The Research On The Key Technology For The Shell Of Pointer Multi-meter

The automatic processing and recognition of the shell image of pointer multi-meter is one of an important component for the automatic calibration devices which is based on machine vision. In this thesis, the technology of machine vision and image processing has been applied to process the automatic processing and recognition of the shell image of pointer multi-meter, which is stressed on image segmentation, tilt correction and character segmentation and recognition.In the aspect of segmentation, tilt correction and character recognition, the technology has become mature and it has acquired great achievements all around the world. However, the research of the shell image of the pointer multi-meter is inadequate and the analytic documents about it are also seldom. As a result, it is of great significant to research on the shell image processing.This thesis mainly did something and got some achievements as follows:1. Research the pre-processing and segmentation of the shell image of the pointer multi-meter.Research the pre-processing of the shell image of the multi-meter, segment and extract the pointer of the switch to multi-meter measuring range and the compass display of the black disk. Design algorithms to realize accurate image inpainting for the compass display. Segment and extract the graduated values round the black disk, then recognize the location of the pointer which relevant to the graduated value. At last, extract the text region. Research the character segmentation and character conglutination for the shell image of the point multi-meter.2. Research the text recognition and classification recognition of the shell image of the pointer multi-meter.Realize the text recognition through template matching. Introduce the methods of how to make the template and how to calculate the template matching. According to the feature of the shell image of the pointer multi-meter, research the character category recognition: the method of regional color recognition and the method of the range of curve contain the compass display. Then design and realize the algorithm of the text recognition and character category recognition.3. Design and realize the image processing system of the shell image of pointer multi-meter.Through using the software of Matlab7.0, good results have acquired from the experiment of the automatic processing and recognition of the shell image of pointer multi-meter. The algorithms and methods have been realized and applied to the automatic calibration system.