Re: Proposed Implementation for the Visual Magnifier Addition

[Patricia Santana Cruz <patriciasantanacruz gmail com>]

Hei,

regarding all the design changes, I would recomend you to ask on IRC
in the #gnome-design channel on GimpNet. They will guide you properly
with them.

Good luck with the project!
Patricia.

2011/11/23 Matthew Brush <mbrush codebrainz ca>:
> Hi,
>
> Sounds interesting!
>
> You could also write all of your video transformation/filtering code as a
> GStreamer plugin so it can be reused in other GStreamer programs.  You could
> then use Cheese's GTK+/GStreamer interfaces to control the plugin's
> properties.
>
> Or, you could just whip up a simple standalone GTK+/GStreamer application in
> not very lines of code to create a GStreamer pipeline with your "magnifier"
> element in it.
>
> I actually wrote a small program[1] for fun that serves a similar purpose
> after I saw this[2]. It's a standalone application rather than being
> integrated into/with Cheese/GStreamer (it uses OpenCV), but you might find
> some of the video-related code interesting anyway.
>
> Cheers,
> Matthew Brush - Random cheese-list lurker
>
> [1] https://github.com/codebrainz/digimag
> [2] http://petrahele.webnode.cz/news/assistive/
>
>
> On 11/17/2011 02:55 PM, David Descoteaux wrote:
>>
>> To all,
>>
>> Greetings again from the Western New England University students. We
>> have reached a proposed implementation for the visual magnifier
>> functionality to Cheese based on the GNOME human interface guidelines
>> and our understandings of Cheese and GStreamer. Attached is the
>> completed Software Design Specification of our proposed implementation.
>>
>> Our project's dokuwiki on the SoftHum website can be foundhere
>> <http://xcitegroup.org/softhum/doku.php?id=s:cheesemagnifier:project>.
>>
>> To Summarize:
>> -We plan to add a new drop-down menu to the main window of Cheese
>> labeled "UAC" that will contain the visual magnifier filters and red
>> guideline switches.
>>
>> -The filters themselves would be implemented as new CheeseEffects
>> (accessible only through the previously described menu if need be) that
>> would utilize GStreamer to modify the image stream from the webcamera to
>> the high-contrast foreground/background filters the customer requested.
>>
>> -The horizontal red guideline, we are certain that we would implment as
>> a CheeseEffect as well. However, we aren't certain if priorities of
>> effects, or layers, could be implemented from either GStreamer's
>> documentation or Cheese's. As the line needs to remain above, or redrawn
>> on top of any other applied effect we plan to implement.
>>
>> As far as we have been able to piece together from the documentation and
>> code of both packages, we have this as our basis of thought:
>> CheeseEffects utilize GStreamer pipeline filters and a few of the
>> plugins (In the case of the "Dice" Effect there is a "dicetv" plugin
>> under the gst-plugins-good package) to manipulate the incoming video
>> feed from a webcamera. However, tracing through Cheese's code hasn't
>> provided a source apart from an enumerated list of strings that mention
>> a few effects, so these are all best guesses about how the effects are
>> actually created and used.
>>
>> The private API within Cheese has been a massive boon to the project
>> (Thanks, again Amigadave for telling us how to generate that), but we
>> would like some confirmation as to whether or not this is how things
>> actually work within the program.
>>
>> The proposed implementation can be modified if the ideas are either
>> incorrect, or not in line with how the project is currently progressing.
>> Any form of input or criticism is appreciated.
>>
>> Thanks in advance,
>> David "Biomech360"
>>
>>
>>
>> _______________________________________________
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>> http://mail.gnome.org/mailman/listinfo/cheese-list
>
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