The research on melt wettability experiment under microgravity is critical to carry out the wettability verification experiment of high temperature key materials in space station. A feedback control algorithm based on image eigenvalues is proposed. The algorithm

based on the similarity of the image Hu moment feature

can determine the melt profile change and detect the melt melting node. Meanwhile

it can adjust the camera acquisition frame rate. The algorithm can accurately identify the melt melting state; compared with the traditional static frame rate method

the maximum memory consumption obtained by the image feedback control algorithm is only 83. 9 %

which effectively realizing the savings and optimization of storage space.