LBM computational domain planning method based on image recognition

The invention discloses an LBM computational domain planning method based on image recognition, which surpasses the limitation that a mathematical expression required by a traditional specified computational domain expresses a computational domain and boundary conditions, and can divide the computational domain into an integer matrix containing predefined label information based on any closed image (engineering image or actual experimental image). According to the method, after a closed image is input, a plurality of regions are automatically divided through a series of preprocessing, pixel points in the regions can be selected, a drainage basin and a wall surface region are planned according to a predefined integer label, pixel points near the edge of the image are selected to automatically identify a boundary entrance and exit, and planning is also carried out according to a predefined integer. Finally, a matrix with various predefined integer information is output, and different regions and entrances and e