An Image capturing device and a method of driving the image capturing device are provided. The image capturing device includes an image sensor configured to generate a target image based on a predetermined first exposure target value. An image signal processor generates a second exposure target value based on brightness information of the acquired target image to control the image sensor, wherein the image signal processor includes a histogram generation circuit configured to create a luma histogram based on the brightness information of the acquired target image, a calculation circuit configured to calculate a distribution of the luma histogram, and an exposure target control circuit configured to generate the second exposure target value based on the distribution of the luma histogram to provide the second exposure target value to the image sensor.