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How much data is the Javascript collecting, compared with other "web
drawing" applications?
You need what?
a) x and y of point
b) pen pressure
c) id of previous point
That would be the "bitmap" way of doing it, and that is "only double"
the normal number of bytes.
You could also do a vector:
a) x and y of point
b) pen pressure
c) vector
d) stroke length
e) id of previous point (if continuous stroke)
but I think, with delicate handwriting, the bitmap way is probably better.
You have to collect the pen data, because that is how Handwriting
recognition figures out the letters (and why, without the stroke
information, it is so hard to do standard OCR on handwriting after the
fact).
- - Scott
Ken Elliott wrote:
> The number of vectors needed to represent handwriting is huge. It would
> help to use something like NURBS to reduce the data size, but that requires
> yet another transformation. If you use a raster "canvas", then you need to
> map the mouse movements to the canvas. If the resolution of the canvas is
> low, the data is smaller, but you have a loss of the small details. Using a
> higher resolution canvas captures the details, but greatly increases the
> data size.
>
> This is why such applications are usually run locally. You have all the
> horsepower available to transform the handwriting into data. But Scott has
> a set of goals that make this approach undesirable to him.
>
> Like I said - this could be difficult. But I understand the attraction of
> the challenge.
>
>
> Ken Elliott
> =====================
>
> -----Original Message-----
> From: slug@nks.net [mailto:slug@nks.net] On Behalf Of Setheck
> Sent: Monday, June 22, 2009 6:17 PM
> To: slug@nks.net
> Subject: Re: [SLUG] Open Source handwriting recognition application?
>
> I understand an input device sends a stream of information, but why
> would you want the stream, instead, wouldn't you just want to use a
> web drawing canvas type app? If you could do it with vector graphics
> you would lose the problem with resolution. But that may open another
> can of worms.
>
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