mjul · July 2, 2014 19:27 · Jul 2, 2014 · Jul 2, 2014
diff --git a/form.html → upload_form.html b/form.html → upload_form.html
diff --git a/form.html b/form.html
@@ -0,0 +1,4 @@
+  <form method="POST" enctype="multipart/form-data" action="/TARGET/URL/FOR/UPLOAD">
+    <input type="file" name="photo" />
+    <input type="submit" />
+  </form>
diff --git a/form_to_opencv.py b/form_to_opencv.py
@@ -0,0 +1,33 @@
+#
+#  Example from code built on the Flask web framework (and Werkzeug)
+#  Accepts uploading a photo file in the 'photo' form member, then
+#  copies it into a memory byte array and converts it to a numpy array
+#  which in turn can be decoded by OpenCV.
+#
+#  Beware that this increases the memory pressure and you should 
+#  configure a max request size before doing so.
+# 
+#  It saves a round-trip to a temporary file, though.
+
+import flask
+from flask import render_template, json, jsonify, request
+import numpy as np
+import cv2
+
+# ...
+
+# Remember to set a max content length 
+app = flask.Flask(__name__)
+app.config['MAX_CONTENT_LENGTH'] = 16 * 1024 * 1024 # 16 MB
+
+# ...
+
+# Here is the code to convert the post request to an OpenCV object
+
+    if request.method == 'POST' and 'photo' in request.files:
+        photo = request.files['photo']
+        in_memory_file = io.BytesIO()
+        photo.save(in_memory_file)
+        data = np.fromstring(in_memory_file.getvalue(), dtype=np.uint8)
+        color_image_flag = 1
+        img = cv2.imdecode(data, color_image_flag)
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