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Design of a high definition imaging ...

Laurent, Sophie Nathalie.

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Design of a high definition imaging (HDI) analysis technique adapted to challenging environments.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Design of a high definition imaging (HDI) analysis technique adapted to challenging environments./
作者:	Laurent, Sophie Nathalie.
面頁冊數:	263 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-12, Section: B, page: 6557.
Contained By:	Dissertation Abstracts International65-12B.
標題:	Engineering, Electronics and Electrical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3157388
ISBN:	9780496901371

Design of a high definition imaging (HDI) analysis technique adapted to challenging environments.
Laurent, Sophie Nathalie.

Design of a high definition imaging (HDI) analysis technique adapted to challenging environments. - 263 p.

Source: Dissertation Abstracts International, Volume: 65-12, Section: B, page: 6557.

Thesis (Ph.D.)--Boston University, 2005.

This dissertation describes a new comprehensive, flexible, highly-automated and computationally-robust approach for high definition imaging (HDI), a data acquisition technique for video-rate imaging through a turbulent atmosphere with telescopes not equipped with adaptive optics (AO). The HDI process, when applied to astronomical objects, involves the recording of a large number of images (103--105) from the Earth and, in post-processing mode, selection of the very best ones to create a "perfect-seeing" diffraction-limited image via a three-step process. First, image registration is performed to find the exact position of the object in each field, using a template similar in size and shape to the target. The next task is to select only higher-quality fields using a criterion based on a measure of the blur in a region of interest around that object. The images are then shifted and added together to create an effective time exposure under ideal observing conditions. The last step's objective is to remove residual distortions in the image caused by the atmosphere and the optical equipment, using a point spread function (PSF), and a technique called "l1 regularization" that has been adapted to this type of environment.

ISBN: 9780496901371Subjects--Topical Terms:

626636
Engineering, Electronics and Electrical.

Design of a high definition imaging (HDI) analysis technique adapted to challenging environments.
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520 $a This dissertation describes a new comprehensive, flexible, highly-automated and computationally-robust approach for high definition imaging (HDI), a data acquisition technique for video-rate imaging through a turbulent atmosphere with telescopes not equipped with adaptive optics (AO). The HDI process, when applied to astronomical objects, involves the recording of a large number of images (103--105) from the Earth and, in post-processing mode, selection of the very best ones to create a "perfect-seeing" diffraction-limited image via a three-step process. First, image registration is performed to find the exact position of the object in each field, using a template similar in size and shape to the target. The next task is to select only higher-quality fields using a criterion based on a measure of the blur in a region of interest around that object. The images are then shifted and added together to create an effective time exposure under ideal observing conditions. The last step's objective is to remove residual distortions in the image caused by the atmosphere and the optical equipment, using a point spread function (PSF), and a technique called "l1 regularization" that has been adapted to this type of environment.
520 $a In order to study the tenuous sodium atmospheres around solar system bodies, the three-step HDI procedure is done first in the white light domain (695--950 nm), where the Signal-to-Noise Ratio (SNR) of the images is high, resulting in an image with a sharp limb. Then the known selection and registration results are mapped to the simultaneously recorded spectral data (sodium lines: 589 and 589.6 nm), where the lower-SNR images cannot support independent registration and selection. Science results can then be derived from this spectral study to understand the structure of the atmospheres of moons and planets. This dissertation's contribution to space physics deals with locating the source of escaping sodium from Jupiter's moon lo. The results show, for the first time, that the source region is not homogeneously distributed around the small moon, but concentrated on its side of orbital motion. This identifies for modelers the physical mechanisms taking place around the most volcanic moon in the solar system.
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