Measurement of the visual perceptibility of sink marks in injection molded parts
Research output: Thesis › Master's Thesis
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2011. 79 p.
Research output: Thesis › Master's Thesis
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TY - THES
T1 - Measurement of the visual perceptibility of sink marks in injection molded parts
AU - Haba, Dietmar
N1 - embargoed until 27-05-2016
PY - 2011
Y1 - 2011
N2 - The aim of this work was to contribute to the improvement of a methodology for the evaluation of the visual perceptibility of sink marks on surfaces of injection molded parts by machine vision. Based on previous research work on the detection of surface defects a new methodology for the evaluation of the visibility of sink marks using digital images was developed. The methodology uses a surface model to approximate the intensity matrix of captured images. Calculated surface fit functions were used to determine the amplitudes of the second derivatives (ASD) for quantifying the perceptibility of the sink marks. Injection molding parts produced by using different predefined processing parameters were inspected and the influence of given parameters on the visual perceptibility of the sink marks was evaluated. ASD emerged to be an appropriate parameter for the application in a machine vision system. The results partly contradict findings of other authors.
AB - The aim of this work was to contribute to the improvement of a methodology for the evaluation of the visual perceptibility of sink marks on surfaces of injection molded parts by machine vision. Based on previous research work on the detection of surface defects a new methodology for the evaluation of the visibility of sink marks using digital images was developed. The methodology uses a surface model to approximate the intensity matrix of captured images. Calculated surface fit functions were used to determine the amplitudes of the second derivatives (ASD) for quantifying the perceptibility of the sink marks. Injection molding parts produced by using different predefined processing parameters were inspected and the influence of given parameters on the visual perceptibility of the sink marks was evaluated. ASD emerged to be an appropriate parameter for the application in a machine vision system. The results partly contradict findings of other authors.
KW - sink mark
KW - perceptibility
KW - visibility
KW - surface defect
KW - injection molding
KW - Einfallstelle
KW - Sichtbarkeit
KW - Wahrnehmbarkeit
KW - Oberflächenfehler
KW - Spritzguss
M3 - Master's Thesis
ER -
