On Fri, Oct 28, 2016 at 1:40 PM, Marek Vasut <marex@xxxxxxx> wrote: > On 10/28/2016 10:30 PM, Devin Heitmueller wrote: >> Hi Matt, >> >>> Need some input for the video pixel data types, which the device we >>> are using (see datasheet links below) is outputting pixel data in >>> little endian 16-bit of which a 12-bits signed value is used. Does it >>> make sense to do some basic processing on the data since greyscale is >>> going to look weird with temperatures under 0C degrees? Namely a cold >>> object is going to be brighter than the hottest object it could read. >>> Or should a new V4L2_PIX_FMT_* be defined and processing done in >>> software? Another issue is how to report the scaling value of 0.25 C >>> for each LSB of the pixels to the respecting recording application. >> >> Regarding the format for the pixel data: I did some research into >> this when doing some driver work for the Seek Thermal (a product >> similar to the FLIR Lepton). While it would be nice to be able to use >> an existing application like VLC or gStreamer to just take the video >> and capture from the V4L2 interface with no additional userland code, >> the reality is that how you colorize the data is going to be highly >> user specific (e.g. what thermal ranges to show with what colors, >> etc). If your goal is really to do a V4L2 driver which returns the >> raw data, then you're probably best returning it in the native >> greyscale format (whether that be an existing V4L2 PIX_FMT or a new >> one needs to be defined), and then in software you can figure out how >> to colorize it. > > All true, I also did my share of poking into SEEK Thermal USB and it is > an excellent candidate for a V4L2 driver, that one. But I think this > device here is producing much smaller images, something like 8x8 pixels. Yes this is only 64 pixel (8x8 grid) but it is video still. Does have some major pluses over a FLIR camera though, mainly power usage is really low, and cost is lower (although that reason is decreasing everyday). > > -- > Best regards, > Marek Vasut -- 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
