With the rapid development of computer network

social media

digital television and communications technology

generating

processing and access to multimedia data has become more convenient. Multimedia applications are increasingly widespread

and the amounts of multimedia data are showing the explosive growth. In the era of big data

multimedia data has become a major data objects. However

due to its unstructured nature of multimedia data

the processing and retrieval of multimedia data is relatively difficult. How to effectively store

organization and management of these data

how to access and retrieve data in accordance with the multimedia content and features

has become an urgent need. This report is organized around video event detection and annotation

high-dimensional index structure and cross-media search three research directions

and elaborates their development status in 2012 and future development trend outlook.