Fill in Surrouding data

Hi,

I have a matrix with bit mask [0, 1]. Is there are quick way to fill surrounding 1 data with value 1.

For example, with

ttmp =

[0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 1 0 0 0 0

0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 1 0 0 0

0 0 0 1 0 1 0 0 0 0

];

I want to turn in into

ttmp2=

[0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 1 0 0 0 0

0 0 0 0 1 1 1 0 0 0

0 0 0 0 0 1 0 0 0 0

0 0 0 0 0 0 1 0 0 0

0 0 0 1 0 1 1 1 0 0

0 0 1 1 1 1 1 0 0 0]

Thanks much

Answer 1

[Dave B]

You could use conv2 with little kernel and then turn "overlapping" 2's into ones:

ttmp = [0   0   0   0   0   0   0   0   0   0
0   0   0   0   0   0   0   0   0   0
0   0   0   0   0   1   0   0   0   0
0   0   0   0   0   0   0   0   0   0
0   0   0   0   0   0   0   0   0   0
0   0   0   0   0   0   1   0   0   0
0   0   0   1   0   1   0   0   0   0]

ttmp = 7×10

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 1 0 0 0 0

<mw-icon class=""></mw-icon>

<mw-icon class=""></mw-icon>

tconv = conv2(ttmp,[0 1 0;1 1 1;0 1 0],'same')

tconv = 7×10

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 2 1 1 0 0 0 0 1 1 2 1 2 0 0 0

<mw-icon class=""></mw-icon>

<mw-icon class=""></mw-icon>

ttmp2 = double(tconv>0)

ttmp2 = 7×10

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 1 1 1 0 0 0 0 1 1 1 1 1 0 0 0

<mw-icon class=""></mw-icon>

<mw-icon class=""></mw-icon>

[Pete sherer]

thanks much