Convex Mirror

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Self Portrait in a Convex Mirror

GCODE

• Store home:

(storing home)
G90
G92 X47.0 Y47.0
M4

Tests

• draw a circle on blank image:
  • convert ~/Pictures/convex_mirror_storefront/work/blank.jpg -stroke White -fill none -strokewidth 1 -draw "circle 932, 932, 2, 932" ~/Pictures/convex_mirror_storefront/work/just_circle.png
• convert to pnm:
  • convert ~/Pictures/convex_mirror_storefront/work/just_circle.png ~/Pictures/convex_mirror_storefront/work/just_circle.pnm
• potrace to json:
  • potrace ~/Pictures/convex_mirror_storefront/work/just_circle.pnm -W 30.0 -H 30.0 -M 4.0 -i -a 0 -b geojson -s -o ~/Pictures/convex_mirror_storefront/work/just_circle.json
• json to text:
  • /json_to_txt.py ~/Pictures/convex_mirror_storefront/work/just_circle.json ~/Pictures/convex_mirror_storefront/work/just_circle.txt 0.1
• txt to nc:
  • ./render_gcode.py ~/Pictures/convex_mirror_storefront/work/just_circle.txt ~/Pictures/convex_mirror_storefront/work/just_circle.nc 5.0 5.0 1.0 100.0
• stream to plotter:
  • ./stream3.py ~/Pictures/convex_mirror_storefront/work/just_circle.nc /dev/tty.usbmodem1a1241

Workflow

RPi side

• OSX:
  • killall PTPCamera
• take photo on raspberry pi:
  • gphoto2 --capture-image-and-download --filename capt0004.jpg
• send to laptop:
  • scp capt0004.jpg rtwomey@192.168.2.1:~/Pictures/raspi
• USB reset device:
  • usbreset /dev/bus/usb/001/004

OS X side

• crop:
  • convert ~/Pictures/raspi/frame0001.jpg -crop 1450x1450+779+275 +repage square0001.jpg
• bg subtract:
  • python bgsubtract.py square0002.jpg square0008.jpg 20 2
• edge detect:
  • python edge.py square0001.jpg 20 255
• convert to pnm:
  • convert square0001_edge.png edge0001.pnm
• vectorize:
  • potrace edge0001.pnm --tight -i -s -o frame0001.svg
• send to gcode machine:

Helper script:

• python process_image.py ~/Pictures/raspi/frame0024.jpg
• produces frame0024.svg

Background Subtract

• subtract one image from background with given threshold and dilations:
  • python bgsubtract.py background.jpg square.jpg 66 10

Processing from commandline

• install processing-java from tools menu in processing
• run from command line:
  • processing-java --sketch=/Users/rtwomey/processing/dm_xml/convexmirror_cmdline --output=tmp/convexmirror --run --force
  • NOTE: all filenames in the app need full paths.
• run workflow with processing from commandline:
  • python bgprocessing.py ~/Pictures/raspi/frame0031.jpg

draw a circle

• add a circle to background:
  • convert background.jpg -stroke White -fill none -strokewidth 1 -draw 'circle 715,740 35,740' bgcircle.png

Error Image + Drawing Image

• compute new contours from error image. NOT DONE.
• accumulate error image. NOT DONE.
• accumulate drawing image. NOT DONE.