Automatic reading of meter based on image sensor is the trend of modern measurements.An automatic reading measurement system combining machine vision and image processing technology is designed.It makes full use of diffuse reflection LED optical source

to effectively reduce the specula reflection of highly reflective surface

to obtain high quality image.Use shifting register linear approach method to recognize the trained scale from scale group.Featured window translation method is used to realize fast character recognization.The experiment shows that the accuracy of measurement system is doubled than the traditional measurement methods with convenient operation and high efficiency.