motion detection

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class TextureGen : MonoBehaviour
{
    [SerializeField] private Renderer _OutPutRenderer;

    [SerializeField] private Material _OutputMaterial;

    [SerializeField] private float _DetectMovement;

    private WebCamTexture _webCamTexture;
    private Texture2D _TargetTexture;
    private Color _Color;

    private void Start()
    {
        _webCamTexture = new WebCamTexture();
        _webCamTexture.Play();

        _TargetTexture = new Texture2D(_webCamTexture.width, _webCamTexture.height);

        _OutputMaterial.mainTexture = _TargetTexture;
    }

    private Color[] _PreviousFrame;
    private void Update()
    {
        Color[] _pixels = _webCamTexture.GetPixels();
        Color[] _output = new Color[_pixels.Length];

        if(_PreviousFrame != null)
        {


            int _totalmotion = 0;
            int _index = 0;
            for (int PixelY = 0; PixelY < _webCamTexture.height; PixelY++)
            {
                for (int PixelX = 0; PixelX < _webCamTexture.width; PixelX++)
                {
                    float _motion = Mathf.Abs(_pixels[_index].maxColorComponent - _PreviousFrame[_index].maxColorComponent);
                    _output[_index] = (_motion < _DetectMovement) ? _Color:Color.red;
                    if ((_motion > _DetectMovement)) _totalmotion++;
                    _index++;
                }
            }
            _TargetTexture.SetPixels(_output);
            _TargetTexture.Apply();
            int _totalPixels = _webCamTexture.width * _webCamTexture.height;
            print(_totalmotion * 100 / _totalPixels);
        }
        _PreviousFrame = _pixels;
    }
}