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<a href=".." class="icon icon-home"> AI on the Edge Device
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<li class="toctree-l1"><a class="reference internal" href="..">Welcome</a>
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<p class="caption"><span class="caption-text">Configuration</span></p>
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<ul class="current">
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<li class="toctree-l1 current"><a class="reference internal current" href="./">Reference Image</a>
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<li class="toctree-l2"><a class="reference internal" href="#focus">Focus</a>
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<li class="toctree-l2"><a class="reference internal" href="#correct-horizontal-alignment">Correct Horizontal Alignment</a>
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<li class="toctree-l2"><a class="reference internal" href="#dealing-with-reflections">Dealing with Reflections</a>
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<li class="toctree-l1"><a class="reference internal" href="../Alignment/">Alignment References</a>
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<li class="toctree-l1"><a class="reference internal" href="../ROI-Configuration/">ROIs (Regions of Interest)</a>
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<li class="toctree-l1"><a class="reference internal" href="../Configuration/">Graphical Configuration</a>
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<li class="toctree-l1"><a class="reference internal" href="../Choosing-the-Model/">Model Selection</a>
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<li class="toctree-l1"><a class="reference internal" href="../ota/">Over-The-Air (OTA) Update</a>
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<p class="caption"><span class="caption-text">Advanced</span></p>
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<li class="toctree-l1"><a class="reference internal" href="../Parameters/">Parameters</a>
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<li class="toctree-l1"><a class="reference internal" href="../Integration-Home-Assistant/">Integration into Home Assistant</a>
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<li class="toctree-l1"><a class="reference internal" href="../External-LED/">External LED</a>
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<li class="toctree-l1"><a class="reference internal" href="../data-logging/">Data Logging</a>
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<li class="toctree-l1"><a class="reference internal" href="../rolling-installation/">Living on the Edge</a>
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<li class="toctree-l1"><a class="reference internal" href="../Watermeter-specific-analog---digital-transition/">Analog/Digital Transition on Water Meters</a>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="../collect-new-images/">Collect images to improve the models</a>
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<li class="toctree-l1"><a class="reference internal" href="../Learn-models-with-your-own-images/">Learn a model with your own images</a>
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<li class="toctree-l1"><a class="reference internal" href="../Correction%20Algorithm/">Correction Algorithm</a>
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<li class="toctree-l1"><a class="reference internal" href="../Neural-Network-Types/">Neural Network Types</a>
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<li class="toctree-l1"><a class="reference internal" href="../Additional-Information/">Additional Information</a>
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<li class="toctree-l1"><a class="reference internal" href="../New-Releases-Notification/">Notification about new Releases</a>
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<p class="caption"><span class="caption-text">Troubleshooting</span></p>
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<li class="toctree-l1"><a class="reference internal" href="../Error-Codes/">Error Codes</a>
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<li class="toctree-l1"><a class="reference internal" href="../Error-Debugging/">Error Debugging</a>
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<li class="toctree-l1"><a class="reference internal" href="../Frequent-Reboots/">Frequent Reboots</a>
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<li class="toctree-l1"><a class="reference internal" href="../Demo-Mode/">Demo Mode</a>
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<p class="caption"><span class="caption-text">API's</span></p>
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<li class="toctree-l1"><a class="reference internal" href="../REST-API/">REST API</a>
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<li class="toctree-l1"><a class="reference internal" href="../MQTT-API/">MQTT API</a>
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<li class="toctree-l1"><a class="reference internal" href="../Influx-DB/">Influx DB</a>
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<li class="toctree-l1"><a class="reference internal" href="../Build-Instructions/">Build the Project</a>
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<li class="toctree-l1"><a class="reference internal" href="../Upload-files-by-script/">Scripted File Upload</a>
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<li class="toctree-l1"><a class="reference internal" href="../Testing/">Testing</a>
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<li class="toctree-l1"><a class="reference internal" href="../Release-creation/">Preparing for Release</a>
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<li class="toctree-l1"><a class="reference internal" href="../outdated--Integrated-Functions/">Integrated Functions</a>
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<p class="caption"><span class="caption-text">Assorted Pages</span></p>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../StatusLED-BlinkCodes/">StatusLED BlinkCodes</a>
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<a href="https://github.com/jomjol/AI-on-the-edge-device-docs/edit/main/docs/Reference-Image.md" class="icon icon-github"> Edit on GitHub</a>
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<div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
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<h1 id="reference-image">Reference Image</h1>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<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>
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</div>
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<p>At first an example image is shown.
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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.
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Then play with the provided parameters to get a good result.</p>
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<p><img alt="" src="../img/initial_setup_1_reference_image.jpg" style="width:500px" /></p>
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<h2 id="focus">Focus</h2>
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<p>This is the first time, where you have access to the camera image. It most likely is out of focus and not sharp!
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Ensure a sharp image of the camera by adjusting the focal length of the ESP OV2640 camera.</p>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p>Try to adjust the focus for the clearest possible image!</p>
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</div>
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<p>In order to use it for reading a meter, the focal-length of the OV2640 camera has to be manipulated.
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By default it only results in sharp image for distance bigger than around <code>~40cm</code> which is not ideal for our purpose.</p>
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<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>
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<div class="admonition error">
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<p class="admonition-title">Error</p>
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<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.
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Make sure <strong>not</strong> to rotate the whole camera as this can damage the ribbon cable!</p>
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</div>
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<div class="admonition warning">
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<p class="admonition-title">Warning</p>
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<p>This modification will void any warranty, as the sealing of the lens objective is broken!</p>
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</div>
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<div class="admonition warning">
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<p class="admonition-title">Warning</p>
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<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>
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</div>
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<p><img alt="" src="../img/focus_adjustment.jpg" /></p>
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<h2 id="correct-horizontal-alignment">Correct Horizontal Alignment</h2>
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<p>Ensure an <strong>exact horizontal alignment</strong> of the number:</p>
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<table>
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<thead>
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<tr>
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<th>✔️ Okay</th>
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<th>❌ Not Okay</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><img alt="" src="../img/alignment_okay.jpg" /></td>
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<td><img alt="" src="../img/alignment_not_okay.jpg" /></td>
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</tr>
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</tbody>
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</table>
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<div class="admonition warning">
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<p class="admonition-title">Warning</p>
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<p>Updating the reference image also means that all alignment images and ROIs needs to be configured again.
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Therefore do this step later only with caution.</p>
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</div>
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<p>If everything is done, you can save the result with <code>"Update Reference Image" (4)</code>.</p>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p>A reboot is not required at this point of time.</p>
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</div>
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<p>As next you should update the <a href="../Alignment/">Alignment References</a>.</p>
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<h2 id="dealing-with-reflections">Dealing with Reflections</h2>
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<p>Reflections can be caused by the flash LED and make it hard to provide a reliable detection.
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There are various ways to deal with them:</p>
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<ul>
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<li>Attach a diffusor in front of the LED, eg. a filt (Filz) or parchment paper. Also white paper can do the job.</li>
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<li>Rotate the ESP-CAM so the LED is on another place.</li>
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<li>Reduce the LED intensity.</li>
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<li>Use external LED stripes, eg <code>WS2812x</code>.</li>
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</ul>
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