A hybrid optical/digital image processing system applicable to stellar speckle interferometry in order to attain diffraction limited resolution of sky telescope is described. It consists of a coherent optical processor, a miorodensitometer and a microcomputer. Following a brief analysis of the requirements for the data processing in stellar speckle interferometry, the system configuration and design are presented. Simulation experiments demonstrate the satisfactory performance of the system. Some further developments and potential applications are also discussed.