Famous Images in Computer Graphics Image Processing Srgio

Famous Images in Computer Graphics & Image Processing Sérgio Leal N. o 0230261 Erasmus student at: Institute for Computer Graphics and Vision Technical University of Graz 2002/2003 mcamara@sbox. TUGraz. at

Introduction n Stanford’s Bunny n Lena n The teapot

Why? n n n Why the same images are always used ? Which properties have this images that make them special ? Which properties should candidate images have ?

Stanford’s Bunny n n Created by Greg Turk and Marc Levoy. Developed to create polygonal models from several range scans.

Stanford’s Bunny n Original paper – "Zippered Polygon Meshes from Range Images" Greg Turk and Marc Levoy Siggraph 94, pp. 311 -318 On-line version of paper available

Why Stanford’s Bunny? Fairly smooth, n Has manifold connectivity, n Original was red and diffuse n Not complex (69, 451 triangles). n

Stanford’s Bunny Curiosities n n Chosen by chance at Easter time on a shop Made of terra cota Original still lives at Stanford No bottom

Lena or Lenna n n Widely used standard test images Used for compression algorithms Swedish woman named Lena Sjooblom Digitized from Playboy centerfold, from November 1972.

Lena or Lenna n n Digitized at the University of Southern California as one of many possible images for use by the research community. Other examples

Lena or Lenna n Unhappy people about the source n Some controversy n Degrading to women n Playboy’s copyrights

Why Lena? Shading, n Texture, n Flat regions, n Nice mixture of detail, n n n Good for testing various image processing algorithms. The Lena image is a picture of an attractive woman.

Lena curiosities Married and lives in south Stockholm n The image appeared in the movie Sleeper n Didn’t know how famous her picture was n

Lena curiosities n n Made her first public appearance in 1997 at the 50 th Annual Conference of the Society for Imaging Science in Technology Nowadays helps handicapped people work on (non-networked) computers

The teapot n Done by Martin Newell n Suggested by his wife n Due to lack of computer models n Also digitized a spoon and a cup and saucer.

The teapot n n The original teapot is about 30% taller Jim Blinn, to make the model conform to the pixel raster, squashed the model instead of scaling the image.

Why the teapot ? Instantly recognisable, n Complex topology, n Self-shadows, n Hidden surface, n Convex and concave surfaces n ‘Saddle points'. n Few storage space n

The teapot curiosities n The original is at Ephemera collection of the Computer History Museum

The teapot curiosities n n n The original teapot data has no bottom. Martin Newell at SIGGRAPH in middle 80 regretted that from all the work he had done, the only thing he will be remembered for is "That Damned Teapot". Rumours say that the early computer graphics pioneers could type the teapot by memory

Conclusion n n Usually chosen by chance After characteristic noticed Gain a sentimental value No special selection algorithm Keep trying new ones

References n University of Southern California image database: n n n Other images n n n n n Girl - http: //sipi. usc. edu/services/database. cgi? volume =misc&image=1#top Couple - http: //sipi. usc. edu/services/database. cgi? volume =misc&image=2#top House - http: //sipi. usc. edu/services/database. cgi? volume =misc&image=5#top Tree - http: //sipi. usc. edu/services/database. cgi? volume =misc&image=6#top Lena - http: //sipi. usc. edu/services/database. cgi? volume =misc&image=12#top Gold teapot - http: //www. okino. com/slidshow/teapotx 1. htm Original teapot - http: //www. sjbaker. org/teapot/ Rendered teapot - http: //www. sjbaker. org/teapot/ Real teapot @ museum - http: //www. sjbaker. org/teapot/ Stanford bunny images – by Peter Lindstrom et al. well documented at - http: //www. gvu. gatech. edu/people/faculty/greg. turk/bunny. html Lena art images – http: //www. ece. utexas. edu/~sheikh/art/ Actual Lena - http: //www-2. cs. cmu. edu/~chuck/lennapg/lenna. shtml Lena „pointy“ - http: //www-2. cs. cmu. edu/~chuck/lennapg/lenna. shtml Webpages : n Stanford bunny story http: //www. gvu. gatech. edu/people/faculty/greg. turk/bunny. html n The Lena Story - http: //www-2. cs. cmu. edu/~chuck/lennapg/lenna. shtml n A Brief History of The Teapot. - http: //www. sjbaker. org/teapot/ Papers n "Zippered Polygon Meshes from Range Images“ http: //www. cc. gatech. edu/~turk/zipper. html

Famous Images in Computer Graphics & Image Processing Sérgio Leal N. o 0230261 Erasmus student at: Institute for Computer Graphics and Vision Technical University of Graz 2002/2003 mcamara@sbox. TUGraz. at