1. A processing method of quick response code (QR code), comprising: an edge processing procedure, for converting an original image to derive a binarized input image; a QR code positioning procedure, for deriving position information of a QR code from the input image, wherein the QR code positioning procedure comprises: a group searching procedure, for deriving a plurality of finder pattern groups complying with a finder pattern of the QR code, wherein the group searching procedure comprises: deriving a plurality of luminance groups according to a luminance of each pixel within the input image; utilizing a determining circuit to identify the finder pattern groups complying with the finder pattern of the QR code according to each center point of each luminance group among the luminance groups; and deriving position information of each finder pattern group of the finder pattern groups; and a tag searching procedure, for deriving the position information of the QR code according to the position information of the finder pattern groups; and a projection modification procedure, for converting the original image into a modified image according to the position information of the QR code.