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int k = 1;
void setup() {
size(512, 256);
}
void draw() {
PImage img = loadImage("lena.png");
img.resize(256, 256);
img.filter(GRAY);
image(img, 0, 0);
image(minimum(img, k), 256, 0);
}
void keyPressed() {
if (key == '+') {
k++;
} else if (key == '-') {
k--;
}
}
PImage minimum(PImage I, int n) {
PImage out = createImage(I.width, I.height, RGB);
int off = n/2;
for (int x = 0; x < I.width; ++x) {
for (int y = 0; y < I.height; ++y) {
PImage t = I.get(x-off, y-off, n, n);
float[] tarr = new float[n*n];
t.loadPixels();
for (int i = 0; i < t.pixels.length; ++i) {
tarr[i] = red(t.pixels[i]);
}
out.set(x, y, color(min(tarr)));
}
}
return out;
}
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