imbinarize function do not work im2bw also does not work

ı am trying to get an image in the binary form but the funtions for it doesn't work.

ı tried both imbinarize and im2bw.

I = imread('a.png');

BW = im2bw(I, 0.4);

figure

imshow(I)

Answer 1

[KALYAN ACHARJYA]

I  = rgb2gray(imread('a.png'));
BW = im2bw(I, 0.4);

[Ahsen Cakmakci]

ı copied excactly the text you proposed but ı got this error mesage

[KALYAN ACHARJYA]

Please change the other image file and do verify?

Can you share the code and error message in larger texts (The image above is not visible)?

[Ahsen Cakmakci]

I = rgb2gray(imread('a.png'));

BW = im2bw(I, 0.4);

figure

imshow(BW)

error message

'im2bw' requires Image Processing Toolbox.

Error in a (line 2)

BW = im2bw(I, 0.4);

the thing is ı tried installing image processing toolbox but ı couldn't and gotten a message that says something unexpected occured. ı tried a copule of times and yet nothing changed.

[KALYAN ACHARJYA]

Just type ver in the command window, then enter, it shows all Toolboxes installed, is their Image Processing Toolbox, please confirm?

>>ver

[Ahsen Cakmakci]

there isn't.

[KALYAN ACHARJYA]

Because all images functions are in image processing toolbox, this is the reason it showing the error. You have to install image processing toolbox or use Matlab platform in other system which already have image processing toolbox installed.

[Ahsen Cakmakci]

ı am so sorry for bothering so much but as ı have said before ı cannot install it when ı try ı get an error that says something unexpected happened.

[Zarwish Javaid]

how to install image processing toolbox?

and how to remove errors shown in below image?