Temperature-sensitive paint wind tunnel experiment image filtering method

The invention provides a temperature-sensitive paint wind tunnel experiment image filtering method, which comprises the following steps: (1) acquiring a temperature-sensitive paint wind tunnel experiment image f (x, y); (2) carrying out filtering algorithm operation on the image f (x, y) to obtain an image f '(x, y); (3) carrying out pixel gradient calculation, non-maximum suppression, lag threshold processing and isolated weak edge suppression operation on the experimental image f (x, y) to determine an outer contour of an experimental model, and then carrying out morphological dilation operation to obtain an adjacent region where the outer contour of the model is located; according to the result, pixel information of a corresponding position is extracted from the experiment image f (x, y) to form a sub-image g (x, y); (4) filtering the sub-image g (x, y) of the near region of the outer contour of the model by selecting an optimal filtering algorithm and the size of a filtering kernel to obtain an image g '(