Automatic brain extraction from MRI of human head scans using Helmholtz free energy principle and morphological operations. - K. Ezhilarasan; S. Praveenkumar; Somasundaram Karuppanagounder; T. Kalaiselvi; S. Magesh; S. Kiruthika; A. Jeevarekha (Biomed. Signal Process. Control., 2021)