Analog integrated circuit for edge and motion detection of a moving target based on biological systems

An analog circuit for edge detection was proposed based on vertebrate outer retinas. The measured results of a fabricated chip and the results with the simulation program with integrated circuit emphasis (SPICE) showed that edge positions can be detected with a dynamic range of 6 decades of light intensity. A chip for detection of an approaching object was also fabricated, which inputs edge signals. The measured results showed that the chip can detect approaching velocities and directions. It was clarified from the results with SPICE that the approaching object can be detected with the wide dynamic range by applying the proposed edge detection circuit to the first stage of the approach detection network.