mjul · July 2, 2014 19:27 · gachiemchiep · Jan 17, 2018 · paulatavares16 · Mar 26, 2018
diff --git a/form_to_opencv.py b/form_to_opencv.py
 #
 #  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)
diff --git a/upload_form.html b/upload_form.html
  <form method="POST" enctype="multipart/form-data" action="/TARGET/URL/FOR/UPLOAD">
    <input type="file" name="photo" />
    <input type="submit" />
  </form>
	#
	# 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)
	<form method="POST" enctype="multipart/form-data" action="/TARGET/URL/FOR/UPLOAD">
	<input type="file" name="photo" />
	<input type="submit" />
	</form>