Problem with capture image from web camera.

Hi, I am going to pass the image captured with my own plugin to unity. But I found that Texture2D.Apply() function is very slow. And the game runs only on 12-15 fps. Is there any possibility to walk around the Apply() function? May I pass the image to the VRAM directly?

Thanks in advance!

My code is as follow.

 using UnityEngine;

using System.Collections; using System.Runtime.InteropServices; using System.Threading;

public class WebCamera : MonoBehaviour {

 [DllImport("OpencvKinectGrabber.dll", EntryPoint = "InitSystem")]  
  public static extern void InitSystem();  
 
 [DllImport("OpencvKinectGrabber.dll", EntryPoint = "GetImage")]  
  public static extern bool GetImage(byte[] data);  
 
 [DllImport("OpencvKinectGrabber.dll", EntryPoint = "InitSystem")]  
  public static extern void EndSystem();  
 
 WebCamTexture webcamTex ;
 WebCamDevice[] devices;
 
 Texture2D cvTexture;
 
 Color32[] colors;
 
 byte[] data;
 
 Thread hThread;
 
 
 public RenderTexture renderTexture;
 
 bool quit = false;

 // Use this for initialization
 void Start () {
     
      /*
     devices = WebCamTexture.devices;
     webcamTex = new WebCamTexture(devices[1].name,640,480,30);
     print(devices[1].name);
     renderer.material.mainTexture = webcamTex;
     webcamTex.Play();
     */
     
     InitSystem();
     
     cvTexture = new Texture2D(640,480);
     colors = new Color32[640*480];
     data = new byte[640*480*4];
     
     renderer.material.mainTexture = cvTexture;
     
     hThread = new Thread(Loop);
     hThread.Start();
         
 }
 
 void Loop()
 {
     while(!quit)
     {
         bool result = GetImage(data);
 
         if(!result)
             return;
      
         for (int i=0;i<480;i++)  
         {  
             for (int j = 0;j<640;j++)  
             {  
                 colors[(i*640+j)].b = data[(i*640+j)*4+0];  
                 colors[(i*640+j)].g = data[(i*640+j)*4+1];  
                 colors[(i*640+j)].r = data[(i*640+j)*4+2];  
                 colors[(i*640+j)].a = 255;  
             }  
         } 
      
     
     }
     
 }
 
 
 // Update is called once per frame
 void Update () {

      cvTexture.SetPixels32(colors);
     cvTexture.Apply(false);
     
      
 }
 
 
 void OnApplicationQuit()
 {
     quit = true;
  
     EndSystem();
 }
 
 
     

}