Differences between version 2 and predecessor to the previous major change of OmniVisionWebCam.
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| Newer page: | version 2 | Last edited on Wednesday, October 5, 2005 10:38:43 am | by JohnMcPherson | Revert |
| Older page: | version 1 | Last edited on Wednesday, October 5, 2005 10:13:52 am | by IanMcDonald | Revert |
@@ -4,17 +4,12 @@
Unfortunately, these cameras serve images up in [JPEG] format only, and this behaviour will require application-level support. No webcam software for [Linux] seems to handle this (yet - at least for [V4L] version 1). The source code for the driver (linked above) comes with a small program that can grab and save [JPEG] images from the camera. JohnMcPherson has a modified version of this program that will display captured video in an X window -
grab the "showvideo" package from [our software archive|http://www.wlug.org.nz/archive/software/ov51x/].
-You can also code the decompression in the
[Kernel
] space! Take a look at the decompression for ov518: it is very very close to
[JPEG] decompression.
-But there are patents about [JPEG] decompression and
that is why - as far as I understand -
the module doesn't handle [JPEG]
decompression in [Kernel] space.
.
-But an individual that coded it
for himself (and his friends ;) ) would not have to fear those patents
... and
the ov519 would work anywhere no matter with what app!
+The
[LinuxKernel
] maintainers would not allow something like
[JPEG] decompression inside a kernel module.
.. they will argue (correctly)
that this
is something that should be done in userspace.
+However, this lets
the camera work with any video4linux program instead of only programs that do jpeg
decompression themselves
.
+One such driver is now available
for download from the following website: http://www
.rastageeks
.org/ov51x-jpeg/ - you will need
the following [Module]s loaded:
+* videodev
+* ov51x
+*
ov519_decomp
-One such driver is now available for download from the following website: http:
//www.rastageeks.org
/ov51x-jpeg
/
-
--- The [LinuxKernel] maintainers would not allow something like [JPEG] decompression inside a kernel module... they will argue (correctly) that this is something that should be done in userspace.
-
--- That is not totally correct. WebCam decompression is being done in kernel but the biggest obstacle has been (
and why it keeps coming out of
the LinuxKernel) is that code was not clean room. Also note about patents is not
correct - you can still be prosecuted as an individual - less likely but you still can. Having seen [JohnMcPherson]'s comment below it confirms my memory that the problem was people stealing code from Philips and not [JPEG] being the issue. IanMcDonald
-
--- [JPEG] is not a patent-encumbered format, [AFAIK]. JohnMcPherson
-
--- [JPEG] itself may not be patented - it is a rather common mathematical compression BTW, but the file format that uses that compression, the JFIFF is patented [AFAIK]
. Romain Beauxis
+You may need to use [UDev] to setup devices on <tt>
/dev
/video<
/tt> and <tt>
/dev/video0</tt>
and to set
the correct permission
.
