Abstract: An integrated sensor and analog processor for visual images is produced from an array of photoreceptor signals that are the space-time derivative of the photoreceptor outputs. Each photoreceptor output V.sub.R is first processed by an integrator having a predetermined time constant using a differential transconductance amplifier driving an integrating capacitor, and feeding the output signals V.sub.H back to the negative input, thereby generating a time integrated signal for each pixel of the array. The output terminal of the integrating amplifier is connected to a node that is coupled to the outputs of similar integrators of neighboring pixels by resistive connections thereby forming a spatially smoothed version of the image. At each node a differential amplifier takes the difference between the node potential and local receptor potential, whereby an output representing a first temporal derivative and second spatial derivative is computed.