2009/4/5 Jean-Francois Moine <moinejf@xxxxxxx>: > On Sat, 04 Apr 2009 22:22:19 +0200 > Erik Andrén <erik.andren@xxxxxxxxx> wrote: > [snip] >> When flipping the image horizontally, vertically or both, the sensor >> pixel ordering changes. In the m5602 driver I was able to compensate >> for this in the bridge code. In the stv06xx I don't have this >> option. One way of solving this problem is by changing the >> pixelformat on the fly, i. e V4L2_PIX_FMT_SGRB8 is the normal >> format. When a vertical flip is required, change the format to >> V4L2_SBGGR8. >> >> My current understanding of libv4l is that it probes the pixelformat >> upon device open. In order for this to work we would need either >> poll the current pixelformat regularly or implement some kind of >> notification mechanism upon a flipping request. >> >> What do you think is this the right way to go or is there another >> alternative. > > Hi Erik, > > I saw such a problem in some other webcams. When doing a flip, the > sensor scans the pixels in the reverse order. So, > R G R G > G B G B > becomes > B G B G > G R G R > > The solution is to start the scan one line lower or higher for VFLIP > and one pixel on the left or on the right for HFLIP. > As I wrote in my original email I haven't found out a way to adjust this when using the vv6410 sensor. > May you do this with all the sensors of the stv06xx? This issue is vv6410 specific. Best regards, Erik Andrén > > Cheers. > > -- > Ken ar c'hentan | ** Breizh ha Linux atav! ** > Jef | http://moinejf.free.fr/ > -- 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
