diff --git a/src/core.py b/src/core.py
--- a/src/core.py
+++ b/src/core.py
@@ -1,4 +1,6 @@
+import os
 import multiprocessing
+import threading
 import logging as log
 import PIL
 from util import MsgQueue
@@ -18,7 +20,8 @@ class Core:
 		self._ownMessages=MsgQueue(self._handleEvent)
 		self._guiMessages=MsgQueue()
 
-		self._frame=PIL.Image.open("../images/7.jpg")
+		imgPath=os.path.join(os.path.dirname(__file__), "..","images","7.jpg")
+		self._frame=PIL.Image.open(imgPath)
 
 		self._guiProc=multiprocessing.Process(name="gui", target=gui, args=(self._guiMessages,self._ownMessages))
 		self._guiProc.start()
@@ -36,7 +39,12 @@ class Core:
 			self._guiMessages.send("setGameState",(self.detector.board,))
 
 	def listen(self):
-		self._ownMessages.listen()
+		listenerThread=threading.Thread(target=lambda: self._ownMessages.listen())
+		listenerThread.start()
+
+	def joinGui(self):
+		self._guiProc.join()
+		self._ownMessages.send("kill")
 
 	def _handleEvent(self,e):
 		actions={"setCorners":self.setCorners, "setTresholds":self.setTresholds}
@@ -46,6 +54,7 @@ class Core:
 
 core=Core()
 core.listen()
+core.joinGui()
 
 """
 core