IMAGE SENSOR AND IMAGE PROCESSING DEVICE INCLUDING THE SAME

An image sensor comprising a pixel array in which a plurality of pixels are arranged and a row driver . Each of the pixel includes a photodiode, a transfer transistor for transferring photocharges of the photodiode to a floating diffusion node (FD), a conversion gain control transistor, a first source follower for amplifying and outputting the voltage of the FD to a first node, a precharge selection transistor connected between the first node and a second node, a first capacitor, a first sampling transistor connected between the second node and the first capacitor, a second capacitor, a second sampling transistor connected between the second node and the second capacitor, a second source follower for amplifying a voltage of the second node, a first selection transistor connected between the second source follower and a column line, and a second selection transistor connected between the first node and the column line.