Voice Graphical Matrix Encoded To Quickly Locate And Nonlinear Distortion Correction Technique

2D (Two Dimensional) barcode has increasingly broad prospects in the publishing, transportation, commerce, manufacturing, health care, warehousing and other fields. Domestic and foreign scholars have studied this subject in depth.However, the research of how to use 2D barcode to store speech information is still in its infancy. This field with huge marketplace includes several subjects such as digital speech encoding, 2D barcode technology, embedded system design and microelectronics technology. This paper presents our relevant work on this field, with a focus on the rapid location and non-linear distortion correction technology.We give a brief survey on 2D barcode technology at first and specify the graphical barcode for speech information, including its coding rules, data capacity, decoding flow, implementation system, the next step for research and so on.Then we present a rapid location and non-linear distortion correction method for our graphical barcode. It uses four circular symbols to locate a barcode unit. Since there is a great difference between the diameters of data points and locating symbols, some edge points of the latter ones can be found and used to determine a rough center of them. To be precisely located, the rough center would be rectified in two vertical directions. Then, based on the model of Perspective Projection Distortion and Scan Distortion, we could obtain the location of information bits and recognize the barcode correctly.Subsequently, we analyze the performance of this method based on the experimental result and conclude that this method with strong anti-fouling and anti-distortion capacity is fast and space-saving.Finally, we give a brief summarization and forward some future work.