Existing distance measurement methods either require multiple images and special photographing poses or only measure the height with a special view configuration. We propose a novel image-based method that can measure various types of distance from single image captured by a smart mobile device. The embedded accelerometer is used to determine the view orientation of the device. Consequently, pixels can be back-projected to the ground, thanks to the efficient calibration method using two known distances. Then the distance in pixel is transformed to a real distance in centimeter with a linear model parameterized by the magnification ratio. Various types of distance specified in the image can be computed accordingly. Experimental results demonstrate the effectiveness of the proposed method.
Aiming to solve the problem of difficulty of wiring and operation of infant incubator test, we put forward a wireless smart sensor module based on IEEE 1451. The module can realize the function of self recognition, plug and play. The key technology of wireless smart sensor module is thoroughly discussed, and the circuit module is developed. The test indicates that the module can be used in the detection of infant incubator.
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