mmdpcb
Decompose a printed circuit board in its main parts.

The binary image of a printed circuit board is read.

a = mmreadgray('pcb1bin.tif');

mmshow(a);

a

A new image is created by filling the holes. The input image is subtracted from this new image with holes. The resulting residues are the holes.

b = mmclohole(a);

holes = mmsubm(b,a);

mmshow(b);

mmshow(a, holes);

b	a, holes

The square islands are detected using an opening by a square of size 17x17.

c = mmopen(b,mmsebox(8));

square = mmcdil(c, a);

mmshow(b, c);

mmshow(holes, square);

b, c	holes, square

The circle islands are detected using an opening by an Euclidean disk on a residues image.

f = mmsubm(b, c);

g = mmopen(f, mmsedisk(8));

circle = mmcdil(g,a);

mmshow(f, g);

mmshow(holes, square, circle);

f, g	holes, square, circle

The rectangular islands are detected using an opening by a rectangle of size 25 x 8 on a residues image. The rectangle structuring element is built from the composition of vertical and horizontal lines.

i = mmsubm(f, g);

m = mmopen(i,mmsedil(mmseline(8,90), mmseline(25)));

rect = mmcdil(m,a);

mmshow(i, m);

mmshow(holes, square, circle, rect);

i, m	holes, square, circle, rect

The thick connections are detected using an opening by a square on a residues image.

o = mmsubm(i,m);

p = mmopen(o, mmsebox(2));

thin = mmcdil(p,a);

mmshow(o, p);

mmshow(holes, square, circle, rect, thin);

o, p	holes, square, circle, rect, thin

The thin connections are detected using an opening by a square on a residues image.

r = mmsubm(o,p);

s = mmopen(r, mmsebox);

thick = mmcdil(s,a);

mmshow(r, s);

mmshow(holes, square, circle, rect, thin, thick);

r, s	holes, square, circle, rect, thin, thick

The main components of the circuit are overlayed and presented in a single image.

mmshow(holes, square, circle, rect, thin, thick);

holes, square, circle, rect, thin, thick