Neighborhood determination method, image filtering method and device

The invention provides a neighborhood determination method, and an image filtering method and device. The neighborhood determination method comprises the following steps: determining a target domain and a plurality of neighborhoods to be selected in an image to be filtered; the target domain comprises a plurality of first pixel points, the neighborhood to be selected comprises a plurality of second pixel points, and the number of the first pixel points is the same as that of the second pixel points; constructing a high-dimensional space, and determining a target domain vector of the target domain in the high-dimensional space and a neighborhood vector of each neighborhood to be selected in the high-dimensional space; the dimension of the high-dimensional space is the same as the number of the first pixel points; and determining a space included angle between each neighborhood vector and the target domain vector, and determining at least one target neighborhood in the plurality of neighborhoods to be selected