For the trans-scale three-dimensional (3D) measurement in regular-size space and industrial applications, there are many deficiencies and application limitations for traditional measurement methods. Reference to the three axes architecture of traditional instruments, a novel non-orthogonal shafting laser sensor is proposed. The novel sensor is mainly composed of two non-orthogonal shafting laser sensing modules, and each module is made up of two one-dimensional rotary tables and one collimated laser. In the novel laser sensing module, the three axes represent a non-orthogonal shafting architecture, with no orthogonal and intersecting requirements. The manufacturing and application costs are greatly reduced. A high-accuracy calibration method based on coordinate measuring machine and image processing is introduced. An improved perspective projection transform model and attitude kinetic model described by quaternion are adopted to calculate the 3D coordinates of spatial points. The simulation and experimental results showed that a maximum error less than 0.1 mm was detected from 100 mm to 500 mm. It is proved that trans-scale 3D measurement is feasible with the proposed non-orthogonal shafting laser sensor.
In this paper, the image processing and parameters measurement method of rising bubbles has been studied. The original
bubble image captured is pre-processed with image gray processing, difference image and median filter. According to
the characteristic of bubble images, the improved Otsu method with dynamic threshold compression is used for image
binarization, and the scan line seed fill algorithm is combined with morphological image processing to implement holes
filling. Simultaneously, automatic identification technique of bubble feature regions is proposed based on the edge area
attribute. After the aforementioned image processing algorithms and processes, the shape feature parameters of bubbles
such as perimeter, area, circularity, and mass center coordinate can be extracted effectively as well as the measurement
of bubble velocity.The experimental results show that the method is easy, robust and effective, and the parameters of
bubbles can be measured precisely.
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