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Need some help for a detection color through webcam

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- 14-Nov-2011 12:20 AM
- Forum: Contributed Library Questions
Hi everyone,

I m beginner in processing, so that why I m asking some help,

Actually I m working on a project on light color detection, I mean what I would like to do

is through the webcam in a dark room detect colors and make simple interaction with those colors.

So more precisely, it would be more like an installation in a dark room where is gonna be 4 lights, a red one , a blue one ,

a green one and just a normal one yellow, white fluorescent.

So when i switch on one of them, the cam detect the color and make appear a picture under the lamp, and when i

switch off the lamp it disappear.

So for that I was thinking of using the gsvideo library with the brightness tracking example, using the same concept

but I dunno how to modify it to have the result expected.

so if you could help me out it would be great

So here is the code I d like to modify

/**

* Brightness Tracking

* by Golan Levin.

*

* GSVideo version by Andres Colubri.

*

* Tracks the brightest pixel in a live video signal.

*/

import codeanticode.gsvideo.*;

GSCapture video;

void setup() {

size(640, 480); // Change size to 320 x 240 if too slow at 640 x 480

// Uses the default video input, see the reference if this causes an error

video = new GSCapture(this, width, height);

video.start();

noStroke();

smooth();

}

void draw() {

if (video.available()) {

video.read();

image(video, 0, 0, width, height); // Draw the webcam video onto the screen

int brightestX = 0; // X-coordinate of the brightest video pixel

int brightestY = 0; // Y-coordinate of the brightest video pixel

float brightestValue = 0; // Brightness of the brightest video pixel

// Search for the brightest pixel: For each row of pixels in the video image and

// for each pixel in the yth row, compute each pixel's index in the video

video.loadPixels();

int index = 0;

for (int y = 0; y < video.height; y++) {

for (int x = 0; x < video.width; x++) {

// Get the color stored in the pixel

int pixelValue = video.pixels[index];

// Determine the brightness of the pixel

float pixelBrightness = brightness(pixelValue);

// If that value is brighter than any previous, then store the

// brightness of that pixel, as well as its (x,y) location

if (pixelBrightness > brightestValue) {

brightestValue = pixelBrightness;

brightestY = y;

brightestX = x;

}

index++;

}

}

// Draw a large, yellow circle at the brightest pixel

fill(255, 204, 0, 128);

ellipse(brightestX, brightestY, 200, 200);

}

}

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