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trying to create a video out of a color-array

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- 03-Nov-2010 01:07 PM
- Forum: Programming Questions
hi all,

I am pretty new to processing, trying to start a sketch that is using a video and display it onto the screen until the user presses a mouse-button and then the video should be transformed in the following way: comparing the values of red, green and blue of each pixel and setting the pixel's color to the color (r,g,b) that has the highest value

I do have a working version for a image already and I am trying to do a similar thing for a video write now. I thought I could just create a new image, creating an array for the new color and with the pixels-function I can set the new color to the color stored in the array and then display the image... but somehow it doesn't work as expected.... I get the following error ArrayIndexOutOfBorder in the last line...

here is the code, maybe someone could help?? thanks in advance!

SuseJule

import processing.video.*;

Capture video;

PImage transformed_picture;

void setup()

{

  size (640,480);

  video = new Capture(this, width, height, 1);

  transformed_picture = createImage(width, height, ARGB);

}

void draw()

{

  originalpicture(); // function to display original picture as long as mouse has not been pressed

}

void mousePressed() //on mousepress show the transformed video

{

  transformedpicture();

}

void originalpicture()

{

  video.read();

  loadPixels();

  // loading video pixels

  video.loadPixels();

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

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

   int mycolor = x + y*width;

   // getting values of red, green, blue of the pixel

   float r = red(video.pixels[mycolor]);

   float g = green(video.pixels[mycolor]);

   float b = blue(video.pixels[mycolor]);

   pixels[mycolor] = color(r,g,b);

   }

  }

  updatePixels();

}

color [] transformedcolor= new color [height*width]; //array for new colors

void transformedpicture()

{

  video.read();

  loadPixels();

  //loading pixels of video

  video.loadPixels();

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

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

   int mycolor = x + y*video.width;

   // getting values of red, green, blue of the pixel

   float r = red(video.pixels[mycolor]);

   float g = green(video.pixels[mycolor]);

   float b = blue(video.pixels[mycolor]);

   //compare red, green and blue values and set the pixels to the color that is most in

   if (r<=g)

   {

   transformedcolor[mycolor]= color(0,255,0);

   } //green

   if (g<=b)

   {

   transformedcolor[mycolor]= color(0,0,255);

   } //blue

   if (b<r)

   {

   transformedcolor[mycolor]= color(255,0,0);

   } //red

   transformed_picture.pixels[mycolor]=transformedcolor[mycolor];

   }

   image(transformed_picture,0,0);

  }

}

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