Testing

Testing

Testing reliability

• throw 1000 requests at the web interface and check the output

Testing performance

• pi max sustained wired network throughput ~4Mb/s:

dd if=/dev/zero over netcat
536870912 bytes (537 MB) copied, 135.758 s, 4.0 Mb/s
100mbit wired connection

• previews: downscale jpeg 4320x3240 -> 500x375:

• full image: 1.4Mb*2=2.8Mb wired network transfer at 4Mb/s~=0.7s

• downscaled preview: 50k wired network transfer neglegible= ~0.7s win

• pil, imagemagick: 5.2s

• epeg-cffi: 0.7s

• net effect to pc on wired LAN neutral (but faster rendering!)

• positive performance effect to tablet/phone/... or over wifi

• rotation:

• jpegtran does lossless jpeg rotation (fast, without decoding/reencoding)

• cropping:

• jpegtran (old python wrapper) does lossless jpeg cropping (fast along DCT boxes, without decoding/reencoding)

• deskewing:

• It probably makes sense to do this before feeding to tesseract since it would need to happen twice otherwise...

• unpaper

• leptonica

• imagemagick

• pamtilt (netpbm)

• scantailor-cli

• get public domain books

• scan and publish (github? ...)

• thumbnails for browser preview:

• epeg

• avoid temporary files (disk i/o!)

• bitonalisation (color -> b/w): unpaper,