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Co-Authored-By: kotte <14197736+mrtamagotchi@users.noreply.github.com> Co-Authored-By: mikaeltellhed <2311083+mikaeltellhed@users.noreply.github.com> Co-Authored-By: Tore Knudsen <18231882+torekndsn@users.noreply.github.com> Co-Authored-By: Michael Cartner <32543275+michaelcartner@users.noreply.github.com>
45 lines
3.8 KiB
Markdown
45 lines
3.8 KiB
Markdown
---
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title: Camera QR Scanner
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hide_title: true
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---
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<##head##>
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# Camera QR Scanner
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The **Camera QR Scanner** node is used to open the camera view finder and scan for QR codes. It uses a [Video](/nodes/basic-elements/video) node to display the camera stream.
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<div className="ndl-image-with-background l">
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</div>
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When a QR code has been successfully identified, the node will send a <span className="ndl-signal">Scan Successful</span> event and the decoded string, otherwise <span className="ndl-signal">Scan Failed</span>.
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In this node, the decoding happens in real time, meaning if the QR code is not visible anymore the node will send an event to indicate that the scanning failed.
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<##head##>
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## Inputs
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| Data | Description |
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| ------------------------------------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| <span className="ndl-data">Video Node</span> | This input should be connected to the **Dom Element** output of the **Video** node that's used render the camera view finder. |
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| <span className="ndl-data">Front Facing</span> | A **boolean** that decides if the front facing camera should be used (default) or the user facing came. |
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| <span className="ndl-data">Max Scans Per Second</span> | The number of scans per second the scanner will do to find QR codes. Lowering this number may improve performance if needed. Note that changing this number after triggering **Start** will have no effect. |
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| Signal | Description |
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| ----------------------------------------- | --------------------------------------------------------- |
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| <span className="ndl-signal">Start</span> | Opens the camera stream and starts scanning for QR codes. |
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| <span className="ndl-signal">Stop</span> | Stops the camera stream and stops scanning for QR codes. |
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## Outputs
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| Data | Description |
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| --------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------ |
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| <span className="ndl-data">Scan Result</span> | This output contains the decoded string when a QR code has been found and decoded. If no QR code is found this string will be empty. |
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| <span className="ndl-data">Valid Scan</span> | A **boolean** that is **true** if the last scan was valid, otherwise **false**. |
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| Signal | Description |
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| --------------------------------------------------- | ---------------------------------------------------------------------------------------------------- |
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| <span className="ndl-signal">Scan Successful</span> | Sends a signal when a successful scan was done. The resulting scan is on the **Scan Result** output. |
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| <span className="ndl-signal">Scan Failed</span> | Sends a signal when the latest scan failed, i.e. no QR code was found. |
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