The present disclosure pertains to an image capturing device and an information processing system, which enable reduction in data volume of images and the like transmitted through a network and whichenable suppression of power consumption of the image capturing device. An information processing device which is a first aspect of the present disclosure is provided with: an image sensor having an image capturing surface in which a large number pixels are arranged in a matrix like manner; a pixel control unit that controls the image sensor to select, by applying a sampling function on each blockobtained by creating multiple partitions on the image capturing surface of the image sensor, a pixel corresponding to the sampling function among the pixels forming the block and to output a samplingsignal based on a pixel value of the selected pixel; and a scaled-down image generation unit that generates a scaled-down image on the basis of the sampling signal for each of the blocks outputted from the image sensor.