Research On Image Recognition System In Digital Instrument Based On BF531

With the quickly development of people living standard,Gas meter, water meter or other digitalinstruments in the measurement of industry have been used more and more widely. Whether thiskind of digital instrument is capable of accurately reflects usage of the gas and water, it’s related totheir benefit both the consumer and the supplier.As an example of the gas meter,gas metercalibration device is a kind of device that can examine the gas meter’s error, and it can accuratelyexamine the meter whether is the certified product.In this kind of digital instrument’s errorexamines,it need to make the sampling to the digital instrument turned laps, thus calculating thedigital instrument error.The traditional approach to measure the laps is to use a electro-opticalsampling instrument.But the electro-optical sampling instrument is not universal,it can’t examinesome digital instrument’s results.In the view of the digital instrument image’s characteristic in this paper, it is proposed a novelimage processing system based on BF531 processor to realize the recognition of suchinstrument.The system is used to the digital image processing technology to realize therecognition,and gains the measuring results of instrument to realize to digital instrument’s intelligentcontrol.At first, the system realizes the image recognition algorithm on PC machine, and then thealgorithm will be transplant to the BF531 processor.Whether a digital instrument is qualified,we canset a fixed value through the gas volume when the instrument turned a circle, and record the actualvolume when the instrument turned a circle, thus we can calculate the error.The main work of this paper are as follows:(1) According to the design requirements of the system, the system uses BF531 chip from theADI company as the core processor.BF531 of the system can reduce the production cost, and havereached the optimal effect on the algorithms of processing performance.(2) The paper introduces the system’s hardware platform, and has given the electric circuitschematic diagram and the PCB domain.(3) The system does a large number of experiments, analyzes and compares on imagerecognition algorithm, includes the motion detection background, background modelingalgorithm ,minutiae and feature point matching algorithm on digital instrument image.And we findthese algorithm are not suitable for this system on the performance and complexity aboutalgorithms.At last, the system uses based on L2-norm distance minimization algorithm in imagerecognition.With the completion of image recognition of the digital instrument,the image processingperformance of the system meets the design requirements, and the complexity of the algorithm is very small.(4) In VDSP++5.0 development environment, it has completed the system’s software design,aswell as the algorithm transplant and the optimization.The time consumption of algorithm hasachieved the real-time processing digital instrument image.Through the system debugging and testing on data, the image recognition system in digitalinstrument based on BF531 can make the sampling to the digital instrument real-time and accurately,and provide reliable parameter support for the digital instrument error calibration device.