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. -- Best regards, Marek Vasut
