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Improving wavelet reconstruction algorithm to achieve comprehensive application of thermal infrared remote sensing data from TM and MODIS 被引量:1
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作者 周启刚 Chen Dan 《High Technology Letters》 EI CAS 2015年第2期224-230,共7页
According to the data characteristics of Landsat thematic mapper (TM) and MODIS, a new fu sion algorithm about thermal infrared data has been proposed in the article based on improving wave let reconstruction. Under... According to the data characteristics of Landsat thematic mapper (TM) and MODIS, a new fu sion algorithm about thermal infrared data has been proposed in the article based on improving wave let reconstruction. Under the domain of neighborhood wavelet reconstruction, data of TM and MO DIS are divided into three layers using wavelet decomposition. The texture information of TM data is retained by fusing highfrequency information. The neighborhood correction coefficient method (NC CM) is set up based on the search neighborhood of a certain size to fuse lowfrequency information. Thermal infrared value of MODIS data is reduced to the space value of TM data by applying NCCM. The data with high spectrum, high spatial and high temporal resolution, are obtained through the al gorithm in the paper. Verification results show that the texture information of TM data and high spec tral information of MODIS data could be preserved well by the fusion algorithm. This article could provide technical support for high precision and fast extraction of the surface environment parame ters. 展开更多
关键词 neighborhood wavelet reconstruction neighborhood correction coefficient method( NCCM) thematic mapper (TM) MODIS thermal infrared remote sensing image
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Point source detection performance of Hard X-ray Modulation Telescope imaging observation 被引量:1
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作者 Zhuo-Xi Huo Yi-Ming Li +1 位作者 Xiao-Bo Li Jian-Feng Zhou 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2015年第11期1905-1916,共12页
The Hard X-ray Modulation Telescope(HXMT) will perform an all-sky survey in the hard X-ray band as well as deep imaging of a series of small sky regions.We expect various compact objects to be detected in these imag... The Hard X-ray Modulation Telescope(HXMT) will perform an all-sky survey in the hard X-ray band as well as deep imaging of a series of small sky regions.We expect various compact objects to be detected in these imaging observations. Point source detection performance of HXMT imaging observation depends not only on the instrument but also on the data analysis method that is applied since images are reconstructed from HXMT observed data with numerical methods. The denoising technique used plays an important part in the HXMT imaging data analysis pipeline along with demodulation and source detection. In this paper we have implemented several methods for denoising HXMT data and evaluated the point source detection performances in terms of sensitivities and location accuracies. The results show that direct demodulation with 1-fold cross-correlation should be the default reconstruction and regularization method, although both sensitivity and location accuracy could be further improved by selecting and tuning numerical methods in data analysis used for HXMT imaging observations. 展开更多
关键词 regularization reconstructed selecting demodulation pixel wavelet pipeline neighborhood tuning histogram
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