PY-Net: Rethinking segmentation frameworks with dense pyramidal operations for optic disc and cup segmentation from retinal fundus images. - Rajarshi Bhattacharya; Rukhshanda Hussain; Agniv Chatterjee; Dwipayan Paul; Saptarshi Chatterjee; Debangshu Dey (Biomed. Signal Process. Control., 2023)