fix accessing rarity value in lightness

Author: nicola-corbellini

pyeyesweb/analysis_primitives/rarity.py

@@ -7,7 +7,7 @@ class Rarity:
 
     def __call__(self, sliding_window: SlidingWindow, alpha: float = 0.5) -> dict:
         if not sliding_window.is_full():
-            return np.nan
+            return {"rarity": np.nan}
 
         samples, _ = sliding_window.to_array()
         n_samples = len(samples)

pyeyesweb/mid_level/lightness.py

@@ -35,9 +35,9 @@ def __call__(self, velocity, alpha: float = 0.5) -> dict:
 
         self.sliding_window.append([1.0 - weight_index])  # ora sliding_window contiene floats
 
-        lightness = self.rarity(self.sliding_window, alpha=alpha)  # Rarity riceve una sequenza di numeri
+        lightness = self.rarity(self.sliding_window, alpha=alpha)
 
-        return {"lightness": lightness}
+        return {"lightness": lightness.get("rarity", 0)}
 
     def _filter_signal(self, signal):
         if not self.use_filter: