AIRWiki - User contributions [en]

File:Documentazione.pdf

2008-09-19T17:04:01Z

AlessioBonsignore: uploaded a new version of "Image:Documentazione.pdf"

Image resize by solving a sparse linear system

2008-09-14T15:33:20Z

AlessioBonsignore: New page: == '''Part 1: project profile''' == === Project name === Content-aware Image Resize. === Project short description === This project presents a methodology for a two stages content awar...

== '''Part 1: project profile''' ==

=== Project name ===

Content-aware Image Resize.

=== Project short description ===

This project presents a methodology for a two stages content aware image resizing. The first stage computes the saliency matrix which will be used in the second stage to relocate all pixels in a smaller image size.

=== Dates ===
Start date: 2008/01/01

End date: 2008/09/06

=== People involved ===

===== Project head(s) =====

* [[User:PierluigiTaddei|Pierluigi Taddei]]
* Vincenzo Caglioti

===== Students currently working on the project =====

* Alessio C. Bonsignore

* Stefano Anelli

== '''Part 2: project description''' ==

==='''State of the art'''===

This project is based on the article ''Non-homogeneous Content-driven Video-retargeting, Lior Wolf, Moshe Guttmann, Daniel Cohen-Or
The School of Computer Science, Tel-Aviv University, 2007'', in which the author describes content aware video resize using a linear system to compute the mapping function.

==='''The problem'''===

The normal way of resizing a picture doesn’t take in account it’s content and differs from the resizing of a web page where each object is modified on the basis of its content. So, there is the need for an image resizing that is content aware.

==='''The Idea'''===

The idea behind content aware resizing is to treat in a different way the important regions of the image respect to those regions with less information. To achieve this goal it’s possible to analyze the source image building a saliency matrix based on gradient magnitude, features detection and eventually face detection (not included in the project). After that a sparce linear system is set up using several different constraits which force pixels to keep a proper position in a smaller size image. The system solution gives the new position of each pixel that better fit the image keeping as much information as possible from the source.

==='''The Project'''===

All these algorithms were implemented in Matlab and tested on several pictures (source code is available here: [[Media:progetto.zip|liquidResize source code]]
).

The project comprehend two versions of the liquidResize() function. One for both width and height resize, and the other only for width. Moreover, the first modifies the saliency matrix to take into account the features detected. The second insted does the same thing using more constraits in the linear system.

==='''Report'''===

The report about this project is available here: [[Media:Documentazione.pdf|Report]]

==='''Conclusion'''===

From results emerge that several image can be successfully resized as the one in the image below, but many situations are still troublesome. Straight lines for example will easily be bent. Moreover, if there's too much information in the image it will be resized uniformly just like a classic image resized techinque.

The main issue is the computational time. To get a 50% width resize of a small 300x225 image (as the kitty example) you need almost two minutes. And to resize both width and height you have to double that time.

[[Image:kitty.jpg|left|thumb|Mathlab screenshot of the final result |700px]]

Projects

2008-09-14T15:29:48Z

AlessioBonsignore: /* Computer Vision and Image Analysis */

''This page is a repository of links to the pages describing the '''projects''' we are currently working on at AIRLab.
See the list of our finished projects on the [[Finished Projects]] page.''

== Ongoing projects ==
''by research area (areas are defined in the [[Main Page]]); for each project a name and a link to its AIRWiki page is given''

==== [[Agents, Multiagent Systems, Agencies]] ====
----

* [[Multiagent cooperation|Multiagent cooperating system]]

* [[Planning in Ambient Intelligence scenarios| Planning in Ambient Intelligence scenarios]]

* [[Game theoretic analysis of electric power| Game theoretic analysis of electric power market]]

==== [[BioSignal Analysis]] ====
----
====== [[Affective Computing]] ======

* [[Relatioship between Cognition and Emotion in Rehabilitation Robotics]]
* [[Driving companions]]
* [[Emotion from Interaction]]
* [[Affective Devices]]

====== [[Brain-Computer Interface]] ======

* [[Online P300 and ErrP recognition with BCI2000]]
* [[BCI based on Motor Imagery]]
* [[Graphical user interface for an autonomous wheelchair]]
* [[Mu and beta rhythm-based BCI]]

====== [[Automatic Detection Of Sleep Stages]] ======

* [[Sleep Staging with HMM]]

====== [[Analysis of the Olfactory Signal]] ======

* [[Lung Cancer Detection by an Electronic Nose]]
* [[HE-KNOWS - An electronic nose]]

==== [[Computer Vision and Image Analysis]] ====
----

* [[Automated extraction of laser streaks and range profiles]]

* [[Data collection for mutual calibration|Data collection for laser-rangefinder and camera calibration]]

* [[Image retargeting by k-seam removal]]

* [[Particle filter for object tracking]]

* [[Template based paper like reconstruction when the edges are straight]]

* [[Wii Remote headtracking and active projector]]

* [[Vision module for the Milan Robocup Team]]

* [[Long Exposure Images for Resource-constrained video surveillance]]

* [[NonPhotorealistic rendering of speed lines]].

* [[Restoration of blurred objects using cues from the alpha matte]]

* [[Analyzing Traffic Speed From a Single Night Image - Light Streaks Detection]]

* [[Plate detection algorithm]]

* [[A vision-based 3D input device for space curves]]

* [[Correlation-based 3D reconstruction with pan/tilt stereo-camera]]

* [[Inverse scaling parametrization for Monocular Simultaneous Localization and Mapping]]

* [[Image resize by solving a sparse linear system]]

==== [[Machine Learning]] ====
----
* [[Adaptive Reinforcement Learning Multiagent Coordination in Real-Time Computer Games|Adaptive Reinforcement Learning Multiagent Coordination in Real-Time Computer Games]]

* [[B-Smart Behaviour Sequence Modeler and Recognition tool|B-Smart Behaviour Sequence Modeler and Recognition tool]]

* [[Player modeling in TORCS exploiting SVMs and GPUs parallelism|Player modeling in TORCS exploiting SVMs and GPUs parallelism]]

* [[Development an Artificial Intelligence System solving the MS Pac-Man videogame |Development an Artificial Intelligence System solving the MS Pac-Man videogame ]]

* [[Parameters optimization in TORCS exploiting genetic algorithms]]

* [[Neuroevolution in TORCS for evolving interesting and adaptive behaviors]]

==== [[Ontologies and Semantic Web]] ====
----
* [[Extending a wiki with semantic templates]]
* [[GeoOntology|Geographic ontology for a semantic wiki]]

==== [[Philosophy of Artificial Intelligence]] ====
----
==== [[Robotics]] ====
----
===== [[Robot development]] =====
* [[LURCH - The autonomous wheelchair]]

* [[Balancing robots: Tilty, TiltOne]]

* [[ Computer controlled Braking on the Alpaca Golf Cart ]]

* [[ Computer controlled Steering on the Alpaca Golf Cart ]]

===== [[Benchmarking]] =====

* [[Rawseeds|RAWSEEDS]]

===== [[Bio Robotics]] =====

* [[PoliManus]]

* [[ZOIDBERG - An autonomous bio-inspired RoboFish]]

* [[Styx The 6 Whegs Robot]]

* [[PolyGlove: a body-based haptic interface]]

* [[ULISSE]]

* [[PEKeB: a PiezoElectric KeyBoard]]

* [[Anthropomorphic Robotic Wrist]]

===== [[Robogames]] =====

* [[ROBOWII]]
----

== Note for students ==

If you are a student and there isn't a '''page describing your project''', this is because YOU have the task of creating it and populating it with (meaningful) content. If you are a student and there IS a page describing your project, you have the task to complete that page with (useful and comprehensive) information about your own contribution to the project. Be aware that the quality of your work (or lack of it) on the AIRWiki will be evaluated by the Teachers and will influence your grades.

Instructions to add a new project or to add content to an existing project page are available at [[Projects - HOWTO]].

File:Kitty.jpg

2008-09-14T15:24:12Z

AlessioBonsignore:

File:Documentazione.pdf

2008-09-14T15:20:13Z

AlessioBonsignore: