to smooth discontinuities at the boundarie... | 06/15/1993 |
| 5187754 | Forming, with the aid of an overview image, a composite image from a mosaic of images A method for generating a composite terrain map, proceeding from an overview taken at relatively high altitude and photographs taken at relatively low altitudes, generates a composite terrain map that is relatively free of step irradiance variations where... | 02/16/1993 |
| 5185808 | Method for merging images An imagery data mechanism for controllably merging separate, digitally formatted and arbitrarily shaped images eliminates overlap-edge artifacts by gradually blending a paste image (40) along its border (44) with a base image (30), regardless of the shape... | 02/09/1993 |
| 5173952 | Image filtering system performing transform coding of image data other than boundary picture elements of adjoining blocks An image filtering system includes a storage device for storing image data which are partitioned into blocks composed of a predetermined number of picture elements for an orthogonal transform and represent an entire input image therein, an address selecti... | 12/22/1992 |
| 5151787 | Method and circuit for correcting image edge An edge correction circuit and method for enhancing image definition by reducing a conversion time at an region of a luminance signal in a digital image processor, said method including the steps of and the circuitry for: (a) generating a first control si... | 09/29/1992 |
| 5121447 | Apparatus for performing gradation processing on image data Image processing apparatus having an input device for inputting the data of an objective pixel, calculator for obtaining an average density value in a specified region and a quantizer for quantizing the data of the objective pixel based on the average den... | 06/09/1992 |
| 5101452 | Apparatus and method for dynamic step quantization The apparatus and method of the present invention operates upon the problem of contouring that is encountered in the digital image processing field. The preferred apparatus embodiment of the invention forms quantizing steps that vary in size during the pr... | 03/31/1992 |
| 4860373 | Location dependent signal processor A location dependent signal processor for radiant energy detector arrays which include two-dimensional spatial filtering and/or background normalizing, with means providing programmed control of the signal processor filter weighting and normalizer thresho... | 08/22/1989 |
| 4797942 | Pyramid processor for building large-area, high-resolution image by parts A technique, employing image-processing pyramids, which is capable of combining a plurality of small-area high-resolution sub-images, such as may be derived from an array of television cameras, into a single large-area high-resolution image, with substant... | 01/10/1989 |
| 4786976 | Image processing apparatus An image processing apparatus comprises a memory for storing image data of each of a plurality of blocks of an input image data, a buffer for delaying the input image data and a processor for processing the image data supplied from the buffer in a process... | 11/22/1988 |
| 4754492 | Method and system for adapting a digitized signal processing system for block processing with minimal blocking artifacts A method and apparatus for processing n-dimensional digitized signals containing at least two adjacent blocks of digitized sample values. The digitized signal is transformed in accordance with a spatial transform operator. The spatial transform operator i... | 06/28/1988 |
