Global Semantic Classi cation of Scenes using Power Spectrum Templates
نویسندگان
چکیده
Scene recognition and content-based procedures are of great interest for image indexing applications processing very large databases. Knowing the category to which a scene belongs, a retrieval system may lter out images belonging to other categories. In this paper, we introduce a computational approach which classi es and organises real-world scenes along broad semantic axes. Fundamental to our approach is the computation of global spectral templates providing a continuous organisation of scenes between two categories. These templates encode the structure which is discriminant between two categories. We propose a hierarchical procedure of two stages, that organises images along three semantic axis. Firstly, all the scenes are classi ed according to an Arti cial to Natural axis. Then, natural scenes are organised along the Open to Closed axis whereas arti cial environments are classi ed according to the Expanded to Enclosed scenes axis.
منابع مشابه
Classification of scene photographs from local orientations features
Natural image understanding is a very active and promising research domain both in psychology for visual perception modelling and in computer science for image retrieval. In this study, we investigate the eciency of orientation distributions over the whole image in the scale space. The global distribution of the local dominant orientations (LDO) appears to be a powerful feature for discriminat...
متن کاملDecision templates for multiple classi"er fusion: an experimental comparison
Multiple classi"er fusion may generate more accurate classi"cation than each of the constituent classi"ers. Fusion is often based on "xed combination rules like the product and average. Only under strict probabilistic conditions can these rules be justi"ed. We present here a simple rule for adapting the class combiner to the application. c decision templates (one per class) are estimated with t...
متن کاملGlobal land cover classi ® cations at 8 km spatial resolution : the use of training data derived from Landsat imagery in decision tree classi ® ers
This paper reports a study which aims to (i) develop methodologies for global land cover classi® cations that are objective, reproducible and feasible to implement as new satellite data become available in the future and (ii) provide a global land cover classi® cation product based on the National Aeronautics and Space Administration/National Oceanic and Atmospheric Administration Path® nder La...
متن کاملTexture Segmentation of SAR Sea Ice Imagery
Texture Discrimination of SAR Sea Ice Imagery The di erentiation of textures is a critical aspect of SAR sea ice image segmen tation Provision of images that identify pertinent ice types is important for the operational ice breakers ships oil platforms and scienti c ie global warming monitoring communities Although a human is readily able to visually segment any textured image no unsupervised m...
متن کاملDialog act classification with the help of prosody
This paper presents automatic methods for the segmentation and classi cation of dialog acts (DA). In Verbmobil it is often su cient to recognize the sequence of DAs occurring during a dialog between the two partners. Since a turn can consist of one or more successive DAs we conduct the classi cation of DAs in a two step procedure: First each turn has to be segmented into units which correspond ...
متن کامل