IJE TRANSACTIONS A: Basics Vol. 27, No. 1 (January 2014) 91-100   

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S. V. Shojaedini and M. Heidari
( Received: June 10, 2013 – Accepted in Revised Form: September 14, 2013 )

Abstract    In this paper a new method is introduced for root detection in minirhizotron images for root investigation. In this method firstly a hypothesis testing framework is defined to separate roots from background and noise. Then the correct roots are extracted by using an entropy-based geometric level set decision function. Performance of the proposed method is evaluated on real captured images in two different scenarios. In the first scenario images contain several roots however the second scenario belongs to no-root images, which increases the chance of false detection error. The obtained results show the greater ability of the proposed method in root detection compared with present approaches in all examined images. Furthermore it can be shown that better detection of roots in proposed algorithm not only doesn't lead to extracting more false particles but also it decreases rate of false detections compared to existing algorithms.


Keywords    Root Detection, Minirhizotron Images, Hypothesis testing, Entropy, Geometric Level Set


چکیده    در این مقاله روشی جدید به منظور آشکارسازی ریشه های گیاهان در تصاویر اخذ شده توسط سیستم مینی رایزوترون ارایه می شود. در روش پیشنهادی به منظور تفکیک ریشه ها از پس زمینه و نویز موجود در تصاویر ابتدا مساله با استفاده از مفهوم آزمون فرضها بازتعریف می شود. در گام بعدی تابع تصمیمی که با استفاده از سطوح همتراز مبتنی بر آنتروپی تصاویر تعریف می شود، محاسبه می گردد. مقدار این تابع می تواند فرضیه صحیح را مشخص نموده و لذا ریشه را از پس زمینه و نویز تصاویر تفکیک نماید. عملکرد روش پیشنهادی با استفاده از تصاویر اخذ شده توسط سیستم مینی رایزوترون در دو سناریوی مختلف آزموده می شود. در اولین سناریو تصاویر مورد آزمون شامل ریشه هستند، در حالی که سناریوی دوم مربوط به تصاویری است که شامل هیچ ریشه ای نمی باشند. نتایج حاصل از مقایسه عملکرد روش پیشنهادی و چند روش موجود حاکی از برتری روش پیشنهادی این مقاله در استخراج ریشه های صحیح هستند. همچنین نتایج به دست آمده نشان می دهند که به موازات برتری مزبور، روش پیشنهادی این مقاله ریشه های نادرست کمتری را نیز نسبت به سایر روش های آزموده شده به دست می دهد.


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