The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » Software » comp.soft-sys.matlab

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: Matlab-histogram and read pic
Replies: 4   Last Post: Aug 6, 2013 11:57 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Nasser Abbasi

Posts: 6,677
Registered: 2/7/05
Re: Matlab-histogram and read pic
Posted: Aug 6, 2013 8:17 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

On 8/6/2013 2:34 AM, wrote:
> Hello all
> I have a sample question
> For ex you read a pic with imread after that imread return its output to the
> Img_Data variable then you use this code
> Img_Data=Img_Data(:,:,1);
> What's the meaning of (:,:,1)

first channel. The values of the 'R' in the RGB image.
a matrix of 2D.

>and can help me about ':' what's the meaning of ':'?

If you do not know what : is, you really should be reading
documenation. It means all elements in that index position.
So A(:) means all entries in A, regadless of A dimensions.
A(:,1) means all rows, first column. i.e. picks the first
column out. etc..

> About get RGB histogram plz get some tips to me with sample code.
> Thanks all

help image. It is all there. all what you have to do is read a little
and look at the examples.

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.