Add converter from Pascal VOC to Weed COCO

[jnothman]

Fixes #33

Replaces #49

[jnothman]

I'm currently getting a red mark here because license is required in each Image. I'd like to disable this requirement, and discuss how we want to represent image license, if we want to beyond collection membership, in a separate issue.

[jnothman]

See #105, @hlydecker

[hlydecker]

I like the direction you are taking with the utils; it will be good to refactor as many functions as possible out of individual converters into this.

So far this looks good to me, @ElevnLi and I will expand on this with the RDS data.

[jnothman]

Thanks for the review, just need to sync this with the current schema to make the ticks green...

[jnothman]

This passes pytest locally... should be good to merge.

[codecov]

Codecov Report

Merging #101 into master will increase coverage by 19.66%.
The diff coverage is 98.51%.

@@             Coverage Diff             @@
##           master     #101       +/-   ##
===========================================
+ Coverage   31.48%   51.15%   +19.66%     
===========================================
  Files           6        8        +2     
  Lines         343      477      +134     
===========================================
+ Hits          108      244      +136     
+ Misses        235      233        -2     

Flag	Coverage Δ
#weedcoco	51.15% <98.51%> (+19.66%)	⬆️

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Impacted Files	Coverage Δ
weedcoco/tests/importers/test_voc.py	97.77% <97.77%> (ø)
weedcoco/importers/voc.py	98.50% <98.50%> (ø)
weedcoco/utils.py	81.25% <100.00%> (+81.25%)	⬆️

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[jnothman]

After updating weedcoco/schema/AgContext.yaml to support EPSG:3857, I could modify Guy's agcontext file and use this to load images into ES:

dir=/Volumes/research-data/PRJ-iweeds/data/raw/SOLES/narrabri/2019-winter/20190728
python -m weedcoco.importers.voc --voc-dir $dir/voc --image-dir $dir/img  --category-name-map $dir/category-name-map.yaml   --collection $dir/collection.yaml --agcontext $dir/agcontext.yaml -o /tmp/coco_from_voc-test.json --validate
cat /tmp/coco_from_voc-test.json | python weedcoco/draft\ export\ to\ elastic.py --thumbnail-dir artificial | curl -vv -X POST localhost:9200/_bulk  -H 'Content-Type: application/json' --data-binary @-