Added description to prepareExtractionCoordinates_ function, need review#2

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shubham1637 wants to merge 2 commits intodevelopfrom ShubhamBranch

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Commits on Mar 30, 2018

Added description to prepareExtractionCoordinates_ function, need review
shubham1637
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Commits on Apr 3, 2018

Added comments before prepareExtractionCoordinates_ and some other functions
shubham1637
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