تاثیر جهت‌گیری ساختمان و هندسه دید در تصاویر SAR

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه صنعتی مالک اشتر

2 مالک اشتر

چکیده

تشخیص ساختمان با استفاده از تصاویر رادرای SAR با توجه به کاربرد گسترده آن بسیار مورد توجه است. اما پیچیدگی تصاویر SAR تشخیص اشیا را با چالش­های زیادی مواجه کرده است. یکی از عوامل تاثیرگذار بر شدت روشنایی تصاویر SAR هندسه دید است که باعث تغییر شکل ساختمان و حتی در برخی از موارد دیده نشدن ساختمان در تصاویر راداری می­شود. هندسه­دید شامل زاویه برخورد، زاویه دید، زاویه کجی و جهت تصویربرداری است که در منابع تحقیقاتی کمتر به آن پرداخته شده است. در این مقاله قصد داریم ساختمان­هایی که متأثر از تغییر پارامتر هندسه­دید هستند را استخراج کرده و علت تغییر آن را تحلیل و اثبات کنیم. به عبارت دیگر، با استفاده از آشکارسازی تصاویر با زاویه برخورد مختلف، جهت گیری ساختمان­هایی که متاثر از این تغییر است، شناسایی می­­شوند. بدین منظور از تصاویر سری زمانی ماهواره سنتینل۱ مربوط به منطقه باغستان تهران استفاده شده است. با استفاده از روش آشکارسازی تغییرات CMV2 نتایج نشان داده است که با تغییر ˚10 زاویه برخورد، سوله­های کارگاهی یا کارخانه­ای در جهت ˚20 نسبت به افق از تصویر راداری حذف خواهند شد.

کلیدواژه‌ها


عنوان مقاله [English]

The Impact of Building Orientation and Visibility Geometry in SAR Images

نویسندگان [English]

  • fateme amjadipour 1
  • hamid dehghani 2
1 malek ashtar university
2 Malek Ashtar University of Technology
چکیده [English]

The detection of buildings using SAR radar images is of great interest due to its widespread use. But the complexity of SAR images poses many challenges to object recognition. One of the factors affecting the brightness of SAR images is the geometry of the vision, which causes the deformation of the building and in some cases even the omission of the buildings in radar images. The geometry of view includes incident angle, look angle, squint angle and direction of imaging, which is less discussed in research sources. In this paper, we intend to extract the buildings that are affected by changing the geometric parameter and analyze and prove the reason for its change. In other words, by detecting images with different incident angles, the orientation of the buildings affected by this change is identified. For this purpose, the time series images of Sentinel 1 satellite related to Baghistan region of Tehran are used. Using the CMV2 change detection method, the results show that changing the angle of impact by 10 degrees, leads to the removal of the workshop or factory sheds lying in the direction of 20 degrees to the horizon from the radar image.

کلیدواژه‌ها [English]

  • SAR
  • Sentinel-1
  • Visibility Geometry
  • Incidence Angle
  • Change Detection
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