Location Method of Digital Meter Print Wheel Region Based on Fourier Transform
Weiqi Yuan · Yibiao jishu yu chuanganqi · 2010
Automatic reading system for mechanical digital meter has been widely used in industrial and control fields,and the method of print wheel location is the key technology to automatic reading for digital meter.Currently,main problems that affect print wheel location of mechanical digital meter are the complicated background of dial images,interfering information similar to print wheel and the tilting situation with arbitrary angles.Aiming at the above problems,a new algorithm of print wheel location based on Fourier transform was presented. The edge detection and mathematical morphology processing were used to filter effective region.It took advantage of fast Fourier transform to detect tilting angle of dial image and correct the tilting dial image.It accurately extracted the region of print wheel according to horizontal and vertical integral projection operator.The algorithm can locate the print wheel accurately with little computation.It shortens automatic reading system's running time effectively and has great significance to the realtime automatic reading system.