同时区分多个跟踪图像？

Question

我的应用正在跟踪一组 5 张参考图像。但是，我希望它能够区分参考图像（即图像是图像 A、图像 B 还是图像 C。跟踪我打印在明信片上的真实照片）。

目前，我的代码能够检测到图像并在其上放置一个平面（即一个简单的矩形）。但是，我的问题是，是否可以区分该应用程序检测到的是图片A还是图片B？如果可以，怎么做？

我知道有一个使用 ML 的选项，但想看看 SceneKit/ARKit 中是否有我没有考虑过的更简单的选项；特别是因为我使用的是准确的图像，而不是试图让应用程序猜测一个对象。

class ViewController: UIViewController, ARSCNViewDelegate {
    
    @IBOutlet var sceneView: ARSCNView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        sceneView.delegate = self
    }
    
//MARK-: WHERE I CONFIGURE MY APP TO DETECT AN IMAGE

    override func viewWillAppear(_ animated: Bool) {
            super.viewWillAppear(animated)
            
            let configuration = ARImageTrackingConfiguration()
            
            guard let trackedImages = ARReferenceImage.referenceImages(inGroupNamed: "Photos", bundle: Bundle.main) else {
                print("No images available")
                return
            }
            
            configuration.trackingImages = trackedImages
            configuration.maximumNumberOfTrackedImages = 7
            
            sceneView.session.run(configuration)
    }
    
//MARK-: WHERE I PLACE A PLANE OVER THE DETECTED IMAGE

    func renderer(_ renderer: SCNSceneRenderer, nodeFor anchor: ARAnchor) -> SCNNode? {
            
            let node = SCNNode()
            
            if let imageAnchor = anchor as? ARImageAnchor {
                let plane = SCNPlane(width: imageAnchor.referenceImage.physicalSize.width, height: imageAnchor.referenceImage.physicalSize.height)

                plane.firstMaterial?.diffuse.contents = UIColor(white: 1, alpha: 0.8)

                let planeNode = SCNNode(geometry: plane)
                planeNode.eulerAngles.x = -.pi / 2

                node.addChildNode(planeNode)
            }
            return node
    }
    
}

Answer 1

您可以使用 referenceImage 和 name.

等实例属性轻松完成此操作

// The detected image referenced by the image anchor.
var referenceImage: ARReferenceImage { get }

和：

// A descriptive name for your reference image.
var name: String? { get set }

代码如下所示：

func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
    
    guard let imageAnchor = anchor as? ARImageAnchor,
          let _ = imageAnchor.referenceImage.name
    else { return }
    
    anchorsArray.append(imageAnchor)

    if imageAnchor.referenceImage.name == "apple" {
        print("Image with apple is successfully detected...")
    }
}

Answer 2

根据安迪的解决方案，我使用了下面的代码，并使用变量 imageName 作为参考。


func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
    guard let imageAnchor = anchor as? ARImageAnchor else { return }
    let referenceImage = imageAnchor.referenceImage
        let imageName = referenceImage.name ?? "no name"
        
}

同时区分多个跟踪图像？

Distinguish between multiple tracked images at the same time?

swift

augmented-reality

scenekit

arkit

scene