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Learn OpenCV 4 by Building Projects - Second Edition by Prateek Joshi, Vinicius G. Mendonca, David Millan Escriva

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Identifying paragraph blocks

The next step is to perform connect component analysis to find blocks that correspond with paragraphs. OpenCV has a function for this, which we previously used in Chapter 5, Automated Optical Inspection, Object Segmentation, and Detection. This is the findContours function:

vector;vector;Point;contours; 
findContours(dilated, contours, RETR_EXTERNAL, CHAIN_APPROX_SIMPLE);  

In the first parameter, we pass our dilated image. The second parameter is the vector of detected contours. Then, we use the option to retrieve only external contours and to use simple approximation. The image contours are presented as follows. Each tone of gray represents a different contour:

The last step is to identify the minimum rotated ...

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