SL Recognition system

Valerie Sutton sutton at SIGNWRITING.ORG
Tue Jan 28 17:04:05 UTC 2003

SignWriting List
January 28, 2003

Wayne and Michael -
Thank you for this information on Sign Language recognition research. I
had heard about such a "glove" appears there is ongoing
work on that project - my "hats off" to their courage! I know this is a
very hard area of research...

And thank you, Michael, for offering to volunteer your time for such a
project - I visited this web site... you suggested, and I
was impressed....

I am sure you are right about the accuracy of cameras - Viewing
movement on video is never perfect - Years ago we all thought that
spoken language recognition would never be great, and it is getting
better - so there is hope if current research projects continue...but
they are lacking one component - SignWriting...(smile)...

To be realistic, taking on such a new project would not be feasible
right now, for me or our nonprofit organization, but perhaps if the
ongoing researchers in this area would like to "add the SignWriting
component" to their projects...that would be the best way to go. I will
be glad to help if that is the case...

Val ;-)


On Wednesday, January 22, 2003, at 09:39 PM, Michael Golebiewski wrote:

> Here is another good link on the topic:
> There are a few interesting things to consider as one begins to look
> down this area, I started some initial research and pulled back a
> while ago.
> First off cameras are bound to be a little unreliable. To make
> microphones work there was significant research in noise reduction.
> This work has not been done, as I am aware, for visual recognition
> systems. Therefore, focusing on only the signer and not things in the
> background is likely to be a problem. If possible VR devices like
> gloves which can more precisely track movements without "noise" are
> likely to be more reliable in the near term.
> Second, AI approaches are likely to have better results. Recognition
> to "phonemes" (elements of a sign) and search based on that alone are
> not as likely to have good results.  Most speech recognition systems
> that have had greater success are based on neural networks for this
> reason.
> I am more than willing to talk offline more on what I have learned
> from my initial research. It is quite limited in the specific area of
> sign recognition. However, I have experience in very similar areas and
> have touched on this one.
> I am even willing to volunteer some time to help out if you seek to
> kick off such a product.
> ----- Original Message -----
> From: Wayne Smith
> Sent: Monday, January 20, 2003 9:37 PM
> Subject: SL Recognition system
> Valerie wrote:
> .....but wouldn't it be wonderful if we could sign something on a
> camera attached to the computer and it would turn it into written
> SignWriting? Is there "Sign Language Recognition Software" developed
> yet? I know people are working on it...if so then later we could try
> to coordinate it with SignWriting.
> Well, I know of one project something like that in Taiwan.  Here's an
> abstract of the dissertation of one Liang Rung-huei (whom I don't
> know) who appears to be doing just that.
>         - Wayne
> -----------------------------------------------
> A Real-time Continuous Gesture Recognition System for
> Taiwanese Sign Language
> Student:  $BNBMF51 (B Advisor:  $B]?M[L@ (B
>  $BT"N)gJ_TBgU\;q?V9)DxU\8&5f=j (B
> Abstract
> In this dissertation, a sign language interpreter is built for
> Taiwanese Sign Language (TWL). This system is based on the fundamental
> vocabularies and training sentences in the text book of sign language
> used by the first grade of elementary schools in Taiwan. An
> instrumented glove, VPL $B!G (Bs DataGlove, is used in the system to capture
> hand configurations for real-time recognition with statistical
> approach. The major contributions of the proposed system are: (1) it
> solves the important end-point detection problem in a stream of hand
> motion and thus enables real-time continuous gesture recognition; (2)
> this system is the first one to take a full set of sign language into
> consideration, instead of focusing on a small set or a self-defined
> set of gestures; (3) this is the first system that aims at automatic
> recognition of Taiwanese Sign Language (TWL). To meet the requirements
> of large set of vocabularies in sign language and to overcome the
> limitations of current technologies in gesture recognition, three
> concepts in statistical language learning are proposed: segmentation,
> hidden Markov model, and grammar model. Segmentation is done by a
> strategy of monitoring time-varying parameters. Hidden Markov models
> are built for each sub-gesture model, and a bigram scheme is applied
> to adjacent gestures. Each gesture is decomposed into four sub-gesture
> models: posture, position, orientation, and motion. In TWL, there are
> 51 fundamental postures, 22 basic postions, 6 typical orientations,
> and about 5 motion types. The system uses posture sequence as a stem
> of input gestures and then sub-gesture models are recognized
> simultaneously. We have implemented a system that includes a lexicon
> of 250 vocabularies, and 196 training sentences in Taiwanese Sign
> Language (TWL). This system requires a training phase of postures for
> each user. Hidden Markov models (HMMs) for 51 fundamental postures, 6
> orientations, and 12 motion primitives are implemented. The
> recognition rates are 95%, 90.1%, and 87.5%, for posture, orientation,
> and motion models respectively, and the recognition rate of an
> isolated gesture is 82.8% and becomes 94.8% if the decision is within
> top three candidates. A sentence of gestures based on these
> vocabularies can be continuously recognized in real-time and the
> average recognition rates of inside tests are 75.1% for phrases (in
> average 2.66 gestures per sentence) and 82.5% for sentences (in
> average 4.67 gestures per sentence). However, if top three candidates
> are taken into account, the recognition rates described above are
> 82.5% and 86.4%, and the average recognition rate is 84.6%.

-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: text/enriched
Size: 7512 bytes
Desc: not available
URL: <>

More information about the Sw-l mailing list