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Question by alpertungakin · Dec 25, 2020 at 01:40 PM · c#androidcamerapermissions

Could not open the camera with EmguCV 4.x on Android.

Hello everyone,

I am trying to use the phone camera via EmguCV. Everything works fine in the editor but doesn't work after building. Here is my script:

   using UnityEngine;
   using UnityEngine.UI;
   using Emgu.CV;
   using Emgu.CV.Structure;
   using Emgu.CV.Features2D;
   using Emgu.CV.UI;
   using Emgu.CV.Util;
   using System;
   using System.IO;
   using System.Collections;
   using UnityEngine.Android;


   public class cam1 : MonoBehaviour {

 private int frameWidth;
 private int frameHeight;
 private VideoCapture cvCapture;
 private Image<Bgr, byte> currentFrame;
 public Texture2D tex;
 public RawImage mRawImage;

 GameObject dialog = null;

 void Start () {
     #if PLATFORM_ANDROID
     if (!Permission.HasUserAuthorizedPermission(Permission.Camera)){
         Permission.RequestUserPermission(Permission.Camera);
     }
     #endif
     cvCapture = new VideoCapture();
     cvCapture.FlipHorizontal = true;
     frameWidth = (int) cvCapture.GetCaptureProperty (Emgu.CV.CvEnum.CapProp.FrameWidth);
     frameHeight = (int) cvCapture.GetCaptureProperty (Emgu.CV.CvEnum.CapProp.FrameHeight);

 }
     
 void Update () {
     var frame = cvCapture.QueryFrame().ToImage<Bgr, byte>();
     MemoryStream _memory = new MemoryStream ();
     frame.Bitmap.Save(_memory, frame.Bitmap.RawFormat);
     tex = new Texture2D (frameWidth, frameHeight, TextureFormat.RGB24, false);
     gameObject.GetComponent<RawImage> ().rectTransform.sizeDelta = new Vector2 (frameWidth, frameHeight);
     tex.LoadImage (_memory.ToArray ());
     tex.Apply ();
     gameObject.GetComponent<RawImage>().texture = tex;
 }

     }

I'm using Unity 2018.4.30f1 and EmguCV 4.x. Thanks for your help.

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