Fuzzy Inference Integrating 3D Measuring System with Adaptive Sensing Strategy

This chapter deals with a 3-D measurement system applied to a curved metal surface carving system, and a sensor integration method based on fuzzy inference and adaptive sensing strategy. The measurement system consists of two different sensors. One is a LED displacement sensor, while the other is a vision system. The LED displacement sensor’s spot-light is used as a part of the vision system based on the active stereo sensing method. In addition, the LED displacement sensor’s outputs are used for calibrating camera parameters. Therefore, we can calibrate the camera parameters easily. Then, we use neural networks to compensate the output of the image processing for some errors, such as camera parameter’s error and lens distortion. By utilizing the neural networks, we can use a vision system accurately. We use a sensor integration method based on the fuzzy set theory. Fuzzy inference’s input consists of information on the change in the sensor output and the position change of the sensor system, together with the environmental data of measurement. Vision system can be used under various environmental condition, but it takes long time. The LED displacement sensor can obtain the information quickly, but it can only be used in limited environmental condition. In order to measure the object quickly and accurately, the sensor integration system has an adaptive sensing strategy. The sensing strategy depends on a relation between the state of the object, e.g. color, temperature, etc., and the sensor specification. The proposed system is shown to be effective through extensive experiments.

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