Hi Hans, On Saturday 16 Jul 2016 10:19:29 Hans Verkuil wrote: > On 07/15/2016 08:11 PM, Laurent Pinchart wrote: > > On Friday 15 Jul 2016 18:13:15 Ricardo Ribalda Delgado wrote: > >> Describe the HSV formats > >> > >> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@xxxxxxxxx> > >> --- > >> > >> Documentation/media/uapi/v4l/hsv-formats.rst | 19 ++ > >> Documentation/media/uapi/v4l/pixfmt-packed-hsv.rst | 253 +++++++++++++++ > >> Documentation/media/uapi/v4l/pixfmt.rst | 1 + > >> Documentation/media/uapi/v4l/v4l2.rst | 5 + > >> 4 files changed, 278 insertions(+) > >> create mode 100644 Documentation/media/uapi/v4l/hsv-formats.rst > >> create mode 100644 Documentation/media/uapi/v4l/pixfmt-packed-hsv.rst > >> > >> diff --git a/Documentation/media/uapi/v4l/hsv-formats.rst > >> b/Documentation/media/uapi/v4l/hsv-formats.rst new file mode 100644 > >> index 000000000000..f0f2615eaa95 > >> --- /dev/null > >> +++ b/Documentation/media/uapi/v4l/hsv-formats.rst > >> @@ -0,0 +1,19 @@ > >> +.. -*- coding: utf-8; mode: rst -*- > >> + > >> +.. _hsv-formats: > >> + > >> +*********** > >> +HSV Formats > >> +*********** > >> + > >> +These formats store the color information of the image > >> +in a geometrical representation. The colors are mapped into a > >> +cylinder, where the angle is the HUE, the height is the VALUE > >> +and the distance to the center is the SATURATION. This is a very > >> +useful format for image segmentation algorithms. > >> + > >> + > >> +.. toctree:: > >> + :maxdepth: 1 > >> + > >> + pixfmt-packed-hsv > >> diff --git a/Documentation/media/uapi/v4l/pixfmt-packed-hsv.rst > >> b/Documentation/media/uapi/v4l/pixfmt-packed-hsv.rst new file mode 100644 > >> index 000000000000..b297aa4f7ba6 > >> --- /dev/null > >> +++ b/Documentation/media/uapi/v4l/pixfmt-packed-hsv.rst > >> @@ -0,0 +1,253 @@ > >> +.. -*- coding: utf-8; mode: rst -*- > >> + > >> +.. _packed-hsv: > >> + > >> +****************** > >> +Packed HSV formats > >> +****************** > >> + > >> +*man Packed HSV formats(2)* > >> + > >> +Packed HSV formats > >> + > >> + > >> +Description > >> +=========== > >> + > >> +The HUE (h) is meassured in degrees, one LSB represents two degrees. > > > > Is this common ? I have a device that can handle HSV data, I need to check > > how it maps the hue values to binary, but I'm pretty sure they cover the > > full 0-255 range. We would then have to support the two formats. Separate > > 4CCs are an option, but reporting the range separately (possibly through > > the colorspace API) might be better. Any thought on that ? > > It's either a separate 4cc or we do something with the ycbcr_enc field > (reinterpreted as hsv_enc). I'm not sure, I would have to think some more > about that. I'm inclined to use the ycbcr_enc field, especially given that a similar usage could be useful for RGB as well (don't ask me what it's supposed to be used for, but I have hardware that support limiting the RGB values range to 16-235). -- 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
