Initial Work

lib/main.dart

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+import 'dart:async';
+import 'package:camera/camera.dart';
+import 'dart:typed_data';
+
+import 'package:flutter/material.dart';
+
+List<CameraDescription> cameras = [];
+
+Future<void> main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+
+  cameras = await availableCameras();
+  runApp(CameraApp());
+}
+
+class CameraApp extends StatefulWidget {
+  @override
+  _CameraAppState createState() => _CameraAppState();
+}
+
+class _CameraAppState extends State<CameraApp> {
+  CameraController? controller;
+  var streaming = false;
+  var image_width = 0;
+  var image_height = 0;
+  var posy = 0.0;
+  var posx = 0.0;
+  Uint8List? previousImage;
+  Uint8List? diff;
+  Uint8List? dst;
+  Float32List? background;
+  Float64List? sums;
+
+  @override
+  void initState() {
+    super.initState();
+    controller = CameraController(cameras[1], ResolutionPreset.low);
+    controller!.initialize().then((_) {
+      if (!mounted) {
+        return;
+      }
+      setState(() {});
+    });
+  }
+
+  @override
+  void dispose() {
+    controller?.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final CameraController cameraController = controller!;
+    if (!cameraController.value.isInitialized) {
+      return Container();
+    }
+
+    return MaterialApp(
+      home: Scaffold(
+        appBar: AppBar(
+          title: const Text('Home'),
+        ),
+        body: Column(children: <Widget>[
+          CameraPreview(cameraController),
+        ]),
+        floatingActionButton: FloatingActionButton(
+          child: const Icon(Icons.plus_one),
+          onPressed: () {
+            startStream();
+          },
+        ),
+      ),
+      debugShowCheckedModeBanner: false,
+    );
+  }
+
+  void startStream() {
+    final CameraController? cameraController = controller;
+
+    if (cameraController == null || !cameraController.value.isInitialized) {
+      return;
+    }
+
+    if (streaming == false) {
+      cameraController.startImageStream(handleImage);
+    } else {
+      cameraController.stopImageStream();
+    }
+
+    setState(() {
+      streaming = !streaming;
+    });
+  }
+
+  void handleImage(CameraImage src) {
+    sums = Float64List(src.height);
+    
+    if (previousImage == null || background == null) {
+      previousImage = Uint8List(src.planes[0].bytes.length);
+      dst = Uint8List(src.planes[0].bytes.length);
+      diff = Uint8List(src.planes[0].bytes.length);
+      background = Float32List(src.planes[0].bytes.length);
+      image_width = src.width;
+      image_height = src.height;
+    } else {
+      for (var i = 0; i < src.width; i++) {
+        for (var j = 0; j < src.height; j++) {
+          //Background calculation
+          background![i + j] = (background![i + j] * 0.99 +
+              src.planes[0].bytes[i + j].toDouble() * (1.0 - 0.99));
+
+          //Difference calculation
+          var diff_val =
+              (background![i + j].toInt() - src.planes[0].bytes[i + j]).abs();
+          if (diff_val > 50) {
+            diff![i + j] = diff_val;
+          } else {
+            diff![i + j] = 0;
+          }
+
+          //Center of motion calc
+          sums[i] += 
+        }
+      }
+      // Processing
+      print(diff![0]);
+      // End Processing
+      previousImage = src.planes[0].bytes;
+    }
+  }
+}