Re: Image processing

[Erika Bueno]

Guys, I got a 423x425 matrix (that's the size of the image), but I
just can't work with this matrix. I can't make any operation and any
kind of reshaping to make operations. Any suggestion?

Thanks! :)

2010/6/11 Erika Bueno <address@hidden>:
> Got it, thanks :)
>
> And what if there's no third number? Do I have to assume anything special?
>
> 2010/6/11 Moo <address@hidden>:
>> Erika - the third number is the third "dimension" of the image, which is
>> number of channels in your image.  So for example, in a greyscale image or
>> an indexed image the number should be 1.  In some color images (it has to do
>> with the file format; .jpg, .png, etc), the third number is 3, indicating
>> red, green, and blue (RGB) channels.  The only other number you might see is
>> 4, indicating cyan, yellow, magenta, black (CMYK) channels.
>>
>> Keep in mind that, depending on what you're actually doing to "compare" the
>> images, you might have to take that into account.  I can't go into the
>> details, but if you know specifically what you're going to do I could
>> probably help.
>>
>> On Fri, Jun 11, 2010 at 2:30 PM, Erika Bueno <address@hidden> wrote:
>>>
>>> I made what you explained with a GIF image and when I use size(myimg),
>>> it shows three numbers. The first and the second are rows and columns,
>>> what is the third number?
>>>
>>> Thanks again :)
>>>
>>> 2010/6/9 Erika Bueno <address@hidden>:
>>> > Thanks, Soren! I'm gonna try this in the morning, when I get to the
>>> > lab and I'll tell you if I got it :)
>>> >
>>> > Good night! :)
>>> >
>>> > 2010/6/9 Søren Hauberg <address@hidden>:
>>> >> ons, 09 06 2010 kl. 02:39 -0300, skrev Erika Bueno:
>>> >>> I'm gonna try :)
>>> >>>
>>> >>> I read the image, just like you explained me to do. It works.
>>> >>>
>>> >>> I know the image is saved in the variable "i" as a matrix, right?
>>> >>>
>>> >>> Ok. But I don't know the size of the matrix. So, how can I work with
>>> >>> something that I don't know its extension?
>>> >>>
>>> >>> My project is to read a couple of images and, then, compare then. To
>>> >>> do this, I gotta read the images and work with its variables as
>>> >>> matrices.
>>> >>>
>>> >>> Got it now? :)
>>> >>
>>> >> Yes I think I got it, thanks :-)
>>> >>
>>> >> To get the size (or extension as you call it), simply call
>>> >>
>>> >>  size (I)
>>> >>
>>> >> this will be a vector with the number of rows in the image on the first
>>> >> place and the number of columns in the second place.
>>> >>
>>> >> Søren
>>> >>
>>> >>
>>> >
>>>
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>>
>>
>