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VJ Software using Processing

[2 Replies]
- 27-May-2013 01:35 PM
- Forum: General Discussion
I am looking into a new language for making a vj program. A piece of software than can mix in separate channels of video, receive user input, add effects, and then output, etc.

I am using Quartz Composer now to make my video mixing programs. I was told it wouldn't work that good but I use it all the time to mix 3 video, live feed, and output to syphon at 60fps. Yet now, Quartz faces deprecation.

I know Processing can do all of these features individually, but, as video mixing is usually hardware intensive, is this the best environment to develop such a program? Is this language suitable for such a piece of software? I looked around and did not find any examples of someone using Processing to make such a program. I like the wide array of libraries and great documentation/community support plus being able to package and distribute is huge! Quartz fails at this miserably.

My other idea is to write it in something like Cinder or OpenFrameworks if Java is not meant to handle these kinds of interactions and computation.

Connecting points with lines

[2 Replies]
- 22-May-2013 07:50 PM
- Forum: Contributed Library Questions
I have been working on this openCV project and I am looking to connect the final dots together, literally.

How can I get the points from the blobs to draw lines from one another?
I tried to make a PVector array from a few pieces of code and I feel like I am getting close just missing the last part.
2. import hypermedia.video.*;
3. import java.awt.Rectangle;
4. import java.awt.Point;
6. OpenCV opencv;
7. int LIMIT = 300;
8. int cvthreshold = 80;
9. int blur = 5;
10. PVector[] vex;
11. int numpoints;
13. void setup() {
14. size(640, 480, P3D);
15. opencv = new OpenCV(this);
16. opencv.allocate(640, 480);
17. opencv.capture(640, 480);
18. vex = new PVector[numpoints];
20. // for(int i = 0; i < vex.length; i++){
21. // vex[i] = new PVector(random(50,width-50), random(50,height-50));
22. //
23. // }
24. }
26. void draw() {
27. background(10);
29. opencv.read();
30. opencv.blur(OpenCV.BLUR, blur);
31. opencv.threshold(cvthreshold);
32. image(opencv.image(), 0, 0, 640, 480);
34. Blob[] blobs = opencv.blobs(20, width*height/50, 40, true);
36. int numpoints = blobs.length;
37. println("Number of points =" + numpoints);
40. noFill();
41. pushMatrix();
43. for (int i = 0; i < blobs.length; i++) {
44. Rectangle bounding_rect = blobs[i].rectangle;
45. float area = blobs[i].area;
46. float circumference = blobs[i].length;
47. Point centroid = blobs[i].centroid;
48. Point centroid2 = blobs[i].centroid;
53. stroke(255, 255, 255, 150);
54. strokeWeight(2);
55. // line(centroid.x, centroid.y, 0, 0); // Top Left
56. // line(centroid.x, centroid.y, 640, 0); // Top Right
57. // line(centroid.x, centroid.y, 0, 480); // Bottom Left
58. // line(centroid.x, centroid.y, 640, 480); // Bottom Right
61. noStroke();
63. stroke(255);
64. strokeWeight(5);
65. point(centroid.x, centroid.y);
67. noStroke();
68. fill(100, 100);
69. ellipse(centroid.x, centroid.y, 50, 50);
70. ellipse(centroid.x, centroid.y, 35, 35);
71. }
73. //// //DRAWS LINES
74. // for (int t = 0; t < vex.length; t++) {
75. // PVector pv1 = vex[t];
76. // for (int g = 0; g < vex.length; g++) {
77. // PVector pv2 = vex[g];
78. // float d = dist(pv1.x, pv1.y, pv2.x, pv2.y);
79. // if (d <= LIMIT) {
80. // line(pv1.x, pv1.y, pv2.x, pv2.y);
81. // }
82. // }
83. // }
85. popMatrix();
86. }
89. //This allows you to use the mouse the adjust blur and threshold
90. void mouseDragged() {
91. cvthreshold = int( map(mouseX, 0, width, 0, 255) );
92. blur = int( map(mouseY, 0, height, 50, 0) );
93. }

Send out Blobs via Syphon

[1 Reply]
- 22-May-2013 11:33 AM
- Forum: Integration and Hardware
How can I correctly wrap just the Blob parts of this sketch to send out via Syphon?

This sketch takes in the Kinect clean IR, filters it, and then draws Blobs on top. I want to send out just the Blobs via syphon.

At first I gathered that the blobs are not images but shapes, so you must collect them into one scene (PGraphics?) so that Syphon can take this feed and send it out. However I was only able to send out a blank syphon feed, it did not seem to correctly gather all of the blobs if I put a canvas.beginDraw(); above and a canvas.endDraw(); below the blob code.

How do I correctly send out just the Blob part?

Thanks for any suggestions,

----------

import SimpleOpenNI.*;

import hypermedia.video.*;

import java.awt.Rectangle;

import java.awt.Point;

import codeanticode.syphon.*;

PGraphics canvas;

SyphonServer server;

SimpleOpenNI kinectLib;

OpenCV opencv;

int cvthreshold = 80;

int blur = 5;

void setup() {

size(640, 480, P3D);

canvas = createGraphics(640,480,P3D);

kinectLib = new SimpleOpenNI(this);

opencv = new OpenCV(this);

opencv.allocate(640, 480);

server = new SyphonServer(this, "BlobsOut");

if (kinectLib.enableIR() == false) {

println(" can't open IR ");

exit();

return;

}

}

void draw() {

kinectLib.update();

background(122);

// copy the RGB image into opencv

opencv.copy(kinectLib.irImage(), 0, 0, 640, 480, 0, 0, 640, 480);

opencv.absDiff();

opencv.blur( OpenCV.BLUR, blur );

opencv.threshold(cvthreshold);

image(opencv.image(), 0, 0, 640, 480);

// This generates the blobs

Blob[] blobs = opencv.blobs( 20, width*height/100, 20, true );

noFill();

pushMatrix();

translate(0, 0);

for ( int i=0; i<blobs.length; i++ ) {

Rectangle bounding_rect = blobs[i].rectangle;

float area = blobs[i].area;

float circumference = blobs[i].length;

Point centroid = blobs[i].centroid;

Point[] points = blobs[i].points;

// rectangle

noFill();

stroke( blobs[i].isHole ? 128 : 64 );

rect( bounding_rect.x, bounding_rect.y, bounding_rect.width, bounding_rect.height );

// centroid

stroke(0, 0, 255);

line( centroid.x-5, centroid.y, centroid.x+5, centroid.y );

line( centroid.x, centroid.y-5, centroid.x, centroid.y+5 );

noStroke();

fill(0, 0, 255);

text( area, centroid.x+5, centroid.y+5 );

fill(255, 0, 255, 64);

stroke(255, 0, 255);

if ( points.length>0 ) {

beginShape();

for ( int j=0; j<points.length; j++ ) {

vertex( points[j].x, points[j].y );

}

endShape(CLOSE);

}

noStroke();

fill(255, 0, 255);

text( circumference, centroid.x+5, centroid.y+15 );

}

popMatrix();

}

void keyPressed() {

opencv.copy(kinectLib.irImage(), 0, 0, 640, 480, 0, 0, 640, 480);

opencv.threshold(80);

opencv.remember(OpenCV.BUFFER);

}

//This allows you to use the mouse the adjust blur and threshold

void mouseDragged() {

cvthreshold = int( map(mouseX, 0, width, 0, 255) );

blur = int( map(mouseY, 0, height, 50, 0) );

}

-----------

Trouble with Absolute Difference in OpenCV

[2 Replies]
- 21-May-2013 06:11 PM
- Forum: Contributed Library Questions
I have been using a Kinect's IR feed to track blobs using OpenCV then doing fun things with the points and send that out through Syphon.

I was able to use the opencv.absDiff(); method to remove the background using the space bar using my webcam earlier. However, when I switched to using the Kinect's IR feed I was unable to perform the background subtraction. This is a mission critical feature, so I am trying to see how it can be done.

I got the IR feed into OpenCV through the opencv.copy(); method and I believe that is somehow the issue. I know in the CV reference sheet, you should be able to specify if the absDiff(); should look at the capture or a buffer but I am not sure how.

Any suggestions?

-----

import codeanticode.syphon.*;

import hypermedia.video.*;

import java.awt.Rectangle;

import java.awt.Point;

import SimpleOpenNI.*;

OpenCV opencv;

SimpleOpenNI context;

SyphonServer syphonout;

int w = 640;

int h = 480;

int cvthreshold = 80;

int blur = 5;

PImage img; //This becomes the infrared feed from the Kinect

boolean find=true; //Not really sure what this does

PFont font;

void setup() {

size( w, h, P3D );

context = new SimpleOpenNI(this);

context.enableIR();

opencv = new OpenCV( this );

opencv.capture(640, 480);

syphonout = new SyphonServer(this, "SyphonOut");

println( "Drag mouse inside sketch window to change threshold" );

println( "Press space bar to record background image" );

}

void draw() {

background(0);

context.update(); //Updates kinect feed

PImage img = context.irImage(); // Asigns IR feed to "img"

opencv.copy(img); // Gives kinect IR to OpenCV's buffer

//opencv.read();

opencv.absDiff();

opencv.blur( OpenCV.BLUR, blur );

opencv.threshold(cvthreshold);

//image( opencv.image(), 0, 0 );

image(context.irImage(),0 ,0);

// This generates the blobs

Blob[] blobs = opencv.blobs( 100, w*h/3, 20, true );

noFill();

pushMatrix();

translate(0, 0);

for ( int i=0; i<blobs.length; i++ ) {

Rectangle bounding_rect = blobs[i].rectangle;

float area = blobs[i].area;

float circumference = blobs[i].length;

Point centroid = blobs[i].centroid;

Point[] points = blobs[i].points;

// rectangle

noFill();

stroke( blobs[i].isHole ? 128 : 64 );

rect( bounding_rect.x, bounding_rect.y, bounding_rect.width, bounding_rect.height );

// centroid

stroke(0, 0, 255);

line( centroid.x-5, centroid.y, centroid.x+5, centroid.y );

line( centroid.x, centroid.y-5, centroid.x, centroid.y+5 );

noStroke();

fill(0, 0, 255);

text( area, centroid.x+5, centroid.y+5 );

fill(255, 0, 255, 64);

stroke(255, 0, 255);

if ( points.length>0 ) {

beginShape();

for ( int j=0; j<points.length; j++ ) {

vertex( points[j].x, points[j].y );

}

endShape(CLOSE);

}

noStroke();

fill(255, 0, 255);

text( circumference, centroid.x+5, centroid.y+15 );

}

popMatrix();

syphonout.sendImage(img);

}

//This allows the background the be removed

void keyPressed() {

if ( key==' ' ) opencv.remember();

}

//This allows you to use the mouse the adjust blur and threshold

void mouseDragged() {

cvthreshold = int( map(mouseX, 0, width, 0, 255) );

blur = int( map(mouseY, 0, height, 50, 0) );

}

public void stop() {

opencv.stop();

super.stop();

}

------

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