Hi! > > What is reasonable camera application for testing? > > > > N900 looks like a low-end digital camera. I have now have the hardware > > working (can set focus to X cm using command line), but that's not > > going to be useful for taking photos. > > I guess you already knew about omap3camd; it's proprietary but from purely > practical point of view it'd be an option to support taking photos on the > N900. That would not be extensible any way, the best possible functionality > is limited what the daemon implements. > > I'm just mentioning the option of implementing wrapper for the omap3camd so > that it can work with upsteam APIs, I don't propose that however. > > > > > In particular, who is going to do computation neccessary for > > autofocus, whitebalance and exposure/gain? > > I think libv4l itself has algorithms to control at least some of these. It > relies on the image data so the CPU time consumption will be high. > > AFAIR Laurent has also worked on implementing some algorithms that use the > histogram and some of the statistics. Add him to cc list. Ok, so I played a bit... and have something working. I modified fcam-dev to work with the current kernel, and removed most functionality in the process. Then I re-did sharpness and autogain computations in software, and it seems to work somehow... but its rather slow. (But good news is that's because code is stupid; the computations should be fast enough.) In particular, it takes cca 10 seconds to take a picture. I guess there's a room for improvement :-). > > There's http://fcam.garage.maemo.org/gettingStarted.html that should > > work on maemo, but a) it is not in Debian, b) it has non-trivial > > dependencies and c) will be a lot of fun to get working... > > > > (and d), will not be too useful, anyway, due to 1sec shutter lag: > > I believe this will be shorter nowadays. I don't remember the exact > technical solution which the text below refers to but I'm pretty sure it'll > be better with the current upstream. API-wise, there's work to be done there > (to port FCAM to upsteram APIs) but it's a possibility. So far I have really horrible hacks. Best regards, Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
