Terminal, system and method for achieving long-range two-dimensional code scanning

The invention discloses a terminal, system and method for achieving long-range two-dimensional code scanning. The size of a large-range scanned two-dimensional code image satisfies a requirement through zoom-up of a focal length, and the recognition rte of the large-range scanned two-dimensional code image is improved through definition recovery processing, so an application in an application scene that a user cannot perform close-range scanning or the close-range scanning is inconvenient to perform by the user is achieved, and user's business usage experience is improved. Furthermore, analysis is further performed aiming at a characteristic of the two-dimensional code image, and an optimization implementation scheme of the definition recovery processing is brought forward, that is to say, through a combination of interpolation processing firstly and a threshold judgment, definition recovery of the image can be rapidly and effectively completed; and, for the processing mode, the image processing process is re