Multi-level annotation of natural scenes using dominant image components and semantic concepts
Proceedings of the 12th annual ACM international conference on Multimedia
IEEE Transactions on Pattern Analysis and Machine Intelligence
Proceedings of the 6th ACM international conference on Image and video retrieval
Saturation enhancement of blue sky for increasing preference of natural scenes
SIP '07 Proceedings of the Ninth IASTED International Conference on Signal and Image Processing
Statistical modeling and conceptualization of natural images
Pattern Recognition
Ontology-supported video modeling and retrieval
AMR'06 Proceedings of the 4th international conference on Adaptive multimedia retrieval: user, context, and feedback
Morphological segmentation of building façade images
ICIP'09 Proceedings of the 16th IEEE international conference on Image processing
Horizon Profile Detection for Attitude Determination
Journal of Intelligent and Robotic Systems
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Sky is among the most important subject matter frequently seen in photographic images. We propose a model-based approach consisting of color classification, region extraction, and physics-motivated sky signature validation. First, the color classification is performed by a multilayer backpropagation neural network trained in a bootstrapping fashion to generate a belief map of sky color. Next, the region extraction algorithm automatically determines an appropriate threshold for the sky color belief map and extracts connected components. Finally, the sky signature validation algorithm determines the orientation of a candidate sky region, classifies one-dimensional (1-D) traces within the region based on a physics-motivated model, and computes the sky belief of the region by the percentage of traces that fit the physics-based sky trace model. A small-scale, yet rigorous test has been conducted to evaluate the algorithm performance. With approximately half of the images containing blue sky regions, the detection rate is 96% with a false positive rate of 2% on a per image basis