1 / 20

Animation

Animation. Jon Johansson. Animation. Webster, defines “animation” as a: “a motion picture made by photographing successive positions of inanimate objects (as puppets or mechanical parts)”

verdad
Download Presentation

Animation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Animation Jon Johansson

  2. Animation • Webster, defines “animation” as • a: “a motion picture made by photographing successive positions of inanimate objects (as puppets or mechanical parts)” • b: “Animated Cartoon, a motion picture made from a series of drawings simulating motion by means of slight progressive changes."

  3. Animation • Animation - The best visual cue of depth and time is one of motion. • Single frame animation - generate a series of frames and convert them to an mpeg • mpeg_encode (Berkley mpeg encoder) • ppmtompeg (Berkley mpeg encoder distributed with libpbm)

  4. Animation • Parallax - the "apparent motion" of an object against a distant background because of a perspective shift • parallax can help our brain organize the relative positions of points

  5. Animation • the object rotates counterclockwise • red point appears to move to the left relative to the background • magenta point appears to move to the right

  6. Animation • for our purposes we will generate a series of images, one for each step • time step • spatial movement

  7. Animation • scientific visualization packages generally include some ability to generate a series of successive frames

  8. MPEG Encoding • A compression standard for audio, video, and data established by the International Telecommunications Union and International Standards Organization.

  9. MPEG-1 • MPEG-1 standard • established in 1992 • designed to produce reasonable quality images and sound at low bit rates (e.g., 352x288 images with VHS quality at 1.5 Mbits/sec) • portable results

  10. MPEG-2 • MPEG-2 standard • established in 1994 • designed to produce higher quality images at higher bit rates (e.g., 720x480 studio quality CCIR-601 images at up to 15 Mbits/sec) • DVD video is usually encoded from digital studio master tapes to MPEG-2 format

  11. Berkley MPEG-1 Encoder • Available from: http://bmrc.berkeley.edu/frame/research/mpeg/ • Known to compile on several Unixes: • SunOS 4.1.3 • HPUX 9.0.3 • Ultrix 4.4 • OSF • IRIX v4 • IRIX v5

  12. MPEG Software Simulation Group (MSSG) • Provide a free encoder for MPEG 1 and 2 • mpeg2encode • Available from http://www.mpeg.org/MPEG/MSSG/ • Works under Windows 2000 (I use this) • Compiles under some unixes as well • This encoder is also distributed with ImageMagick

  13. MPEG Encoder • Encoder is included in the VisWorkshop.zip package available by copying from • /scratch/jonj • This version compiles under Irix and the executable is included • Mpeg_encode is already installed on aurora so you just have to type • mpeg_encode param_file • Have some work to do to set up the parameter file • Sample images are available from • /scratch/dthornto/Workshop/FramesMHeimpel

  14. MPEG Encoder • The mpeg_tutor directory contains several parameter files • Read explained.par for a good description • quality.par contains parameters for a good quality mpeg

  15. Mpeg_encode parameters # Hi-Quality mpeg_encode parameter file # Robert Wenzlaff # # ******* Stuff you NEED to set ************************ OUTPUT quality-f-lc.mpg BASE_FILE_FORMAT PPM YUV_SIZE 360x288 #INPUT_CONVERT tgatoppm * # If you have ppm files comment this out INPUT_DIR . # Read from the current directory INPUT Regframe.*.ppm [1000-1098] END_INPUT

  16. NetPBM • utilities for primitive manipulation of graphic images • converters from one graphics format to another • mpegs by: • ppmtompeg • can be built on many Unices including: Linux, AIX, Irix • get the package from • http://netpbm.sourceforge.net/

  17. IrfanView (Windows) • freeware by Irfan Skiljan from Austria • http://www.irfanview.com/ • converts between almost 100 image formats • allows for some basic image manipulation • I use this almost every day – I find it extremely useful

  18. TMpgEnc (Windows) • originally the Tsunami Mpeg Encoder • http://www.tmpgenc.net/ • shareware by Hiroyuki Hori from Japan • mpeg 1 encoding is free – must license to do mpeg 2 encoding past a 30 day trial

  19. Mpeg Encoding • in order to create an mpeg animation from a set of frames I will typically: • use IrfanView to convert the batch of images to .bmp format • point TMpgEnc at the first .bmp in the series and click on “start” • the default values for encoding are very good, but the quality can be made better by simply increasing the bitrate

More Related