>Hi Matto, Hey, Andrew, happy new year,
>I haven't had a chance to look at the code so I don't know how wide the >H-scaling filter can be. A filter can be as wide as it wants to be --- the code is quite general in that regard (hence not as fast as it could be for any given filter). > However, if you can do it a Lanczos kernel or >windowed sinc at 7 or 9 taps width is generally what is used professionally >(resources permitting). By that, do you mean "sinc, with a Lanczos window"? I can do that. (A Lanczos window is just the central lobe of a sinc (i.e., up to the first zero-crossing), right? Funny that "sinc times fat, trucated sinc" is the preferred kernel.) Hey, can you suggest any good references that explain, for example, why these choices are made for professional video? >V-scalers are usually narrower as video signals is not necessarily >band-limited in the vertical axis so a wide impulse response tends >to produce visible ringing in the vertical. Currently, the scaling engine uses the same kernel for both H and V (except when an axis is 1:1 with no subpixel translation, in which case it just does a copy). But it should be fairly easy to allow them to be set differently --- mostly paperwork. I'll put it on the TODO list. -matt m. ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
