1. An image processing system, comprising: circuitry configured to determine whether a manual focus operation is performed by a user on an image, display, on a display, the image in a first resolution when the manual focus operation is determined not to be performed, process the image in a second resolution, which is greater than the first resolution, to obtain edge information in the image when the manual focus operation is determined to be performed; and display, on the display, the image together with the edge information highlighted when the manual focus operation is determined to be performed, wherein when the circuitry switches from processing the image in the second resolution to processing the image in the first resolution mode, the circuitry adjusts at least one of a flicker width, a size and an effective range of the image.