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An image based multi-angle method for estimating reflection geometries of flexible objects

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Gonio-spectrometers and multi-angle spectrophotometers are successfully used for performing multi-angle measurements of non-diffuse materials like metallic inks and paints used in the print and packaging industry and car paint industry. Using a gonio-spectrometer to measure the amount of light reflected at different incident and reflection angles is a time consuming and an expensive process and is mainly performed in laboratories for research purposes.

In order to perform multi-angle planar measurements, at relatively cheaper and faster way, we use a geometrical method which can be used with an image based measurement setup to measure such materials. The image based measurement setup help record the light reflected from the sample, in the digital pixel array sensor. The geometrical method estimates the incident (i) and reflection (r) angles at a given point (P) on the sample surface. It also maps the pixel positions on the camera sensor array to the corresponding point (P) on the sample surface. This information can therefore be used to understand the amount of light incident and reflected from a given point (P) on the sample surface and record it accordingly.

The proposed measurement setup can be used in, for example packaging industry, to perform online gonio-metric measurements during material reproduction process and estimate the incident and reflection angles of homogeneous flexible object materials when measuring light incident and reflected from the sample at different angles.

The results obtained show that the geometrical method corrects for the geometrical distortions and estimate the incident (i) and reflection (r) angles successfully.
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Document Type: Research Article

Publication date: November 3, 2014

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  • CIC is the premier annual technical gathering for scientists, technologists, and engineers working in the areas of color science and systems, and their application to color imaging. Participants represent disciplines ranging from psychophysics, optical physics, image processing, color science to graphic arts, systems engineering, and hardware and software development. While a broad mix of professional interests is the hallmark of these conferences, the focus is color. CICs traditionally offer two days of short courses followed by three days of technical sessions that include three keynotes, an evening lecture, a vibrant interactive (poster) papers session, and workshops. An endearing symbol of the meeting is the Cactus Award, given each year to the author(s) of the best interactive paper; there are also Best Paper and Best Student Paper awards.

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