1 May 2012 View-through characterization of translucent fabrics based on opto-digital image analysis
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Abstract
Translucent fabrics transmit light but provide sufficient diffusion to eliminate perception of distinct images. Traditional translucent woven fabrics include organdie, silk chiffon and muslin cotton, among many others. When such materials are used in curtains they provide even light transmission, solar protection and natural lighting, with a wide range of degrees of view-through. Since all these properties can be referred to the concepts of privacy, space and boundary, they are highly appreciated in interior design and architecture. The conventional metrics used to characterize a translucent fabric are the UV or Visible light transmission, the cover factor and the shading coefficient. In this work we propose to use other metrics commonly utilized to characterize imaging systems such as the Modulation Transfer Function (MTF). When looking through a curtain, the translucent fabric can be modeled as a low-pass filter that is combined with human eye imaging system. We replace our visual system by a high-quality still photographic camera. The MTF curve allows one to characterize the view-through performance of the translucent fabric in a more realistic way than the simple light transmittance, cover factor or shading coefficient. Two object tests, placed at a distance from the fabric, have been used to experimentally derive the MTF of the whole imaging system (translucent fabric and camera): a USAF test and a Slanted Edge (ES) test. In the latter case the Line Spread Function (LSF) is firstly obtained and the MTF estimated. The method has been applied to a set of translucent fabrics with different thread diameters and densities. From the MTF curves obtained using both tests, the transparency of the fabrics is objectively and quantitatively characterized in terms of view-through. The results are presented and discussed.
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Jaume Escofet, Jaume Escofet, Carles Mitjà, Carles Mitjà, Miquel Ralló, Miquel Ralló, Maria S. Millán, Maria S. Millán, } "View-through characterization of translucent fabrics based on opto-digital image analysis", Proc. SPIE 8436, Optics, Photonics, and Digital Technologies for Multimedia Applications II, 843616 (1 May 2012); doi: 10.1117/12.922329; https://doi.org/10.1117/12.922329
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