Aircraft Detection from VHR Images Based on Circle-Frequency Filter and Multilevel Features
Figure 2
Illustration of the aircraft regular patterns. (a) Bright aircraft (32 × 32 pixels); (b) regular pattern of the bright aircraft; (c) dark aircraft (32 × 32 pixels); (d) regular pattern of the dark aircraft. The intensities along the red circle will change regularly from darkness to brightness and will repeat four times.
