1. A computing device, the computing device connected to an image capturing device, the computing device comprising: a storage system; at least one processor; and one or more programs stored in the storage system and executable by the at least one processor, the one or more programs comprising: an image obtaining module operable to capture a digital image of an object using the image capturing device, and obtain a standard image of the object from the storage system; an image calculation module is operable to calculate an image average energy density (IAED) value of the digital image based on RGB (red, green, blue) channels of the digital image, and an IAED value of the standard image based on RGB channels of the standard image, and calculate a difference value between the IAED value of the digital image and the IAED value of the standard image; an image conversion module operable to optimize each pixel point of the digital image to generate an optimized pixel point according to the IAED difference value of the digital image and the standard image; and an image generating module operable to integrate all the optimized pixel points to generate an optimized image, and display the optimized image on a display device of the computing device.