本文關(guān)鍵詞： 數(shù)字?jǐn)z像儀 網(wǎng)絡(luò) 本安型 低照度 MCCD ARM　出處：《西安科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：礦井下地形復(fù)雜、環(huán)境惡劣,許多地方光線極弱,事故隱患點(diǎn)多,若空氣中瓦斯和粉塵的濃度較高,則容易引發(fā)爆炸事故,因此對礦井下的環(huán)境進(jìn)行實(shí)時(shí)監(jiān)控很有必要。而現(xiàn)有礦用攝像儀多為隔爆型,笨重且造價(jià)昂貴,尤其在低照度下現(xiàn)有攝像儀采集到的視頻圖像已經(jīng)無法滿足當(dāng)前人們對其高清晰度的要求。所以開發(fā)一種符合本質(zhì)安全原理且能夠運(yùn)用在低照度環(huán)境下的攝像儀設(shè)備在井下安全生產(chǎn)實(shí)時(shí)監(jiān)控具有極大的意義。為滿足低照度下能夠采集到高質(zhì)量的視頻圖像,本文提出設(shè)計(jì)一款用于礦井下并且低功耗,同時(shí)搭載高靈敏度圖像傳感器芯片攝像頭的數(shù)字網(wǎng)絡(luò)攝像儀,即礦用本安型網(wǎng)絡(luò)攝像儀設(shè)備,對比不同的驗(yàn)證試驗(yàn)結(jié)果,最終選則三星出品的ARM Cortex-A8系列的S5PV210處理器作為設(shè)備的核心控制芯片。以分塊化的設(shè)計(jì)思想設(shè)計(jì)并實(shí)現(xiàn)了礦用本安型網(wǎng)絡(luò)攝像儀設(shè)備,主要模塊包括視頻采集模塊、視頻解碼模塊、供電模塊、光強(qiáng)檢測模塊、輔助照明模塊、接口通信模塊等。其中,視頻采集模塊采用低照度模擬MCCD攝像機(jī),并使用940nm波長的激光紅外作為輔助光源,實(shí)現(xiàn)裝備前端低照度環(huán)境下視頻的采集,輸出的PAL全電視信號(hào)由TVP5150AM1視頻解碼器轉(zhuǎn)換成BT.656格式的數(shù)字信號(hào)傳送給核心處理單元,再由核心處理單元轉(zhuǎn)換成NV12格式的數(shù)字信號(hào)以便于壓縮成H.264格式的信號(hào)用于以太網(wǎng)傳輸?shù)浇K端顯示;供電模塊選用愛浦電子生產(chǎn)的VD10系列模塊;接口通信模塊包含以太網(wǎng)口以及各串口;設(shè)備設(shè)計(jì)遵循以太網(wǎng)通信協(xié)議,實(shí)現(xiàn)視頻數(shù)據(jù)的有線傳輸。電路采用分塊化設(shè)計(jì)、兩層PCB板設(shè)計(jì)、電磁兼容性設(shè)計(jì),大大增加了設(shè)備的穩(wěn)定性。在整個(gè)電路測試過程中,設(shè)備滿足低功耗本安設(shè)計(jì)等各種電氣功能的要求,并實(shí)現(xiàn)了一般環(huán)境以及模擬全黑環(huán)境下的視頻采集,實(shí)現(xiàn)了視頻的實(shí)時(shí)傳輸與顯示。實(shí)驗(yàn)表明礦用本安型網(wǎng)絡(luò)攝像儀設(shè)備能夠?qū)崿F(xiàn)井下低照度環(huán)境下的視頻的采集、處理和傳輸,具有一定的實(shí)用價(jià)值和研究意義。
[Abstract]:The underground topography is complex, the environment is bad, the light is very weak in many places, and there are many hidden danger points. If the concentration of gas and dust in the air is high, it is easy to cause the explosion accident. Therefore, it is necessary to monitor the environment under the mine in real time. However, most of the existing mine cameras are flame-proof, bulky and expensive. Especially, the video images collected by the present camera under low illumination can not meet the requirement of high definition. Therefore, we develop a kind of camera which conforms to the principle of intrinsic safety and can be used in low illuminance environment. It is of great significance for the equipment to monitor the underground safety production in real time. In order to meet the low illuminance, high quality video images can be collected. In this paper, a digital network camera which is used under mine and low power consumption is designed, which is also equipped with high sensitivity image sensor chip camera, that is, mine intrinsically safe network camera equipment. The results of different validation tests were compared. The final choice is Samsung's ARM. The S5PV210 processor of Cortex-A8 series is used as the core control chip of the equipment. The main modules include video acquisition module, video decoding module, power supply module, light intensity detection module, auxiliary lighting module, interface communication module and so on. The video acquisition module uses low illuminance simulation MCCD camera and 940nm laser infrared as auxiliary light source to realize video acquisition under low illumination environment. The output PAL full-TV signal is converted from a TVP5150AM1 video decoder to a digital signal in BT.656 format and transmitted to a core processing unit. The core processing unit is then converted into a digital signal in NV12 format so that the signal in H.264 format can be compressed for Ethernet transmission to the terminal display; The power supply module selects the VD10 series module which is produced by Apu Electronics. The interface communication module includes Ethernet port and each serial port. The design of the equipment follows the Ethernet communication protocol to realize the wired transmission of video data. The circuit adopts block design, two-layer PCB board design, electromagnetic compatibility design. It greatly increases the stability of the equipment. In the whole circuit testing process, the device meets the requirements of various electrical functions such as low power intrinsically safe design, and realizes video capture in general environment and simulation all black environment. The experiment shows that the video acquisition, processing and transmission under low illuminance environment can be realized by the local safety network camera equipment, which has certain practical value and research significance.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN948.41

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