PURPOSE: An image sensor performing a binning operation in a domain is provided to acquire the image of high resolution in a pixel area by excluding spatial resolution of low illuminance. CONSTITUTION: A pixel array(210) includes a plurality of unit pixels. A column readout circuit(230) is composed at the column of a plurality of unit pixels. The column readout circuit includes column reading units. The column read station gets an image frame from the array of the pixel. The column readout circuit generates the low-illumination area information. If the next video frame is inputted, the low water in which the column readout circuit pitches is proceed the binning operation.
