vision: init new branch, OH MY GOD IT WORKS

.gitignore

@@ -5,3 +5,5 @@
 *.obj.json
 *.npz
 *.npy
+*.jpg
+*.png

vision/main.py

@@ -0,0 +1,26 @@
+import argparse
+import cv2
+
+parser = argparse.ArgumentParser(description="Retrieves the contours of a printed part.")
+parser.add_argument('--current', '-c', dest='current', type=str, required=True, \
+                    metavar="current.png", help="An image of the current setup with the part on the print bed.")
+parser.add_argument('--background', '-b', dest='background', type=str, required=True, \
+                    metavar="background.png", help="An image of the background with no part on the print bed.")
+# TODO: these two should be required, but they aren't at this phase of testing
+#parser.add_argument('--layer', '-l', dest='layer', type=int, metavar='CURRENT LAYER', \
+#                    help="The current layer number, with respect to your layer height.")
+#parser.add_argument('contours', metavar='contours.npz', type=str, \
+#                    help="The contour data exported from the theoretical model.")
+
+if __name__ == "__main__":
+    args = parser.parse_args()
+
+    bg = cv2.imread(args.background)
+    fg = cv2.imread(args.current)
+
+    diff = cv2.cvtColor(cv2.absdiff(bg, fg), cv2.COLOR_BGR2GRAY)
+    ret, mask = cv2.threshold(diff, 0, 255, cv2.THRESH_BINARY_INV | cv2.THRESH_OTSU)
+
+    fg[mask != 255] = [0, 0, 255]
+
+    cv2.imwrite("temp.png", fg)