Disclosed are a video processing device, a video processing method, a monitor apparatus, a computer device, and a computer-readable medium. The video processing device includes: a receiver, a normalization processor, a selector and an image processor. The receiver is configured to receive an original video image. The normalization processor includes a plurality of normalization sub-circuits each configured to perform format adjustment on the original video image to generate a video image in a target format. Different normalization sub-circuits perform the format adjustment in different manners. The selector is configured to output the video image generated by at least one of the normalization sub-circuits to the image processor according to a received selection instruction; and the image processor is configured to generate an image to be displayed from the received video image.