Disclosed herein is a Complementary Metal-Oxide-Silicon (CMOS) image sensor The image sensor includes a two-dimensional pixel array composed of unit pixels, each unit pixel having a photo diode and transistors, a row decoder located at an end of the pixel array to assign row addresses, and a column decoder located at another end of the pixel array, which is erpendicular to the row decoder, to assign column addresses to corresponding pixels in rows selected by the row decoder The row decoder allows the integration time points of the unit pixels, which are included in the pixel array, to be identical. Accordingly, the distortion of images can be prevented.