What you have described sounds interesting. You must understand I see many, many attempts at raster to vector conversion that are more or less failure and useless. It's still going to be an "I'll believe it when I see it" situation here, but good luck with your project and I hope you produce something viable :)
On Wed, Nov 21, 2012 at 3:17 PM, Joe Doll <[email protected]>wrote: > ** > > > Hi Marty, > > A picture is data from a sensor. In this case, the sensor is a camera. > The sensor is far from perfect. A picture that is supposed to have 3 > colors could easily be more than 15,000 colors. The data that has value > from any picture is call the signal and everything else is called noise. > For example, if we are trying to see an animal in the forest, the dots > belonging to the animal contain the data (and a lot of noise), and all > other dots are called noise. I'm not speaking down to you, I'm just > giving you some background information. > > Color grouping (aka color segmentation) and shape grouping are noise > suppression techniques that eliminate most of the noise in an image. > When the noise is reduced, SVG becomes much more efficient. > > No information (signal) can be extracted from a picture unless two or > more dots are constellated into a group. In graphics (from machine > vision I think), this is called a blob. > > It is immaterial whether the dots in a blob have different colors. As > humans, we group by colors. In other words, if the data is not > constellated by color, then we can't see it. Each group has one color. > In SVG, a path is closed around a blob and filled with a single color. > > When a photograph is converted to SVG, everyone does color grouping. > Most color groupers rely on frequency analysis or averaging techniques. > These techniques produce file sizes that are about 15 times larger than > a JPG, and they look much worse. It is all about signal to noise > extraction. At our company, we use a much more involved color grouping > process, and for that effort we can color group well enough that our > files are about 1.5 times larger than SVG and they are somewhat > comparable to JPG. > > We haven't added shape grouping, yet, but that would reduce the noise > further which would allow us to produce SVG which has a smaller file > size than JPG. > > Shape grouping is explained in my previous E-mail. When shape grouping > uses geographic shapes as the objective (we call this entropic > compression), then we can do about 10 times better than JPG, and the > quality is higher than JPG. > > More compression can be obtained by organizing the mathematical > representation, but I will leave that for later. > > > [Non-text portions of this message have been removed] ------------------------------------ ----- To unsubscribe send a message to: [email protected] -or- visit http://groups.yahoo.com/group/svg-developers and click "edit my membership" ----Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/svg-developers/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
