Depth Hypotheses Fusion through 3D Weighted Least Squares in Shape from Focus

Ali, Usman; Mahmood, Muhammad Tariq

doi:10.1017/s1431927621000106

Cited by 1 publication

(1 citation statement)

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“…A small sampling step size increases the number of images in the SFF, resulting in increased computation time and memory usage, whereas a large step size decreases the measurement accuracy [ 27 ]. Simulated geometries with manual noises are used to quantitatively assess the performance of the SFF and select the suitable combination of the focus measure operator, window size and sampling step size [ 28 , 29 , 30 ].However, it is difficult to mimic the complex and real measurement environment using simulated geometries. Therefore, a proper criterion for selection of the focus measure operator with the optimized window size and sampling step size is necessary.…”

Section: Introductionmentioning

confidence: 99%

An Improved Shape from Focus Method for Measurement of Three-Dimensional Features of Fuel Nozzles

Hou

Zou

Zhang

et al. 2022

Sensors

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The precise three-dimensional measurement of fuel nozzles is of great significance to assess the manufacturing accuracy and improve the spray and atomization performance. This paper proposes an improved fast shape from focus (SFF) method for three-dimensional measurement of key features of fuel nozzles. In order to ensure the measurement accuracy and efficiency of the SFF, the dispersion of the measured points from a standard flat plane was used to select the optimal combination of the focus measure operator, window size and sampling step size. In addition, an approximate method for the focus measure interval is proposed to improve the measurement efficiency, which uses the peak region of the central pixel to replace the peak region of other pixels. The results show that the proposed method decreased the average computation time of the focus measure by 79.19% for the cone section and by 38.30% for the swirl slot. Compared with a reference laser scanning microscope, the measurement error in length is within 10 μm and the error in angle is within a maximum 0.15°.

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Section: Introductionmentioning

confidence: 99%