1. An image processor within an electronic device having a display panel, comprising: a receiving circuit, for receiving image/video data and corresponding metadata; an information analyzer, for analyzing the metadata of the image/video data to generate at least one analyzing result, wherein the metadata comprises information for setting an image sensor while generating raw image data for the image/video data; and an adjusting circuit, coupled to the information analyzer, for determining an image/video quality enhancement strength/degree by referring to the analyzing result, and adjusting an image/video quality according to the determined image/video quality enhancement strength/degree to generate adjusted image/video data to the display panel.