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Forging measurement using passive stereo vision
Vítek, Petr ; Mendřický, Radomír (referee) ; Hurník, Jakub (advisor)
The measurement of forgings in the hot state allows for the adjustment of their dimensions and shape, which increases the efficiency of the production process, energy savings and less technological additions of material. A possible alternative to conventional approaches for measuring hot forgings is the application of passive stereovision, which is the focus of this paper. The objectives are to determine the accuracy of this approach with respect to conventional conditions, to highlight the scale structure for the detection of significant points and to select a method for surface detection and reconstruction. The proposed method allows surface reconstruction with an accuracy worse by one order of magnitude, compared to measurements under normal conditions. In a measurement volume of 0.3 m3, the standard deviation of points in the space of 0.28 mm was determined. A band-pass filter transmitting green light spectrum was chosen to represent the forging structure based on the study of spatial frequencies and experimental testing. The KAZE method achieved the highest number of detected feature points on the forging surface.
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Forging measurement using passive stereo vision
Vítek, Petr ; Mendřický, Radomír (referee) ; Hurník, Jakub (advisor)
The measurement of forgings in the hot state allows for the adjustment of their dimensions and shape, which increases the efficiency of the production process, energy savings and less technological additions of material. A possible alternative to conventional approaches for measuring hot forgings is the application of passive stereovision, which is the focus of this paper. The objectives are to determine the accuracy of this approach with respect to conventional conditions, to highlight the scale structure for the detection of significant points and to select a method for surface detection and reconstruction. The proposed method allows surface reconstruction with an accuracy worse by one order of magnitude, compared to measurements under normal conditions. In a measurement volume of 0.3 m3, the standard deviation of points in the space of 0.28 mm was determined. A band-pass filter transmitting green light spectrum was chosen to represent the forging structure based on the study of spatial frequencies and experimental testing. The KAZE method achieved the highest number of detected feature points on the forging surface.
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