diff --git a/src/core.py b/src/core.py
--- a/src/core.py
+++ b/src/core.py
@@ -41,7 +41,7 @@ class Core:
 	def setTresholds(self,tresB=None,tresW=None):
 		if tresB is not None: self.detector.tresB=tresB
 		if tresW is not None: self.detector.tresW=tresW
-		self.analyze()
+		self.preview()
 
 	def relativeFrame(self,step):
 		self._imgIndex=(self._imgIndex+step)%len(self._imgs)
@@ -50,6 +50,17 @@ class Core:
 		self._guiMessages.send("setCurrentFrame",(self._frame.copy(),gui.PREVIEW))
 		self.preview()
 
+	def sendParams(self):
+		params={
+			"tresB": self.detector.tresB,
+			"tresW": self.detector.tresW
+		}
+		self._guiMessages.send("setParams",tuple(),params)
+
+	def setParams(self,tresB=0,tresW=0):
+		self.detector.tresB=tresB
+		self.detector.tresW=tresW
+
 	def preview(self):
 		if self.detector.analyze(self._frame):
 			self._guiMessages.send("setGameState", (self.detector.board,[]))
@@ -83,7 +94,9 @@ class Core:
 			"setCorners": self.setCorners,
 			"setTresholds": self.setTresholds,
 			"prevFrame": lambda: self.relativeFrame(-1),
-			"nextFrame": lambda: self.relativeFrame(1)
+			"nextFrame": lambda: self.relativeFrame(1),
+			"fetchParams": self.sendParams,
+			"setParams": self.setParams
 		}
 		(actionName,args,kwargs)=e