Automatic License Plate Recognition Camera Team 2010 Sponsored by - - PowerPoint PPT Presentation

Automatic License Plate Recognition Camera

Team 2010

Sponsored by Control Module, Inc

Cavin Farley Gavin Colwell Zachary Murtishi

Project Overview

• Goal

○ Design a camera system platform for the purpose of performing license plate recognition

• Requirements

○ Waterproof/Weatherproof ○ Automotive Temperature Grade 3 (-40°C to +85°C) ○ Single Ethernet port ■ Power over Ethernet ○ Sensors to detect motion, humidity, and temperature ○ Unit cost under $500

• Joint Project with CSE

○ CSE is responsible for computer vision algorithms

Solution

• Data and image communication software system

○ Written in Python and C ○ Will run on Variscite MX8X microcomputer running Debian Linux (ARM build) ○ Captures image frames from USB, forwards to remote system via TCP protocol

• Electronic circuitry for peripheral support

○ Microcomputer used is in a SOM package (Variscite MX8X) ■ No peripheral support without carrier board ○ Electronic circuitry needed to connect this board to Ethernet, I2C, USB buses Variscite MX8X

System Diagram

Software Specifications

• Client

○ Nvidia TX2 serves as the “client” / image processor ○ Receives image packets and sensor data from server and performs image processing and logical operations on them (CSE group’s algorithms) ○ Issues commands to rest of system depending on their contents

• Server

○ Variscite MX8X serves as the “server” / camera ○ Transmits image packets and sensor data to client for processing ○ Receives orders from client to change peripheral settings, network configuration, bus addresses, etc.

Data Communication

Interprocess communications

• Communication between Python (imaging and networking) and C (I2C)

application software

• Uses sockets on localhost/127.0.0.1

Local area network communications

• Communication between Nvidia TX2 image processor and Variscite MX8X

camera processor (currently, TX2 is simulated by a computer running macOS) via TCP socket

• Uses sockets between internal IP addresses

Interface

Camera interface Client interface

Network Data

Wireshark data pertaining to TCP data transmission of image packets Resulting transmission is ~15-30 frames per second over 54Mbps wireless connection

Final System Assembly

Final System Assembly

Coupler PoE adapter Carrier board System-on-module Accelerometer Temperature sensor Camera

Image Quality

Image transmitted at 640x480 resolution Image transmitted over 54Mbps wireless connection with 100Mbps Ethernet (bottleneck) Resulting image preserves quality over wireless transmission

OCR / Text Recognition

Images captured by camera can be successfully evaluated with Google Tesseract OCR

Finished PCBs

PCB Schematic Design (cont.)

PCB Schematic Design (cont.)

PCB Schematic Design (cont.)

PCB Schematic Design (cont.)

PCB Schematic Design (cont.)

PCB Layout

Project Management

Budget

Item Quantity Cost Total

PCB Fabrication x 5 5 $32.40 $162.00 PCB Stencil 1 $67.53 67.53 Components for PCB

• $91.74

Enclosure components 1 $50.84 $50.84 MX8X Development Kit 1 $499 $499.00 ELP 8MP USB Camera 1 $74.99 $74.99 Humidity Sensor 1 $7.95 $7.95 3-axis Accelerometer 1 $9.95 $9.95 Temperature Sensor 1 $13.95 $13.95 F/F Jumper Cables 1 $1.95 $1.95 Estimated cost per unit: $297 Development expenses: $995.79, not including tax or shipping costs

• Initial budget: $2,000
• Majority of cost was for

development

• Final cost per unit

○ $297

Responsibilities

Constraints

• Time table

○ Designing a complex PCB ■ Over 200 components

• PCB Assembly

○ Originally anticipated on having it done by an assembly company ■ Number of parts made it too expensive ■ Less expensive assembly would take several weeks ○ Zachary had to assemble

• COVID-19

○ The PCB took much longer to produce than expected ○ Less access to engineering equipment ○ More difficult to collaborate