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| Number | Title | Issue Date |
| 7995650 | Picture coding method, picture decoding method, picture coding apparatus, picture decoding apparatus, and program thereof The picture coding method according to the present invention is a picture coding method for coding a picture on a block-by-block basis through orthogonal transformation and quantization, and coding a quantization matrix that is used to derive quantization steps for ... | 08/09/2011 |
| 7912122 | Picture coding method, picture decoding method, picture coding apparatus, picture decoding apparatus The picture coding method according to the present invention is a picture coding method for coding a picture on a block-by-block basis through orthogonal transformation and quantization, and coding a quantization matrix that is used to derive quantization steps for ... | 03/22/2011 |
| 7881373 | Video data compression apparatus and method of same A video data compression apparatus with which compressed video data of suitable amounts of data can be produced and the time required for processing is short. The apparatus approximates a real difficulty data Dj indicating the difficulty of the pattern of... | 02/01/2011 |
| 7804897 | Method for implementing an improved quantizer in a multimedia compression and encoding system Some embodiments limit the changes to a buffer occupancy accumulator with respect to a target number of bits of the current frame. Limiting the change of the buffer occupancy accumulator will prevent one odd significantly different frame from significantly changing ... | 09/28/2010 |
| 7801214 | Method and apparatus for controlling encoding rate and quantization scales A data processing apparatus able to generate encoded data able to give a high quality decoded image, wherein a Q-calculation circuit specifies a bit rate by which the encoded data is decoded at the time of decoding based on encoded data, then the Q-calculation circu... | 09/21/2010 |
| 7782940 | Methods for encoding or decoding in a videoconference system to reduce problems associated with noisy image acquisition Disclosed herein in one embodiment is an adaptive coding threshold algorithm for a videoconference system which alleviates problems due to the erroneous recoding of stationary areas of images caused by image noise. The algorithm, which is preferably implementable on... | 08/24/2010 |
| 7535959 | Apparatus, system, and method for video encoder rate control A video encoder includes a programmable rate controller. In one embodiment, the programmable rate controller includes a variable bit rate controller, a constant bit rate controller, and an arbitration logic for selecting one of the two outputs. An embodiment of a va... | 05/19/2009 |
| 7457360 | Method and apparatus for encoding image data with pre-encoding scheme, and method and apparatus for recording video using the same An encoding apparatus includes a pre-encoding unit that performs learning based on input image data from before starting a video recording; and an encoding unit that encodes image data using an encoding parameter. The pre-encoding unit includes an image input unit; ... | 11/25/2008 |
| 7436890 | Quantization control system for video coding The present invention provides a quantization control system for video coding, for optimizing bit allocation based on visual priority which expresses at high precision human visual characteristics for videos, thereby improving subjective image quality of the whole i... | 10/14/2008 |
| 7418037 | Method of performing rate control for a compression system A rate controller for allocating a bit budget for video frames to be encoded is disclosed. The rate controller of the present invention considers many different factors when determining the frame bit budget including: desired video quality, target bit rate, frame ty... | 08/26/2008 |
| 7397855 | Rate controlling method and apparatus for use in a transcoder A rate controlling method for computing a reference quantization parameter is provided, for use in a transcoder having a variable length decoder, an inverse quantizer, a quantizer and a variable length encoder. The rate controlling method comprising: receiving an in... | 07/08/2008 |
| 7391807 | Video transcoding of scalable multi-layer videos to single layer video A method transcodes a compressed multi-layer video bitstream that includes a base layer bitstream and an enhancement layer bitstream. The base and enhancement layers are first partially decoded, and then the partially decoded signals are combined with a motion compe... | 06/24/2008 |
| 7373004 | Apparatus for constant quality rate control in video compression and target bit allocator thereof An apparatus for constant quality rate control in moving picture compression. First, a total activity measure for the current picture to be encoded in a set of consecutive pictures is calculated. Based on the total activity measure of the current picture and an acti... | 05/13/2008 |
| 7365775 | Image compression apparatus and method, image regeneration apparatus, camera and camera system A process and apparatus for displaying and recording image data can be smoothly performed in characteristic methods by computing a quantization parameter for use in compression of image data, obtaining a difference in the amount of processes between the display of i... | 04/29/2008 |
| 7356191 | Image encoding apparatus and method, program and recording medium In an image encoder is provided, including a to-be-encoded object prediction unit which counts quantization coefficients which are newly made significant, for example, when each bit plane is encoded, on the basis of quantization coefficient for each bit plane in all... | 04/08/2008 |
| 7352811 | Data encoding apparatus and method A data encoding apparatus operable to encode a plurality of data blocks produces encoded data in accordance with at least one of a selectable target data quantity or a selectable target data quality. The apparatus comprises a plurality of encoding processors at leas... | 04/01/2008 |
| 7346219 | Methods and devices for encoding and decoding images using nested meshes, programme, signal and corresponding uses The invention concerns a method for encoding at least a source image using a hierarchical mesh defining at least two nested spaces corresponding each to a decomposition level of said meshing, which consists, at least at a decomposition level n (except the first deco... | 03/18/2008 |
| 7327785 | Noise reduction method, apparatus, system, and computer program product A video coding apparatus, method, and computer program product for removing transform coding noise especially in flat areas of a frame, which appears as remaining parts of moving objects in a video picture. Transform coding noise is removed by forcing a macroblock t... | 02/05/2008 |
| 7327786 | Method for improving rate-distortion performance of a video compression system through parallel coefficient cancellation in the transform A method for improving rate distortion performance of a compression system through parallel coefficient cancellation in a transform comprising the steps of (A) determining a block sum of absolute values for each of a plurality of blocks in a macroblock and (B) setti... | 02/05/2008 |
| 7321618 | PCM upstream data transmission server A method for designing an equalizer and tracking performance for upstream PCM in a digital communications network is described. The invention optimizes upstream data rate rates for data transmissions in a network between a client modem a server modem. During trainin... | 01/22/2008 |
| 7302000 | Method and system for two-pass video encoding using sliding windows A method for two-pass video encoding using sliding windows. The method receives a video sequence (VS), selects a portion of frames in the VS from the beginning as an analysis window, encodes each frame in the analysis window to acquire multiple statistical features,... | 11/27/2007 |
| 7295610 | Hybrid rate control in a digital stream transcoder A rate controller in run-level domain transcoder, which receives a stream of compressed frames carried in a bit stream, selectively determines whether to quantize and/or threshold portions of a frame carried in the stream of frames. The rate controller determines th... | 11/13/2007 |
| 7295971 | Accounting for non-monotonicity of quality as a function of quantization in quality and rate control for digital audio An audio encoder regulates quality and bitrate with a control strategy. The strategy includes several features. First, an encoder regulates quantization using quality, minimum bit count, and maximum bit count parameters. Second, an encoder regulates quantization usi... | 11/13/2007 |
| 7292731 | Image encoder, image decoder, image encoding method, and image decoding method The image coding apparatus is constituted comprising an atom extraction section 109 for acquiring position data indicating the positions of atoms of prediction residual data in macroblocks, for each of the macroblocks; and a variable length encoding section | 11/06/2007 |
| 7292736 | Methods and systems for complexity-based process blending Embodiments of the present invention comprise methods and systems for image complexity estimation and selective complexity-based image processing. ... | 11/06/2007 |
| 7289676 | Image processing apparatus, image processing method, image processing program, and recording medium Activities are normalized corresponding to a characteristic of a pattern of a frame. The picture quality is optimized by adaptive quantization. A normalized activity norm_act [m] of each macro block is obtained with an average activity avg_act of the frame and the a... | 10/30/2007 |
| 7286165 | Image pickup apparatus with a variable length encoder and data quantity monitor This invention is a digital still camera having a coded data quantity monitoring circuit (9). This monitoring circuit (9) detects the quantity of data of an image signal compressed by a JPEG compression circuit (7). When a CPU (10) judges... | 10/23/2007 |
| 7280597 | System and method for determining coding modes, DCT types and quantizers for video coding A method encodes a video by first measuring a variance of pixel intensities in a current frame. A number of bits to encode the current frame is assigned according to rate and buffer fullness constraints. A multiplier value is determined directly as a function of onl... | 10/09/2007 |
| 7277483 | Method and apparatus for rate control for constant-bit-rate finite-buffer-size video encoder A method and apparatus for rate control for a constant-bit-rate finite-buffer-size video encoder is described. Rate control is provided by adjusting the size of non-intra frames based on the size of intra frames. A sliding window approach is implemented to avoid exc... | 10/02/2007 |
| 7277484 | Image coding and decoding method and apparatus considering human visual characteristics An image coding method and apparatus considering human visual characteristics are provided. The image coding method comprises (a) modeling image quality distribution of an input image in units of scenes such that the quality of an image input in units of scenes is g... | 10/02/2007 |
| 7277489 | Two dimensional discrete wavelet transforms The method performs a two-dimensional discrete wavelet transform on an image. The image comprises a plurality of blocks of pixels. The method generates (340) a current output block of subband data corresponding to a current block. The current output block is ... | 10/02/2007 |
| 7269219 | Non-linear quantizer for video coding A quantizer and dequantizer for use in a video coding system that applies non linear, piece-wise linear scaling functions to video information signals based on a value of a variable quantization parameter. The quantizer and dequantizer apply different non linear, pi... | 09/11/2007 |
| 7266150 | Interpolation of video compression frames A method, system, and computer programs for improving the image quality of one or more predicted frames in a video image compression system, where each frame comprises a plurality of pixels. A picture region or macroblock of certain types of frames can be encoded by... | 09/04/2007 |
| 7266252 | Methods and systems for complexity-based variable process selection and application Embodiments of the present invention comprise methods and systems for image complexity estimation and selective complexity-based image processing. ... | 09/04/2007 |
| 7266253 | Methods and systems for complexity-based process selection Embodiments of the present invention comprise methods and systems for image complexity estimation and selective complexity-based image processing. ... | 09/04/2007 |
| 7263125 | Method and device for indicating quantizer parameters in a video coding system A method and device for coding of digital video sequence, wherein an indication of quantization parameter (QP) is provided in the encoded bit-stream for decoding purposes. The QP related information is indicated by introducing a sequence level quantization parameter... | 08/28/2007 |
| 7263234 | System and method for video encoding according to degree of macroblock distortion The invention relates to a video image encoding method for distributing a bit rate to a target macroblock in a digital image while performing video image encoding. Choose a comparison area in the digital image according to the location of the target macroblock in th... | 08/28/2007 |
| 7263126 | System and method for transcoding with adaptive bit rate control A system and method are provided for adaptive rate control in the transcoding of video streams. The method comprises: accepting frames of an input MPEG encoded video stream; decoding the video stream; determining video stream complexity; for each frame, calculating ... | 08/28/2007 |
| 7257264 | Image processing apparatus and method for compression-encoding image area information From inputted multilevel image data it is generated, for each pixel, image area information constituted by an image area component indicating whether the pixel exists in a character•line drawing area or halftone area and an image area component indicating whether ... | 08/14/2007 |
| 7254176 | Apparatus for variable bit rate control in video compression and target bit allocator thereof An apparatus for variable bit rate control in moving picture compression. First, a total activity measure for the current picture to be encoded in a set of consecutive pictures is calculated. Based on the total activity measure of the current picture and an activity... | 08/07/2007 |
