本文關(guān)鍵詞： CMOS攝像頭 核輻射探測(cè) 視頻處理 幀間差分　出處：《原子能科學(xué)技術(shù)》2017年01期 　論文類型：期刊論文

【摘要】：CMOS傳感器可與X/γ射線直接作用,因此存在利用分布廣泛的監(jiān)控?cái)z像頭進(jìn)行核輻射探測(cè)的可能性。本文對(duì)靜態(tài)場(chǎng)景下不遮光CMOS攝像頭進(jìn)行了初步實(shí)驗(yàn)驗(yàn)證:將約7.4×108 Bq的99 Tcm放射源置于羅技科技(Logitech)C170攝像頭旁不同距離處,在靜態(tài)場(chǎng)景下分別采集1 000幀視頻圖像,發(fā)現(xiàn)視頻圖像上產(chǎn)生了異常的隨機(jī)亮斑。本文提出一種幀間差分、高斯平滑和閾值判斷相結(jié)合的方法,甄別每幀圖像是否含有隨機(jī)亮斑,并采用TERRA-P多用途個(gè)人劑量報(bào)警儀進(jìn)行了對(duì)比實(shí)驗(yàn)。實(shí)驗(yàn)結(jié)果表明:可見光圖像上疊加的亮斑是由核輻射產(chǎn)生的,且每千幀視頻圖像中含亮斑幀數(shù)與輻射劑量率線性相關(guān),相關(guān)系數(shù)R=0.99;本文提出的算法可有效甄別靜態(tài)場(chǎng)景下不遮光CMOS攝像頭所采集視頻圖像中的放射性事件,即實(shí)現(xiàn)了對(duì)核輻射的探測(cè)。未來將進(jìn)一步優(yōu)化視頻處理算法,期望實(shí)現(xiàn)基于公共場(chǎng)所大量監(jiān)控?cái)z像頭的低成本核輻射監(jiān)測(cè)。
[Abstract]:CMOS sensors can interact directly with X / 緯 rays, Therefore, it is possible to use a widely distributed surveillance camera to detect nuclear radiation. This paper makes a preliminary experiment on the CMOS camera without shading in the static scene: the 99 Tcm radioactive source of about 7.4 脳 108Bq is placed in LogitechechC170, Logitechg Technology. At different distances next to the camera, In the static scene, 1 000 frames of video images were collected, and abnormal random bright spots were found in the video images. This paper presents a method of combining frame difference, Gao Si smoothing and threshold judgment. A comparative experiment was carried out to determine whether or not each frame image contains random bright spots. The experimental results show that the superimposed bright spots on the visible images are produced by nuclear radiation, and a TERRA-P multipurpose personal dose alarm instrument is used to carry out a comparative experiment. Moreover, the number of frames with bright spots in every thousand frames of video images is linearly correlated with the radiation dose rate, and the correlation coefficient is 0.99. The algorithm proposed in this paper can effectively identify the radioactive events in the video images captured by the unshaded CMOS camera in the static scene. In the future, the video processing algorithm will be further optimized to achieve low-cost nuclear radiation monitoring based on a large number of surveillance cameras in public places.
【作者單位】： 北京科技大學(xué)自動(dòng)化學(xué)院;中日友好醫(yī)院放射腫瘤科;
【基金】：中央高�；究蒲袠I(yè)務(wù)費(fèi)資助項(xiàng)目(FRF-TP-15-114A1) 國(guó)家自然科學(xué)基金資助項(xiàng)目(11505300,11605008)
【分類號(hào)】：R144;TP334.2

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