Re: Image processing by pixel range

[Rishi Bedi]

Thanks, that's exactly what I needed -- one other thing, does Octave
natively support image retrieval from a USB webcam?



On Mon, Jul 26, 2010 at 1:10 AM, Andy Buckle <address@hidden> wrote:
> On Mon, Jul 26, 2010 at 1:29 AM, Rishi Bedi <address@hidden> wrote:
>> Hi,
>> I'd like to use Octave to process an image from my FireWire webcam --
>> essentially, what I want to do is convert the image to black and white
>> and then test the color of a small range of pixels (they'll be in the
>> same place for every image, and will either be 100% black or 100%
>> white). I'm going to use im2bw for the conversion, but I was trying to
>> figure out what to do for the second part. Is there a way to use the
>> bwarea function on only a specified x,y range? -- or, if not, what
>> would you suggest to accomplish this?
>
> Index your image array.
>
> bwarea(im(y1:y2,x1:x2))
>
> (check I got the x and y the right way round! its been a while since I
> have worked on images myself in Octave)
>
> --
> /* andy buckle */
>