color-watagashi

120201-color-watagashi.pde

import processing.video.*;

Capture cam;

void setup() {
  size(320, 240);
}


void draw() {
  if (cam.available() == true) {
    cam.read();

    float sum_red   = 0;
    float sum_green = 0;
    float sum_blue  = 0;

    // 色値をRGB別に積算し平均を求める
    for (int x = 0; x < cam.width; x++)
    {
      for (int y = 0; y < cam.height; y++)
      {   
        color c = cam.get(x, y);
        
        float tmp_red   = red(c);
        float tmp_green = green(c);
        float tmp_blue  = blue(c);
        
        sum_red   += tmp_red;
        sum_green += tmp_green;
        sum_blue  += tmp_blue;
      }
    }
    
    int R = (int)(sum_red   / (cam.width * cam.height));
    int G = (int)(sum_green / (cam.width * cam.height));
    int B = (int)(sum_blue  / (cam.width * cam.height));
    
    // 最小色値を求める
    int RGBlist[] = {R, G, B};
    int RGBmin = RGBlist[0];
    for (int i = 0; i < 3; i++)
    {
      if (RGBlist[i] < RGBmin)
      {
        RGBmin = RGBlist[i];
      }
    }
    
    // 最小色値に基づいてRGB色値を正規化する
    int heightR, heightG, heightB;
    if (RGBmin != 0)
    {
      heightR = cam.height * (R-RGBmin) / ((R-RGBmin)+(G-RGBmin)+(B-RGBmin));
      heightG = cam.height * (G-RGBmin) / ((R-RGBmin)+(G-RGBmin)+(B-RGBmin));
      heightB = cam.height * (B-RGBmin) / ((R-RGBmin)+(G-RGBmin)+(B-RGBmin));
    }
    else
    {
      heightR = 0; heightG = 0; heightB = 0; // 真っ暗なとき
    }
    
    // 矩形を描画する
    //strokeWeight(20);
    //noFill(); // 塗りつぶさない
    if(heightR != 0)
    {
      rect(0, 0, cam.width, heightR);
    }
    
    
    println(
      "R: " + R + " " +
      "G: " + G + " " +
      "B: " + B + " " +
      "RGBmin: " + RGBmin + " " +
      "heightR: " + heightR + " " +
      "heightG: " + heightG + " " +
      "heightB: " + heightB + " "
      );

    image(cam, 0, 0);
  }
}