Two-dimensional Bar Code-qr Code Research And Application

QR Code is a kind of 2D matrix barcode .It has high density ,great capacity that will influent coding of 2D-barcode. A RS code is cyclic symbol error-correcting code,which can correct lost or missing data for damaged symbols.Compression of photo is a relatively difficult technology in 2D code.it can't leave big space for photo which influent its ability of storage .Because the resume of compressed photo it requests relative low compressive ratio.ROI(Region of Interest)梑ased embedded coding in the article is a technology which probably settle upper problem. It mainly has the following characteristics:1. Allocate different bitrate to different region. High bitrate to the region to which the human visual system is sensitive while low bitrate to the other regions.The reconstructed image with a high compressive rate can still hold fairly good subject quality.2. Produce embedded bitstreamThe length of each of the three parts stored in the barcode is not fixed,embedded bitstream can make full use of the limited space of the storage media .Quick response is main characteristic of QR code that distinguish from other 2-D barcode. Utilizing trait of high density, great capacity of 2-D barcode may store information of vehicle,information of car master , information of bank in QR Code .Combining above point can realize automatic charge of ITS use QR Code and ETC.