×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

# Image to Matrix (various size boxes)

## Image to Matrix (various size boxes)

(OP)
Hi all,

As my first post on the forums, I'd like to say Hi to all and thank you for your suggestions. I need to write a program which reads in an image (say bacteria) as a matrix, convert it to black and white and then sum up all the 1's (white pixels). Currently, Ive managed to do this, but what is also required is different size boxes (matrix cells) for analysis purposes (quite like a box-counting method). When I imread('surface0_2um.bmp') I have cropped off the unnecessary pixels I do not require. Therefore MATLAB saves it as a 600x400 matrix, where each pixel represents a cell. How can I make it so each cell is, say, 10x10 or 25x25 therefore the number of cells will change. My code at the moment is:

I2=imcrop(I,[0 0 600 400]);
I=I2;
background=imopen(I,strel('disk',40));
I2=imsubtract(I,background);
level=graythresh(I3);
bw=im2bw(I3,level);
bw=not(bw);
imshow(bw)
whos
sum(sum(bw))

Kind regards,

Danny

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!