Hi Joshua, On Monday 26 March 2012 09:44:52 Joshua Hintze wrote: > On Mon, Mar 26, 2012 at 2:25 AM, Laurent Pinchart wrote: > > On Sunday 25 March 2012 23:13:02 Joshua Hintze wrote: [snip] > >> Now I'm working on fixing the white balance. In my office the > >> incandescent light bulbs give off a yellowish tint late at night. I've > >> been digging through the omap3isp code to figure out how to enable the > >> automatic white balance. I was able to find the private IOCTLs for the > >> previewer and I was able to use VIDIOC_OMAP3ISP_PRV_CFG. Using this IOCTL > >> I adjusted the OMAP3ISP_PREV_WB, OMAP3ISP_PREV_BLKADJ, and > >> OMAP3ISP_PREV_RGB2RGB. > >> > >> Since I wasn't sure where to start on adjusting these values I just set > >> them all to the TRM's default register values. However when I did so a > >> strange thing occurred. What I saw was all the colors went to a decent > >> color. I'm curious if anybody can shed some light on the best way to get > >> a high quality image. Ideally if I could just set a bit for auto white > >> balance and auto exposure that could be good too. > > > > The ISP doesn't implement automatic white balance. It can apply white > > balancing (as well as other related processing), but computing values for > > those parameters needs to be performed in userspace. The ISP statistics > > engine engine can help speeding up the process, but the AEWB algorithm > > must be implemented in your application. > > Dang, I'll have to look up some AEWB algorithms. I will publish sample code soon (likely in a couple of weeks, could be a bit before). > I'm curious why TI would have this register bit then (AEW_EN bit 15 in > H3A_PCR)? That bit enables the AEWB statistics collection, not an AEWB algorithm. > Is this the same for auto focus and auto exposure? Meaning that I'll need to > get information from the histogram/statistics to adjust focus and exposure > times? That's right. -- Regards, Laurent Pinchart -- 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
