first commit

live_heatmap_diff_test.py

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+import numpy as np
+from typing import List
+import cv2
+
+class DiffSumHeatmap:
+    def __init__(self, capture):
+        self.diffs: List[np.array] = []
+        self.heatmap = np.array([])
+        self.cap = capture
+
+        # Fill up with first frame
+        ret, frame = self.cap.read()
+        self.lastframe = frame
+        self.lastsum = self.to_floats(self.to_grayscale(frame))
+
+    @staticmethod
+    def to_grayscale(frame):
+        return cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
+
+    @staticmethod
+    def to_floats(frame):
+        return cv2.normalize(frame, None, alpha=0, beta=1, norm_type=cv2.NORM_MINMAX, dtype=cv2.CV_32F)
+
+    @staticmethod
+    def float_to_gray(frame):
+        return cv2.normalize(frame, None, alpha=0, beta=255, norm_type=cv2.NORM_MINMAX, dtype=cv2.CV_8UC1)
+
+    @staticmethod
+    def gray_to_heat(frame):
+        return cv2.applyColorMap(frame, cv2.COLORMAP_JET)
+
+    def update(self):
+        ret, frame = self.cap.read()
+        self.diffs.append(
+            self.to_grayscale(
+                cv2.absdiff(self.lastframe, frame)
+            )
+        )
+        self.lastsum += self.diffs[-1]
+        self.heatmap = self.gray_to_heat(
+            self.float_to_gray(
+                self.to_floats(self.lastsum)
+            )
+        )
+        self.lastframe = frame
+
+cap = cv2.VideoCapture(0)
+diffsum = DiffSumHeatmap(cap)
+
+# Load diffsum up with first
+
+while(True):
+    # Update heatmap
+    diffsum.update()
+
+    # Display the resulting frame
+    cv2.imshow('frame', diffsum.heatmap)
+    if cv2.waitKey(1) & 0xFF == ord('q'):
+        break
+
+# When everything done, release the capture
+diffsum.cap.release()
+cv2.destroyAllWindows()\