1. A visual sensor, comprising: a set of first circuits configured in parallel to generate a plurality of analog signals based on information observed from a visual field; a set of second circuits configured in parallel to generate a plurality of analog feature signals based on the plurality of analog signals; a third circuit capable of generating a plurality of binarized feature signals based on the plurality of analog feature signals and in accordance with a function selected from a plurality of possible functions based on a plurality of switch signals, wherein the third circuit comprises a plurality of binary generators configured in parallel to generate a plurality of binary values based on the plurality of analog feature signals and the selected function, each of the plurality of binary generators generates at least one of the plurality of binary values based on at least two of the plurality of analog feature signals, and the third circuit generates the plurality of binarized feature signals based on the plurality of binary values, wherein the plurality of analog signals relate to photo perception, the third circuit is reconfigurable.