improved handWidth detection

bbiwarg/Parameters.cs

@@ -107,6 +107,7 @@ namespace bbiwarg
         public static readonly float HandmYY = 0.0005f;
 
         // palm detection
+        public static readonly int PalmNumPositionsForHandWidth = 5;
 
         // palm tracker
         public static readonly int PalmTrackerNumFramesDetectedUntilTracked = 5;

bbiwarg/Recognition/PalmRecognition/PalmDetector.cs

@@ -42,16 +42,6 @@ namespace bbiwarg.Recognition.PalmRecognition
             foreach (Hand palmHand in palmHands)
             {
                 ConvexityDefect thumbDefect = palmHand.ThumbDefect;
-                /*
-                Vector2D handLength = 1.5f * thumbDefect.VectorLong;
-                Vector2D handWidth = 0.45f * handLength.getOrthogonal(palmHand.Side == HandSide.Right);
-
-                Vector2D fingersUpperOld = thumbDefect.Inner + 0.8f * handLength;
-                Vector2D wristUpperOld = thumbDefect.Inner - 0.2f * handLength;
-                Vector2D wristLowerOld = wristUpperOld + handWidth;
-                Vector2D fingersLowerOld = wristLowerOld + 0.75f * handLength - 0.3f * handWidth;
-                */
-
                 Vector2D directionWristFinger = thumbDefect.VectorLong.normalize();
                 Vector2D directionFingerWrist = directionWristFinger.getInverse();
                 Vector2D directionUpperLower = directionWristFinger.getOrthogonal(palmHand.Side == HandSide.Right);
@@ -59,7 +49,7 @@ namespace bbiwarg.Recognition.PalmRecognition
 
                 //handLength
                 Vector2D handLength = 1.5f * thumbDefect.VectorLong;
-                
+
                 //fingersUpper
                 Vector2D fingersUpper = thumbDefect.OuterLong;
                 bool handBelow = true;
@@ -68,7 +58,7 @@ namespace bbiwarg.Recognition.PalmRecognition
                     fingersUpper += directionWristFinger;
                     Vector2D below = fingersUpper.copy();
                     bool handBelowFound = false;
-                    while (!handBelowFound && below.getDistanceTo(fingersUpper) < 2*Parameters.FingerMaxWidth && below.isInBound())
+                    while (!handBelowFound && below.getDistanceTo(fingersUpper) < 2 * Parameters.FingerMaxWidth && below.isInBound())
                     {
                         below += directionUpperLower;
                         handBelowFound = palmHand.isInside(below);
@@ -77,15 +67,12 @@ namespace bbiwarg.Recognition.PalmRecognition
                 }
 
                 //wristUpper
-                Vector2D wristUpper = thumbDefect.Inner + 5*directionFingerWrist;
+                Vector2D wristUpper = thumbDefect.Inner + 5 * directionFingerWrist;
                 while (wristUpper.isInBound() && palmHand.isInside(wristUpper))
                     wristUpper += directionFingerWrist;
 
                 //handWidth
-                Vector2D lower = thumbDefect.Inner + 10 * directionUpperLower;
-                while (lower.isInBound() && palmHand.isInside(lower))
-                    lower += directionUpperLower;
-                Vector2D handWidth = (lower - thumbDefect.Inner);
+                Vector2D handWidth = getHandWidth(palmHand, directionUpperLower);
 
                 //wristLower
                 Vector2D wristLower = wristUpper + handWidth;
@@ -100,5 +87,32 @@ namespace bbiwarg.Recognition.PalmRecognition
 
             }
         }
+
+        private Vector2D getHandWidth(Hand palmHand, Vector2D directionUpperLower)
+        {
+            Vector2D lineStart = palmHand.ThumbDefect.Inner;
+            Vector2D lineEnd = palmHand.ThumbDefect.OuterLong;
+            Vector2D step = (lineEnd - lineStart) / Parameters.PalmNumPositionsForHandWidth;
+            Vector2D currentStart = lineStart;
+
+            Vector2D maxWidth = null;
+            float maxWidthLength = float.MinValue;
+
+            for (int i = 0; i < Parameters.PalmNumPositionsForHandWidth; i++)
+            {
+                Vector2D lower = currentStart + 10 * directionUpperLower;
+                while (lower.isInBound() && palmHand.isInside(lower))
+                    lower += directionUpperLower;
+                Vector2D width = (lower - currentStart);
+                float length = width.Length;
+                if (length > maxWidthLength)
+                {
+                    maxWidth = width;
+                    maxWidthLength = length;
+                }
+                currentStart += step;
+            }
+            return maxWidth;
+        }
     }
 }