1. An image processing method comprising: obtaining at least one stencil mask region for a current frame; obtaining a first velocity field corresponding to a radial spreading from a central point of the at least one stencil mask region; obtaining a final velocity field for the at least one stencil mask region based on the first velocity field; determining a pixel value included in the at least one stencil mask region based on the obtained final velocity field; and displaying the current frame according to the determined pixel value.