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35 results about "Video quality degradation" patented technology

Method for real-time identification and diagnosis of video network problems for digital cable and IPTV service providers

A method for identifying video network problems for digital cable and IPTV (Internet Protocol Television) service providers based on real-time on-line video quality monitoring by customers. A video quality problem reporting button is provided on each customer's set-top box and / or on a remote control unit therefor, which is used by the customer to report a video quality degradation problem to the service provider. Based on an aggregation of video quality problem reports by a plurality of customers, and based on geographical and topological information regarding these customers in connection with knowledge of the network topology, a network management system of the service provider advantageously identifies, locates, and potentially diagnoses a network problem.
Owner:LUCENT TECH INC

Method and apparatus for performing real-time on-line video quality monitoring for digital cable and IPTV services

A method and apparatus for performing real-time on-line video quality monitoring for digital cable and IPTV (Internet Protocol Television) services, wherein a problem reporting button is advantageously provided on a (video service provider's) customer's set-top box and / or on a remote control unit therefor. Such a button may be advantageously used by the customer to report a video quality degradation problem to service providers. Illustratively, a single push of this button initiates the reporting process to report the existence of a problem regarding video quality which the customer is experiencing. The customer may indicate the severity of the problem with use of the button, and may also respond interactively to questions and or suggestions presented by the service provider on the video screen. Such an interactive troubleshooting procedure may be implemented as software on the set-top box.
Owner:LUCENT TECH INC

Video Quality Estimation Apparatus, Method, and Program

In estimating subjective video quality corresponding to main parameters (21) which are input as an input frame rate (21A) representing the number of frames per unit time, an input coding bit rate (21B) representing the number of coding bits per unit time, and an input packet loss rate (21C) representing a packet loss occurrence probability of an audiovisual medium, a degradation model specifying unit (12) specifies a degradation model (22) representing the relationship between the packet loss rate and the degradation in reference subjective video quality (23) on the basis of the input frame rate (21A) and input coding bit rate (21B). A desired subjective video quality estimation value (24) is calculated by correcting the reference subjective video quality on the basis of a video quality degradation ratio corresponding to the input packet loss rate (21C) calculated by using the degradation model (22).
Owner:NIPPON TELEGRAPH & TELEPHONE CORP

Multipoint control unit clustering system and method

The invention discloses a multipoint control unit clustering system and method. The system comprises a media control server (MCS) and media processing servers (MPS), wherein the MCS receives conference information which is sent by a conference management server and allocates one or more MPSs to a conference according to a load balancing principle. The MCS multicasts or unicasts received media code stream of a terminal to all MPSs for providing the media processing service for the conference; each MPS is respectively responsible for a part of media processing work of the terminal for carrying out sound mixing or multi-image synthesis, the encoded media stream is sent to the MCS and is forwarded to the corresponding terminal through the MCS. When the MCS discovers that one MPS is dropped or one MPS needs maintenance, the MCS stores call information of the responsible MPSs into a to-be-processed linked list, the calls are transferred to other available MPSs one by one, and the terminal call still keeps a connection state. The multipoint control unit clustering system and method can solve the problems of delay of the media stream and drop of audio and video quality due to MCU cascading, and have the advantages of simple control logic, high reliability and failure recovery.
Owner:武汉随锐亿山科技有限公司

Method for hiding HEVC video information

ActiveCN104159117AGuarantee subjective and objective qualityReduce the impact of quality degradationDigital video signal modificationVideo bitstreamObjective quality
The invention provides a method for hiding HEVC (High Efficiency Video Coding) video information. The method comprises two steps of secret information embedding and secret information extracting; during secret information embedding, a prediction model is modulated in an intra-frame prediction coding process aiming at 4*4 prediction units by analyzing an HEVC coding and decoding structure, an intra-frame coding mode is selected in a self-adapting manner by using a Lagrangian rate-distortion model to decide whether to embed secret information; a corresponding relation between two bits of information to be embedded and angle difference intervals of the prediction model, completed information embedding of the prediction model is corrected according to the two bits of information to be embedded, a prediction model of only one prediction unit in the two continuous 4*4 prediction units in most cases is required to be corrected, so that correction bits is reduced under the same hiding capacity, and influence on the video quality, which is caused by the embedded secret information is reduced; objective and subjective video quality can be well ensured, and influence on a video bitstream, which is caused by the embedded secret information is greatly reduced.
Owner:NINGBO UNIV

Video cropping device based on frame coordinate, method and mobile terminal

The present invention discloses a video cropping device based on a frame coordinate, a method and a mobile terminal, belonging to the technical field of communication. The device comprises a coordinate information reading module for reading the coordinate information of a shot body in each frame of a video, a cropping area selection module for selecting a cropping area and automatically obtains the proportion of the shot body in a cropping area according to the coordinate information, and a cropping module for determining a final cropping area according to the proportion and cropping the video according to the final cropping area. According to the video cropping device, the method and the mobile terminal, the proportion of the shot body in the cropping area is automatically calculated in cropping the video, according to the size of the cropping area, the smallest influence on video content after cropping the video is ensured to the maximum, and the video quality decrease caused by shot body information loss in the cropping process is avoided.
Owner:NUBIA TECHNOLOGY CO LTD

OMA DRM stream media rights management system based on multilayer encryption system

InactiveCN101567782AEnhanced content securityImprove inspection functionSecuring communicationDigital rights management systemRights management
The invention relates to a mobile digital rights management system of a unicast stream media service, which adopts a multilayer encryption mechanism and video watermarking technology based on compatible OMA DRM 2.0 standard so as to enhance the content security of the mobile stream media service. Watermark embedding at a server end, encryption and PDCF packaging of media data and reverse processing of a client are the core content of the invention. The system has the advantages that: 1) the system adopts a two-layer time-varying content encryption mechanism and improves the security of content transmission; 2) the system is compatible with the OMA DRM 2.0 standard, is suitable for a mobile terminal and has low-cost proposal implementation; 3) the system adopts the watermarking technology to carry a digital summary of secondarily-encrypted content keys in original video data and supports the transmission integrity and accuracy verification of effective secondarily-encrypted keys or media data; and 4) the system embeds a removable watermark sequence into a susceptible and variable high-frequency I frame luminance component VLC domain, has low operation complexity of watermark embedding, extraction and removal, and eliminates video quality reduction possibly caused by the watermark embedding.
Owner:泛联智城(北京)国际科技有限公司

Hamming code plus one-based information hiding method of HEVC video

ActiveCN104902281AGuarantee subjective and objective qualityReduce the impact of quality degradationDigital video signal modificationHamming codeVideo bitstream
The invention discloses a hamming code plus one-based information hiding method of an HEVC video. The method comprises the steps as follows: using a (1, 3,2 ) matrix encoding algorithm in steganography code to combine with an LSBMR algorithm to form a hamming code plus one algorithm, modifying a prediction mode according to three-bit secret information to be embedded to finish information embedding, embedding the three-bit secret information in four continuous 4X4 intra-frame luminance blocks. The hamming code plus one-based information hiding method of the invention not only ensures hiding capacity, but also reduces the impact that the video quality is reduced because of modifying the prediction mode to ensure the subjective and objective quality of the video well, and greatly reduces the impact of embedded secret information to a video bitstream. By analyzing an HEVC coding and decoding structure, modulating the predication node in an intra-frame prediction coding process as the predication node which meets an embedding condition and whose rate-distortion cost is the smallest in terms of a predication unit whose size is 4 plus 4, and using a Lagrange rate-distortion mode to adaptively select the type of the prediction unit of the coding unit, the secret information hiding manner could well ensure the subjective and objective quality of the video.
Owner:NINGBO UNIV

Switching method capable of guaranteeing broadcast safety through quality supervision comparison

The invention provides a switching method capable of guaranteeing broadcast safety through quality supervision comparison. Video and audio quality supervision comparison is carried out on video and audio main input signals and video and audio spare input signals in a broadcast system, switching is carried out according to a comparison result so as to ensure broadcast safety. Meanwhile, black field and static-frame analysis also is carried out on the video to assist in judging effectiveness of the video. The method is applied to a one-main-one-spare broadcast system and a one-main-two-spare broadcast system, wherein the one-main-one-spare broadcast system and the one-main-two-spare broadcast system are commonly used. According to the method, the phenomena of video black field and static-frame alarming and video quality degradation are comprehensively considered, the broadcast system is ensured to be accurate and errorless in emergency switching, video broadcast effect is good and video broadcast quality is high.
Owner:SHANGHAI BAIBEI SCI & TECH DEV

Partial reconstruction-based quality optimization method for scalable video coding

The invention discloses a partial reconstruction-based quality optimization method for scalable video coding. The method comprises the following steps of: setting a truncation degree and a layer weight; performing partial reconstruction or entropy coding on a residual error conversion coefficient; calculating macro block distortion of a base layer and an enhancement layer; selecting an optimal mode for determining base layer macro blocks; traversing all macro blocks in a coding frame on the base layer so as to obtain the code stream of the base layer; selecting an optimal mode for determining enhancement layer macro blocks; traversing all macro blocks in a coding frame on the enhancement layer so as to obtain the code stream of the enhancement layer; and calculating and storing error diffusion distortion and error diffusion sensitivity. In the method, the residual error conversion coefficient is selectively truncated in a coding process, so that combined optimization of video quality at different target code rates is realized, and the problem of video quality reduction caused by the conventional code stream extraction method is solved; and simultaneously, an improved code stream extraction algorithm is used in a combined way, so that video quality is further enhanced.
Owner:ZHEJIANG UNIV

Method and device for transmitting media stream

Method and device for transmitting media stream are provided to solve the problem of quality reduction in audio and video caused by packet loss, jitter, link breakage in a media stream transmission process in the conventional art. The method includes: a media capability negotiation between a calling terminal and a called terminal is conducted according to a link establishment request message transmitted by the calling terminal and a response message transmitted by the called terminal in response to the link establishment request message, and at least two media channels are established; a media stream is transmitted through a first media channel according to negotiated media capabilities; and when an abnormity is detected to appear in the media stream transmission of the first media channel, another one of the at least two media channels is selected as a second media channel, and the media stream is switched from the first media channel to the second media channel for transmission. By the invention, the quality of audio and video of two communicating parties can be ensured.
Owner:ZTE CORP

OMA DRM mobile stream media rights management system facing multicast service

The invention relates to a mobile stream media digital rights management system facing a multicast service, which adopts a multilayer encryption mechanism, a video watermark authentication mechanism, a logic grouping mechanism and the like based on compatible OMA DRM 2.0 standard. A multicast user logic grouping mechanism at a server end and a system processing flow of a client joining multicast service stream are the key content of the invention. The system has the advantages that: 1) the system is compatible with OMA DRM 2.0 and provides a solution of content protection for wide application of a mobile multicast stream media service in a third generation mobile communication system; 2) the system provides a multicast receiver logic grouping strategy, reduces bandwidth consumption for transmitting a plurality of secondarily-encrypted content keys and provides support for concurrent users; 3) the system adopts MD5 summary algorithm and the video watermark authentication technology to provide the data integrity and the accuracy verification in the multicast transmission process; and 4) the system embeds a removable watermark sequence into motion vectors of original video data, has low complexity of watermark related operations, and eliminates video quality reduction possibly caused by watermark embedding.
Owner:泛联智城(北京)国际科技有限公司

Video deinterlacing method and device

The invention discloses a video deinterlacing method and device used for solving a problem of output video quality degradation due to indiscriminate deinterlacing treatment for different application scenes in the prior art. The video deinterlacing method includes reading video frames contained in an input video flow frame by frame and recognizing and reading static areas and roll title areas in the read video frames separately; performing deinterlacing treatment on the recognized static areas, the roll title areas and motion areas separately, wherein the motion areas include areas in the videoframes except the static areas and the roll title areas.
Owner:SUMAVISION TECH CO LTD

System and method for measuring video quality degradation using face detection

System and method to detect video quality degradation in a video stream received by a telecommunications endpoint, the method including: locating reference features characteristic of content in the received video stream; calculating reduced reference features from the located reference features; receiving reduced reference features of a transmitted video stream, the transmitted video stream corresponding to the received video stream; calculating a distance between the reduced reference features in the received video stream and the reduced reference features of the transmitted video stream; and detecting video quality degradation when the calculated distance exceeds a predetermined threshold.
Owner:AVAYA INC

Video coding method and device, video decoding method and device, electronic equipment and storage medium

The invention relates to the technical field of video processing, and discloses a video coding method and device, a video decoding method and device, electronic equipment and a storage medium, relates to the artificial intelligence technology, and aims to reduce the decoding complexity and improve the filtering efficiency under the condition that video quality is hardly influenced or the video quality is not obviously reduced by performing video filtering by using a machine learning technology in artificial intelligence. The method comprises the following steps: obtaining a reconstructed video frame from coded data of the video frame, wherein the video frame comprises at least two blocks; performing filtering processing on the reconstructed video frame, and obtaining gains obtained after filtering processing of each block in the reconstructed video frame; according to the gain distribution of each block, determining a block which needs to be filtered when the coded data is decoded from each block; and sending coded data of the video frame, wherein the coded data comprises indication information of the block needing to be filtered.
Owner:TENCENT TECH (SHENZHEN) CO LTD

MPEG-2 (Moving Pictures Experts Group-2) to H.264 fast video transcoding method

The invention discloses an MPEG-2 (Moving Pictures Experts Group-2) to H.264 fast video transcoding method, comprising the following steps of: firstly saving coding macro block modes of macro blocks in a P frame, coding block modes of the macro blocks and four 8*8 direct current coefficients in the macro blocks in MPEG-2 original video decoding process; secondly dividing all macro blocks in the P frame into five different types of macro blocks according to the saved coding macro types and the coding block modes; thirdly, only self-adaptively selecting the optimal coding mode from the coding modes having larger relativity with the performances of the macro blocks to code the macro blocks in the H.264 coding process. The method largely reduces the number of candidate coding modes for coding the macro blocks in the P frame in the premise of ensuring that the reduction of the video quality is a little and the increment of the code rate is not much, thereby effectively reducing the time complexity of macro code coding mode selection in the H.264 coding process, and reducing the MPEG-2 to H.264 video transcoding time, i.e. improving the MPEG-2 to H.264 video transcoding efficiency.
Owner:NINGBO UNIV

A video cutting device, method and mobile terminal based on frame coordinates

The present invention discloses a video cropping device based on a frame coordinate, a method and a mobile terminal, belonging to the technical field of communication. The device comprises a coordinate information reading module for reading the coordinate information of a shot body in each frame of a video, a cropping area selection module for selecting a cropping area and automatically obtains the proportion of the shot body in a cropping area according to the coordinate information, and a cropping module for determining a final cropping area according to the proportion and cropping the video according to the final cropping area. According to the video cropping device, the method and the mobile terminal, the proportion of the shot body in the cropping area is automatically calculated in cropping the video, according to the size of the cropping area, the smallest influence on video content after cropping the video is ensured to the maximum, and the video quality decrease caused by shot body information loss in the cropping process is avoided.
Owner:NUBIA TECHNOLOGY CO LTD

Partial reconstruction-based quality optimization method for scalable video coding

The invention discloses a partial reconstruction-based quality optimization method for scalable video coding. The method comprises the following steps of: setting a truncation degree and a layer weight; performing partial reconstruction or entropy coding on a residual error conversion coefficient; calculating macro block distortion of a base layer and an enhancement layer; selecting an optimal mode for determining base layer macro blocks; traversing all macro blocks in a coding frame on the base layer so as to obtain the code stream of the base layer; selecting an optimal mode for determiningenhancement layer macro blocks; traversing all macro blocks in a coding frame on the enhancement layer so as to obtain the code stream of the enhancement layer; and calculating and storing error diffusion distortion and error diffusion sensitivity. In the method, the residual error conversion coefficient is selectively truncated in a coding process, so that combined optimization of video quality at different target code rates is realized, and the problem of video quality reduction caused by the conventional code stream extraction method is solved; and simultaneously, an improved code stream extraction algorithm is used in a combined way, so that video quality is further enhanced.
Owner:ZHEJIANG UNIV

Compressed video quality enhancement method based on spatio-temporal information balance

The invention discloses a compressed video quality enhancement method based on spatio-temporal information balance, which is applied to the field of video processing and aims to solve the problem that the video quality is reduced in the existing compression technology. According to the method, a plug-and-play spatio-temporal information balance module is adopted, spatial features and time features are extracted, and the extracted time features and spatial features are aligned again in a feature space; noise and redundant time information introduced by alignment can be effectively removed; meanwhile, the space-time information proportion can be adaptively balanced, and the unified modeling problem of the PQF and the non-PQF is solved. And the effect of the existing video quality enhancement method can be obviously improved.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA

An information hiding method for HEVC video

ActiveCN104159117BGuarantee subjective and objective qualityReduce the impact of quality degradationDigital video signal modificationVideo bitstreamObjective quality
The invention provides a method for hiding HEVC (High Efficiency Video Coding) video information. The method comprises two steps of secret information embedding and secret information extracting; during secret information embedding, a prediction model is modulated in an intra-frame prediction coding process aiming at 4*4 prediction units by analyzing an HEVC coding and decoding structure, an intra-frame coding mode is selected in a self-adapting manner by using a Lagrangian rate-distortion model to decide whether to embed secret information; a corresponding relation between two bits of information to be embedded and angle difference intervals of the prediction model, completed information embedding of the prediction model is corrected according to the two bits of information to be embedded, a prediction model of only one prediction unit in the two continuous 4*4 prediction units in most cases is required to be corrected, so that correction bits is reduced under the same hiding capacity, and influence on the video quality, which is caused by the embedded secret information is reduced; objective and subjective video quality can be well ensured, and influence on a video bitstream, which is caused by the embedded secret information is greatly reduced.
Owner:NINGBO UNIV

An information hiding method for HEVC video based on Hamming code +1

ActiveCN104902281BGuarantee subjective and objective qualityReduce the impact of quality degradationDigital video signal modificationUnit sizeObjective quality
The invention discloses an information hiding method of HEVC video based on Hamming code+1, which utilizes the Hamming code+1 algorithm formed by combining the (1,3,2) matrix coding algorithm and the LSBMR algorithm in steganographic coding, according to the The embedded three-bit secret information modifies the prediction mode to complete the information embedding, and embeds three-bit secret information in four consecutive 4×4 intra-frame luminance blocks, which not only ensures the hidden capacity, but also reduces the risk of video quality degradation caused by the modification of the prediction mode. Influence, which well guarantees the subjective and objective quality of the video, and greatly reduces the impact of embedding hidden information on the video stream; by analyzing the HEVC codec structure, for the prediction unit with a size of 4×4, the intra-frame prediction coding process The medium modulation prediction mode is the prediction mode with the smallest rate-distortion cost that meets the embedding conditions, and uses the Lagrangian rate-distortion model to adaptively select the prediction unit type of the coding unit. This hidden information embedding method can well ensure that the video subjective and objective quality.
Owner:NINGBO UNIV
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