Qtqr doesn't decode a QRcode

[c3d]

Description: Ubuntu 14.04.2 LTS
Release: 14.04

qtqr:
  Installé : 1.4~bzr16-1ubuntu1
  Candidat : 1.4~bzr16-1ubuntu1
 Table de version :
 *** 1.4~bzr16-1ubuntu1 0
        500 http://tw.archive.ubuntu.com/ubuntu/ trusty/universe i386 Packages
        100 /var/lib/dpkg/status

I was trying to decode a qrcode with my netbook camera. I had the image, the recognition with the green square around the qrcode but then nothing happened

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: qtqr 1.4~bzr16-1ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-52.86-generic 3.13.11-ckt18
Uname: Linux 3.13.0-52-generic i686
ApportVersion: 2.14.1-0ubuntu3.10
Architecture: i386
CurrentDesktop: Unity
Date: Thu May 14 15:25:32 2015
InstallationDate: Installed on 2015-01-13 (120 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release i386 (20140722.2)
PackageArchitecture: all
SourcePackage: qr-tools
UpgradeStatus: No upgrade log present (probably fresh install)