373 week 9

###Binary Erosion
height = getHeight();
width = getWidth();

v = newArray(width*height);

for(y = 1; y < height-1; y++){
    for(x = 1; x < width-1; x++){
        if(getPixel(x,y) != 0 && getPixel(x-1,y) != 0 && getPixel(x+1,y) != 0 && getPixel(x,y-1) != 0 && getPixel(x,y+1) != 0){
            v[x+y*width] = 255;
        }else{
            v[x+y*width] = 0;
        }
    }
}

for(y = 1; y < height-1; y++){
    for(x = 1; x < width-1; x++){
        setPixel(x, y, v[x+y*width]);
    }
}


###Binary close
height = getHeight();
width = getWidth();

v = newArray(width*height);

for(y = 1; y < height-1; y++){
    for(x = 1; x < width-1; x++){
        if(getPixel(x,y) == 0 && getPixel(x,y-1) == 0 && getPixel(x,y+1) == 0 && getPixel(x-1,y-1) == 0 && getPixel(x+1,y+1) == 0){
            v[x+y*width] = 0;
        }else{
            v[x+y*width] = 255;
        }
    }
}

u = newArray(width*height);

for(y = 1; y < height-1; y++){
    for(x = 1; x < width-1; x++){
        p = x+y*width;
        if(v[p] != 0 && v[p-width] != 0 && v[p+width] != 0 && v[p-width-1] != 0 && v[p+width+1] != 0){
            u[x+y*width] = 255;
        }else{
            u[x+y*width] = 0;
        }
    }
}

for(y = 1; y < height-1; y++){
    for(x = 1; x < width-1; x++){
        setPixel(x, y, u[x+y*width]);
    }
}


###External Gradient
height = getHeight();
width = getWidth();

v = newArray(width*height);

for(y = 1; y < height-1; y++){
    for(x = 1; x < width-1; x++){
        if(getPixel(x,y) == 0 && getPixel(x-1,y-1) == 0 && getPixel(x+1,y+1) == 0 && getPixel(x-1,y+1) == 0 && getPixel(x+1,y-1) == 0){
            v[x+y*width] = 0;
        }else{
            v[x+y*width] = 255;
        }
    }
}

u = newArray(width*height);

for(y = 1; y < height-1; y++){
    for(x = 1; x < width-1; x++){
        p = x+y*width;
        if(v[p] == 0 || getPixel(x,y) == 255){
            u[p]=0;
        }else{
            u[p]=255;
        }
    }
}

for(y = 1; y < height-1; y++){
    for(x = 1; x < width-1; x++){
        setPixel(x, y, u[x+y*width]);
    }
}