diff --git a/src/core.py b/src/core.py
--- a/src/core.py
+++ b/src/core.py
@@ -1,4 +1,3 @@
-import os
 import multiprocessing
 import threading
 import logging
@@ -27,10 +26,7 @@ class Core:
 		self._guiMessages=MsgQueue()
 		self._vidMessages=MsgQueue()
 
-		self._imgs=sorted(os.listdir(cfg.misc.imgDir))
-		self._imgIndex=cfg.misc.defaultImage
-		imgPath=os.path.join(cfg.misc.imgDir,self._imgs[self._imgIndex])
-		self._frame=PIL.Image.open(imgPath)
+		self._frame=None
 
 		self._guiProc=multiprocessing.Process(name="gui", target=gui, args=(self._guiMessages,self._ownMessages))
 		self._guiProc.start()
@@ -41,42 +37,23 @@ class Core:
 		)
 		self._vidProc.start()
 
-	def setCorners(self,corners):
-		self.detector.setGridCorners(corners)
-		self.analyze()
-
-	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.preview()
-
-	def relativeFrame(self,step):
-		self._imgIndex=(self._imgIndex+step)%len(self._imgs)
-		imgPath=os.path.join(cfg.misc.imgDir,self._imgs[self._imgIndex])
-		self._frame=PIL.Image.open(imgPath)
-		self._guiMessages.send("setCurrentFrame",(self._frame.copy(),gui.PREVIEW))
-		self.preview()
+	def showFrame(self,key):
+		frame=self._cache.get(key)
+		if frame is None:
+			(key,frame)=self._cache.getRelative(10)
+		self._guiMessages.send("setCurrentFrame", (frame.copy(), gui.PREVIEW, key))
 
 	def putFrame(self,frame):
-		img=PIL.Image.fromarray(frame)
-		self._cache.put(img)
-		self._guiMessages.send("setCurrentFrame",(img,gui.PREVIEW)) # !! RECORDING
-		# self.analyze()
+		self._frame=PIL.Image.fromarray(frame)
+		k=self._cache.put(self._frame)
+		self._guiMessages.send("setCurrentFrame", (self._frame, gui.RECORDING, k))
+		self.analyze()
 
 	def sendParams(self):
-		params={
-			"tresB": self.detector.tresB,
-			"tresW": self.detector.tresW
-		}
-		self._guiMessages.send("setParams",tuple(),params)
+		self._guiMessages.send("setParams",(self.detector.params.copy(),))
 
-	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,[]))
+	def setParams(self,params):
+		self.detector.setParams(params)
 
 	def analyze(self):
 		if self.detector.analyze(self._frame):
@@ -105,8 +82,6 @@ class Core:
 
 	def _handleEvent(self,e):
 		actions={
-			"setCorners": self.setCorners,
-			"setTresholds": self.setTresholds,
 			"prevFrame": lambda: self.relativeFrame(-1),
 			"nextFrame": lambda: self.relativeFrame(1),
 			"putFrame": self.putFrame,