The image picking up chip includes image sensor composed of multiple sensing units, computation logic circuit, and logic circuit for updating exposure parameter. If exposure expresses quantity of the first exposure zone, then value of the exposure parameter is unchanged in order to pick up next image by the image sensor; if exposure expresses quantity of the second exposure zone, then the value of the exposure parameter is adjusted based on the exposure parameter and the extreme value of the first exposure parameter in order to pick up next image by the image sensor; if exposure expresses quantity of the third exposure zone, then, the value of the exposure parameter is adjusted based on the exposure parameter and the extreme value of the second exposure parameter in order to pick up next image by the image sensor.