Abstract: Provided is a method generates an edge index of a current sample, and applies an edge offset corresponding to the edge index to the current sample. The edge index is generated using the differences between a current sample and two neighboring samples determined by an edge offset type. Accordingly, the difference between original samples and reconstructed samples are effectively reduced by generating the optimum edge index. Also, the quantity of bits required for reducing the differences are reduced by fixing the sign of offset to positive or negative.

Abstract: In one embodiment, a first set of digital data (e.g., an image) is tested for the presence of a certain feature (e.g., a certain face), yielding one of two outcomes (e.g., not-present, or present). If the testing yields the first outcome, no additional testing is performed. If, however, the testing yields the second outcome, further testing is performed to further check this outcome. Such further testing is performed on a second set of digital data that is based on, but different from, the first set of data. Only if the original testing and the further testing both yield the same second outcome is it treated as a valid result. A variety of other features and arrangements are also detailed.

Abstract: An audio and video communications apparatus eliminates a system clock frequency difference, freeing a user from unconformable feeling of audio and video. The audio and video communications apparatus includes: a transmitting unit and a receiving unit (106/108) transmitting and receiving audio and video via a network; a PTS correction timing determining unit (111) determining timing to update a correction amount of a PTS according to information of the audio or the video to be transmitted and received, the PTS being given to the received audio or the received video; a PTS correcting unit (112) correcting the PTS by updating the correction amount at the timing determined by the PTS correction timing determining unit (111); and an audio and video output unit (113) outputting the received audio and the received video corresponding to the corrected PTS found at a current time indicated by the audio and video communications apparatus.

Abstract: This invention provides a video quality estimation apparatus (1) including a packet analysis unit (10) that derives the bit rate of an encoded video packet contained in an input packet, and the bit amount of the encoded video packet for each encoded video frame type, a video subset frame characteristic estimation unit (11) that derives the frame characteristic of each video frame type from the bit rate derived by the packet analysis unit (10), and an encoding quality estimation unit (12) that derives, based on the bit rate and the bit amount of each video frame type, a video quality value quantitatively representing the quality of encoded video data that is affected by encoding degradation. The video quality estimation apparatus performs more accurate video quality estimation by taking account of the bit amount of each video frame type.

Abstract: An anomalous component within a processing system is identified. One or more transformed metrics of a processing system being monitored are analyzed, and an anomaly in the processing system is detected. Based on detecting the anomaly, at least one transformed metric is inversely transformed to obtain at least one suspect original metric. Using the at least one suspect original metric, the anomalous component is identified.

Abstract: According to a picture coding method, a coded picture is stored, as a reference picture, into a storage unit; commands indicating correspondence between reference pictures and reference indices for designating reference pictures and coefficients used for generation of predictive images are generated; a reference picture being used when motion compensation is performed on a current block in a current picture to be coded is designated by a reference index; a predictive image is generated by performing linear prediction on a block being obtained by motion estimation within the designated reference picture, by use of a coefficient corresponding to the reference index; a coded image signal including a coded signal obtained by coding a prediction error being a difference between the current block in the current picture to be coded and the predictive image, the commands, the reference index and the coefficient is outputted.

Abstract: Described herein is a system and method for audio visual synchronization. The picture are displayed by receiving an identifier, said identifier associated with a frame buffer storing a picture; extracting a presentation time stamp associated with the picture, wherein the picture is associated with a time stamp; comparing a local time clock value to the presentation time stamp; determining that the picture is mature for presentation if the presentation time stamp exceeds the local time clock value by less than a first predetermined threshold; and determining that the picture is mature for presentation if the local time clock value exceeds the presentation time stamp by less than a second predetermined threshold.

Abstract: A method, a system, and an apparatus for evaluating video quality are disclosed to improve accuracy of the evaluation. The method includes: obtaining information about a transmitted video; resolving the information about the transmitted video to obtain video frame parameters, where the video frame parameters include a compression distortion parameter and/or a video quality distortion parameter with packet loss; and calculating a video frame quality parameter according to the video frame parameters. An apparatus and a system for evaluating video quality are provided. The embodiments of the present invention improve accuracy of video quality evaluation without reference.

Abstract: In a data transmission system such as a television service provider system, compensation value data corresponding to information lost during lossy compression of program content (which may or may not already be compressed prior to the lossy compression) may be sent to a customer along with the lossy-compressed content. At the customer end, the compensation value data may be used during decompression to provide higher quality content to the customer than would otherwise be experienced without access to the compensation values.

Abstract: The present invention discloses a method for media file compression, which includes: extracting the encoding parameters from an input media file, separating and decoding the audio and video stream from the input media file, and extracting an original audio stream and an original video stream; computing the transcoding parameters required for compression according to the encoding parameters; encoding the original audio stream to output a new compressed audio stream, and encoding the original video stream to output a new compressed video stream according to the transcoding parameters; synthesizing the new compressed audio stream and the new compressed video stream to create a new media file. The present invention also provides a system for media file compression.

Abstract: A video encoder/decoder device, method, and computer program product combine to enhance entropy encoding by using different calculation approaches for assessing costs of using different encoding modes for a video encoding. Moreover, frames in a sequence, and/or sub-frames within a frame may have lowest cost coding modes selected using different cost calculation approaches. One exemplary cost calculation is SAD and another is SSD. A net effect is better subjective video quality for a given bitrate, with reduced encoder complexity, especially when recognizing the lesser amount of computational resources required to support SAD as opposed to SSD.

Abstract: Scalable codecs are used for transmitting channel zapping data for one or more programs using timeslicing. The main codec layer may be utilized also for the zapping data, and the higher layers may be used in the primary channels. Zapping data may be provided to mobile terminals via a wireless multicast network, such as a DVB-H network, using timeslicing and providing the scalably encoded zapping data as part of the source stream.

Abstract: A cross-layer encoder for providing UEP encoding of video data can be configured to provide UEP encoding of video data at an application layer of a transmission channel by receiving video packets having first and second priority levels, applying first and second coding schemes to video packets having first and second priority levels, respectively, and transmitting video frames having first and second priority levels. The cross-layer encoder can be configured to provide UEP encoding of video data at a physical layer of the transmission channel by receiving encoded video frames having first and second priority levels, applying third and fourth coding schemes to video frames having first and second priority levels, respectively, and transmitting cross-layer encoded video frames having first and second priority levels. The first through fourth coding schemes can generate different percentages of the total coding overhead based on first and second priority levels, respectively.

Abstract: 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 is selected then frequency information of the surroundings of the block boundary is obtained. A magnitude of a discontinuous component in a frequency domain belonging to the block boundary is adjusted based on a magnitude of a corresponding discontinuous component selected from a pixel contained entirely within a block adjacent the block boundary. The frequency domain adjustment is then applied to a spatial domain. Or, a DC offset mode can be selected to reduce blocking artifacts in smooth regions where there is little motion.

Abstract: Embodiments of the present invention provide a method and an apparatus for assessing video quality. The method includes: determining an actual quantization parameter and a critical quantization parameter of the target video according to a target video, where the critical quantization parameter is a maximum quantization parameter of the target video in a case in which a distortion is not evidently identifiable by human eyes; and determining quality of the target video according to the actual quantization parameter and the critical quantization parameter. According to the method and apparatus of the present invention, a critical quantization parameter of a target video is determined, and the actual quantization parameter is compared with the critical quantization parameter, which can accurately determine whether subjective quality of the target video changes strictly monotonically relative to the used actual quantization parameter, so that the video quality can be assessed accurately.

Abstract: An embodiment relates to performing error concealment of a corrupted block in a video frame, which is capable of performing a real time reconstruction of corrupted blocks which allow to precisely recover small details and fine movements, in particular, the error concealment apparatus and method according to an embodiment selects a replacement block by taking into account the luminance distortion and the motion characteristics of the video sequence. The latter is represented by the distance of the motion vectors chosen as candidate replacements and the average value of the motion vectors of the blocks surrounding the missing block in the current frame.

Abstract: The disclosure is directed to techniques for picture-in-picture (PIP) processing for video telephony (VT). According to the disclosed techniques, a local video communication device transmits PIP information to a remote video communication device. Using the PIP information, the remote video communication device applies preferential encoding to non-PIP regions of video transmitted to the local video communication device.

Abstract: In an image encoding device, a variable-length encoder encodes a quantized macro blocks and generates encoded data. The variable-length encoder forcefully encodes an end macro block of a line group composed of macro block lines, as a non-skipped macro block. Each of macro blocks which are to be encoded subsequent to the end macro block is encoded as a non-skipped macro block until an amount of codes of the encoded data including the end macro block reaches the smallest unit of transmission of the transmission part. As a result, the encoded data including the end macro block is transmitted to the image decoding device by the smallest unit of transmission.

Abstract: Provided is an image processing apparatus including a periodicity determining unit that determines whether a determination area including a target defective pixel is a periodicity area, a first pixel value generating unit that generates a pixel value by a first supplementing method, a second pixel value generating unit that generates a pixel value by a pixel second supplementing method, a control unit that determines which of the first pixel value generating unit and the second pixel value generating unit is to be used based on the determination by the periodicity determining unit, a pixel value supplementing unit that inserts the pixel value generated by the pixel value generating unit determined to be adopted, and a pixel value updating unit that updates pixel values of neighboring pixels of the defective pixel.

Abstract: A method and apparatus for measuring the quality of a video is provided. The method comprises: generating a frame loss pattern of the video by indicating whether each frame in the video is lost or successfully transmitted; and evaluating the quality of the video as a function of the generated t came loss pattern.

Abstract: A 3D decoding apparatus according to the present invention includes: a decoding unit which decodes left-eye and right-eye code signals to generate left-eye and right-eye decode signals; an error determining unit which determines an error of the left-eye and the right-eye code signals; an output determining unit which determines, when there is an error in one of the left-eye and the right-eye code signals, whether the one of the code signals that is determined as including an error has an error data mount equal to or greater than a first threshold; and an output unit which outputs neither the left-eye nor the right-eye code signal when the error data amount is smaller than the first threshold, and outputs only the decode signal obtained by decoding the other of the code signals when the error data amount is equal to or greater than the first threshold.

Abstract: Systems and methods for analyzing the performance of a digital network include capturing a stream of digital data, e.g., interne protocol (IP) packets, that represent streaming video, identifying which of the IP packets include bit errors, determining to which of a plurality of pixels the IP packets including bit errors belong and identifying such pixels as corrupted pixels, and illuminating only the corrupted pixels on a display of a tool. Corrupted pixels in different time blocks can be displayed with different colors to gain a better appreciation of the bit error rate over time.

Abstract: A digital broadcasting system and a data processing method are disclosed. A receiving system of the digital broadcasting system includes a receiving unit, an SI handler, and a decoding unit. The receiving unit receives broadcast signals including mobile service data and main service data. Herein, the mobile service data may configure a data group, and the data group may include a signaling information region in some of a plurality of data regions. Also, the signaling information region may include TPC signaling data and FIC signaling data. The SI handler acquires channel configuration information of the mobile service data from the broadcast signal using pre-decided IP access information, and extracts encoding format information for each IP stream component within a corresponding virtual channel service RTP-packetized and received from the acquired channel configuration information.

Abstract: A transmission apparatus receives information used to identify video data in which an error occurs on a communication path, and changes a coding mode in which data coding is performed by referring to video data in other frame so that video data coded by referring to the video data corresponding to the identification information is coded in a coding mode in which data coding is performed without referring to the video data in the other frame. Further, the transmission apparatus codes video data in the changed coding mode.

Abstract: A transmitting system, a receiving system, and a method of processing broadcast signals are disclosed. The method for processing a broadcast signal in a broadcast receiver comprises receiving a DTV signal including a data group, the data group including mobile service data, segmented known data sequences, long known data sequences and transmission parameter data, compensating carrier frequency offset of the DTV signal and channel-equalizing the carrier frequency offset compensated DTV signal using at least one of the long known data sequences and segmented known data sequences in the data group of the DTV signal, wherein the channel-equalizing includes performing a Error Correction (FEC) decoding on data located between the segmented known data sequences, and estimating Channel Impulse Response (CIR) using the FEC decoded data as known data.

Abstract: In one embodiment, a method comprises receiving a primary stream of encoded frames and a separate stream of redundant frames. The method further comprises decoding and reconstructing in parallel the frames in the primary stream and the separate stream of redundant frames, on a real-time basis, in accordance with a specified common clock reference. The method further comprises, upon determining that a frame in the primary stream exhibits an error or impairment, determining a decoded redundant frame in the separate stream that corresponds to the impaired frame, and substituting at least a portion of the information in the decoded redundant frame for a corresponding decoded version of the impaired frame.

Abstract: A system for correcting non-uniformity in a video detector. In one embodiment, a system for correcting non-uniformity in a video detector having an array of sensors referred to as pixels stores compressed gain terms and compressed offset terms in a non-uniformity memory (105). These gain terms and offset terms are generated in a calibration procedure, and are calculated to correct for non-uniformity in the video detector. The gain terms and offset terms are decompressed by a decompression block (125) and used to correct raw video data generated by the detector, forming corrected video. The storage of the gain terms and correction terms in compressed form reduces both the memory capacity requirements and the data bus bandwidth required.

Abstract: An apparatus and method are provided for compensating a block error in an image frame. This may include a video codec decoder for decoding an inputted image frame, and outputting a decoded image frame. An error concealment block may detect an error-generated block in the decoded image frame and compensate the detected error block through a median filter, and output the compensated image frame.

Abstract: Regarding an apparatus capable of transmitting data using a high-rate transmission channel having narrow directivity and a low-rate transmission channel having wide directivity, data is not correctly sent in some cases because a communication path for the high-rate transmission channel is easily interrupted. In contrast, it is not possible to realize sending of high-quality data using the low-rate transmission channel. The same data is simultaneously transmitted using the high-rate transmission channel and the low-rate transmission channel. The data that has been received using the high-rate transmission channel or the data that has been received using the low-rate transmission channel is selected in accordance with a state of reception using the high-rate transmission channel.

Abstract: In general, the disclosure relates to encoding and decoding a block of video data associated with three-dimensional (3D) video. A video coding device determines whether a depth condition associated with the block of video data should be set to valid within a coded bitstream. When the depth condition should be set to valid, the video coding device sets the depth condition to valid and encodes the block of video data using at least one camera parameter. The video coding device then determines whether the depth condition is valid. When the depth condition is valid, the video coding device decodes the block of video data using at least one camera parameter.

Abstract: A digital broadcasting transmission and/or reception system having an improved reception performance and a signal-processing method thereof. A digital broadcasting transmitter comprises a TRS encoder for to TRS-encode a MPEG-2 transmission stream having null data for inserting a Known data and a TRS parity at predetermined positions, randomizer to input and randomize data stream from the TRS encoder, a null packet exchanger to replace the null data for inserting the Known data to the known data, and an encoder for encoding a data streams to which the Known data is inserted. Accordingly, the present invention detects the known data from a signal received from a reception side and uses the detected known data for synchronization and equalization and further uses the TRS parity for correcting error of the received signal, so that the digital broadcasting reception performance can be improved at poor multipath channels.

Abstract: Playback and distribution systems and methods for multimedia files are provided. The multimedia files are encoded with flags associated with the content data of the multimedia files. Through the use of the flags, playback of the content is enhanced without significantly increasing the file size of the multimedia file.

Abstract: A data processing apparatus, a data processing method, and a program that are configured to prevent (or lower) the increase in scale and cost of the apparatus. A read/write control portion executes read/write control in which slots subject to extraction of two or more slots in one frame that is a collection of two or more slots each of which is a unit of error correction coding are written to a ring buffer and the slots subject to extraction in one frame written to the ring buffer are read within the unit time. When slots subject to extraction are changed, an output portion executes output processing in which dummy data outputted from a dummy data output portion are outputted with a timing immediately before a change start frame that is a frame from which the change of slots subject to extraction is started and, slots subject to extraction read from the ring buffer are outputted for frames subsequent to the change start frame.

Abstract: A processing module encodes data into a plurality of sets of encoded data slices in accordance with first error coding dispersal storage function parameters optimized for data recovery speed and non-optimal for data recovery reliability. The processing module encodes priority data segments of the data in accordance with second error coding dispersal storage function parameters to produce a plurality of sets of priority encoded data slices optimized for data recovery reliability and non-optimal for data recovery speed. The module outputs the plurality of sets of encoded data slices and the plurality of sets of priority encoded data slices to a dispersed storage network memory for storage therein.

Abstract: A video decoding method according to an embodiment of the present invention may include determining a type of a filter to be applied to a first-layer picture which a second-layer picture as a decoding target refers to; determining a filtering target of the first-layer picture to which the filter is applied; filtering the filtering target based on the type of the filter; and adding the filtered first-layer picture to a second-layer reference picture list. Accordingly, the video decoding method and an apparatus using the same may reduce a prediction error in an upper layer and enhance encoding efficiency.

Abstract: A communications system where data blocks from a communications device are received at least in a serving site over a wireless interface. The serving site typically checks whether data blocks have been correctly received and sends acknowledgement information to the communications device accordingly. An assisting site may also receive the data blocks and send information indicating whether data blocks have been correctly received in the assisting site. In this case, the serving site may request erroneously received information from the assisting site. Alternatively, the assisting site may send information indicating erroneous reception of data blocks in response to noticing a data block sent by the communications device. As a further alternative, the assisting site may be synchronized with the data blocks sent by the communications device and send quality information relating to the wireless interface between the communications device and the assisting site to the serving site.

Abstract: A method and apparatus for decoding an image are provided. The method includes: decoding information representing that a first block of the image has been encoded in a first mode; and reconstructing the first block by setting pixel values of the first block to be identical with pixel values of a second block of the image that is adjacent to the first block and has been decoded prior to the first block, wherein the first mode is a mode for encoding information representing that the first block is identical or similar to the second block and has been encoded in the first mode, instead of encoding the pixel values of the first block.

Abstract: A moving image encoding device includes determining whether an orthogonal transformation coefficient to which orthogonal transformation processing has been executed is equal to or less than a threshold determined from a quantization step used for quantization processing, and first calculating an encoding error from a first coefficient determined to be the threshold or less among the orthogonal transformation coefficients and the number of second coefficients determined to be larger than the threshold, and estimating, from the number of the second coefficients, an information amount generated when variable length encoding processing is executed to the orthogonal transformation coefficient after execution of the quantization processing, and second calculating an encoding cost from the encoding error and the information amount.

Abstract: Embodiments include systems and methods that use video compression techniques when browsing web pages referencing static image data or video content. In non-limiting examples, this can include using modern video compression techniques when browsing web pages referencing compressed static image data to obtain increased efficiency in transmission and/or rendering of the static image data on a browser at a client device. In an embodiment, a system includes a browser that browses a received web page having a content identifier and an associated video compression data signature. The browser includes a decoder that decodes compressed video content associated with the content identifier in accordance with a type of video compression identified by the video compression data signature to obtain static image data.

Abstract: An error concealment method and apparatus for an audio signal and a decoding method and apparatus for an audio signal using the error concealment method and apparatus. The error concealment method includes selecting one of an error concealment in a frequency domain and an error concealment in a time domain as an error concealment scheme for a current frame based on a predetermined criteria when an error occurs in the current frame, selecting one of a repetition scheme and an interpolation scheme in the frequency domain as the error concealment scheme for the current frame based on a predetermined criteria when the error concealment in the frequency domain is selected, and concealing the error of the current frame using the selected scheme.

Abstract: Technologies for recovering from dropped frames in the real-time transmission of video over an IP network are provided. A video streaming module receives a notification from a receiving module that a data packet has been lost. The video streaming module determines, based on the type of video frame conveyed in the lost packet and the timing of the lost packet in relation to the sequence of video frames transmitted to the receiving module, whether or not a replacement video frame should be sent to the receiving module. If the video streaming module determines a replacement video frame is warranted, then the video streaming module instructs a video encoding module to generate a replacement video frame and then transmits the replacement video frame to the receiving module.

Abstract: There are provided an analysis unit that analyzes an input bit stream to output first intermediate data and analysis information, a conversion rule storage unit that stores a conversion rule, according to which an error-detected bit stream included in the analysis information output from the analysis unit or a bit stream including reference information to an image used for a method not supported by a decoding unit is converted into a bit stream decodable by the decoding unit, and a conversion unit that converts the analysis information into second intermediate data according to the conversion rule, as well as the decoding unit that decodes the first intermediate data and the second intermediate data output from the analysis unit and the conversion unit. Thus, even when the decoding unit does not cope with specific information included in the analysis information, the decoding unit is able to stably perform a decoding procedure.

Abstract: A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for transmitting broadcast signals comprises an encoder for encoding DP (Data Pipe) data corresponding to each of a plurality of DPs, a mapper for mapping the encoded DP data onto constellations, a time interleaver for time interleaving the mapped DP data at DP level, a frame builder for building at least one signal frame including the time interleaved DP data, a modulator for modulating data in the built at least one signal frame by an OFDM (Orthogonal Frequency Division Multiplex) scheme and a transmitter for transmitting the broadcast signals having the modulated data.

Abstract: Identifying lost data packets and at least two intra coded frames of a video stream can be useful in determining the quality value of the video stream. The intra coded frames having maintained image quality can be determined based on estimating whether an intra coded frame is associated with a lost data packet. This allows a distance to be estimated between each one of the lost data packets and a next respective, subsequent intra coded frame having a maintained image quanta. Based on the distances, a quality value for the video stream can be generated.

Abstract: This invention relates to technology to mitigate degradation and distortion of H.264 video transmission over wireless networks.

Abstract: Systems and methods that employ an application-assisted approach to adaptive spatio-temporal error concealment in video decoders. The systems and methods employ a video receiver that can receive real-time video frames from a video transmitter over a wired and/or wireless network. The video receiver includes an end system configurable as an application for consuming the content of the real-time video frames. The end system application can determine whether each received real-time video frame is complete or incomplete, whether each received slice is complete or incomplete, and provide such information to the video decoder for use in avoiding errors while decoding the respective real-time video frames.

Abstract: A method of determining bit rates for use in encoding video data for joint decoding, is disclosed. An approximation of the video data is generated for later use as side information during a process of joint decoding. Bit error probabilities are determined for each bit plane and for each coefficient band of the approximation. The bit rates are determined for encoding the bit planes depending on the bit error probabilities, bit planes, and coefficient bands.

Abstract: Methods and systems for content-aware mapping/error protection are disclosed. Aspects of one method may include controlling a MAC layer and/or a PHY layer (PHY/MAC layer), in a wireless communication device to wirelessly communicate multimedia information based on content of the multimedia information, which may comprise video information, audio information, and/or data. The controlling of the PHY/MAC layer may comprise selecting a forward error correction code and modulation to be applied to portions of the multimedia information, and selecting one or more antenna to transmit the portions of the multimedia information. The selection criteria may be based on priority assigned to the portions of the multimedia information, and on feedback information from the receiving device and/or a receiver co-located with the device transmitting the multimedia information.

Abstract: A method, a system, and an apparatus for evaluating video quality are disclosed to improve accuracy of the evaluation. The method includes: obtaining information about a transmitted video; resolving the information about the transmitted video to obtain video frame parameters, where the video frame parameters include a compression distortion parameter and/or a video quality distortion parameter with packet loss; and calculating a video frame quality parameter according to the video frame parameters. An apparatus and a system for evaluating video quality are provided. The embodiments of the present invention improve accuracy of video quality evaluation without reference.

Abstract: A video stream transmission method is provided. The method has the following steps of: utilizing a video encoding apparatus to encode a plurality of first images to generate a video bitstream and transmit the video bitstream to the video decoding apparatus over a network; utilizing a video decoding apparatus to decode the video bitstream to generate a plurality of second images correspondingly; and when the video decoding apparatus detects that there is data loss of the video bitstream during transmission, utilizing the video decoding apparatus to reference a third image, which is the most recent completely decoded image of the plurality of second images, to perform subsequent video decoding processes and transmit a request signal to the video encoding apparatus, so that the video encoding apparatus references a fourth image, which corresponds to the third image, of the plurality of first images, to perform subsequent video encoding processes.