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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!


Example for message passing

Example for Message Passing


Reading and displaying videos in eyesweb

Reading and Displaying Videos in Eyesweb


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:


Operators in eyesweb

Operators in Eyesweb


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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