NullReferenceException: Object reference not set to an instance of an objectを直したい

WebカメラとOpenCVSharpを使ってARマーカの座標を取得したいと考えています。
demoにあるLiveSketchとMarker_Detectorを組み合わせることでマーカ認識自体はできたのですが、その座標を別スクリプトで使用したいです。
具体的にはLiveSketchScriptからMarkerTrackingのWStartpに座標を入れたいです。
cornerがマーカ座標だと思うのでそれを入れようとしています。
そのあと、２つのマーカの中心同士の距離を計算したいです。

現状は起動はするものの、Debug.Logで確認するとWStartpはNULLと出てしまい、下記のエラーが大量に表示されます。

よろしくお願いします。

LiveSketchScript.cs
1namespace OpenCvSharp.Demo
2{
3	using UnityEngine;
4	using OpenCvSharp;
5    using Aruco;
6
7    public class LiveSketchScript : WebCamera
8	{
9        MarkerTracking mt;
10		protected override void Awake()
11		{
12			base.Awake();
13			this.forceFrontalCamera = true;
14		}
15
16		// Our sketch generation function
17		protected override bool ProcessTexture(WebCamTexture input, ref Texture2D output)
18		{
19         
20            // Create default parameres for detection
21            DetectorParameters detectorParameters = DetectorParameters.Create();
22
23            // Dictionary holds set of all available markers
24            Dictionary dictionary = CvAruco.GetPredefinedDictionary(PredefinedDictionaryName.Dict6X6_250);
25
26            // Variables to hold results
27            Point2f[][] corners;
28            int[] ids;
29            Point2f[][] rejectedImgPoints;
30
31            // Create Opencv image from unity texture
32            Mat mat = Unity.TextureToMat(input);
33
34            // Convert image to grasyscale
35            Mat grayMat = new Mat();
36            Cv2.CvtColor(mat, grayMat, ColorConversionCodes.BGR2GRAY);
37
38            // Detect and draw markers
39            CvAruco.DetectMarkers(grayMat, dictionary, out corners, out ids, detectorParameters, out rejectedImgPoints);
40            CvAruco.DrawDetectedMarkers(mat, corners, ids);
41
42            mt.WStartp = corners;
43
44            output = Unity.MatToTexture(mat);
45
46
47            return true;
48		}
49	}
50}

MarkerTracking.cs
1using OpenCvSharp;
2using OpenCvSharp.Demo;
3using System.Collections;
4using System.Collections.Generic;
5using UnityEngine;
6
7public class MarkerTracking : MonoBehaviour
8{
9    LiveSketchScript LSS;
10    public Point2f[][] WStartp, WEndo, CStartp, CEndp;
11    //DefaultTrackableEventHandler DTE;
12    bool Count = false;
13    Vector3 WposST, WposED, CposST, CposED,Ccal;
14    float Dist;
15    // Start is called before the first frame update
16    void Start()
17    {
18        //DTE = this.gameObject.GetComponent<DefaultTrackableEventHandler>();
19    }
20
21    // Update is called once per frame
22    void Update()
23    {
24
25        Debug.Log(WStartp);
26        if (Input.GetKeyDown("return"))
27            {
28                Debug.Log(WStartp);
29                if (Count == false)
30                {
31                    //WposST = GameObject.Find("WorldMarker").transform.position;
32                    //CposST = this.gameObject.transform.position;
33
34                    Count = true;
35                }
36                else if(Count)
37                {
38                    Ccal = CposED - (WposED - WposST);
39                    Dist = Vector3.Distance(CposST, Ccal);
40                    Debug.Log(Dist);
41                    Count = false;
42                }
43            }
44            if(Count)
45            {
46                WposED = GameObject.Find("WorldMarker").transform.position;
47                CposED = this.gameObject.transform.position;
48            }
49    }
50}
51

NullReferenceException: Object reference not set to an instance of an object
OpenCvSharp.Demo.LiveSketchScript.ProcessTexture (UnityEngine.WebCamTexture input, UnityEngine.Texture2D& output) (at Assets/OpenCV+Unity/Demo/LiveSketch_WebCam/LiveSketchScript.cs:67)
OpenCvSharp.Demo.WebCamera.Update () (at Assets/OpenCV+Unity/Demo/Scripts/WebCamera.cs:145)