OpenCV and Processing 3

Posted by bryan

This example will demonstrate the use of CvType, Size and Scalar.

CvType defines all the matrix types in OpenCV. It describes the number of channels, and depth information for each element (pixel) in the matrix. This example will use CV_8UC1 – 8 bits unsigned char, 1 channel. To communicate with Processing, we usually take CV_8UC4 for ARGB as the RGB format in PImage also uses 4 bytes for storage.
 
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Some thoughts about the recent OpenCV and films works

Posted by bryan

It is about time to write up something about the recent works (post 1, post 2) that I have done with OpenCV and the classic film sequences. I started the recent version of the project first for the submission to the Image Conference in Berlin and then the Microworld exhibition in Hong Kong. The software I have been testing is the OpenCV library, openFrameworks and Processing. For the final show, I may choose openFrameworks for performance and stability reasons.

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Drawing Machines

Posted by bryan

In the recent preparation for classes, I come into this topic of drawing machines. Here are some examples from YouTube.
 

 

 
And the Machine Art exhibition
 
Art Machines Machine Art

 

Neurosky MindWave and Processing

Posted by bryan

This is my first trial run of a Neurosky MindWave sensor with a custom program written in Processing. The connection architecture is quite straight forward. The ThinkGear connector is a background process that reads from the IR serial port to obtain the brainwave signals and distributes them through a TCP socket server (localhost with port 13854).
 

 
There are a number of Java socket clients implementation. I use the ThinkGear Java library from Creation.

Eric Blue has another Processing based visualizer using the MindWave.

ZeroShore has another implementation with an animation called HyperCat.
 
Sample Code

import processing.video.*;
import neurosky.*;
import org.json.*;
 
ThinkGearSocket neuroSocket;
int attention = 0;
int meditation = 0;
int blinkSt = 0;
PFont font;
int blink = 0;
Capture cap;
 
void setup() 
{
  size(640, 480);
  ThinkGearSocket neuroSocket = new ThinkGearSocket(this);
  try 
  {
    neuroSocket.start();
  } 
  catch (ConnectException e) {
    e.printStackTrace();
  }
  smooth();
  font = loadFont("MyriadPro-Regular-24.vlw");
  textFont(font);
  frameRate(25);
  cap = new Capture(this, width, height);
  noStroke();
}
 
void draw() 
{
  background(0);
 
  image(cap, 0, 0);
  fill(255, 255, 0);
  text("Attention: "+attention, 20, 150);
  fill(255, 255, 0, 160);
  rect(200, 130, attention*3, 40);
  fill(255, 255, 0);
  text("Meditation: "+meditation, 20, 250);
  fill(255, 255, 0, 160);
  rect(200, 230, meditation*3, 40);
 
  if (blink>0) 
  {
    fill(255, 255, 0);
    text("Blink: " + blinkSt, 20, 350);
    if (blink>15) 
    {
      blink = 0;
    } 
    else 
    {
      blink++;
    }
  }
}
 
void captureEvent(Capture _c) 
{
  _c.read();
}
 
void attentionEvent(int attentionLevel) 
{
  attention = attentionLevel;
}
 
void meditationEvent(int meditationLevel) 
{
  meditation = meditationLevel;
}
 
void blinkEvent(int blinkStrength) 
{
  blinkSt = blinkStrength;
  blink = 1;
}
 
void stop() {
  neuroSocket.stop();
  super.stop();
}