Mastering OpenCV 4 with Python

Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "The code for build_sample_image() is provided next."

A block of code is set as follows:

 channels = cv2.split(img)    eq_channels = []    for ch in channels:        eq_channels.append(cv2.equalizeHist(ch))

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

Hu moments (original): '[ 1.92801772e-01 1.01173781e-02 5.70258405e-05 1.96536742e-06 2.46949980e-12 -1.88337981e-07 2.06595472e-11]' Hu moments (rotation): '[ 1.92801772e-01 ...