Airport Detection and Aircraft Recognition Based on Two-Layer Saliency Model in High Spatial Resolution Remote-Sensing Images

Efficient airport detection and aircraft recognition are essential due to the strategic importance of these regions and targets in economic and military construction. In this paper, a novel airport detection and aircraft recognition method that is based on the two-layer visual saliency analysis model and support vector machines (SVMs) is proposed for high-resolution broad-area remote-sensing images. In the first layer saliency (FLS) model, we introduce a spatial-frequency visual saliency analysis algorithm that is based on a CIE Lab color space to reduce the interference of backgrounds and efficiently detect well-defined airport regions in broad-area remote-sensing images. In the second layer saliency model, we propose a saliency analysis strategy that is based on an edge feature preserving wavelet transform and high-frequency wavelet coefficient reconstruction to complete the pre-extraction of aircraft candidates from airport regions that are detected by the FLS and crudely extract as many aircraft candidates as possible for additional classification in detected airport regions. Then, we utilize feature descriptors that are based on a dense SIFT and Hu moment to accurately describe these features of the aircraft candidates. Finally, these object features are inputted to the SVM, and the aircraft are recognized. The experimental results indicate that the proposed method not only reliably and effectively detects targets in high-resolution broad-area remote-sensing images but also produces more robust results in complex scenes.