diff --git a/src/gui/__init__.py b/src/gui/__init__.py
--- a/src/gui/__init__.py
+++ b/src/gui/__init__.py
@@ -3,6 +3,7 @@ import threading
 import tkinter as tk
 
 import config
+from analyzer import ImageAnalyzer
 from .mainwindow import MainWindow
 from .boardview import BoardView
 from .settings import Settings
@@ -19,6 +20,9 @@ class GUI:
 		self.root.title("OneEye {0}.{1}.{2}".format(*config.misc.version))
 		self.root.option_add('*tearOff',False) # for menu
 
+		self.detector=ImageAnalyzer()
+		self._frameKey=0
+
 		self._ownMessages=None
 		self._coreMessages=None
 
@@ -61,6 +65,10 @@ class GUI:
 		if self.settings:
 			self.settings.destroy()
 			self.settings=None
+		self.sendParams()
+
+	def sendParams(self):
+		self.sendMsg("setParams",(self.detector.params.copy(),))
 
 	def _handleEvent(self,e):
 		actions={
@@ -72,10 +80,11 @@ class GUI:
 
 		return actions[actionName](*args,**kwargs)
 
-	def _frameHandler(self,newFrame,type):
-		if self._state!=type:
+	def _frameHandler(self,newFrame,type,key):
+		if self._state!=type and self.mainWindow.imgView.isSet():
 			log.info("ignored setCurrentFrame event, wrong type")
 			return
+		self._frameKey=key
 		self.mainWindow.setCurrentFrame(newFrame)
 		self.root.event_generate("<<redrawImgView>>")
 
@@ -83,11 +92,12 @@ class GUI:
 		labels={(row,col):(i+1) for (i,(c,row,col)) in enumerate(moves)}
 		self.mainWindow.boardView.redrawState(gameState,labels)
 
-	def _paramsHandler(self,**params):
+	def _paramsHandler(self,params):
 		if not self.settings:
 			log.warning("received 'setParams' message while settings is '%s'",str(self.settings))
 			return
-		self.settings.setParams(**params)
+		self.detector.setParams(params)
+		self.settings.setParams(params)
 
 
 gui=GUI()