283 What is mask RCNN

CNN – Convolutional Neural Network​
RCNN – Regionbased Convolutional Neural Network​
Faster RCNN – Faster Regionbased Convolutional Neural Network​
Mask RCNN – Mask (faster) Regionbased Convolutional Neural Network​

Mask RCNN is built using Faster RCNN​
In addition to class label and bounding box, Mask RCNN outputs an object mask. ​
Uses a trick called ROIAlign to locate relevant areas down to pixel level. ​