Abstract: An image sensor and a pixel reading method used this image sensor, in which the accuracy of a black level can be increased by that an optical black region being the black level reference of signals is read every horizontal line at a local or random access mode, are provided. And also the structure of a camera system used this image sensor can be simplified is provided. The image sensor is a MOS type image sensor composed of a pixel array region and an optical black region disposed at the one end in the pixel array region. And the MOS type image sensor provides a mode selector that selects the local access or random access mode or a frame access mode. When the local access or random access mode is activated, the image sensor decides a pixel reading region in the pixel array region. The image sensor reads information of one or more pixels having a designated horizontal line address in the pixel reading region every horizontal line address.

Abstract: An image sensor and a pixel reading method used this image sensor, in which the accuracy of a black level can be increased by that an optical black region being the black level reference of signals is read every horizontal line at a local or random access mode, are provided. And also the structure of a camera system used this image sensor can be simplified is provided. The image sensor is a MOS type image sensor composed of a pixel array region and an optical black region disposed at the one end in the pixel array region. And the MOS type image sensor provides a mode selector that selects the local access or random access mode or a frame access mode. When the local access or random access mode is activated, the image sensor decides a pixel reading region in the pixel array region. The image sensor reads information of one or more pixels having a designated horizontal line address in the pixel reading region every horizontal line address.