camera_intrinsics 0.0.4

A Flutter plugin to retrieve camera intrinsics (focal length, principal point, image dimensions, distortion coefficients) using ARCore (Android) and ARKit (iOS).

camera_intrinsics

A Flutter plugin to retrieve camera intrinsics from ARCore (Android) and ARKit (iOS) for camera calibration and image geometry calculations.

Platform Support

Android	iOS
✅	✅

Requirements

Android

• minSdkVersion: 24 or higher
• ARCore: Device must support ARCore (Google Play Services for AR)
• Camera Permission: Required at runtime

iOS

• iOS: 13.0 or higher
• ARKit: Device must support ARKit (iPhone 6s or later)
• Camera Permission: Required (add to Info.plist)

Limits

• iOS: Distortion coefficients unavailable

Setup

Android

Add the following to your app's AndroidManifest.xml inside the <application> tag:

<meta-data
    android:name="com.google.ar.core"
    android:value="required" />

iOS

Add camera permission to your Info.plist:

<key>NSCameraUsageDescription</key>
<string>Camera access is required to get camera intrinsics</string>

Usage

import 'package:camera_intrinsics/camera_intrinsics.dart';

// Get camera intrinsics
try {
  final response = await CameraIntrinsics.getIntrinsics();

  final intrinsics = response.intrinsics;
  print('Focal Length: ${intrinsics['focalLength']}');
  print('Principal Point: ${intrinsics['principalPoint']}');
  print('Image Dimensions: ${intrinsics['imageDimensions']}');
  print('Distortion: ${intrinsics['distortion']}');
  print('Was cached: ${response.isCached}');
} on PlatformException catch (e) {
  print('Error: ${e.message}');
}

// Clear cache if you need fresh data
CameraIntrinsics.clearCache();

Response Data

Field	Type	Description
focalLength	List<double>	Focal length in pixels [fx, fy]
principalPoint	List<double>	Principal point [cx, cy]
imageDimensions	List<int>	Image size [width, height]
distortion	List<double>	Distortion coefficients (Android only, empty on iOS)

Error Codes

Android

Code	Description
CAMERA_PERMISSION_NOT_GRANTED	Camera permission was denied
NOT_ATTACHED	Plugin not attached to activity
INTRINSICS_UNAVAILABLE	Could not get intrinsics (tracking failed)
ARCORE_ERROR	ARCore session error

iOS

Code	Description
ARKIT_NOT_SUPPORTED	ARKit is not supported on this device
INTRINSICS_UNAVAILABLE	No AR frame available