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| Number | Title | Issue Date |
| 6069980 | Adaptive character image generation and synthesis The present invention performs coding with little deterioration in the image quality of a character image when block coding is performed by synthesizing the character image on an image. To achieve this object, an image processing apparatus of this inventi... | 05/30/2000 |
| 6067320 | Method and apparatus for encoding and decoding images An image signal expressing pel values and a significance signal, declaring for each pel whether the pel value is significant, are supplied as input signals. By referring to the input significance signal values for the pels proximal to the pel being proces... | 05/23/2000 |
| 6052490 | Video coder employing pixel transposition A video encoding method and apparatus is shown wherein image information is represented as a plurality of pixels, the pixels are organized into blocks, pixels transposition is performed on image information at the boundaries of the blocks, the blocks are ... | 04/18/2000 |
| 6041145 | Device and method for smoothing picture signal, device and method for encoding picture and device and method for decoding picture A great decrease of a step, i.e., block distortion, of such as unnatural, abnormal or artifact brightness and color, on a block boundary, leads to much visual improvement of picture quality. Against a picture that has been encoded and decoded by block, th... | 03/21/2000 |
| 6038348 | Pixel image enhancement system and method A pixel image enhancement system which operates on color or monochrome source images to produce output cells the same size as the source pixels but not spatially coincident or one-to-one correspondent with them. By operating upon a set of input pixels sur... | 03/14/2000 |
| 6028967 | Method of reducing a blocking artifact when coding moving picture A method of coding a moving picture is provided that reduces blocking artifacts. The method can include defining a plurality of defining pixels S0, S1, and S2, which are centered around a block boundary. If a default mode ... | 02/22/2000 |
| 6023535 | Methods and systems for reproducing a high resolution image from sample data The current invention discloses methods of and systems for reproducing an original two dimensional image from data sampled at a low resolution. The data is sampled at the same frequency but at parallel displacement positions. The current invention disclos... | 02/08/2000 |
| 6016365 | Decoder having adaptive function of eliminating block effect A decoder having an adaptive function of eliminating block effect in consideration of the contents of an image includes a buffer for storing a compressed signal coming at a fixed bit rate; a variable length decoder (VLD) for variable length decoding an ou... | 01/18/2000 |
| 5995675 | Defect compensator for solid-state image pickup device A defect compensator for a solid-state image pickup device includes a vertical charge coupled device (VCCD) region for transferring signal charges produced by a plurality of optical detectors which detects an image signal of incident light, in the vertica... | 11/30/1999 |
| 5982442 | Method and filter for reducing the blocking effect in image transmission and storage For image transmission, image data is compressed block by block, and the compressed data is transmitted and decompressed. Due to an information loss during transmission, discontinuities are visible in pictures thus restored, particularly at block boundari... | 11/09/1999 |
| 5974197 | Loop filter and loop filtering method A loop filtering method and a loop filter therefor are provided. The loop filtering method includes the steps of: (a) generating a binary edge map by comparing a value obtained by operating each pixel of the image data using a predetermined one-dimensiona... | 10/26/1999 |
| 5974196 | Method and apparatus for blocking effect reduction in images An apparatus and method for post processing image data which previously was encoded using a discrete cosine transform in order to remove resulting blocking effects. Possible blocking points are examined to determine whether blocking points exist. If block... | 10/26/1999 |
| 5949917 | Block distortion corrector and image signal expander A block distortion corrector for providing to recovery image data a block distortion correcting process in which a distortion of recovery image data between neighboring image blocks is corrected, the recovery image data being recovered by an expanding pro... | 09/07/1999 |
| 5937101 | Post-processing device for eliminating blocking artifact and method therefor A post-processing device for eliminating a blocking artifact generated upon reconstructing an image compressed by block transform operation and a method thereof minimize a blocking artifact at block boundaries by selecting a predetermined discrete cosine ... | 08/10/1999 |
| 5933542 | Method and apparatus for blocking effect reduction in images by post-processing in the spatial domain An apparatus and method for post processing image data which previously was encoded using a discrete cosine transform in order to remove resulting blocking effects. Correction coefficients are generated by determining the least mean square error of the bl... | 08/03/1999 |
| 5933541 | Method for processing decoded picture blocks in a block-based method of picture coding The present invention relates to a method of filtering edges of a picture block with an edge-smoothing filter. The selection of the edge-smoothing filter depends on the size of the movement vector associated with each picture block BV to clarify the pictu... | 08/03/1999 |
| 5911007 | Image processing method and apparatus An image processing apparatus for orthogonally transforming image information in a block comprising NXN pixels, and creating block information composed of MXM pixels (N.noteq.M) on the basis of the information orthogonally transformed. The created block i... | 06/08/1999 |
| 5903681 | Reducing edge artifacts on a digital printer An arrangment is disclosed for reducing edge artifacts produced when printing a digital image on a digital printer, which printer is capable of producing multiple output levels, said digital image being represented as a rectangular array of pixels. In thi... | 05/11/1999 |
| 5883983 | Adaptive postprocessing system for reducing blocking effects and ringing noise in decompressed image signals An adaptive signal filtering method is provided to reduce blocking effects caused by decompression the block-based compressed images. The method includes the steps of generating binary edge map information by globally thresholding and locally thresholding... | 03/16/1999 |
| 5881180 | Method and apparatus for the reduction of blocking effects in images A method and apparatus to post process decompressed image data to minimize blocking effects without affecting the sharpness of the image.... | 03/09/1999 |
| 5852681 | Method and apparatus for eliminating artifacts in data processing and compression systems A method and apparatus to eliminate artifacts in data processing and compression systems.... | 12/22/1998 |
| 5852682 | Post-processing method and apparatus for use in a video signal decoding apparatus A method for post-processing a current block is used in a decoding system for decoding an encoded digital image signal. The encoded digital image signal includes a plurality of encoded blocks of quantized transform coefficients, and the current block corr... | 12/22/1998 |
| 5850475 | Method and apparatus for dividing image area In a method and apparatus for dividing an image area according to the present invention, when data of a quantized multi-gradational image are to be divided into regions according to a texture of the image, the quantized multi-gradational image data are di... | 12/15/1998 |
| 5832135 | Fast method and apparatus for filtering compressed images in the DCT domain A method is described for filtering compressed images represented in the discrete-cosine-transform (DCT) domain. The filter includes three sparse, vertical submatrices which are sparse versions of the vertical filter components (VFCs) of a desired filter ... | 11/03/1998 |
| 5828467 | Block noise prevention by selective interpolation of decoded image data An image processor for improving the quality of a picture, in which block noise arises as a result of a block encoding operation, by rendering gradations between blocks contiguous. A control point determination section reads references pixels from a decod... | 10/27/1998 |
| 5818979 | Image scanner and image scanning method using same An image scanner for reading an image data or an image scanning method using the same, wherein the image scanner includes a control circuit obtaining correction data to maintain normal continuity for the image data, by weighting or averaging a plurality o... | 10/06/1998 |
| 5819035 | Post-filter for removing ringing artifacts of DCT coding A video signal encoding/decoding system reduces ringing noise by using a post-filter which performs anisotropic diffusion on decoded data. The exemplary system uses an encoding/decoding technique such as that developed by the Moving Picture Experts Group ... | 10/06/1998 |
| 5815599 | Irreversible compression system and method for bit map images An irreversible compression system and method, includes fetching cells of bit map data from first and second adjacent blocks of bit map data, each of the fetched cells having a predetermined cell size, and each of the fetched cells is converted to compres... | 09/29/1998 |
| 5796875 | Selective de-blocking filter for DCT compressed images A method and apparatus to selectively post process decompressed image data to minimize blocking effects. Each pair of pixels across a block boundary is examined to determine whether the boundary pixels should be filtered. In one embodiment, if the differe... | 08/18/1998 |
| 5787207 | Method and apparatus for minimizing blockiness in reconstructed images Information for forming a predicted image having at least two blocks sharing a common border is evaluated to determine whether a discontinuity exists at the common border. If it is determined that a discontinuity exists at the border, the predicted image ... | 07/28/1998 |
| 5774597 | Image compression and decompression using overlapped cosine transforms An image processing apparatus and method that completely removes blocking artifacts from a compressed and restored digitized image. A compressed image is formed by windowing pixel data with a smooth window (discrete cosine transform) and then folding (wra... | 06/30/1998 |
| 5771107 | Image processor with image edge emphasizing capability An image processor is provided which emphasis-processes an image to be copied with attention to the detection of black edges so that clear color copy outputs are obtained. R, G and B data read out from an original by a scanner are converted into C, M and ... | 06/23/1998 |
| 5761392 | Process of making two adjacent uniformly colored objects appear with a diminished gap in between A process is provided for avoiding a gap between adjacent uniform color objects in an image. First, it is first determined whether the image data contains two adjacent uniform color objects, each uniform color composed of two or fewer characteristic color... | 06/02/1998 |
| 5751861 | Reducing residual artifacts in video coding schemes with integer motion compensation A computer-implemented method for decoding motion-compensated blocks of a picture of a sequence of pictures. According to a preferred embodiment, a current motion-compensation encoded block is decoded. Embedded block edges within the current block are det... | 05/12/1998 |
| 5748788 | Image processing method and apparatus A noise reduction apparatus in which decoded image data is input to a block division circuit which divides the input image into blocks each consisting of N×N pixels. A process block determination circuit determines the presence/absence of an edge from es... | 05/05/1998 |
| 5737455 | Antialiasing with grey masking techniques A method of combining antialiased edges for printing or display at a grey level reproduction device, wherein pixels have shade values determined as a function of their neighbor's shade values and mask values. Shade values are determined by processing each... | 04/07/1998 |
| 5737451 | Method and apparatus for suppressing blocking artifacts in block-transform coded images An improved method for removing blocking artifacts in regions of slowly varying intensity in an electronic image decoded from a transform coded representation of an image, includes the steps of: receiving signals indicative of DC and AC coefficient values... | 04/07/1998 |
| 5734757 | Post-processing method and apparatus for use in an image signal decoding system A post-processing filtering apparatus for use in an image signal decoding system, capable of improving the image quality of the system, comprises: memory means for storing the decoded image data of the current frame; a buffer for storing a target pixel da... | 03/31/1998 |
| 5732159 | Blocking-effect eliminating circuit for use in image signal coder/decoder A blocking-effect eliminating circuit in an image coder/decoder employs a weighted value according to the location of each pixel and the quantization step size in a block constituting an input image, to thereby reduce the blocking effect generated in a re... | 03/24/1998 |
| 5710840 | Image processing method and apparatus for adjusting the tone density of pixels based upon differences between the tone density of a center pixel and tone densities of peripheral pixels An image processing method and apparatus capable of sufficiently emphasizing binary density image area without deterioration of the image quality of a gray-scale or middle tone image area. During image processing, a density A0 of a center pixel... | 01/20/1998 |
