The invention discloses an ultrasonic
image denoising method based on
variational mode decomposition and
local space sparse fusion, which comprises the following steps of: firstly, adaptively optimizing key parameters of
variational mode decomposition by using a grey wolf optimization
algorithm to realize stable and efficient
decomposition of an ultrasonic image; then, classifying the
modal components according to the structural features of the
modal components, and implementing differentiated denoising strategies for different types of modals to separate
noise and reserve useful information; after
modal reconstruction, a sparse expression method based on
local space information is further introduced, according to the method, accurate
boundary detection is carried out through gradient
vector flow and gray scale proportion analysis, self-adaptive partitioning is carried out on an image according to boundary information, and finally sparse reconstruction is carried out through double dictionaries trained for different areas. According to the method,
speckle noise in the ultrasonic image can be effectively suppressed, and meanwhile, the capability of keeping the edge and detail information of a tissue structure is remarkably improved, so that the ultrasonic image with higher quality is obtained.