SSI chips are usually basic logic gates and flip-flops.
As a dramatic revolutionary moment, the storming of Egypt's notorious State Security Investigations Directorate (SSI) seemed to rank with the fall of the Stasi headquarters in East Berlin in 1990.
Side-scan sonar image (SSI) must be segmented into regions of shadow, sea-bottom-reverberation, and object-highlight before underwater object can automatically be detected and recognized.