15-463, 15-663, 15-862
Computational Photography, Fall 2019
Time: Mondays, Wednesdays 12:00 PM - 1:20 PM
Location: GHC 5222
Instructor: Ioannis (Yannis) Gkioulekas
Teaching Assistant: Tiancheng Zhi
Course Description

Computational photography is the convergence of computer graphics, computer vision, optics and imaging. Its role is to overcome the limitations of traditional cameras, by combining imaging and computation to enable new and enhanced ways of capturing, representing, and interacting with the physical world.

This advanced undergraduate course provides a comprehensive overview of the state of the art in computational photography. At the start of the course, we will study modern image processing pipelines, including those encountered on mobile phone and DSLR cameras, and advanced image and video editing algorithms. Then we will continue to learn about the physical and computational aspects of tasks such as 3D scanning, coded photography, lightfield imaging, time-of-flight imaging, VR/AR displays, and computational light transport. Near the end of the course, we will discuss active research topics, such as creating cameras that capture video at the speed of light, cameras that look around walls, or cameras that can see below skin.

The course has a strong hands-on component, in the form of seven homework assignments and a final project. In the homework assignments, students will have the opportunity to implement many of the techniques covered in the class, by both acquiring their own images of indoor and outdoor scenes and developing the computational tools needed to extract information from them. Example homeworks include building end-to-end HDR imaging pipelines and structured light scanners. For their final projects, students will have the choice to use modern sensors and other optical instrumentation provided by the instructors (lightfield cameras, time-of-flight sensors, projectors, laser sources, and so on).

Cross-listing: This class is cross-listed as 15-463 (for undergraduate students), 15-663 (for Master's students), and 15-862 (for PhD students). Please make sure to register for the section of the class that matches your current enrollment status.

Prerequisites

This course requires familarity with linear algebra, calculus, programming, and doing computations with images. In particular, either of the following courses can serve as proof that you satisfy these prerequisites:

If you have not taken any of the above courses but want to enroll, please contact the instructor — exceptions will be made on a case-by-case basis. The course does not require prior experience with photography or imaging.

Textbook

Readings will be assigned primarily from relevant papers. Readings will be posted at the last slide of each lecture.

Additionally readings may be assigned from the following textbooks, which can also be useful references in general. All of them are available online from the CMU library:

Evaluation

Your final grade will be made up of:

Homework assignments: All homework assignments will have a programming component and a photography component, where students will use a DSLR camera to capture and process their own images. The programming component of all assignments be done in Matlab. The first assignment will serve as a short tutorial in Matlab and DSLR cameras. We have collected a few useful Matlab resources here.

Bonus homework assignment: There will be a seventh optional homework assignment that can be used to make up for lost credit.

Late days: For the homework assignments, students will be allowed a total of five free late days. Any additional late days will each incur a 10% penalty.

Collaboration policy: Students are encouraged to work in groups but each student must submit their own work. This includes: writing your own code, building your own imaging setups, taking your own photographs, and producing your own writeup. If you work as a group, include the names of your collaborators in your writeup. You absolutely should not share or copy code. Additionally, you should not use any external code unless explicitly permitted. Plagiarism is strongly prohibited and will lead to failure of this course.

Submitting homeworks: We will use Canvas for submitting and grading homeworks.

Final project: Details about the final project are available here.

15-663, 15-862: Students taking 15-663 or 15-862 will be required to do a more substantial final project, as well as submit a longer paper describing their project.

Cameras

Students are encouraged to obtain a digital camera for use in the course — any digital camera with manual controls should work. However, this is not a requirement, and about 20 cameras will be provided by the instructors for students who do not have one.

Email, Office Hours, and Discussion

Email: Please use [15463] in the title when emailing the teaching staff!

Office hours: Teaching staff have regular office hours at the following times.

Feel free to email us about scheduling additional office hours.

Discussion: We will use Piazza for class discussion and announcements.

Interested in research?

We are actively looking for students at all levels (undergraduates, MS, PhD) to help in projects on various aspects of computational photography, imaging, rendering, and graphics in general. If you are interested, please send Yannis an email (or talk to him in person in class).

You should also take a look at the imaging group website, to find more information about related projects active here at CMU.

Finally, you are welcome to attend the imaging group meetings, every Friday, 3:00 - 4:00 PM, at WEH 5421. If you want to receive announcements about the group meetings, as well as other emails regarding photography and imaging research, ask Yannis to add you to the imaging group's mailing list.

(Tentative) Syllabus

Slides will be updated on this website after each lecture.

DateTopicsSlidesAssignments
M, Aug 26Introductionpdf, pptx
W, Aug 28Digital photography pipelinepdf, pptx
F, Aug 30HW1 out
M, Sep 2No class (Labor day)
W, Sep 4Pinholes and lensespdf, pptx
M, Sep 9Photographic optics and aberrationspdf, pptx
W, Sep 11Exposure and high-dynamic-range imagingpdf, pptx
F, Sep 13HW1 due, HW2 out
M, Sep 16Noise modeling and calibrationpdf, pptx
W, Sep 18Colorpdf, pptx
M, Sep 23Bilateral and edge-aware filteringpdf, pptx
W, Sep 25Gradient-domain image processingpdf, pptx
F, Sep 27HW2 due, HW3 out
M, Sep 30Focal stacks and lighfieldspdf, pptx
W, Oct 2Focal stacks and lightfields (continued)pdf, pptx
M, Oct 7Deconvoluionpdf, pptx
W, Oct 9Coded photographypdf, pptx
F, Oct 11HW3 due, HW4 out
M, Oct 14Geometric camera models and calibrationpdf, pptx
W, Oct 16No class
M, Oct 21Radiometry and reflectancepdf, pptx
W, Oct 23Photometric stereopdf, pptx
F, Oct 25HW4 due
M, Oct 28Two-view geometrypdf, pptx
W, Oct 30Stereo and structured lightpdf, pptxHW5 out
M, Nov 4Global illuminationpdf, pptx
W, Nov 6Guest lecture: Aswin Sankaranarayanan
M, Nov 11Computational light transportpdf, pptx
W, Nov 13Time-of-flight imagingpdf, pptxHW5 due
M, Nov 18Fourier Opticspdf, pptxHW6 out
W, Nov 20Non-line-of-sight imaging
M, Nov 25Special topics
W, Nov 27No class (Thanksgiving)
M, Dec 2Special topicsHW7 out
W, Dec 4Special topics
F, Dec 6HW6 due, HW7 due
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Special Thanks

These lecture notes have been pieced together from many different people and places. Special thanks TBD.