Multimedia database

About: Multimedia database is a research topic. Over the lifetime, 1404 publications have been published within this topic receiving 19856 citations. The topic is also known as: Multimedia database & MMDB.

Method and device for retrieving multimedia data using shape information

Abstract: PROBLEM TO BE SOLVED: To make a complicated shape information detailedly expressible and to make exactly and speedily retrievable multimedia data by comparing the feature of an outputted question video with the feature of a video in a multimedia database and outputting the compared result. SOLUTION: At the time of multimedia data retrieval, a feature extracting part 11 for the question video receives the shape information of the question video and extracts the feature of the shape information while using a shape information describer to use the peculiar vectors of multilayer covariant matrix, a feature extracting part 22 for video for multimedia database construction extracts the feature of respective video data similarly to the feature extracting part 11 and a multimedia data constructing part 33 constructs a multimedia database from these features. Then, a similarity comparing part 45 calculates the degree of similarity by comparing the feature of the question video outputted from the respective feature extracting parts 11 and 22 with the feature of the video in the multimedia database and this calculated result is outputted by a compared result output part 55.

Method of managing multimedia data and mobile communication terminal

Abstract: A mobile communication terminal having a function of managing multimedia data is provided, including: a main memory including a multimedia database storing the multimedia data; a signal processor converting the multimedia data stored in the main memory into data of a format suitable to be output to a display of the mobile communication terminal; a back_end chip which processes the multimedia data outputted from the signal processor, stores digest information of multimedia data upon occurrence of an update event of the multimedia data, and provides the stored digest information upon receiving a signal of requesting the digest information to be synchronized; and a front_end chip including a controller which requests the digest information stored in the back_end chip, compares and synchronizes the digest information offered from the back_end chip and digest information stored in advance in the front_end chip.

The Storage System for a Multimedia Data Manager Kernel

Abstract: One way to boost the performance of a Database Management System (DBMS) is by fetching data in advance of their use, a technique known as prefetching. However, depending on the resource being used (file, disk partition, memory, etc.), the way prefetching is done might be different or even not necessary, forcing a DBMS to be aware of the underlying Storage System. In this paper we propose a Storage System that frees the DBMS of this task by exposing the database through a unique interface, no matter what kind of resource hosts it. We have implemented a file resource that recognizes and exploits sequential access patterns that emerge over time to prefetch adjacent blocks to the requested ones. Our approach is speculative because it considers past accesses, but it also considers hints from the upper layers of the DBMS, which must specify the access context in which a read operation takes place. The informed access context is then mapped to one of the available channels in the file resource, which is equipped with a set of internal buffers, one per channel, for the management of fetched and prefetched data. Prefetched data are moved to the main cache of the DBMS only if really requested by the application, which helps to avoid cache pollution. So, we slightly introduced a two level cache hierarchy without any intervention of the DBMS kernel. We ran the tests with different buffer settings and compared the results against the OBL policy, which showed that it is possible to get a read time up to two times faster in a highly concurrent environment without sacrificing the performance when the system is not under intensive workloads.

New methods of strong neighborhood pair query

Abstract: The strong neighborhood pair query has important significance in spatial database and multimedia database etc.The double Voronoi diagrams method that deal with the strong neighborhood pair query in the datasets without barriers is presented. Furthermore,according to the features of the blocking about the data points pairs with barriers,the filtration regions are proposed and the data points pairs are handled.Thus,the decision range and the redundant computation are decreased.Theoretical analysis and the experiment show that the method has a wide applicability and significantly increases the query efficiency of the strong neighborhood pair.

A multimedia streaming server and an Interconnection Method of multimedia streaming system and multimedia database

Abstract: PURPOSE: A server for supplying a multimedia streaming and a method for interlocking a streaming system and a multimedia database system in the device are provided to improve a reliability of a system by managing information of multimedia data and multimedia reproduction data in a database, thereby overcoming inconsistency between information data and multimedia reproduction data. CONSTITUTION: A streaming system(100) transmits multimedia data to a streaming client. A multimedia database system(200) transmits stored multimedia data to the streaming system(100). A shared memory(350) temporarily stores data for transmitting multimedia data in the multimedia database system(200) to the streaming system(100). A message queue(300) transmits and receives a message between the streaming system(100) and the multimedia database system(200). The message queue(300) exists in a stack which is a temporary storing memory in a streaming server. A transmission managing unit(130) packetizes media data in accordance with a protocol for transmitting multimedia data to the streaming client. A media managing unit(120) reads multimedia data from the shared memory(350), decodes the read multimedia data, and transmits the multimedia data to the transmission managing unit(130). If a streaming is requested from the streaming client, a database connector(110) creates a corresponding multimedia streaming session and transmits a task message to the multimedia database system(200). After terminating a streaming task, the database connector(110) deletes a streaming session. A database server(200) includes multimedia data and stores multimedia data requested from the streaming system(100) in the shared memory(350). A media client(210) interprets a message transmitted from the database connector(110) and requests that the database server(200) executes a corresponding task.