1. A system for automated exposure adjustment using contrast entropy, the system comprising: one or more processors and a non-transitory computer-readable medium having executable instructions encoded thereon such that when executed, the one or more processors perform operations of: capturing a plurality of images using an image sensor, each of the images being captured at a distinct exposure value; for each image, determining a gradient magnitude; determining a probability distribution of each gradient magnitude; using the probability distribution, determining an entropy based on contrast for each of the plurality of images; and outputting a selected image from the plurality of images, the selected image having the largest entropy based on contrast among the plurality of images.