Real-Time Gradient-Domain Painting

Friday, September 19^th, 2008 from 12-1 pm in Wean 5409.

James McCann, CSD

We present an image editing program which allows artists to paint in the gradient domain with real-time feedback on megapixel-sized images. Along with a pedestrian, though powerful, gradient-painting brush and gradient-clone tool, we introduce an edge brush designed for edge selection and replay. These brushes, coupled with special blending modes, allow users to accomplish global lighting and contrast adjustments using only local image manipulations -- e.g. strengthening a given edge or removing a shadow boundary. Such operations would be tedious in a conventional intensity-based paint program and hard for users to get right in the gradient domain without real-time feedback. The core of our paint program is a simple-to-implement GPU multigrid method which allows integration of megapixel-sized full-color gradient fields at over 20 frames per second on modest hardware. By way of evaluation, we present example images produced with our program and characterize the iteration time and convergence rate of our integration method.

Fall 2008 Schedule

Aug 29	Wean 5409		AVAILABLE
Sep 5	Wean 5409		AVAILABLE
Sep 12	Wean 5409		AVAILABLE
Sep 19	Wean 5409	James McCann	Real-Time Gradient-Domain Painting
Sep 26	Wean 5409	Bryant Lee	Squigl: A game for detecting objects in images
Oct 3	Wean 5409		AVAILABLE
Oct 10	Wean 5409	Noam Zeilberger	Walking the way of duality (in programming)
Oct 17	Wean 5409	Dan Licata	TBD
Oct 24	Wean 5409		AVAILABLE
Oct 31	Wean 5409		AVAILABLE
Nov 7	Wean 5409		AVAILABLE
Nov 14	Wean 5409		AVAILABLE
Nov 21	Wean 5409		AVAILABLE
Nov 28	Wean 5409	Thanksgiving	UNAVAILABLE
Dec 5	Wean 5409		AVAILABLE
Dec 12	Wean 5409	Terrill L. Frantz	A Computational Theory of the Organizational Merger
Dec 19	Wean 5409	Black Friday	UNAVAILABLE

General Info

The Student Seminar Series is an informal research seminar by and for SCS graduate students from noon to 1 pm on Fridays. Lunch is provided by the Computer Science Department (personal thanks to Sharon Burks and Debbie Cavlovich!). At each meeting, a different student speaker will give an informal, 40 minute talk about his/her research, followed by questions/suggestions/brainstorming. We try to attract people with a diverse set of interests, and encourage speakers to present at a very general, accessible level.

So why are we doing this and why take part? In the best case scenario, this will lead to some interesting cross-disciplinary work among people in different fields and people may get some new ideas about their research. In the worst case scenario, a few people will practice their public speaking and the rest get together for a free lunch.

This page is updated roughly once a week, usually on Fridays.

Guideline & Speaking Requirement Need-to-Know

Note: Step #3 below is applicable to ALL SSS speakers.

SSS is an ideal forum for SCS students to give presentations that count toward fulfilling their speaking requirements. The specifics, though, vary with each department. For instance, students in CSD will need to be familiar with the notes on Sharon Burks' homepage and follow the instructions outlined on the Speakers Club home page. Roughly speaking, these are the steps:

1. Schedule a talk with SSS, first checking this page for available slots, then emailing sss@cs.
2. According to Speakers Club Procedure, fill out a request form for Speakers Club evaluator presence (need three) at least three weeks in advance of the talk date.
   (Provide Speakers Club with talk time/location obtained from this page.)
3. Send your talk title, abstract, additional info (like "Joint work with..." or "In Partial Fulfillment of the Speaking Requirement"), and a picture of yourself (preferably jpeg) to sss@cs, at the latest, TEN DAYS before your scheduled talk.
4. On the day of your talk, make sure you print Speakers Club evaluation forms for your evaluators to use.

Students outside of CSD will need to check with their respective departments regarding the procedure. As another example, ISRI students fulfill their speaking requirements by attending a semesterly Software Research Seminar and giving X number of presentations per school year. If you have experience with your department that might help others in your department, please feel free to contribute your knowledge by emailing us. Thank you!

SSS Tri-ordinators

Abhay Harpale, FoodCzar
Dafna Shahaf, PosterMaster
Ruy Ley-Wild, WebMaster