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• W4384408532 abstract "Shape-from-focus depth measurement is widely used in equipment manufacturing, biomedicine, heritage conservation, engineering measurement, etc. However, the acquisition of multi-focus image sequence is not very flexible and time-consuming in conventional shape from focus. Here, a novel depth measurement from shape from focus method based on ultrafast optical axial scanning was proposed. An electronically tunable lens was used to achieve high-speed focus shift, by synchronizing a CCD with the electronically tunable lens, multi-focus image sequence can be acquired at high speed (up to 2.5 ms). The focusing area of each multi-focus image was extracted by the energy of image gradient operator. Finally, the motionless depth measurement can be achieved. A tilted marker pen was used to test the performance of the depth measurement, the results show that the depth resolution of the proposed method is measured to be ∼3.2 cm in a depth range of ∼24 cm. The feasibility of the proposed method was verified using misplaced portrait sculptures. This method will further expand the application of depth measurement from shape from focus in human–computer interaction, 3D shape measurement, and augmented reality." @default.
• W4384408532 created "2023-07-16" @default.
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• W4384408532 date "2023-11-01" @default.
• W4384408532 modified "2023-09-27" @default.
• W4384408532 title "Motionless shape-from-focus depth measurement via high-speed axial optical scanning" @default.
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• W4384408532 doi "https://doi.org/10.1016/j.optcom.2023.129756" @default.
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