All,
You can even handle affine transformations if you can find software to do
Geometrical Indexing/Hashing (see Wikipedia).
Generally, the classic methods also only work well for cases wth no
occlusion, fairly good image quality, minimal in class variation, and small
numbers of classes.
David Webtser
On Mon, Jan 11, 2010 at 11:54 AM, Gluender <
[hidden email]> wrote:
> mat2e,
>
> the thing is that if you only have to deal with shifts, rotations and
> scale-changes, then there exist "classic" methods for matching 2D-objects.
> If you have to deal with affine transformations or, even worse, with
> distortions, then the task is less easy and in most cases not uniquely to
> solve.
>
> In your previously shown images the rotation was considerable but I
> couldn't realize any distortions.
>
>
> Hi Gluender-3,
>>
>> imagine the text being written on a piece of paper and you take a photo of
>> that (you intend to take a photo of the text). It will for sure be a
>> little
>> rotated, a little distorted and so on but it should not be extremely
>> transformed.
>>
>> Thanks,
>>
>> mat2e (It just occured to me as you said it, that the name fits in here
>> quite well...)
>>
>>
>> Gluender-3 wrote:
>>
>>>
>>> > mat2e (BTW great name),
>>
>>>
>>> I understand that you want to know if a given
>>> text is present in an image. However, the text in
>>> general appears being geometrically transformed
>>> in the image.
>>>
>>> Could you be more specific about the kind of
>>> transformations (Shifts, Rotations,
>>> Scale-Changes, Distortions...) that may occur?
>>>
>>> Hi all,
>>>>
>>>> I`m facing a problem that sounds pretty easy but it doesn´t seem to be.
>>>> I
>>>> want to find an object (in this example a static text) in an image and
>>>> rotate, transform it so that it looks like the original. The Text may
>>>> vary
>>>> in color or greyscale, but the outlines are stable.
>>>>
>>>> I habe two example images where this
>>>>
http://n2.nabble.com/file/n4282555/pic.png>>>> is the image containing the text I´m looking for and this
>>>>
http://n2.nabble.com/file/n4282555/template.png>>>> is the template.
>>>>
>>>> Is there any plugin or a set of plugins which could do the job? I´ve
>>>> read
>>>>
>>> a
>>
>>> lot of stuff on wikipedia but it´s hard to find a good starting point.
>>>> The
>>>> template mapping plugin I´ve tried doesn´t get me there.
>>>>
>>>> Thanks for any advice,
>>>>
>>>> mat2e
>>>>
>>> >>--
>> >
>> > --
>> > Herbie
>>
>>>
>>> ------------------------
>>>
>> > <
http://www.gluender.de>
>>
>
> Best
> --
>
> Herbie
>
> ------------------------
> <
http://www.gluender.de>
>
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