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Introduction to Jitter & Eyesweb. Volker Krüger Aalborg Media Lab Aalborg University Copenhagen [email protected] Introduction to Jitter & Eyesweb. What are Jitter and Eyesweb good for? Intuitive programming without programming!

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Introduction to jitter eyesweb

Introduction to Jitter & Eyesweb

Volker Krüger

Aalborg Media Lab

Aalborg University Copenhagen

[email protected]


Introduction to jitter eyesweb1
Introduction to Jitter & Eyesweb

What are Jitter and Eyesweb good for?

  • Intuitive programming without programming!

  • Big variety of functionality, incl. those that you have learned about

  • Easy to use: Simply connect the function boxes

  • Fast prototyping of ideas

  • Jitter: Enhancement to Max/MSP

Agenda

  • Intro to the Jitter specific issues

  • Walk-through through some simple key-examples of Jitter and Eyesweb


Matrices coordinates and dimensions
Matrices – Coordinates and Dimensions

Main important data type in Jitter: Matrices!

  • Like images: they have

    coordinates (x,y) and a size!

  • Matrices can have several

    dimensions: (x,y,z), (x,y,t)


Matrices planes
Matrices -- Planes

  • When displaying, e.g., color images, each pixel is represented with 3 values: R, G, B!

  • This is handled in Jitter with Planes.

  • The A plane can be used for alpha blending.


Allowed datatypes
Allowed Datatypes

  • Available datatypes are:

    • char(8 bit), long(32 bit)

    • float32(32 bit) , float64(64 bit)

  • Functions usually adapt to input, no conversions needed!

  • Parameter can be casted!


Attributes and arguments
Attributes and Arguments!

  • Like in Max/MSP, Jitter functions can have

    • Parameters

    • Attributes

  • Can be given as default values (order matters!)

  • Attributes can be given explicitly (no blank after [email protected]):

  • Can be changes during program execution


Arguments or attributes
Arguments or Attributes?

  • Parameters can be passed as arguments to the functions:

  • Arguments have to be passed before attributes are set.

  • The following are equivalent:


Getting attribute information
Getting Attribute Information

  • In order to read out the attribute setting:

  • To read out the value of a particular attribute:


First example playing a video
First Example: Playing a video

  • read reads the name and passes it on.

  • jit.qt.movie reads video into memory: Parameters: size

  • jit.window opens a window and attempts to display the movie. Parameters: window name, corner position of the window.

  • No data is being copied, except for references!!

  • And not data is being displayed either!!!


The output has to be triggered
The output has to be triggered!

  • jit.window needs to be triggered!

  • The example sends a bang every 40 ms.

  • To restart the movie, set the attribute time to zero!




Working with matrices
Working with Matrices

  • How to generate a matrix of a particular type:

  • This reserves a region inside the computer memory for the data

  • Parameters are planecount, type and dim.


Printing matrix data
Printing matrix data

  • To print the matrix data a special function exists:jit.print

  • print left prints the reference to the matrix. It is a random name!


Setting and reading values
Setting and reading values

  • setcell

  • getcell

  • setall

  • clear


Window object
Window object

  • Having set the matrix values we can output the values visually using jit.pwindow

  • It can be found in the task bar


Setting the values of the entire matrix
Setting the values of the entire matrix

  • Setting each single matrix value separately is tedious.

  • Alternative: Use loops and functions:

  • Uzi <val> sends numbers 1 … <val>


Matrices in eyesweb
Matrices in Eyesweb

  • Hardly ever used explicitly!

  • Matrices are used

    • in replacement of images

    • as filter matrices


Jitter operators
Jitter Operators

  • In Jitter, mathematical operators can be applied to matrices:

  • This allows to generate important functions like thresholding!


Jitter operators1
Jitter Operators

  • For multi-band images, the operator can be applied to each image band separately:



Connection to the outside world
Connection to the outside world

  • Additional programs can be developped for Jitter and Eyesweb.

    • Possible in Java and C/C++

  • Eyesweb allows TCP/IP interfacing (e.g. network cameras, process communication)


Things to remember why you were here today
Things to remember: Why you were here today!

  • Jitter and Eyesweb base everything on Matrices

  • Intuitive to use

  • They process video data

  • Jitter and Eyesweb are easy to use and are the basic systems to use for your project.

    Info for Jitter: www.cycling74.com

    Info for Eyesweb: www.eyesweb.org

    www.media.aau.dk/~vok/lectures/ap1_11_05/ap11.html


Finally
Finally:

  • Questions?

  • Exercises under http://media.aau.dk/~vok/lectures/ap1_11_05/ex11.pdf


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