62 lines
2.2 KiB
Markdown
62 lines
2.2 KiB
Markdown
<table>
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<tr>
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<th><a href="../README.md">README</a></th>
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<th><a href="./DEVICES.md">DEVICES</a></th>
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<th><a href="./FORMATS.md">FORMATS</a></th>
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<th>FRAME_PROCESSORS</th>
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<th><a href="./ANIMATED.md">ANIMATED</a></th>
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<th><a href="./ERRORS.md">ERRORS</a></th>
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</tr>
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</table>
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<br/>
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<h1 align="center">Frame Processors</h1>
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<div>
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<!-- TODO: Demo of QR code scanning or smth -->
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<img align="right" width="35%" src="../img/ultra-wide-demo.gif">
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</div>
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### What are frame processors?
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Frame processors are functions that are written in JavaScript (or TypeScript) which can be used to **process frames the camera "sees"**.
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For example, you might want to create a QR code scanner _without ever writing native code while still achieving almost-native performance_. Since you can write the scanning part yourself, you can implement a custom QR code system like the one Snapchat uses for Snap-codes.
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<div align="center">
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<img src="../img/snap-code.png" width="15%" />
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</div>
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<br />
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Frame processors are by far not limited to QR code detection, other examples include:
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* **AI** for **facial recognition**
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* **AI** for **object detection**
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* Using **Tensorflow**, **MLKit Vision** or other libraries (if they provide React Native JSI bindings in the form of "react-native-vision-camera plugins")
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* Creating **realtime video-chats** since you can directly send the camera frames over the network
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* Creating **snapchat-like filters**, e.g. draw a dog-mask filter over the user's face (WIP)
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* Creating **color filters** with depth-detection
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* Using **custom C++ processors** exposed to JS for maximum performance
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### Technical
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Frame processors are JS functions that will be **workletized** using [react-native-reanimated](https://github.com/software-mansion/react-native-reanimated). They are created on a **separate thread** using a separate Hermes/JSC Runtime and are **invoked synchronously** (using JSI) without ever going over the bridge.
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### Example
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```tsx
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function App() {
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const frameProcessor = useFrameProcessor((frame) => {
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const qrCodes = scanQrCodes(frame)
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console.log(qrCodes)
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}, [])
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return (
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<Camera frameProcessor={frameProcessor} {...cameraProps} />
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)
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}
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```
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> FRAME PROCESSORS ARE STILL WIP
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