17.4: Comprehensive Survey on Viewing Angle Measurement Devices: A Theoretical Study

The quantification of material appearance is important in product design. In particular, the sparkle impression of metallic paint used mainly for automobiles varies with the observation angle. Although several evaluation methods and multi-angle measurement devices have been proposed for the impression, it is necessary to add more light sources or cameras to the devices to increase the number of evaluation angles. The present study constructed a device that evaluates the multi-angle sparkle impression in one shot and developed a method for quantifying the impression. The device comprises a line spectral camera, light source, and motorized rotation stage. The quantification method is based on spatial frequency characteristics. It was confirmed that the evaluation value obtained from the image recorded by the constructed device correlates closely with a subjective score. Furthermore, the evaluation value is significantly correlated with that obtained using a commercially available evaluation device.

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Accuracy of hoof angle measurement devices in comparison with digitally analysed radiographs

Equine Veterinary Education ◽

10.1111/j.2042-3292.2005.tb00401.x ◽

2010 ◽

Vol 17 (6) ◽

pp. 319-322 ◽

Cited By ~ 15

Author(s):

M. Moleman ◽

M. C. V. van Heel ◽

A. J. M. van den Belt ◽

W. Back

Keyword(s):

Angle Measurement ◽

Measurement Devices

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Viewing Angle Measurement of Polymer-Dispersed Liquid Crystal

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.181-182.79 ◽

2011 ◽

Vol 181-182 ◽

pp. 79-82

Author(s):

Xing Fang Jiang ◽

Shu Xin Wu

Keyword(s):

Liquid Crystal ◽

Liquid Crystals ◽

Angle Measurement ◽

Driving Voltage ◽

Viewing Angle ◽

Liquid Crystal Device ◽

Polymer Dispersed Liquid Crystal ◽

Polymer Dispersed Liquid Crystals ◽

Voltage Dependent ◽

Polymer Dispersed

Polymer-dispersed liquid crystals are one kind of important devices. With a He-Ne laser and a photoelectric detector, we measured the driving-voltage dependent and viewing-angle dependent transmission for a polymer-dispersed liquid crystal device. Our results showed that the polymer-dispersed liquid crystal device worked at the driving voltage of 4 V and the effective viewing angle of about 65 degree.

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One-shot Multi-angle Measurement Device for Evaluating the Sparkle Impression

Journal of Imaging Science and Technology ◽

10.2352/j.imagingsci.technol.2019.63.6.060401 ◽

2019 ◽

Vol 63 (6) ◽

pp. 60401-1-60401-8 ◽

Cited By ~ 3

Author(s):

Shuhei Watanabe

Keyword(s):

Spatial Frequency ◽

Product Design ◽

Angle Measurement ◽

Observation Angle ◽

Light Sources ◽

Quantification Method ◽

Material Appearance ◽

Subjective Score ◽

Measurement Devices ◽

Rotation Stage

Abstract The quantification of material appearance is important in product design. In particular, the sparkle impression of metallic paint used mainly for automobiles varies with the observation angle. Although several evaluation methods and multi-angle measurement devices have been proposed for the impression, it is necessary to add more light sources or cameras to the devices to increase the number of evaluation angles. The present study constructed a device that evaluates the multi-angle sparkle impression in one shot and developed a method for quantifying the impression. The device comprises a line spectral camera, light source, and motorized rotation stage. The quantification method is based on spatial frequency characteristics. It was confirmed that the evaluation value obtained from the image recorded by the constructed device correlates closely with a subjective score. Furthermore, the evaluation value is significantly correlated with that obtained using a commercially available evaluation device.

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