آشکارسازی نواحی سایه در تصاویر هوایی شهری با استفاده از نقشه ‌نسبت بهینه

شناسنامه علمی شماره

نویسندگان

1 دانشکده فنی مهندسی - دانشگاه دامغان

2 دانشکده فنی مهندسی - دانشگاه شاهد

چکیده

در پردازش تصویر الگوریتم‌های زیادی به خاطر وجود سایه دچار اختلال می‌شوند. درصورتی‌که محل سایه‌ها مشخص باشد می‌توان از بروز خطا در این الگوریتم‌ها جلوگیری کرد. در این مقاله روشی بهینه برای آشکارسازی سایه در تصاویر هوایی ارائه شده است. در این پژوهش دو فضای رنگی RGB و YCbCr با هم ترکیب شده و نقشه نسبتی مناسب‌تر از نقشه نسبت‌های مشابه به وجود آمده است. علاوه بر این در اقدامی جدید، تأثیر رنگ آبی آسمان در هنگام ایجاد سایه در نقشه نسبت ارائه‌شده، در نظر گرفته شده است که این امر خود باعث افزایش میزان تفکیک‌پذیری نقشه نسبت شده است. در روش پیشنهادی از الگوریتم آستانه گذاری آتسو جهت تفکیک به دو ناحیه سایه و غیر سایه استفاده شده است. استفاده از این روش منجر به آستانه گذاری کلی شده و نیازی به بررسی محلی و ناحیه به ناحیه تصویر وجود ندارد. این امر باعث کاهش چشمگیر بار محاسباتی و امکان استفاده در کاربردهای بلادرنگ شده است. نتایج تجربی نشان می‌دهد روش ارائه‌شده نسبت به روش‌های مشابه کارایی بالاتری در آشکارسازی سایه و هزینه محاسباتی دارد.

کلیدواژه‌ها

عنوان مقاله [English]

Shadow Detection in Arial Image Using Optimized Ratio Map

نویسندگان [English]

  • J. Abbasi Aghamaleki 1
  • S. A. Miresmaili 2
1 Faculty of Engineering, University of Damghan, Damghan, Iran
2 Faculty of Engineering, Shahed University, Tehran, Iran
چکیده [English]

In image processing many algorithms get disturbed because of shadow. These problems can be avoided if the location of shadows is clear. This article presents a new optimized algorithm for extracting shadows from a single color aerial image. Most of similar works do this by using a suite color space. In this work two RGB and YCbCr color spaces are combined and a powerful ratio map has been created. Furthermore, in a new method, effect of sky blue color is determined that improves the ratio map. Candidate shadow and non-shadow regions are separated by applying Otsu’s thresholding method. Because of ratio map performance it is not necessary to analyze region by region and leads to decrease computation cost. So it can be used in online application. The experimental results demonstrate the advantage of the proposed algorithm.

کلیدواژه‌ها [English]

  • Shadow Detection
  • Color aerial image
  • Combined ratio map
  • RGB color space
  • YCbCr color space
  • Color attenuation relationship

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