1. An image capture chip, comprising: an image sensor with a plurality of sensor units, capturing an image to provide a plurality of exposure values when determining an exposure parameter; a calculating logic circuit, calculating an average exposure value of the exposure values; and a refreshing logic circuit, maintaining the exposure parameter if the average exposure value is within a first exposure range, and accordingly driving the image sensor to capture a next image; adjusting the exposure parameter according to a first exposure extreme if the average exposure value is within a second exposure range, and accordingly driving the image sensor to capture a next image; and adjusting the exposure parameter according to a second exposure extreme if the average exposure value is within a third exposure range, and accordingly driving the image sensor to capture a next image; wherein, the first exposure range is between the second exposure range and the third exposure range, and, the first exposure extreme and the second exposure extreme are referred to as a maximum parameter and a minimum parameter, respectively, within the variable range of the exposure parameter.