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| Number | Title | Issue Date |
| 7130469 | Image processing apparatus, image processing method, program, recording medium, and image forming apparatus having the same An edge pixel is extracted from an input image by an edge determination section, an object image section is extracted by an object-image extraction section, and a first characteristic amount of the object image section in a first local pixel block containing a first... | 10/31/2006 |
| 7068328 | Method, apparatus and recording medium for image processing The sense of contrast perceived by a viewer of an image is quantified and adequate image processing is carried out on image data based on the sense of contrast. Contrast-sense quantification means generates unsharp image data of the image data and then generates a h... | 06/27/2006 |
| 7031535 | Image processing apparatus capable of interpolating error data This invention provides an image processing apparatus which receives an image signal divided into a plurality of different subband components, detects an error in low-frequency subband component data within the image signal of one picture, and interpolates remaining... | 04/18/2006 |
| 6947060 | Image forming apparatus, electron beam apparatus, modulation circuit, and image-forming apparatus driving method An image forming apparatus which performs pulsewidth modulation with a pulsewidth set by counting a clock. Especially, for grayscale level correction by setting the frequency of the clock, the periodic clock is counted, and an output pattern is changed in accordance... | 09/20/2005 |
| 6788811 | Coding apparatus, decoding apparatus, coding method, decoding method, amd computer-readable recording medium for executing the methods A coding apparatus which can simplify a coding circuit and also simplify the processing of quantization. Image data that consists of R-, G-, and B-color components read from a scanner into buffers is subjected to transformation using a position correlation for each ... | 09/07/2004 |
| 6768518 | Method and apparatus for removing a checkerboard-like noise artifact from a captured composite NTSC video frame A wavelet domain filtering technique is disclosed that removes or at least minimizes checkerboard-like noise artifacts that result from capturing a composite NTSC video signal. A Haar basis filter bank is used to obtain a two-level wavelet decomposition. Low-pass fi... | 07/27/2004 |
| 6637031 | Multimedia presentation latency minimization To obtain real-time responses with interactive multimedia servers, the server provides at least two different audio/visual data streams. A first data stream has fewer bits per frame and provides a video image much more quickly than a second data stream wi... | 10/21/2003 |
| 6493023 | Method and apparatus for evaluating the visual quality of processed digital video sequences A Digital Video Quality (DVQ) apparatus and method that incorporate a model of human visual sensitivity to predict the visibility of artifacts. The DVQ method and apparatus are used for the evaluation of the visual quality of processed digital video seque... | 12/10/2002 |
| 6160845 | Picture encoding device, picture encoding method, picture decoding device, picture decoding method, and recording medium A compressed picture signal having a number of pixels smaller than the number of pixels of an original picture signal is generated, and plural patterns of prediction pixels are formed by using neighboring pixels of as notable pixel which is one of pixels ... | 12/12/2000 |
| 6067383 | Coding method, coding apparatus, wavelet transform apparatus, and wavelet reverse transform apparatus A coding method comprises a hierarchical coding step of performing hierarchical coding for data to be coded to generate first and second code sequences, each comprising a plurality of code layers; a storage control step of storing the first and second cod... | 05/23/2000 |
| 6055017 | Adaptive scanning technique for efficient wavelet video coding A wavelet video coding method using adaptive scanning includes subjecting the input video signal to a horizontal and a vertical wavelet decomposition to obtain base, horizontal, vertical and diagonal bands of wavelet coefficients; recursively subjecting t... | 04/25/2000 |
| 5966183 | Signal converter and signal conversion method The present invention relates to a signal converter and a signal conversion method in which an interpolated image is formed on the basis of suitable classification according to features of an input image signal to obtain a high-definition image signal. In... | 10/12/1999 |
| 5742704 | Image coding apparatus capable of coding in accordance with an image type A one-block extracting section extracts a pixel block from an input image signal. An area judging section calculates characteristic quantities such as variance information, histogram information and dynamic range information, and judges whether the pixel ... | 04/21/1998 |
| 5729828 | Frequency processing circuit with lower sideband suppression and emphasis A frequency processing circuit has a suppressing circuit for suppressing a lower sideband wave of an input FM signal whose frequency is modulated, a frequency conversion circuit for converting the frequency of an output of the suppressing circuit, and an ... | 03/17/1998 |
| 5604602 | Process and device for bite-rate reduction for the recording of images on a video recorder A method comprising breaking an image down into sub-bands, performing a pre-analysis of the image in image blocks, recursively and adaptively assigning the available bit-rate to each pixel in the sub-bands, selecting a quantizer determined by the source p... | 02/18/1997 |
| 5596418 | Deemphasis and subsequent reemphasis of high-energy reversed-spectrum components of a folded video signal A system for reproducing a luminance signal from a medium containing a previously recorded luminance signal with a high-frequency portion thereof compressed in dynamic range includes a circuit for recovering that luminance signal from the medium. Filterin... | 01/21/1997 |
| 5485215 | HDTV raster converter and interpolation filter with section overlap A system and method for filtering a digital signal having a relatively high data rate uses circuitry which operates at a lower data rate. The filter includes an input section which receives the input signal and which divides the input signal into a plural... | 01/16/1996 |
| 5367334 | Video signal encoding and decoding apparatus An encoding and decoding apparatus for a video signal and a high-definition television signal is disclosed. For the picture A having the horizontal to vertical screen frame ratio of 4:3, the picture B having the horizontal to vertical screen frame ratio o... | 11/22/1994 |
| 5243629 | Multi-subcarrier modulation for HDTV transmission A high definition television (HDTV) signal is transmitted by a multi-subcarrier transmission scheme in which each subcarrier is used to carry a different class of HDTV information.... | 09/07/1993 |
| 5174641 | Video encoding method for television applications Continuously monitoring successive frames of a video signal and deciding, based on the similarity between the frames, whether to encode one of them with low or high information content, i.e., as a "low-resolution" frame or a "high-resolution" frame, and w... | 12/29/1992 |
| 5150432 | Apparatus for encoding/decoding video signals to improve quality of a specific region An image encoding apparatus comprises a region detecting circuit for detecting a specific region from input image signals and outputting the region specifying signal for discriminating the specific region from other regions, a low-pass filter for selectiv... | 09/22/1992 |
| 4720751 | Video recording apparatus which records chrominance information at a lower frequency band coincident with the luminance signal frequency band The present invention provides a transmission method denoted as the "color shift" method. Therein the composite color video signal, which is formed by a sequence of analog line signals, is sampled, as a result of which each analog line signal is converted... | 01/19/1988 |
| 4472733 | Color channel signal-to-noise improvement in digital television Circuitry included in a TV receiver for enhancing the signal-to-noise ratio of the chrominance signal includes an adaptive linear phase, low pass filter which has its bandwidth controlled responsive to the upper frequency components of the current chromin... | 09/18/1984 |
| 4429327 | Compatible television system with increased vertical resolution A television arrangement generates signals from independent pairs of adjacent lines. The signals are separately summed and differenced to produce S and Ɗ signals. The S signal is representative of the luminance of a scan between the original scans, and t... | 01/31/1984 |
| 4063290 | Video recording apparatus Apparatus for directly recording television signals on a magnetic medium strips out sync and blanking information. Low frequency components of the television signals are time compressed, i.e. frequency shifted, and recorded as a substitute for the strippe... | 12/13/1977 |
