The Image Reading Technology And Application Research

Pointer instrument is to realize the automatic reading recognition instrument automatic verification, the intelligent one of the important foundation and key. In industrial field application, the following aspects of problems, such as the background and instrumentation framework similar circumstances,how to divide the dial;Pointer and dial background color similar situation, how to put the pointer partition; Field instrument dial tilt, such problems as how to improve the character recognition rate correction instrument tilt.After reading some Chinese and foreign related papers,according to the above several problem,this paper puts forward the improved or new solutions.Mainly do the following several aspects:1.Locate the field instrument dial center of rotationOn the dashboard similar background color contour image and its installation, instrument center is difficult to determine. This paper proposes a method, the method through a maximum threshold, large scale line segment the instrument,combined with morphological knowledge,least squares method for rotating center coordinates. Instrument dial instrument determination of center of rotation,and created the possibility are inseparable and other follow-up work.2.Extraction of low chromatic aberration pointer instrument pointer contourFor instrument pointer and instrument dial color difference is small, pointer to the problem of difficult to extract contour, this paper adopts an improved level set algorithm is proposed, the algorithm can automatic contour segmentation pointer. Has good anti-interference, can make a thin target segmentation effect is good.3.Automatic correction tilt meterCircular pointer instrument tilt on site, this paper proposes a new method of Angle detection, the method is by measuring instruments Angle as the name on the dial gauge Angle. Detection operator is combined with the Canny operator, morphology and the improved Hough transform operator, least squares straight line fitting to get the name of Angle. The algorithm can effectively tilt correction instrument.This system has carried on the Matlab simulation, the results showed the effects of improved meter automatic reading data, has certain theoretical significance and practical value.