Learning OpenCV 4 Computer Vision with Python 3 - Third Edition

Understanding BoW

BoW is a concept that was not initially intended for computer vision; rather, we use an evolved version of this concept in the context of computer vision. Let's first talk about its basic version, which – as you may have guessed – originally belongs to the field of language analysis and information retrieval.

Sometimes, in the context of computer vision, BoW is called bag of visual words (BoVW). However, we will simply use the term BoW, since this is the term used by OpenCV.

BoW is the technique by which we assign a weight or count to each word in a series of documents; we then represent these documents with vectors of these counts. Let's look at an example, as follows:

• Document 1: I like OpenCV and I like Python.
• Document ...