CS178 Assignment 2 - Sports and Action
Tony the labrador retriever thought the kite needed retrieving. Photo by Natasha Gelfand.
One of the first problems photographers hit is that the world doesn't stay still and wait for you to take your photo. Many interesting compositions are fleeting, and the photographer has to be somewhat opportunistic. Sometimes you have to expect to take a hundred photos and only get a handful of good ones. This week we'll be capturing moving things. There are tons of interesting moving things around campus: cyclists, people playing ultimate frisbee, cars driving past, squirrels dashing from tree to tree. Animals in general are delightfully uncooperative, so if you have a dog or cat, this might be a good week to take a photo of them running or jumping or chasing a toy.
The key difficulty in capturing moving objects is getting enough light. The shutter speed needs to be short to prevent motion blur. You usually compensate for this by using a large aperture and increasing ISO. However, this shortens the depth of field and makes precise focus more important. Autofocus takes time, and a slow autofocus system can result in a missed shot. If you're waiting for something to happen so you can take a picture of it, one good trick is to prefocus at the depth you're expecting, so that the photograph can be captured at the instant the interesting event occurs.
This assignment is similar in format to the first one, except that there are only four requirements this week. There are a small number of requirements for you to meet by taking photographs, uploading them as a new album to the Picasa account you made last week, and adding comments below them. You must hit each requirement in at least one photo, and every photo should hit at least one requirement. Upload from 5 to 10 photographs. See the example solution below for guidance.
Example SolutionWe've put up an example solution to this assignment to both let you know what we expect, and hopefully also inspire you to take better photos than the TAs can. You don't have to meet the assignment requirements in the same way as we did - surprise us!
One caveat: In our example solutions we may reuse photos we already had lying around, or borrow photos from other people to illustrate a point. Don't do this - your work for each assignment should be done by you specifically for the course.
If you have questions or comments about the photos we used in the example solution, feel free to add them as comments below the corresponding photograph in Picasa Web, or to email us.
It's hard to judge artistic quality, so rather than grading the individual photos, the TAs will assign grades based on whether you met the requirements of the assignment. For each requirement, you'll be given a check for meeting the requirement, check-minus for not quite meeting the requirement, or check-plus if you do something spectacular that makes your grader's jaw drop.
Due Date11:59PM, Sunday, April 12, 2009
Assignments are generally due on Sunday at midnight at the end of the week in which they're assigned. This leaves you free to start thinking about the next assignment during your next section. Sometimes lateness is unavoidable. Here's the lateness policy from the course outline:
© 2009 Marc Levoy and Andrew Adams