decoding vs delineation

decoding

noun
  • An instance of the translation of something into a form more suitable for subsequent processing. 

delineation

noun
  • The act of delineating; depiction. 

  • An image of the outline of an object. 

  • A graphic verbal description. 

How often have the words decoding and delineation occurred in a corpus of books? (source: Google Ngram Viewer )