An image processor, which determines appropriate exposure parameters for a shutter assembly in a camera. The image processor may computationally determine a region of interest in a scene sought to be captured, and set the parameters to ensure that the exposure parameters are set to capture an image of the scene with the region of interest having a desired brightness level. In an embodiment, pixel values of multiple frames (each frame with a corresponding set of configuration parameters of the shutter assembly) may be examined to determine the frame having pixel values with the region having the desired brightness level. The shutter assembly may be configured with the parameters corresponding to such a frame to provide an auto-exposure feature.