Processing 2. Креативное программирование
.pdf
, - .
, , captureEvent().draw() webcam.available(), . , . -if,. webcam.read()Processing image().
, -loadPixels(). for., . .
for ( int i = 0; i < numPixels; i++ ) { float b = brightness( webcam.pixels[i] ); if ( b > threshold ) {
pixels[i] = color( 255 );
}else {
pixels[i] = color( 0 );
}
}
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“ ” “ ” . , - ., .
, , ,. ., ,.
video .Capture ..
import processing.video.*;
Capture webcam; int threshold;
int topLeftX; int topLeftY;
int bottomRightX; int bottomRightY;
void setup()
{
size( 640, 480 );
webcam = new Capture( this, width, height, 30); webcam.start();
threshold = 127;
topLeftX = width; topLeftY = height;
bottomRightX = 0; bottomRightY = 0;
}
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draw() , ,. for,. .
void draw()
{
if ( webcam.available() ) { webcam.read();
image( webcam, 0, 0 );
loadPixels();
int counter = 0;
for ( int j = 0; j < webcam.height; j++ ) { for ( int i = 0; i < webcam.width; i++ ) {
color c = webcam.pixels[counter]; float b = brightness( c );
if ( b > threshold ) { pixels[counter] = color( 255 ); if ( i < topLeftX ) {
topLeftX = i;
}
if ( j < topLeftY ) { topLeftY = j;
}
if ( i > bottomRightX ) { bottomRightX = i;
}
if ( j > bottomRightY ) { bottomRightY = j;
}
}else {
pixels[counter] = color( 0 );
}
counter++;
}
}
updatePixels();
noFill();
stroke( 255, 0, 0 ); strokeWeight( 2 );
rect( topLeftX, topLeftY, bottomRightX - topLeftX, bottomRightY - topLeftY );
// reset tracking points topLeftX = width; topLeftY = height;
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bottomRightX = 0; bottomRightY = 0;
fill( 255, 0, 0 ); noStroke();
rect( 10, 10, 110, 20 ); fill( 255 );
text( "Threshold: " + threshold, 14, 24 );
}
}
void keyPressed()
{
if ( key == CODED ) {
if ( keyCode == UP ) { threshold++;
}
if ( keyCode == DOWN ) { threshold--;
}
}
}
, ., - .
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. , .. ,.
topLeftX .topLeftY . .
topLeftX = width; topLeftY = height;
for i . - ,topLeftX. ,topLeftX.x . for j. y. min().:
topLeftX = min( i, topLeftX ); topLeftY = min( j, topLeftY );
i j bottomRightX bottomRightY. .max(). min() -. , :
rect( topLeftX, topLeftY, bottomRightX - topLeftX, bottomRightY - topLeftY );
, .
. . ,, . ,,- .
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.color trackColor,: , . maxColorDifference.
import processing.video.*;
Capture webcam;
color trackColor; int trackR;
int trackG; int trackB;
int topLeftX; int topLeftY;
int bottomRightX; int bottomRightY;
int maxColorDifference;
void setup()
{
size( 640, 480 );
webcam = new Capture( this, width, height ); webcam.start();
trackColor = color( 255 );
trackR = (trackColor >> 16) & 0xff; trackG = (trackColor >> 8) & 0xff; trackB = trackColor & 0xff; maxColorDifference = 40;
topLeftX = width; topLeftY = height;
bottomRightX = 0; bottomRightY = 0;
}
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draw() , .brightness() , dist().maxColorDifference,, .
void draw()
{
if ( webcam.available() ) { webcam.read();
image( webcam, 0, 0 );
loadPixels();
int counter = 0;
for ( int j = 0; j < webcam.height; j++ ) { for ( int i = 0; i < webcam.width; i++ ) {
color c = webcam.pixels[counter]; int r = (c >> 16) & 0xff;
int g = (c >> 8) & 0xff; int b = c & 0xff;
float colorDifference = dist( r, g, b, trackR, trackG, trackB );
if ( colorDifference < maxColorDifference ) { if ( i < topLeftX ) {
topLeftX = i;
}
if ( j < topLeftY ) { topLeftY = j;
}
if ( i > bottomRightX ) { bottomRightX = i;
}
if ( j > bottomRightY ) { bottomRightY = j;
}
}
counter++;
}
}
updatePixels();
// draw tracking color fill( trackColor ); noStroke();
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rect( 0, 0, 20, 20 );
noFill(); stroke( 0 );
strokeWeight( 2 );
rect( topLeftX, topLeftY, bottomRightX - topLeftX, bottomRightY - topLeftY );
// reset tracking points topLeftX = width; topLeftY = height; bottomRightX = 0; bottomRightY = 0;
}
}
mousePressed() , ..
void mousePressed()
{
trackColor = webcam.get( mouseX, mouseY ); trackR = (trackColor >> 16) & 0xff;
trackG = (trackColor >> 8) & 0xff; trackB = trackColor & 0xff;
}
, - :
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:
color c = webcam.pixels[counter]; int r = (c >> 16) & 0xff;
int g = (c >> 8) & 0xff; int b = c & 0xff;
float colorDifference = dist( r, g, b, trackR, trackG, trackB );
c.shifting , .int r = (c >> 16) & 0xff; , int r = red( c ), . , green() blue(). , , .Processing reference at http:// processing.org/reference/rightshift.html.
dist() . x, y z , . dist() -. , . colorDifference ,maxColorDifference, . , , , .
OpenCV
Processing - video. ,, OpenCV.
OpenCV Processing Java Mac OS X, Windows Linux. ,: http://ubaa.net/shared/processing/ opencv/.
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-, OpenCV. Windows OpenCV 1.0 . Mac OS X OpenCV framework 1.1. DMG . LinuxOpenCV / .
- OpenCV Processing, -Processing. ,:
OpenCV (Open Source Computer Vision) Intel,
Willow Garage. Processing OpenCV 1.0 Windows 1.1
Mac OS X. 2006 2008 , . OpenCV 2.3.1, - . OpenCV 1.0 C. 2.0 C ++ C#, Ruby Java. , ProcessingOpenCV, .
OpenCV , 64- . , 32- . Processing | Preferences - , Launch programs 32-bit mode.
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