On Friday 08 November 2013 13:40:57 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
>
> 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>
Got it working here but one question remains. The aspect ratio is locked,
and I would like to have a squarer image so it would better fit the
backplot window while maintaining a square pixel. Can it be unlocked?
Thanks.
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)
Most people need some of their problems to help take their mind off
some of the others.
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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