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2657 results about "Video quality" patented technology

Video quality is a characteristic of a video passed through a video transmission/processing system, a formal or informal measure of perceived video degradation (typically, compared to the original video). Video processing systems may introduce some amount of distortion or artifacts in the video signal, which negatively impacts the user's perception of a system. For many stakeholders such as content providers, service providers, and network operators, the assurance of video quality is an important task.

Recording audio and video in a mobile communication terminal

The present invention relates to a microphone switching apparatus and method for a mobile communication terminal having a camcorder function, and in particular, a mobile communication terminal having a rotational camera so as to record more distinct and clearer sound, by disposing a microphone on the front and rear side of a mobile communication terminal and operating a microphone at a position corresponding to the direction of a subject (an object to be recorded) and a sound source. In a related art mobile communication terminal, a volume of voice / sound from a subject is recorded undesirably low when a subject is located in front direction of a mobile communication terminal and a camera is directed toward the subject, since it is recorded through the microphone located in the rear side of the terminal, wherein the microphone for voice communication is used for recording voice / sound when performing a camcorder function. To solve the aforementioned problems, a microphone switching apparatus and method for a mobile communication terminal has an effect to increase a volume and clearness of voice or sound which is recorded in video, and thereby to greatly improve the quality of video, which additionally disposes a front microphone on a front side of a mobile communication terminal so as to be used when performing a camcorder function, selects automatically or manually either of the front microphone or the rear microphone according to a derection of a camera, which the rear microphone is used for voice communication.
Owner:LG ELECTRONICS INC

Large-range fire disaster analyzing and early warning system

The invention provides a large-range fire disaster analyzing and early warning system which comprises a fire disaster characteristic database, a video capture module, a temperature collection module, a video quality improvement module, a fire disaster characteristic extraction module, a fire disaster characteristic identification module, a fire disaster management and control trigger rule judgment module and a fire disaster real-time management and control platform, wherein the fire disaster characteristic database comprises a smoke/flame image model; the video capture module is used for capturing digital video images within a large range; the temperature collection module is used for collecting temperature information through a thermal imaging product; the video quality improvement module is used for carrying out quality improvement on the video image; the fire disaster characteristic extraction module is used for carrying out foreground extraction, target matching and target classification on a video sequence; the fire disaster characteristic identification module is used for comparing and identifying a video object with the fire disaster characteristic database according to parameters set by a user; the fire disaster management and control trigger rule judgment module is used for judging whether a rule is broken or not according to the rule preset by the user by combining video characteristics and temperature values, and if so, sending out abnormal information; and the fire disaster real-time management and control platform is used for receiving a video analysis result and issuing a management and control order according to the analysis result.
Owner:BEIJING BOOSTIV TECH +1

Method and apparatus for video transmission over a heterogeneous network using progressive video coding

A video signal is encoded in a progressive video coder so as to generate a progressive coded video bit stream for transmission over a heterogeneous network. The progressive coded video bit stream is configured so as to be decodable at any one of a series of increasing bit rates up to a maximum bit rate, depending on which of a number of corresponding portions of the progressive coded video bit stream are received by a decoder. Each of the portions is associated with a different bit rate, and one or more of the portions may each also be associated with different values of other parameters such as frame rate, spatial resolution, and peak signal-to-noise ratio. Each of the series of increasing bit rates produces progressively better reconstructed video quality at an output of the decoder. The progressive coded bit stream is transmitted over a first part of the heterogeneous network at a first one of the bit rates. One or more selected portions of the progressive coded video bit stream are then transmitted from the first part of the heterogeneous network to a second part of the heterogeneous network. The selected portions are associated with a second one of the bit rates lower than the first bit rate, and may be selected based on an error detected in the transmission over the first part of the heterogeneous network, and/or a characteristic of the second part of the heterogeneous network. The invention provides efficient bit rate scalability and adaptability and is particularly well-suited for use in conjunction with transmission over heterogeneous wired-to-wireless networks.
Owner:AVAGO TECH INT SALES PTE LTD

Network video fault positioning system and method based on video detection and comprehensive network management

The invention relates to network video monitored fault positioning system and method based on video detection and comprehensive network management. In the invention, a fault positioning and analyzing center server generates quality detecting task information according to the set of users and equipment information obtained from a network video monitoring platform, and distributes the quality detecting task information to a video quality detecting server, and the video quality detecting server carries out detection according to video images obtained from the network video monitoring platform, realizes fault positioning by being combined with network information in the fault video flowing transmitting process in detection results, and displays corresponding fault positioning and warning information to the users. Therefore, when the network video quality has problems, by using the device and the method provided by the invention, the automatic fault poisoning can be realized, the fault warning can be prompted to the users, the maintenance reference suggestion can be provided, and further the stability of network video monitoring service can be ensured. The system provided by the invention is clear in framework, realizes reasonable cost, is easy and convenient for using the method and is wide in application range.
Owner:北京赛特斯信息科技股份有限公司

Shifting video code rate regulation method based on experience qualitative forecast

The invention relates to a shifting video code rate regulation method based on experience qualitative forecast. According to the invention, a sending end divides an encoding video speed rate into four grades, when a mobile terminal user requires a video business, the scale of the initial code rate of a video is middle, and thus, a QoE prediction model is periodically utilized to calculate a user taste value; the predicted QoE value and the presupposed QoE threshold value are compared, if the user experience quality is lower than the threshold value, and the corresponding adjustment is performed according to the network congestion indication and encoding video speed rate fedback by a receiving end in two periods; and the code rate grade of the next period is output until the request is finished, wherein the QoE prediction model is positioned on a video server side, and the decision tree structure is improved through training a plurality of gradients. The shifting video code rate regulation method provided by the invention can be used for solving a problem that in the current code rate regulation method, the video quality subjective feeling of users can not be considered, a network resource is fully utilized, meanwhile, the generation of network congestion is avoided or slacked, and the taste quality of the users is effectively improved.
Owner:ZHEJIANG UNIV
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