264results about How to "Improve subjective quality" patented technology

Transmitting media information from a transmitting device to a receiving device. To perform the transmission a media stream is encoded and packets are formed from the encoded media stream, the packets containing application data units, the application data units having a decoding order. At least two blocks are generated from the packets. The packets of the at least two blocks are organized into a first group and a second group, the first group being decodable without reception of said second group. The transmission order of the packets of said first group is arranged succeeding packets of said second group such that the application data units in the transmission order are at least partly in a different order than the decoding order.

The invention relates to a video coding method based on a region of interest (ROI). A video coder receives the original video data of a macroblock; an ROI preprocessing module divides the macroblocks in a frame image into ROI macroblocks and non-ROI macroblocks according to the ROI predefined by a user; if the user does not define the ROI, the macroblocks in the frame are categorized by adopting an image content analyzing method; the ROI preprocessing module calculates a Lagrangian multiplier; a quantification parameter adjusting module adjusts the sensitive degree of the current macroblock and the macroblock set initial quantification parameters according to the human vision; the video coder codes the current macroblocks according to the adjusted quantification parameters; and a multiple macroblock set bit allocation module distributes the target bits for each macroblock according to the macroblock set coding statistic information after the macroblocks in the frame are completely coded, and finally calculates the initial quantification parameter of each macroblock set.

An encoder, a decoder, and corresponding methods are provided for encoding and decoding video signal data for an image block. The encoder includes a quantizer for receiving transform coefficients for the image block, and for adaptively performing dead-zone quantization based on coefficient positions and coefficient distributions of the transform coefficients.

The invention provides an HEVC (High Efficiency Video Coding) code rate control method based on region-of-interest. The HEVC code rate control method based on region-of-interest comprises the steps: generating a spatial domain significance graph of the current frame according to a GBVS (Graph Based Visual Saliency) model; generating a time domain significance graph of the current frame through motion vector information; integrating the time domain significance graph and the spatial domain significance graph by using the consistency normalization method to obtain the eventual significance graph; performing regional division for the current frame image by using the significance graph so as to divide the region into a region-of-interest and a non-region-of-interest; performing bit distribution for the region-of-interest and the non-region-of-interest respectively; performing bit distribution for each LCU in the current frame according to the significance; calculating lambda and a QP (Quantization Parameter) value according to the distributed code rate, and clipping and correcting the lambda and the QP value; and performing coding by using the eventually obtained lambda and the QP value. The HEVC code rate control method based on region-of-interest can improve the subjective quality for video coding and accurately control the output bit at the same time.

Disclosed is a method and device for realizing quantification in coding/decoding, which mainly comprises: firstly, quantification used in image switching coefficient matrix adopts quantification form of parameter model, the parameter model is a parameter model which needs only several parameters to present and it includes a frequency band distributing structure and frequency band parameters. Thereby, the quantified matrix satisfying human eye visual properties is obtained by the control of several parameters, and the subjective quality of image after coding is controlled and quantified; secondly, the method does not need to transmit or memorize the quantified matrix in codes flow, thus the coding efficiency is improved; finally, for the quantified computation of the image switching coefficients, this method can well adapt to the character of the content information in the image. Thus, this invention can improve subjective quality of the image after quantified coding.

The invention relates to a video coding method based on the vision attention, which is characterized in that the vision attention property of human eyes is introduced into the video coding; through the analysis of the local motion of macro-blocks, the intensity of the edge and the active degree of the texture, the macro-blocks can be classified into local motion macro-block, edge macro-block, smoothing macro-block and texture macro-block; the quantification parameter of the macro-blocks is adjusted based on the different attentions of human eyes to the four types of the macro-blocks. The invention has the advantages that the calculation amount is increased no more than four percent; simultaneously, the coding efficiency can be increased by ten percent; in addition, the subjective quality of the video coding can be improved.

The invention discloses a coding mode selection method for HEVC (high efficiency video coding). The method comprises the step of prejudging CTU partition mode, CU coding mode and PU interframe coding mode in the HEVC according to the space and time domain features in the current coding image content, so the traverse quantity in the mode selection in an HEVC frame is reduced. The HEVC efficiency is improved under the premise of not influencing the image coding quality. The code stream output by the method accords with the HEVC standards, the coding mode selection can be realized by further combining the perception characteristic of the vision of a human eye, and the subjective quality of the coded image is improved.

A method and apparatus is provided for implementing quantization in encoding/decoding. Firstly, the quantization on the picture transformed coefficient matrix is performed using a quantization parameter model, that is, the coefficient matrix is modeled as a parameter model represented by only several parameters, in which the parameter model includes two sorts of parameters, frequency band distribution parameters and frequency band weighting parameters. Thus, a quantization matrix conforming to the human vision system can be obtained by controlling the model parameters and the subjective quality of the encoded picture can be easily controlled. Secondly, the method does not need to store or transfer the quantization matrix in the bitstream which help to improve the encoding efficiency. Finally, the quantization on picture transformed coefficients using the method is well adapted to the content information of the picture to be encoded. Therefore, the present invention can improve the subjective quality of the encoded picture.

An apparatus for processing an audio signal having associated therewith a pitch lag information and a gain information, includes a domain converter for converting a first domain representation of the audio signal into a second domain representation of the audio signal; and a harmonic post-filter for filtering the second domain representation of the audio signal, wherein the post-filter is based on a transfer function including a numerator and a denominator, wherein the numerator includes a gain value indicated by the gain information, and wherein the denominator includes an integer part of a pitch lag indicated by the pitch lag information and a multi-tap filter depending on a fractional part of the pitch lag.

The total number of entries of an algebraic codebook is decreased by liming a random code vector generated from the algebraic codebook, and entries of a random codebook with a large number of pulses are assigned to a decreased portion. Further, the number of entries of the decreased portion is adaptively switched according to a mode.

The invention discloses a method for drawing a virtual view color image. In the method, a depth image is divided into a core content area and a non-core content area according to influence of depth coding distortion of different areas on drawing of the virtual view image, and two groups of bidirectional filters with different filtering intensities are designed to perform filter processing on a scene depth value corresponding to each pixel point of the core content area and the non-core content area respectively, so subjective quality of drawing the image is greatly improved; and then reference color information irrelative to void is extracted from the virtual view color image for color distortion problem during image fusion for depth image-based drawing, and different color correction methods are used for correcting colors of two groups of virtual view color images, so the subjective quality of drawing the image is improved.

The invention discloses a video coding and decoding method and a device using a synthetic reference frame, which uses coded image information as the reference frame and code and decodes the image frame of a successive code. The reference frame includes the synthetic reference frame which is reset and renewed by a reconstructive frame in each frame and then renewed by the reconstructive image information of a following inter-frame prediction frame according to a macro-block or a sub block of the macro-block. The renewed synthetic reference frame is used as a reference frame for the prediction during the coding of the successive image frame and is renewed continuously. The video coding and decoding method and the device of the invention can increase the accuracy of the video sequence motion estimation in video monitoring, reducing prediction errors and improving coding efficiency without the increasing of the complexity.

The invention claims a texture self-adapted video coding system, a texture self-adapted video decoding system and a texture self-adapted video coding and decoding system. The texture self-adapted video coding system includes a video coder and a coding end texture analyzer. The texture self-adapted video decoding system includes a video decoder and a decoding end texture analyzer. The texture self-adapted video coding and decoding system includes a texture self-adapted video coding system and a texture self-adapted decoding system. The texture self-adapted video coding and decoding system brings the texture feature information of video image into the video coding and decoding system to improve the compression efficiency and perceived quality of video coding.

A video coding device capable of adaptively processing input video data according to property of the data and realizing effective progressive transmission of the coded data even if image components are different in size and/or different in the number of subbands. The above-mentioned object can be realized by the provision of a transferring-order deciding and ranging portion that can prepare an integrated component unit by forming combinations of subband-based frequency-coefficients of respective components Y, U and V and can change the number of respective elements of respective components Y, U and V.

A speech signal transmission system which prevents influences of errors from propagating even after consecutive frame losses and requires no additional transmission delay. In this system, frame class information FI indicates that processing by Dec2 is carried out, and therefore a frame erasure concealment processing section (410) generates a first decoded signal Sf. Next, the internal state of a normal decoding processing section (409) is reset and a parameter storage section 414 stores first coding information F. Next, the normal decoding processing section (409) generates a second decoded signal So using second coding information f. Next, windowing sections (411,412) and an adder (413) carry out superimposed addition processing as shown in Expression (1) to generate a final output signal S.

The invention discloses a lost packet compensation method based on a frequency domain, which comprises the following steps: adopting a data recovery instrument to recover core decoding data which is corresponding to a lost frame, predicting according to the frequency domain of the discrete cosine transform MDCT coefficient which is improved at the front frame and/or the rear frame of the lost frame, obtaining the MDCT coefficient corresponding to the lost frame, and synthesizing the recovered core decoding data and the MDCT coefficient obtained through the predicting to obtain the recovery frame corresponding to the lost frame. The invention further discloses a device and a system of the lost packet compensation based on the frequency domain. The proposal of the invention can provide higher continuity in the sound decoding frequency domain and better smoothness of sound signals, and improves the subjective quality.

The present invention relates to method and apparatus for improving video quality. The present invention provides a unified loop filter including: a pixel determining unit which determines the type of a pixel based on boundary strength; a similarity transforming unit which transforms a nonlinear filter into a nonlinear similarity-ordered statistics filter; and an integrating unit which integrates the nonlinear similarity-ordered statistics filter with a linear image filtering portion. The unified loop filter is applicable to filter reconstructed frames when an encoder or a decoder is processing a video signal.

The embodiment of the invention discloses a processing method and a processing device of a macro-block level quantizing parameter. The processing method of the macro-block level quantizing parameter comprises the steps that the direct residual value of the macro block is computed; the type of the macro block can be judged according to the direct residual value of the macro value and the position of the macro block in the image; and the value of the quantizing parameter used for the macro block can be computed and encoded according to the type of the macro block. The processing device of the macro-block level quantizing parameter comprises a first computation module used for computing the direct residual value of the macro block, a judging module used for judging the type of the macro block; and a second computation module used for computing and encoding the value of the quantizing parameter used for the macro block. The embodiment of the invention realizes the purposes that the more code rates can be distributed to the macro block of the interested area and the fewer code rates can be distributed to the macro block of the insensitive area and enhances the subjective quality of the video image.

A system (100) of processing audio data, comprising a decoding unit (102) and a determining unit (102, 106) having first determining means (102) and second determining means (106). The decoding unit (102) is adapted to decode encoded audio data to generate decoded audio data. The first determining means (102) is adapted to determine properties of the decoded audio data and/or of reproduction conditions under which the decoded audio data is to be reproduced, and the second determining means (106) is adapted to determine an amount of reverberation and/or of cross-talk to be added to the decoded audio data based on the determined properties of the decoded audio data and/or of the determined reproduction conditions under which the decoded audio data is to be reproduced.

The present invention relates to a video coder for predictive coding a video stream of subsequent frames according to motion compensation into an encoded video bit stream, comprising a frame buffer (207) configured to store at least one reference frame of the video stream, a prediction unit (210) configured to generate a prediction block of a current block of a current frame from a reference blockof the reference frame according to a motion vector having fractional-pel resolution, said fractional-pel resolution defining an integer-pel position and fractional-pel positions. The prediction unit(210) is configured to interpolate the reference block according to the fractional-pel resolution via one of the at least three following interpolation filters: a blurring interpolation filter (302),a tap filter (303), and the tap filter (303) followed by a sharpening filter (311).