آشکارسازی رخداد آتش به‌کمک تصاویر ویدئویی در محیط‌‌‌های سرباز شهری

سامانه‌های تشخیص حریق با توجه به قابلیت گسترش سریع و توانایی بالای آتش در تخریب، از اهمیت بالایی برخوردار هستند. روش‌های سنتی شناسایی آتش که بر مبنای اثرات ناشی از آتش مانند دود و حرارت هستند، در محیط‌های بزرگ و سرباز کارایی لازم را ندارند. هدف از این مقاله ارائه‌ روشی کارآمد برای تشخیص آتش به‌کمک تصاویر ویدئویی در محیط‌های سرباز شهری با تمرکز بر انبار شرکت گاز با هزینه محاسباتی پایین است. در روش پیشنهادی از مولفه رنگ و ویژگی‌های زمانی و مکانی که خاصیت تفکیک‌کنندگی بالایی دارند، استفاده شده است. ابتدا نواحی نامزد آتش با کمک مدل رنگی انتخاب و ﺳﭙﺲ ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﺗﻐﯿﯿﺮات ﻧﺎﻣﻨﻈﻢ ﭘﯿﻮﺳﺘﻪ ﺷﻌﻠﻪ آﺗﺶ در قاب‌های متوالی و ﭘﺮاﮐﻨﺪﮔﯽ ﺳﻄﻮح روﺷﻨﺎیﯽ ﮐﺎﻧﺎل ﻗﺮﻣﺰ، ﻧﻮاﺣﯽ آﺗﺶ در ﺗﺼﺎویﺮ اﺳﺘﺨﺮاج می شوند. آزمایش‌های انجام‌شده حاکی از آن است که روش پیشنهادی علاوه‌بر این‌که در نمونه ویدئوهای بررسی‌شده، قابلیت تشخیص صد‌درصدی وقوع آتش را در محیط‌های سرباز شهری دارد، زمان تشخیص را در شرایط مشابه نسبت به روش مقاله پایه 87.35 درصد کاهش داده است.

Fire detection using video sequences in urban out-door environment

Nowadays automated early warning systems are essential in human life. One of these systems is fire detection which plays an important role in surveillance and security systems because the fire can spread quickly and cause great damage to an area. Traditional fire detection methods usually are based on smoke and temperature detectors (sensors). These methods cannot work properly in large space and outdoor environments. They have high false alarm rates, and to cover the entire area, many smoke or temperature fire detectors are required, that is expensive. Due to the rapid developments in CCTV (Closed Circuit Television) surveillance system in recent years and video processing techniques, there is a big trend to replace conventional fire detection techniques with computer visionbased systems. This new technology can provide more reliable information and can be more costeffective. The main objective of fire detection systems is high detection accuracy, low error rate and reasonable time detect. The video fire detection technology uses CCD cameras to capture images of the observed scene, which provides abundant and intuitive information for fire detection using image processing algorithms. This paper presents an efficient fire detection system which detects fire areas by analyzing the videos that are acquired by surveillance cameras in urban outdoor environment, especially in storage of Yazd Gas Company.Proposed method uses color, spatial and temporal information that makes a good distinction between the fire and objects which are similar to the fire. The purpose is achieved using multi filter. The first filter separates red color area as a primary fire candidate. The second filter operates based on the difference between fire candidate areas in the sequence of frames. In the last filter, variation of red channel in the candidate area is computed and compared with the threshold which is updating continuously. In the experiments, the performance of these filters are evaluated separately. The proposed final system is a combination of all filters. Experimental results show that the precision of the final proposed system in urban outdoor environment is 100%, and our technique achieves the average detection rate of 87.35% which outperforms other base methods.