Latest revision as of 12:10, 18 December 2019

Click here to comment see PlayChessWithAWebCam

State transitions

Relevant Source parts

class ImageChange:
...
def isStable(self):
        delta=abs(self.movingAverage.gradient())
        stable=delta<ImageChange.gradientDelta
        if stable:
            self.stableCounter+=1
        else:
            self.stableCounter=0    
        return stable  
...
class SimpleDetector:
def updateState(self,cbImageSet):
        calibrationWindow=5
        
        ic=self.imageChange
        ics=ic.changeState
        if ics==ChangeState.CALIBRATING:
            # leave calibrating when enough stable values are available
            if ic.isStable() and ic.stableCounter>=calibrationWindow:
                ic.changeState=ChangeState.PRE_MOVE
        elif ics==ChangeState.PRE_MOVE:
            if not ic.isStable():
                ic.changeState=ChangeState.IN_MOVE
                ic.minInMove=ic.pixelChanges
                ic.maxInMove=ic.pixelChanges
        elif ics==ChangeState.IN_MOVE:
            ic.maxInMove=max(ic.maxInMove,ic.pixelChanges)
            peak=ic.maxInMove-ic.minInMove
            dist=ic.pixelChanges-ic.minInMove
            if peak>0:
                relativePeak=dist/peak
                if ic.isStable():
                    if relativePeak<0.1:
                        self.onMoveDetected(cbImageSet)

@@ Line 1: / Line 1: @@
-= Second attempt =
+{{:PlayChessWithAWebCam/Links}}
+= State transitions =
 <graphviz>
    digraph detection2 {
-     calibrating -> calibrating [ label="gradient < gradientDelta" ]
+     calibrating -> calibrating [ label="not stable or less than calibrationWindow times calibrating" ]
-     calibrating -> preMove [ label="" ]
+     calibrating -> preMove [ label="stable and more than calibrationWindows times calibrating" ]
-     preMove -> preMove
+     preMove -> preMove [ label="stable" ]
-     preMove -> inMove [ label="" ]
+     preMove -> inMove [ label="not stable" ]
-     inMove->inMove
+     inMove->inMove  [ label="not stable or difference of pixelChanges>10% of peak inMove value" ]
-     inMove -> potentialMove [ label="" ]
+     inMove -> potentialMove [ label="stable and difference of pixelChanges<10% of peak inMove value" ]
    }
 </graphviz>
-= First attempt =
+= Relevant Source parts =
-<graphviz>
+<source lang='python'>
-  digraph detection1 {
+class ImageChange:
-    calibrating -> valid [ label="more than calibrationWindow value" ]
+...
-    valid -> validStable [ label="more than validWindow valid values" ]
+def isStable(self):
-    validStable -> invalid [ label="value out of valid range" ]
+        delta=abs(self.movingAverage.gradient())
-    invalid -> invalidStable  [ label="value out of valid range for more than invalidWindow values" ]
+        stable=delta<ImageChange.gradientDelta
-    invalidStable -> potentialMove [ label="value in valid range" ]
+        if stable:
-    potentialMove -> invalidStable [ label="value out of valid range" ]
+            self.stableCounter+=1
-    potentialMove -> valid [ label="value in valid range - move detected?" ]
+        else:
+            self.stableCounter=0
-  }
+        return stable
-</graphviz>
+...
+class SimpleDetector:
+def updateState(self,cbImageSet):
+        calibrationWindow=5
+        ic=self.imageChange
+        ics=ic.changeState
+        if ics==ChangeState.CALIBRATING:
+            # leave calibrating when enough stable values are available
+            if ic.isStable() and ic.stableCounter>=calibrationWindow:
+                ic.changeState=ChangeState.PRE_MOVE
+        elif ics==ChangeState.PRE_MOVE:
+            if not ic.isStable():
+                ic.changeState=ChangeState.IN_MOVE
+                ic.minInMove=ic.pixelChanges
+                ic.maxInMove=ic.pixelChanges
+        elif ics==ChangeState.IN_MOVE:
+            ic.maxInMove=max(ic.maxInMove,ic.pixelChanges)
+            peak=ic.maxInMove-ic.minInMove
+            dist=ic.pixelChanges-ic.minInMove
+            if peak>0:
+                relativePeak=dist/peak
+                if ic.isStable():
+                    if relativePeak<0.1:
+                        self.onMoveDetected(cbImageSet)
+</source>

Difference between revisions of "PlayChessWithAWebCam/DetectState"

Latest revision as of 12:10, 18 December 2019

State transitions

Relevant Source parts

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