35 results about "Video quality degradation" patented technology

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.

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.

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.

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.

The invention provides a photographing parameter setting method and a mobile terminal. The problem that the quality of camera photographing and videos is deteriorated, which is caused by conflicts generated by a camera working according to different control information of different controllers, is solved. The setting method provided by the invention comprises the steps that the scene feature information of a photographing scene is acquired when the camera acquires a preview image; different photographing parameters are set for each camera application according to the scene feature information; and the camera applications are applications which call the default components of the camera to realize default functions. According to the invention, the problem that conflicts are easily generated by the camera which works according to different control information sent by different controllers is avoided, and the effect of the image finally output by the camera is effectively improved.

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.

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.

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.

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.

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.

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.

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.

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.

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.