import("mrfaustlib/fft.lib");
import("fft2d.dsp");

DILATION_MIN = 0;
EROSION_MAX = 255;

strel_shift_dilation = DILATION_MIN : vectorize(1);
strel_shift_erosion = EROSION_MAX : vectorize(1);

spray_by_three(n) = _ <: par(i, n, ([i], [i+1], [i+2]));

tri_max = max, _ : max;
tri_maxs(n) = par(i, n, tri_max);
tri_min = min, _ : min;
tri_mins(n) = par(i, n, tri_min);

dilating(n) = strel_shift_dilation, _, strel_shift_dilation : #, _ : # : spray_by_three(n) : tri_maxs(n) : nconcat(n);

eroding(n) = strel_shift_erosion, _, strel_shift_erosion : #, _ : # : spray_by_three(n) : tri_mins(n) : nconcat(n);

//dilation(size, iter) = seq(i, iter, dilating(size));
//erosion(size, iter) = seq(i, iter, eroding(size));

dilation_square(x, y) = _ : vectorize(y) : serialize : dilating(x) : vectorize(y) : matrix_transpose(y, x) : serialize : dilating(y) : vectorize(x) : matrix_transpose(x, y) : serialize;

dilations(x, y, iter) = seq(i, iter, dilation_square(x,y));

erosion_square(x, y) = _ : vectorize(y) : serialize : eroding(x) : vectorize(y) : matrix_transpose(y, x) : serialize : eroding(y) : vectorize(x) : matrix_transpose(x, y) : serialize;

erosions(x, y, iter) = seq(i, iter, erosion_square(x,y));

open(x, y, iter) = erosions(x, y, iter) : dilations(x, y, iter);
close(x, y, iter) = dilations(x, y, iter) : erosions(x, y, iter);

//process = dilation(112, 3);
//process = erosion(119, 10);
//process = opening(119, 10);
process = close(119, 123, 1);