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Index › Programming Questions & Help › Video Capture, Movie Playback, Vision Libraries › How to create a color analyzer with JMyron

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How to create a color analyzer with JMyron? (Read 950 times)

adamkerry

How to create a color analyzer with JMyron?
Mar 16^th, 2007, 8:49pm

Here is what I am trying to do:

At my work I analyze samples of lubricants, oils, etc. One thing we look at is the colour of the sample. I am trying to eliminate any subjectivity on the analysis of the colour of the sample. One idea I had was to create a "color analyzer" utilizing my webcam. My goal was to ultimately reduce the colour of the sample to the R,G,B values (the samples are in clear bottles and I was planning on placing them beside the webcame while iluminating them with some sort of light source). I noticed that JMyron has the following command:

"average(int left,int top,int right,int bottom) will average a given rect of pixels in the differenceImage and return the overall color. The return is a color. In Lingo, this is a color object. In Processing, this is an single integer color, whose color channel values can be retrieved using the functions red(), green(), and blue()."

I have JMyron installed, and I can view the video feed through Processing fine. However, when it comes to editing the code to do what I want to do, I am at a loss - I do not know where to even begin. Any suggestions?

Ideally I would want to somehow change the video feed from the webcam to display a single colour - the average of all the pixels. Further, if there was a way to somehow display the R,G,B values also, that would be swell. If the later is too difficult, I can use a colour picker program that I have (where it displays the colour that the mouse cursor is touching).

Thanks...

mshaub

Re: How to create a color analyzer with JMyron?
Reply #1 - Oct 25^th, 2008, 3:32am

I'm working on a matrix-averaging sketch right now. Part of making a mosaic of an image is the same color averaging you asked about. I think the following code is what you asked for. Though it's been a long time since you asked, hope this can help you out, or maybe the next person searching for help.

Quote:

//Michael Shaub
//Oct, 24, 2008
//www.cageybirds.com/blog
//-------------
//Based very much on "Myron_tracking" by JTNIMOY

/*
this is an example of averaging all the video pixels.
pixels are rendered as 1 full image rectangle.

last tested to work in Processing 0154

Mike Shaub

*/

import JMyron.*; //calls the jMyron library

JMyron m; //a camera object
int avgColor = 0; //single integer color for camera average

void setup(){
size(320,240); //display size
m = new JMyron();//make a new instance of the object
m.start(width,height);//start a capture at 320x240
println("Myron " + m.version());
noStroke();
}

void draw(){
background(255);
m.update();//update the camera view
int[] img = m.image(); //get the normal image of the camera

//measures average color "Variable = m.average(left, top, right, bottom)"
avgColor = m.average(0, 0, width, height); //measures average color value of entire image

//Set fill color to average values
fill(red(avgColor),green(avgColor),blue(avgColor)); //red() calls red channel value from single integer color
rect(0,0,width,height); //draw rectangle on entire screen filled with average color

//Output Text of RGB values
println("Red = " + red(avgColor)
+ ", Green = " + green(avgColor)
+ ", Blue = " + blue(avgColor));

}

void mousePressed(){
m.settings();//click the window to get the settings
}

public void stop(){
m.stop();//stop the object
super.stop();
}

_mike Shaub&&Artist, Designer, SEGD Member

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