Translation and gif

README.md

@@ -1,4 +1,18 @@
 # conta-bolas
 Python OpenCV juggling balls counter
 
+![](juggling.gif)
+
 Uses Python2 and Debian's python-opencv 2.4.9.1 package
+
+It was inspired by a [tweet](https://twitter.com/nedbat/status/682632559310860289) and a [blog post](http://nedbatchelder.com/blog/201512/flip_turns_and_five_balls.html) from Ned Batchelder.
+
+Right now, it only counts how many times a red object crosses a green line going up.
+
+My goal is to make an interactive juggling game that will encourage people to try juggling.
+
+Would you help me? Contribute with pull requests!
+
+Vídeo: https://youtu.be/95rSO4VFfr8
+
+gif: http://makeagif.com/i/PdSEaP

count_throws.py

@@ -0,0 +1,88 @@
+#! /usr/bin/env python2
+# -*- coding: utf-8 -*-
+
+import cv2
+import numpy as np
+import time
+
+mirror_mode = True  # flips horizontally
+
+# key pressed (used to escape screen and close)
+key = 0
+
+# read stream from a webcam
+capture = cv2.VideoCapture(0)
+
+# throws count
+counting = 0
+
+# green line
+line_height = 240
+
+visible = False  # is the ball in view?
+below = False    # under the line?
+over = False     # or over it?
+
+# moment of the last counting
+last_time = time.time()
+
+while key != 27 and key != 1048603:  # ESC key
+    _, im = capture.read()
+
+    if mirror_mode:
+        cv2.flip(im, 1, im)
+
+    # BGR
+    min_target_color = np.array([0, 0, 80])
+    max_target_color = np.array([30, 30, 255])
+
+    # filters out what is not red
+    mask = cv2.inRange(im, min_target_color, max_target_color)
+
+    # contours all the red objects found
+    contours, _ = cv2.findContours(mask,
+                                   cv2.RETR_TREE,
+                                   cv2.CHAIN_APPROX_SIMPLE)
+
+    # draws green line
+    cv2.line(im,
+             (0, line_height), (800, line_height),
+             (0, 255, 0),  # green
+             thickness=3)
+
+    # rectangles
+    for contour in contours:
+        if cv2.contourArea(contour) > 200:  # only larger objects
+            visible = True
+            ret_x, ret_y, ret_w, ret_h = cv2.boundingRect(contour)
+            cv2.rectangle(im, (ret_x, ret_y),
+                              (ret_x+ret_w,
+                               ret_y+ret_h),
+                              (0, 255, 255), 2)
+
+    # where's the ball
+    if visible:
+        if ret_y < line_height:
+            over = True
+        else:
+            below = True
+            over = False
+
+    # counts
+    if over and below:
+        if time.time() - last_time > 4:  # 4 seconds to reset
+            counting = 0
+        counting += 1
+        last_time = time.time()
+        over = False
+        below = False
+
+    # shows counting
+    cv2.putText(im,
+                '%02d' % counting,
+                (500, 70),
+                cv2.FONT_HERSHEY_TRIPLEX, 3, (255, 0, 0))
+
+    cv2.imshow('Result', im)
+
+    key = cv2.waitKey(10)