Image Collection Backend for
Cameraphones
Introduction
Project Goals
Design an integrated system to upload image from
a mobile phone to a remote server
Sort and categorize the images on the server
Introduction
Why?
Cameras on mobile phones becoming much better
~5MP
Flash
No simple way to organize and store images taken
System Components
System Components
Client Application
Connects to phone
Downloads new images
Uploads images to server
“Remembers” what images have been uploaded
System Components
Server Application
Receives & saves images from the client
Provides a basic workflow engine
Extracts information from the image
Implements a number of methods of
sorting/searching
Provides a user interface to the system
Client Application
Python
ObexFTP (“FTP over Bluetooth”)
SQLite (Lightweight database engine)
Mechanize (Browser emulator)
Client Application
ObexFTP
Lists files on mobile phone
Downloads new images
Client Application
Uses the database to store
User credentials
Phone information
Image information
Client Application
Mechanize
Contacts and logs into server
Uploads images
Implementation
Server Software
Django (MVC Framework)
Each Photo is associated with a Gallery
Each Gallery is associated with a User
Each Photo may be associated with a number of Faces
Each Face will have a Person
Implementation
Database MySQL/PostgreSQL
SQLite
Server Application
OpenCV
Open source image processing library from Intel
Very high performance
Aimed towards computer vision
Used to detect faces in images
Server Application
Face Detection
Determines if the image is a portrait or group-shot
Crops a region of the image around the face
Allows people to be “tagged”
Server Application
Auto Colour Correlogram “A colour correlogram is a representation expressing the spatial
correlation of colour and distance between pixels in a stored
image.”
Used to search for a person in images
Based on the LIRE implementation
Server Application
Images are sorted by date uploaded
Exif metadata from images
Can find images taken at the same “event”
Web Interface
Written entirely in Django
Allows users to log in, view images and leave
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