> I am a student working on a project about doorplate recognation.now I
> have no idea about how to segment the doorplate from the door image.
> Hope somebody give me some suggestion,
> Many thanks!
You can use some prior knowledge about the location of doorplates.
Investigate the region that is most likely to contain the doorplate and
identify patterns such as rounded objects, rectangles and symmetries. Then,
you might want to search for finer details that charcaterise a doorplate to
conform you have segmented the correct object. Either way, use a top-down
approach, forming some hypothesis and then trying to match it to your
region of interest.
> By the way, how can I post a picture in the topic?
If you are referring to attaching an image to this message, you can't. Not
only will Google Groups not allow you to do so, but also
attachments/HTML-formatted messages are adverse to netiquette.