Différences

Ci-dessous, les différences entre deux révisions de la page.

--- diy:projets:qrdeciphering [2018/05/23 09:30] – créée ycaminade
+++ diy:projets:qrdeciphering [2018/05/23 13:56] (Version actuelle) – [Required Libraries] ycaminade
@@ Ligne 1: / Ligne 1: @@
-===== Introduction =====
+====== Introduction ======
 The goal of this program is to detect and decipher one or several QR codes in a picture.
-===== Required Libraries =====
+====== Required Libraries ======
-In order to decipher QR codes, we will use the QRLight library, installed as follow:\\
+In order to decipher QR codes, we will use the zbarlight library, installed (on Debian) as follows:\\
 ''apt-get install libzbar0 libzbar-dev''\\
 ''pip install zbarlight''\\
@@ Ligne 30: / Ligne 30: @@
 </code>
-**Work in Progress...**
+If the right argument was given, we can remote into the pi to take a picture. To do so, we use subprocess.Popen() to run the following command with the given ip:\\
+''ssh -t pi@<ip> "raspistill -hf -vf -o <nom_fichier> --nopreview --timeout 10"''\\
+To avoid conflict with an already existing picture, we put the date and time in the new picture's name.
+<code python>
+ if (len(sys.argv) == 2 and isValidIPV4(sys.argv[1])):
+    filename = 'qrcodereader_' + datetime.datetime.now().strftime("%Y-%m-%d-%H:%M:%S") + '.jpg'
+    print("Taking picture...")
+    command = ['ssh', '-t', 'pi@' + sys.argv[1], "raspistill -hf -vf -o " + filename + " --nopreview --timeout 10"]
+    x = Popen(command, stdout=PIPE, stderr=PIPE)
+    stderr = x.stderr.read()
+    print stderr
+</code>
+We then import the resulting image over ssh using the ''rsync'' command.
+<code python>
+    print("Importing...")
+    command = ['rsync', '-avz', '--ignore-existing', '--remove-source-files', 'pi@' + sys.argv[1] + ':~/' + filename, '/home/silver/BE/' + filename]
+    x = Popen(command, stdout=PIPE, stderr=PIPE)
+    stderr = x.stderr.read()
+    print stderr
+</code>
+We now simply use zbarlight to decode any and all QR codes fully visible on the picture. We only need to open and load the image, before applying the scan_codes function.
+<code python>
+    file_path = './' + filename
+    with open(file_path, 'rb') as image_file:
+        image = Image.open(image_file)
+        image.load()
+    code = zbarlight.scan_codes('qrcode', image)
+    print('QR codes: %s' % code)
+</code>
+The program outputs a full list of all deciphered QR codes.