> The only way that a measured movement > of the body can be translated to > offsets at the focal plane is if the > lenses FL is known.
I understand what you are saying, and you may be right. But you may also be wrong. You simply can't _know_ that there is no way around that problem. Tim Mostly harmless (just plain Norwegian) Never underestimate the power of stupidity in large crowds (Very freely after Arthur C. Clarke, or some other clever guy) > -----Original Message----- > From: Rob Studdert [mailto:[EMAIL PROTECTED] > Sent: 4. januar 2006 15:01 > To: [email protected] > Subject: RE: A10: Pentax Image Stabilization is here > > On 4 Jan 2006 at 12:16, Tim Øsleby wrote: > > > Knowing the FL makes it lot easier to make a IS system. But I do believe > it > > is possible to make a more "intelligent" solution. > > My idea is something like this: > > First it measures the camera movements, and makes a rough guess. Then a > > feedback system (based on data from the image sensor) tells the camera > how > > successful the first estimate was. Based on that information you will > have > > data for a better calculation. (A similar technique has been used with > some > > success in subwoofers in sound systems). > > Yes I've seen sub-woofer systems with accelerometers on their cones which > use a > a near real-time closed feedback system to reduce distortion but > unfortunately > we don't have such a direct mode of feedback when compensating for camera > shake. And even if we did the AS system would have to make assumptions > regarding subject relevance as does an AF system. > > > This is just my non expert speculations... > > What I'm trying to say is: We don't _know_ that a IS system needs the > FL, > > you are just assuming it. > > We do know it needs to know FL because the image being shot isn't being > monitored real time during the exposure. The only way that a measured > movement > of the body can be translated to offsets at the focal plane is if the > lenses FL > is known. > > > Rob Studdert > HURSTVILLE AUSTRALIA > Tel +61-2-9554-4110 > UTC(GMT) +10 Hours > [EMAIL PROTECTED] > http://members.ozemail.com.au/~distudio/publications/ > Pentax user since 1986, PDMLer since 1998 > >
