c# code to capture image from unity

sendImageServer.cs

    IEnumerator TakePhoto(string type)  // Start this Coroutine on some button click
    {
    // NOTE - you almost certainly have to do this here:

     yield return new WaitForEndOfFrame(); 

        Texture2D tex = new Texture2D(Screen.width, Screen.height,TextureFormat.RGB24, false);
        tex.ReadPixels(new Rect(0, 0, Screen.width, Screen.height), 0, 0);
        tex.Apply();

        //Encode to a PNG
        byte[] bytes = tex.EncodeToPNG();
        WWWForm form = new WWWForm();
        //form.AddField("frameCount", Time.frameCount.ToString());
        // form.AddField("Width",Screen.width);
        form.AddField("Type",type);
        form.AddField("x",bboxX);
        form.AddField("y",bboxY);
        form.AddField("width",widthTarget);
        form.AddField("height",heightTarget);
        form.AddBinaryData("file", bytes);
        print("sending picture");
        // Upload to a cgi script
        var w = UnityWebRequest.Post("http://SERVERP:PORT", form);
        yield return w.SendWebRequest();
        if (w.isNetworkError || w.isHttpError)
            print(w.error);
        else {
            string response = w.downloadHandler.text;
            if (response[0] == '1'){
                sideCaptured = true;
            }
            if (response[1] == '1'){
                frontCaptured = true;
            }
        }
        yield return null;
        // send to server
    }