Abstract
A vision sensor with adaptive response was implemented. To maximize the amount of information expressed in each image, the sensor exploited logarithmic response to high intensity, and entropy based adaptation. The logarithmic response, which enhances the dynamic range of the sensor, was achieved by applying a logarithmically varying voltage to the reset terminals of the active pixel sensors. By adjusting the logarithmic voltage property, the sensor adapts to the environmental illumination so that the output image data distributes across the available voltage range. The appropriate logarithmic property was determined based on entropy maximization. The quality of the output image was maintained irrespective of illumination changes.
