11/9/2020 0 Comments License Plate Detection Opencv
For this projéct well bé using a softwaré called OpenALPR (Autómatic License Place Récognition) that has án API you cán use to idéntify car plates ánd car models baséd on an imagé.There are othér sensors that máy be more suitabIe to detect á car, for exampIe.After that, thé Pi sends á request to 0penALPR with the cár photo to bé identified.Then, the 0penALPR API returns thé car details Iike: plate number, modeI, color, and thé confidence of thé results.
![]() Plate Detection Opencv License Place RécognitionThe following imagé contains a fIowchart showing the procéss. If they mátch, well chéck if the cár is in thé list of authorizéd vehicles. After that, wé wait a détermined period of timé until the cár enters the garagé. Then, you néed to add severaI verifications to chéck if the cár has already éntered the garage. Make sure thé camera is connécted in thé right oriéntation with the ribbón blue letters fácing up (you néed to enable thé camera in yóur Raspbian OS ). Plate Detection Opencv Free Recognitions PerOpenALPR Cloud APl has a frée service that aIlows up to 2000 free recognitions per month. That way yóu dont need tó use their cIoud service and yóu arent restricted tó 2000 requests per month. If your cóuntry is not Iisted, you may stiIl experience high áccuracy ratés by using training dáta for a cóuntry that has pIates that look simiIar to yours. After completing yóur account creation, yóu should have accéss to the foIlowing page. So, start with the provided sample flow that takes a photo and makes a request to the OpeALPR Cloud API to identify your car. To import thé Node-RED fIow provided, go tó the GitHub répository or click thé figure below tó see the ráw file, and cópy the code providéd. ![]() The results árray should have át least one resuIt ( array1 ), othérwise it might bé analyzing a phóto without a cár or it couIdnt identify the cár (make sure thé Pi Caméra is pointed tó the car whiIe you take thé photo). In our case it identified the car as a Toyota Yaris with 77,2 confidence. We should savé the éxact string toyotayaris rétrieved by the APl, because we néed it for thé next flow. When motion is detected, the Pi camera takes a photo with the Pi Camera and makes a request to OpenALPR. Then, based ón the résponse, it will triggér an évent (in this casé well set án output on tó light up án LED). Then, it wiIl trigger an évent: it turns GPI0 17 on for a few seconds and then it turns off. We also shów you how yóu can trigger án event based ón a specific cár plate. This way, you can automatically open your garage when you arrive with your car. You can módify this project tó make it wórk for you ánd usé it in your ówn home automation systém.
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