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: "On the other hand, to rotate an image, you can use the rotate function."

A block of code is set as follows:

HistCompMethods method = HISTCMP_CORREL; 
double result = compareHist(histogram1, histogram2, method); 

Any command-line input or output is written as follows:

pip install opencv-python

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Before we start with the shape-analysis and feature-analysis algorithms, we are going to learn about an easy-to-use, extremely powerful method of object detection called template matching."