Infrared weak and small target background inhibiting method and device on basis of global filtering

The invention provides an infrared weak and small target background inhibiting method on the basis of global filtering. The infrared weak and small target background inhibiting method comprises the following steps: repeatedly carrying out smoothing processing on an infrared image; cascading a plurality of images in different smooth scales, which are obtained after smoothing processing, to generate an infrared image data cube; according to a local normalized Euclidian distance, separating weak and small targets and a background image in the generated infrared image data cube; according to a nonlinear function, reinforcing the weak and small targets separated according to the local normalized Euclidian distance, inhibiting the background image separated according to the local normalized Euclidian distance and obtaining an image of which the background is inhibited. The invention also provides an infrared weak and small target background inhibiting device on the basis of the global filtering. By the infrared wea