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<!DOCTYPE html>
<html class="no-js" lang="en">
<head>
<meta charset="utf-8"/>
<meta content="width=device-width,initial-scale=1" name="viewport"/>
<link href="https://jomjol.github.io/AI-on-the-edge-device-docs/Reference-Image/" rel="canonical"/>
<link href="../FAQs/" rel="prev"/>
<link href="../Alignment/" rel="next"/>
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<title>Reference Image - AI on the Edge Device</title>
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<label class="md-overlay" for="__drawer"></label>
<div data-md-component="skip">
<a class="md-skip" href="#reference-image">1.
Skip to content
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</div>
<div data-md-component="announce">
</div>
<header class="md-header md-header--shadow" data-md-component="header">
<nav aria-label="Header" class="md-header__inner md-grid">
<a aria-label="AI on the Edge Device" class="md-header__button md-logo" data-md-component="logo" href=".." title="AI on the Edge Device">
<img alt="logo" src="../img/logo.svg"/>
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<div class="md-header__title" data-md-component="header-title">
<div class="md-header__ellipsis">
<div class="md-header__topic">
<span class="md-ellipsis">
AI on the Edge Device
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<div class="md-header__topic" data-md-component="header-topic">
<span class="md-ellipsis">
Reference Image
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Initializing search
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GitHub
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<div class="md-container" data-md-component="container">
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GitHub
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<span class="md-ellipsis">
Getting Started
</span>
<span class="md-nav__icon md-icon"></span>
</label>
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Getting Started
</label>
<ul class="md-nav__list" data-md-scrollfix="">
<li class="md-nav__item">
<a class="md-nav__link" href="..">
<span class="md-ellipsis">
Welcome
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../Installation/">
<span class="md-ellipsis">
Installation
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../initial-setup/">
<span class="md-ellipsis">
Initial Setup
</span>
</a>
</li>
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<a class="md-nav__link" href="../Hardware-Compatibility/">
<span class="md-ellipsis">
Hardware Compatibility
</span>
</a>
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<a class="md-nav__link" href="../Best-Practice/">
<span class="md-ellipsis">
Best Practice
</span>
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<a class="md-nav__link" href="../FAQs/">
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Frequently Asked Questions
</span>
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Configuration
</span>
<span class="md-nav__icon md-icon"></span>
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<nav aria-expanded="true" aria-labelledby="__nav_2_label" class="md-nav" data-md-level="1">
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<span class="md-nav__icon md-icon"></span>
Configuration
</label>
<ul class="md-nav__list" data-md-scrollfix="">
<li class="md-nav__item md-nav__item--active">
<input class="md-nav__toggle md-toggle" id="__toc" type="checkbox"/>
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Reference Image
</span>
<span class="md-nav__icon md-icon"></span>
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Reference Image
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<nav aria-label="Table of contents" class="md-nav md-nav--secondary">
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Table of contents
</label>
<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix="">
<li class="md-nav__item">
<a class="md-nav__link" href="#focus">1.1
<span class="md-ellipsis">
Focus
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="#correct-horizontal-alignment">1.2
<span class="md-ellipsis">
Correct Horizontal Alignment
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="#dealing-with-reflections">1.3
<span class="md-ellipsis">
Dealing with Reflections
</span>
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</ul>
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</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../Alignment/">
<span class="md-ellipsis">
Alignment References
</span>
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</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../ROI-Configuration/">
<span class="md-ellipsis">
ROIs (Regions of Interest)
</span>
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<a class="md-nav__link" href="../Configuration/">
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Graphical Configuration
</span>
</a>
</li>
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<a class="md-nav__link" href="../Choosing-the-Model/">
<span class="md-ellipsis">
Model Selection
</span>
</a>
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<li class="md-nav__item">
<a class="md-nav__link" href="../ota/">
<span class="md-ellipsis">
Over-The-Air (OTA) Update
</span>
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Advanced
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Advanced
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<ul class="md-nav__list" data-md-scrollfix="">
<li class="md-nav__item">
<a class="md-nav__link" href="../Parameters/">
<span class="md-ellipsis">
Parameters
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../Integration-Home-Assistant/">
<span class="md-ellipsis">
Integration into Home Assistant
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../External-LED/">
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External LED
</span>
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<a class="md-nav__link" href="../data-logging/">
<span class="md-ellipsis">
Data Logging
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../Password-Protection/">
<span class="md-ellipsis">
Password Protection
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../unstable-installation/">
<span class="md-ellipsis">
Living on the Edge
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../Watermeter-specific-analog---digit-transition/">
<span class="md-ellipsis">
Analog/Digit Transition on Water Meters
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../collect-new-images/">
<span class="md-ellipsis">
Collect images to improve the models
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../Learn-models-with-your-own-images/">
<span class="md-ellipsis">
Learn a model with your own images
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../Correction%20Algorithm/">
<span class="md-ellipsis">
Correction Algorithm
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../Neural-Network-Types/">
<span class="md-ellipsis">
Neural Network Types
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../Additional-Information/">
<span class="md-ellipsis">
Additional Information
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../New-Releases-Notification/">
<span class="md-ellipsis">
Notification about new Releases
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../prometheus-openmetrics/">
<span class="md-ellipsis">
Prometheus/OpenMetrics
</span>
</a>
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</ul>
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Troubleshooting
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Troubleshooting
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<li class="md-nav__item">
<a class="md-nav__link" href="../Error-Codes/">
<span class="md-ellipsis">
Reduced webinterface (error codes)
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../StatusLED-BlinkCodes/">
<span class="md-ellipsis">
Board status LED (blink codes)
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../WLAN-disconnect-reason/">
<span class="md-ellipsis">
WLAN disconnect reasons
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../Error-Debugging/">
<span class="md-ellipsis">
Often observed issues
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../Frequent-Reboots/">
<span class="md-ellipsis">
Basic hardware/config issues
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../Demo-Mode/">
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Demo mode
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</ul>
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Quick Links
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Quick Links
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<ul class="md-nav__list" data-md-scrollfix="">
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<a class="md-nav__link" href="https://github.com/jomjol/AI-on-the-edge-device/releases">
<span class="md-ellipsis">
Releases
</span>
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</li>
<li class="md-nav__item">
<a class="md-nav__link" href="https://jomjol.github.io/AI-on-the-edge-device/index.html">
<span class="md-ellipsis">
Web Installer/Console
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="https://github.com/jomjol/AI-on-the-edge-device/issues">
<span class="md-ellipsis">
Create an Issue
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="https://github.com/jomjol/AI-on-the-edge-device/discussions">
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Join a Discussion
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<input class="md-nav__toggle md-toggle" id="__nav_6" type="checkbox"/>
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API's
</span>
<span class="md-nav__icon md-icon"></span>
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<nav aria-expanded="false" aria-labelledby="__nav_6_label" class="md-nav" data-md-level="1">
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<span class="md-nav__icon md-icon"></span>
API's
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<ul class="md-nav__list" data-md-scrollfix="">
<li class="md-nav__item">
<a class="md-nav__link" href="../REST-API/">
<span class="md-ellipsis">
REST API
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../MQTT-API/">
<span class="md-ellipsis">
MQTT API
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../Influx-DB/">
<span class="md-ellipsis">
Influx DB
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../Webhook/">
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Webhook
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</li>
</ul>
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<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle" id="__nav_7" type="checkbox"/>
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Development
</span>
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<a class="md-nav__link" href="#focus">1.1
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Focus
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Correct Horizontal Alignment
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Dealing with Reflections
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<h1 id="reference-image"><span class="enumerate-headings-plugin enumerate-heading-plugin">1.</span> Reference Image</h1>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The Reference Image is the basis for the coordinate system of the ROIs. Therefore it is very important, to have a well aligned image, that is not rotated. </p>
</div>
<p>At first an example image is shown.
To define a new reference image push the button <code>"Create new Reference" (2)</code> and afterwards <code>"Take Image" (2)</code>. It might take some seconds for processing, then your actual camera image should be shown.
Then play with the provided parameters to get a good result.</p>
<p><img alt="" src="../img/initial_setup_1_reference_image.jpg" style="width:500px"/></p>
<h2 id="focus"><span class="enumerate-headings-plugin enumerate-heading-plugin">1.1</span> Focus</h2>
<p>This is the first time, where you have access to the camera image. It most likely is out of focus and not sharp!
Ensure a sharp image of the camera by adjusting the focal length of the ESP OV2640 camera.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Try to adjust the focus for the clearest possible image!</p>
</div>
<p>In order to use it for reading a meter, the focal-length of the OV2640 camera has to be manipulated.
By default it only results in sharp image for distance bigger than around <code>~40cm</code> which is not ideal for our purpose.</p>
<p>Therefore you need to remove the fixing glue of the OV2640 lens with a sharp knife. After this you can rotate the lens in and out. Rotating it by about a quarter of a turn counterclockwise results in a focus plane shift of about 10cm. You need to figure out your best setting with a little bit of trial and error for your specific environment.</p>
<div class="admonition error">
<p class="admonition-title">Error</p>
<p>Be <strong>very</strong> carefully when rotating the lens. Best is to held the camera itself with one hand or a plier and rotate the lens with the other hand.
Make sure <strong>not</strong> to rotate the whole camera as this can damage the ribbon cable!</p>
</div>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>This modification will void any warranty, as the sealing of the lens objective is broken!</p>
</div>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>This modification will render the camera unsuitable for general, web-cam type applications unless the focal length is changed back to the original setting.</p>
</div>
<p><img alt="" src="../img/focus_adjustment.jpg"/></p>
<h2 id="correct-horizontal-alignment"><span class="enumerate-headings-plugin enumerate-heading-plugin">1.2</span> Correct Horizontal Alignment</h2>
<p>Ensure an <strong>exact horizontal alignment</strong> of the number:</p>
<table>
<thead>
<tr>
<th>✔️ Okay</th>
<th>❌ Not Okay</th>
</tr>
</thead>
<tbody>
<tr>
<td><img alt="" src="../img/alignment_okay.jpg"/></td>
<td><img alt="" src="../img/alignment_not_okay.jpg"/></td>
</tr>
</tbody>
</table>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>Updating the reference image also means that all alignment images and ROIs needs to be configured again.
Therefore do this step later only with caution.</p>
</div>
<p>If everything is done, you can save the result with <code>"Update Reference Image" (4)</code>.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>A reboot is not required at this point of time.</p>
</div>
<p>As next you should update the <a href="../Alignment/">Alignment References</a>.</p>
<h2 id="dealing-with-reflections"><span class="enumerate-headings-plugin enumerate-heading-plugin">1.3</span> Dealing with Reflections</h2>
<p>Reflections can be caused by the flash LED and make it hard to provide a reliable detection.
There are various ways to deal with them:</p>
<ul>
<li>Attach a diffusor in front of the LED, eg. a filt (Filz) or parchment paper. Also white paper can do the job.</li>
<li>Rotate the ESP-CAM so the LED is on another place.</li>
<li>Reduce the LED intensity.</li>
<li>Use external LED stripes, eg <code>WS2812x</code>.</li>
</ul>
</article>
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