基于集成活动轮廓模型的SAR图像分割方法

图像分割是合成孔径雷达(Synthetic Aperture Radar, SAR)图像自动解译技术中的一个重要问题。基于活动轮廓的思想,给出了一种适应于SAR图像分割的集成活动轮廓模型。该模型综合利用SAR图像的边缘和区域特性,通过检测算子提取SAR图像的边缘信息,利用似然函数的最大化提取图像中不同统计信息的区域;通过边缘和区域的共同曲线运动实现对SAR图像的分割。利用加性算子分裂算法,给出了该模型的快速实现方法。通过MSTAR和实测星载SAR数据进行试验验证,并与其他算法比较,结果表明：所提方法适应性强,可适应复杂背景的SAR图像分割,并且分割定位准确、收敛速度较快;所提实现算法稳健,能适应不同参数设置,且对初始条件不敏感。〖JP〗     

Alexandre Ananoff (1910–1992): 30 years to promote astronautics before Sputnik

2012 marks the 20th anniversary of Alexandre Ananoff's death. Born in 1910 in Tbilisi, Georgia, the Russian–French space expert and enthusiast Alexandre Ananoff is known for being the organiser of the first International Astronautical Congress at La Sorbonne University, Paris, in September–October 1950, as well as being the author of the famous book L’Astronautique (1950) and for advising fellow author Hergé for his book adventures of Tintin on the Moon. The purpose of our paper is to present his complete works promoting space, from his first public presentations after discovering the works of Tsiolkovsky in the late 20s to his analysis of the first Sputnik launch in the popular French magazine Paris Match in 1957.A. Ananoff was a real ambassador for astronautics and a pioneer in space education for the general public—probably the first one in France. He built a unique collection of books and novels about space travel (donated before his death to the French Air and Space Museum of Paris-Le Bourget), wrote dozens of articles, gave numerous lectures and corresponded with most of the space pioneers around the world. However, he was criticised for being an autodidact and was very disappointed by the lack of consideration accorded him within his own country. During the 60s, he progressively stopped his space activities to turn his attention to becoming a specialist of 18th century French painters. He published his Memoirs of an Astronaut in 1978 and gave his last lecture at IAC in September 1979. He died in Paris on 25 December 1992, aged 82. His last wish was that his ashes could be sent on the Moon, an end accomplishment for all his efforts.