This paper presents a pointer positioning method based on Hough transform, which turns an arc scale to a transverse rectangular scales, scans the region from bottom to top line by line, determines smaller rectangular area containing pointer only, uses Hough transform in linear theory to detect the pointer position in the region. Experiments show that this method can locate the pointer position quickly and efficiently in analog measuring instruments.

Based on the characteristics of high power diesel engines’ thermal balance analysis, a diesel engines’ thermal balance test and analysis system is developed through dealing a large number of test data. This system can real time monitor the temperature, pressure and flow rate of the components in cooling circuit, fuel circuit and gas circuit, can continuously record and store the state parameters, can realize theory computation, statistical analysis, query, and print data report. Also the system can realize remote operation. This system has already been operated in several enterprises. Results show that the system can estimate diesel engines’ thermal balance effectively. According to the analysis results, diesel engines’ designers can estimate the components that bearing excessively high thermal load and can solve the thermal balance problem of high power engines.

Focused on static high-definition sequence images captured on the highway bayonet, this paper proposes a new approach for vehicle detection and shadow elimination based on average background modeling, which uses average background model and background subtraction to locate vehicle roughly, eliminates shadow of the vehicle using canny edge detection with dynamic histogram threshold determined by the histogram of the image. Experiments show that this method can locate the position of vehicle quickly and accurately.

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