Background subtraction

Programming Questions

owaunz

in Programming Questions • 2 years ago

What is a good algorithm to subtract background colour from an image

Here is the source image

Here is what you get when you use mspaint

Replies(2)

owaunz

Re: Background subtraction

2 years ago

This is what I can achieve so far source image is on the left.

Here is the code

PImage a;
PImage b;

int w = 0;
int h = 0;
void setup(){
String fn1 = "ninja.png";
String fn2 = "ninja2.png";
String fn3="http://www.cghub.com/files/Image/133001-134000/133794/410_large.jpg";
String fn4 = "http://rupid79.cghub.com/files/Image/134001-135000/134935/724_stream.jpg";
a =loadImage(fn4);
w=a.width;
h= a.height;
size(w*2,h);
back = a.pixels[0];
A = new PVector (back>>16&255,back>>8&255,back&255);

image(a,0,0);
b= createImage(w,h,ARGB);
}

void draw(){
// hit++;
this.frame.setTitle(str(hit));
background(0,0,255);
image(a,0,0);
image(b,w,0);
mouseReleased();
}
PVector A;
PVector B;

float dis;
color back;
int hit=38;
void keyPressed(){
hit = mouseY;
}
void mouseReleased(){
// hit = 10;
b= createImage(w,h,ARGB);
color p = a.get(mouseX,mouseY);

B = new PVector(p>>16&255,p>>8&255,p&255);
dis = dist(A.x,A.y,A.z,B.x,B.y,B.z);

PVector C;
for (int x =0;x<w;x++){
    for (int y =0;y<h;y++){
      color p2 = a.get(x,y);
      C = new PVector(p2>>16&255,p2>>8&255,p2&255);
      float dis2 = dist(A.x,A.y,A.z,C.x,C.y,C.z);
      if(dis2<hit){
        //        b.set(x,y,color(back));
      }
      else
      {
        b.set(x,y,p2);
      }

    }
}
}

owaunz

Re: Background subtraction

2 years ago

I am making some headway. I am now using the copy function to jiggle the source image array.

Here is the result

Here is the code

PImage a;
PImage b;

int w = 0;
int h = 0;
PImage c;
String [] fn = new String[100];
PImage bg;
void setup(){
String fn1 = "ninja.png";
String fn2 = "ninja2.png";
String fn3="http://www.cghub.com/files/Image/133001-134000/133794/410_large.jpg";
String fn4 = "http://rupid79.cghub.com/files/Image/134001-135000/134935/724_stream.jpg"; //38
String fn5="http://www.cghub.com/files/Image/172001-173000/172922/650_max.jpg";
String fn6 = "http://features.cgsociety.org/gallerycrits/54062/54062_1163349072_submedium.jpg";
String fn7 ="http://portfolio.cgsociety.org//assets/userheaders/54062_1217783898.jpg";
String fn8 ="http://www.google.com/intl/en_com/images/srpr/logo3w.png";
String fn9="http://rupid79.cghub.com/files/Image/134001-135000/134666/820_stream.jpg";
String fn10="http://rupid79.cghub.com/files/Image/137001-138000/137502/058_stream.jpg";
String fn11="http://rupid79.cghub.com/files/Image/137001-138000/137033/295_stream.jpg";
String fn12 ="http://rupid79.cghub.com/files/Image/137001-138000/137027/373_stream.jpg";
String fn13="http://rupid79.cghub.com/files/Image/136001-137000/136584/369_stream.jpg";
String fn14 = "http://rupid79.cghub.com/files/Image/135001-136000/135369/702_stream.jpg";
String fn15="http://rupid79.cghub.com/files/Image/133001-134000/133951/814_stream.jpg";
String fn16="http://rupid79.cghub.com/files/Image/133001-134000/133820/550_stream.jpg";
fn[0]="http://cghub.com/files/Image/174001-175000/174881/345_large.jpg";
fn[1]="http://cghub.com/files/Image/089001-090000/89658/035_large.jpg";
fn[2]="http://cghub.com/files/Profile/011001-012000/11376/profile_image_728_large.jpg";
fn[3]="ninja3.png";
String gf = fn3;
a =loadImage(gf);

c =loadImage(gf);
// a.filter(BLUR,1);
w=a.width;
h= a.height;
   size(w*2,h,P3D);
   int ww=38;
   int flick = 3;
for (int i =0;i<1;i++){
    int y = int(i/w);
    int x = i-(y*w);


//    if (x<w/2 && y<h/2)a.copy(a,0,0,w,h,-1,-1,w,h);
//    if(x>w/2 && y<h/2)a.copy(a,0,0,w,h,1,1,w+1,h+1);
//    if(x<w/2 && y>h/2)a.copy(a,0,0,w,h,-1,1,w,h+1);
//    if(x>w/2 && y>h/2)a.copy(a,0,0,w,h,1,-1,w+1,h);
   if (ww==0)a.copy(a,0,0,w,h,-1,-1,w,h);
       if (ww==1)a.copy(a,0,0,w,h,1,1,w+1,h+1);
     if (ww==2)a.copy(a,0,0,w,h,-1,1,w,h+1);
      if (ww==3)a.copy(a,0,0,w,h,1,-1,w+1,h);

         if (ww==4)a.copy(a,0,0,w,h,-1,-1,w+1,h+1);
         if (ww==5)a.copy(a,0,0,w,h,-1,-1,w-1,h-1);
         if (ww==6)a.copy(a,0,0,w,h,0,0,w,h);
         if (ww==7)a.copy(a,0,0,w,h,flick,flick,w-flick,h-flick);

}
if(!online){
println(w);
println(h);
}

back = a.pixels[0];
A = new PVector (back>>16&255,back>>8&255,back&255);

image(a,0,0);
b= createImage(w,h,ARGB);
bg= createImage(w*2,h,ARGB);
   for (int i=0;i<(w*2)*h;i++){
int y = int(i/w);
int x = i - (y*w);
//b.pixels[i]=a.pixels[i];
// b.set(x,y,color(0,0,255));
bg.pixels[i]=color(random(40)+random(40)+random(40)+random(40)+random(40));
   }
mouseReleased();
}

void draw(){
// hit++;
this.frame.setTitle(str(hit));
// background(0,0,255);
image(bg,0,0);
image(c,0,0);
image(b,w,0);
// mouseReleased();
}
PVector A;
PVector B;

float dis;
color back;
int hit=17;//38
void keyPressed(){
hit = mouseY;
}
void mouseReleased(){
if (mouseButton == 39){
    back = a.get(mouseX,mouseY);
   A = new PVector (back>>16&255,back>>8&255,back&255);
}
// hit = 10;
b= createImage(w,h,ARGB);
color p = a.get(mouseX,mouseY);

B = new PVector(p>>16&255,p>>8&255,p&255);
dis = dist(A.x,A.y,A.z,B.x,B.y,B.z);

PVector C;
for (int x =0;x<w;x++){
    for (int y =0;y<h;y++){
      color p2 = a.get(x,y);
      color p3 = c.get(x,y);
      C = new PVector(p2>>16&255,p2>>8&255,p2&255);
      float dis2 = dist(A.x,A.y,A.z,C.x,C.y,C.z);
      if(dis2<hit){
        //        b.set(x,y,color(back));
      }
      else
      {
        b.set(x,y,p3);
      }

    }
}
}

Background subtraction

Replies(2)

Re: Background subtraction

Re: Background subtraction

Statistics

Tags

Actions

Related Posts