Decoupling path dependence in notebooks

[zhiqwang]

This is a follow-up PR of #82 .

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Codecov Report

Merging #84 (290b933) into master (3087993) will increase coverage by 0.20%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #84      +/-   ##
==========================================
+ Coverage   81.76%   81.97%   +0.20%     
==========================================
  Files           8        8              
  Lines         735      738       +3     
==========================================
+ Hits          601      605       +4     
+ Misses        134      133       -1     

Flag	Coverage Δ
unittests	81.97% <100.00%> (+0.20%)	⬆️

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Impacted Files	Coverage Δ
test/test_image_utils.py	100.00% <100.00%> (+3.12%)	⬆️

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