ARCore丨图片识别

1、完成这篇文章所示内容

2、新建Canvas，添加名为FitToScanOverlay的Raw Image，

      a、为其添加AspectRatioFitter，Aspect Mode设置为Fit In Parent，Aspect Ratio设置为0.5625

      b、RawImage的Texture设置为fit_to_scan

      c、锚点、大小设置为父物体大小

做这一步是因为获取最佳追踪的技巧：物理图像必须占据相机图像的40%。

3、选中你要识别的图片，右键-Create > GoogleARCore > AugmentedImageDatabase.

4、右键-Create > GoogleARCore  > SessionConfig，设置AugmentedImageDatabase

      ARCoreSessionConfig的Plane Finding Mode：Disableed

5、将4创建的ARCoreSessionConfig赋值给ARCore Device

6、为扫描图片会出现的对象添加如下脚本：新建名为AugmentedImageVisualizerOverride的脚本，内容如下

namespace GoogleARCore.Examples.AugmentedImage
{
    using GoogleARCore;
    using UnityEngine;
   
    public class AugmentedImageVisualizerOverride : MonoBehaviour
    {
        public AugmentedImage Image;

        public void Update()
        {
            if (Image == null || Image.TrackingState != TrackingState.Tracking)
            {
                return;
            }
        }
    }
}

7、新建名为ImageController的gameObject，挂载名为ARCoreImageController的脚本

      a、为脚本的AugmentedImageVisualizerPrefab赋值6的要显示的物体（注意：此处对象的顺序就是图片库的顺序，这样才能使扫描的图片对应相应的对象）

      b、FitToScanOverlay属性赋值2的FitToScanOverlay

脚本内容如下：

namespace GoogleARCore.Examples.AugmentedImage
{
    using System.Collections.Generic;
    using GoogleARCore;
    using UnityEngine;

    public class ARCoreImageController : MonoBehaviour
    {

        [Header("Drag Augmented Image prefab to this")]
        public List  AugmentedImageVisualizerPrefab;

        [Header("Drag FitToScanOverlay to this")]
        public GameObject FitToScanOverlay;

        private Dictionary m_Visualizers = new Dictionary();
        private List m_TempAugmentedImages = new List();

        public void Update()
        {
            if (Input.GetKey(KeyCode.Escape))
            {
                Application.Quit();
            }

            if (Session.Status != SessionStatus.Tracking)
            {
                return;
            }

            Session.GetTrackables(m_TempAugmentedImages, TrackableQueryFilter.Updated);

            foreach (var image in m_TempAugmentedImages)
            {
                Debug.Log("name1111111" + image.Name);
                Debug.Log("index1111111" + image.DatabaseIndex);
                AugmentedImageVisualizerOverride visualizer = null;
                m_Visualizers.TryGetValue(image.DatabaseIndex, out visualizer);
                if (image.TrackingState == TrackingState.Tracking && visualizer == null)
                {
                    Debug.Log("name" + image.Name);
                    Debug.Log("index" + image.DatabaseIndex);
                    Anchor anchor = image.CreateAnchor(image.CenterPose);
                    visualizer =AugmentedImageVisualizerPrefab[image.DatabaseIndex];
                    visualizer.gameObject.SetActive(true);
                    visualizer.transform.parent = anchor.transform;
                    visualizer.transform.localPosition = Vector3.zero;
                    visualizer.transform.localRotation = new Quaternion(0,0,0,0);
                    visualizer.transform.parent = null;
                    visualizer.Image = image;
                    m_Visualizers.Add(image.DatabaseIndex, visualizer);
                }
            }

            foreach (var visualizer in m_Visualizers.Values)
            {
                if (visualizer.Image.TrackingState == TrackingState.Tracking)
                {
                    FitToScanOverlay.SetActive(false);
                    return;
                }
            }
        }

        //重置位置方法
        public void OnclickRe(int index)
        {
            AugmentedImageVisualizerOverride visualizer = null;
            m_Visualizers.TryGetValue(index, out visualizer);
            if (visualizer!=null)
            {
                m_Visualizers.Remove(index);
                visualizer.gameObject.SetActive(false);
                FitToScanOverlay.SetActive(true);
            }
        }
    }
}

8、正在更新。。。