Neural network training and matting method and device, and storage medium

The invention provides a neural network training and matting method and device and a storage medium, and the method comprises the steps: determining a region of interest on a sample image; wherein the concerned area is an image area where an object concerned by the user is located; inputting the sample image marked with the region of interest into an initial neural network, and determining a prediction mask graph corresponding to the region of interest by the initial neural network; wherein the prediction mask graph is used for identifying foreground pixel points and/or background pixel points in the region of interest; based on the sample image marked with the region of interest and the prediction mask image, determining a prediction matting mask which is output by the initial neural network and corresponds to the region of interest; and training the initial neural network based on the difference between the predicted cutout mask and a real mask corresponding to the region of interest, and obtaining a target