Table 1.

The three generations of cIMT regional segmentation

SN	Attributes	First generation	Second generation	Third generation
1	Fields of engineering	Conventional image processing, signal processing/combined with image processing	Signal processing combined with image processing	Knowledge-based engineering
2	Computer vision methods or fusion of methods	Dynamic programming, Hough transform	Parametric (snakes) curves, geometric curves (level sets), scale-space, conventional classifiers	Machine learning and deep learning
3	Distance measurement methods or cIMT measurement methods	Vertical, shortest distance along with the columns of the image	Polyline distance method, centerline distance Method	Polyline Distance Method / Centerline Distance