[Feature] Add IC13 preparer

[xinke-wang]

After #1529

[codecov]

Codecov Report

Base: 85.81% // Head: 85.82% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (c90424c) compared to base (31c41d8).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #1531      +/-   ##
===========================================
+ Coverage    85.81%   85.82%   +0.01%     
===========================================
  Files          158      159       +1     
  Lines         9881     9927      +46     
  Branches      1368     1377       +9     
===========================================
+ Hits          8479     8520      +41     
+ Misses        1159     1158       -1     
- Partials       243      249       +6     

Flag	Coverage Δ
unittests	85.82% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../models/textdet/postprocessors/db_postprocessor.py	86.30% <0.00%> (-6.85%)	⬇️
...ocr/datasets/preparers/parsers/icdar_txt_parser.py	82.35% <0.00%> (-5.46%)	⬇️
mmocr/datasets/preparers/parsers/base.py	72.00% <0.00%> (ø)
mmocr/datasets/preparers/data_obtainer.py	20.73% <0.00%> (ø)
mmocr/datasets/preparers/parsers/svt_parser.py	100.00% <0.00%> (ø)
mmocr/utils/bbox_utils.py	61.84% <0.00%> (+1.60%)	⬆️
...r/models/kie/postprocessors/sdmgr_postprocessor.py	91.17% <0.00%> (+5.88%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.

[gaotongxiao]

https://download.openmmlab.com/mmocr/data/1.x/recog/icdar_2013/train_labels.json

[xinke-wang]

Since the image path is unified to textrecog_imgs/${split}. It might be better if we provide this pre-generated JSON file with the same path. So the IC13 data preparer only needs to download data without conversion.

train/***.png -> textrecog_imgs/train/***.png

[gaotongxiao]

fixed

[gaotongxiao]

https://download.openmmlab.com/mmocr/data/1.x/recog/icdar_2013/test_labels.json

[xinke-wang]

Challenge2_Test_Task3_Images/***.png -> textrecog_imgs/test/***.png

[gaotongxiao]

fixed

[Harold-lkk]

does docs/zh_cn/user_guides/data_prepare/dataset_preparer.md update？