On Friday 08 November 2013 12:23:30 Russell Brown did opine:
> Quoth Russell Brown..... (yes it's bad form following up my own post.
> Sorry)
>
> >But quite what you do with convert_crop.so once it's copied to
> >/usr/lib/camunits I don't know.
>
> Aha! You stick it in the chain directly after the V4l2 bit and in
> camview (the standalone utility) you can move the slider to crop the
> image (or edit the ratio in camviewcfg) and everything after that in the
> chain seems to operate on the cropped image. Works for me anyway.
>
> Playing with the cropping looks very hopeful.
>
> Here's a couple of screen-scrapes. Both with the USB Microscope ~300mm
> from the rule, hanging in mid-air from it's cable and very rough
> focusing.
>
> The first is with no-cropping and it's just about useless for edge
> finding on a mill.
>
> http://ruffle.me.uk/cnc-pics/snapshot1.png
>
> Cropping the image centre down to 110x82 pixels produces this:
>
> http://ruffle.me.uk/cnc-pics/snapshot2.png
That is exactly what I want!
>
> Which should get me to within a gnats of 'close enough' :-) and I
> thought I was going to have to get all complex with lenses and
> arithmetic and science!
>
>
> Now I just have to make a tweakable mount and try to figure out how I
> can persuade camview-emc to include the cropping slider in it's controls
> section within Axis so I can twiddle when it's being used for real.
>
> FWIW, the camera used above is a Supereyes TE24S 1-400X 5Mp selected on
> the highly selective and technical basis of being a random pre-loved
> cheapy on EBay that wasn't too bulky (it's a ~15mm diameter tube). I
> think that I'll have to hot-gloop the focus slider once it's bolted down
> and jog Z for fine adjustments.
>
>
> PS: For the record, here's my camviewcfg file (using little 640x480
> endoscope camera) showing util.crop's position in the chain:
>
>
> <?xml version="1.0" encoding="utf-8" ?>
> <chain>
> <unit id="input.v4l2:0" width="640" height="480"
> pixelformat="CAM_PIXEL_FORMAT_RGB" format_name="640x480 RGB 24bpp">
> <control id="input">0</control>
> <control id="standard">0</control>
> <control id="brightness">111</control>
> <control id="contrast">42</control>
> <control id="saturation">33</control>
> <control id="hue">-1</control>
> <control id="auto-white-balance">1</control>
> <control id="gamma">220</control>
> <control id="gain">3</control>
> <control id="control-9963800">1</control>
> <control id="control-9963802">4650</control>
> <control id="control-9963803">2</control>
> <control id="control-9963804">0</control>
> <control id="control-10094849">3</control>
> <control id="control-10094850">166</control>
> </unit>
> <unit id="util.crop" width="234" height="175"
> pixelformat="CAM_PIXEL_FORMAT_RGB" format_name="234x175 RGB 24bpp">
> <control id="ratio">0.366534</control>
> </unit>
> <unit id="convert.to_rgb8" width="234" height="175"
> pixelformat="CAM_PIXEL_FORMAT_RGB" format_name="234x175 RGB 24bpp">
> </unit>
> <unit id="output.opengl" width="234" height="175"
> pixelformat="CAM_PIXEL_FORMAT_RGB" format_name="234x175 RGB 24bpp">
> </unit>
> <unit id="emc.halio" width="234" height="175"
> pixelformat="CAM_PIXEL_FORMAT_RGB" format_name="234x175 RGB 24bpp">
> <control id="limit">3</control>
> <control id="reload">0</control>
> <control id="circle">video.circle</control>
> <control id="axis-pins">halui.axis.%d.pos-feedback</control>
> <control id="axis-letters">012345678</control>
> <control id="axis-format">%.3f</control>
> <control id="spacing">44</control>
> <control id="color-r">1</control>
> <control id="color-g">1</control>
> <control id="color-b">1</control>
> <control id="gl-xor">1</control>
> </unit>
> <unit id="emc.crosshair" width="234" height="175"
> pixelformat="CAM_PIXEL_FORMAT_RGB" format_name="234x175 RGB 24bpp">
> <control id="enable">1</control>
> <control id="color-r">1</control>
> <control id="color-g">1</control>
> <control id="color-b">1</control>
> <control id="gl-xor">1</control>
> <control id="circle-radius">104</control>
> <control id="circle-angle">0</control>
> <control id="shape">1</control>
> </unit>
> </chain>
Thanks for that cfg file. I might be able to cobble up my own version now,
thanks. I had a hell of a time getting it (the camunits.so stuffs) to show
up in an ldconfig -v output but finally did.
I also fixed what I thought was the signedness error in filter_hsv.c, by
removing a superfluous space between one instance of * super, where all the
others were *super, but that made no differences in the build errors.
Now, to use the best resolution the v4l library actually understands, I'm
gonna go pester the usb list to see what the best usable resolution might
be, since libv4lconvert knows zip about any formats above 1600x892,
compressed or otherwise. One table in the lsusb -v output says
wWidth 2304
wHeight 1536
It may have even better than that, but lsusb starts reporting invalid data
errors. 1600x892 looks decent enough but if I can, I'd like to use every
pixel it has.
Progress report this evening maybe, its about time to go find a nose bag &
feed these two old horses.
Cheers, Gene
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Anoint, v.:
To grease a king or other great functionary already sufficiently
slippery.
-- Ambrose Bierce, "The Devil's Dictionary"
A pen in the hand of this president is far more
dangerous than 200 million guns in the hands of
law-abiding citizens.
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