1) Goal – Perform preliminary experiment to check the feasibility and evaluate the accuracy of spectral estimation using a digital camera. 2) Background Multi-spectral acquisition and linear methods have been widely used to estimate spectral properties of imaged materials. 1 2 0 0 O , (1) and the object spectral reflectance as r=(r 1 , r 2 , ... r n) T , where the index indicates the set of n w...

Chromatic adaptation transforms are used in imaging systems to map image appearance to colorimetry under different illumination sources. In this paper, the performance of different chromatic adaptation transforms (CAT) is compared with the performance of transforms based on RGB primaries that have been investigated in relation to standard color spaces for digital still camera characterization a...

Crumb color quality characteristics of bread of different compositions (whole grain, rye, barley and diet bread) at 24 hours intervals during three days after bread preparation were investigated by means of a MOM-color 100 tristimulus photo colorimeter, in CIE, CIELab, ANLAB and Hunter systems. The highest value of average reflectance y (%) was found for barley bread (immediately after preparat...

©2004, IS&T—The Society for Imaging Science and Technology are evaluated in which the spatially averaged estimated spectra using imaging are compared with spectra measured using small-aperture refl ection spectrophotometers. Spectra are compared using colorimetric, spectral, and metameric criteria.5 As image data, there is an obvious requirement for viewing the spectral data in a rendered form ...

Most present day color scanners, with red, green, and blue filters, are non-colorimetric. This means that their outputs cannot be linearly transformed into CIE tristimulus values for arbitrary input materials. On the other hand, by restricting oneself to a single class of inputs such as photographic, lithographic, or xerographic materials, very accurate scanner calibrations are possible. In thi...

In this study an improved method for visual gamma correction is developed. Eight half tone patterns were designed to generate relative luminances from 1/9 to 8/9 for each colour channel. A psychophysical experiment was conducted to find the digital count corresponding to each relative luminance by visually matching the half tone background to the uniform colour patch. Both interand intra-observ...

The perceived colour from a surface does not only depend on its optical properties and the illumination. Several studies have demonstrated the simultaneous contrast effect that makes the appearance of coloured patches depend on neighbouring colours. In this study the perceived whiteness of white patches surrounded by induction fields of different shades was evaluated by asking observers to give...

Shellfish have been identified as a potential source of Cryptosporidium infection for humans. The inactivation of Cryptosporidium parvum and other pathogens in raw molluscan shellfish would provide increased food safety for normal and at-risk consumers. The present study identified the efficacy of a non-thermal alternative food-processing treatment, high hydrostatic pressure processing (HPP), o...

One approach to camera characterization is to attempt to recover the spectral properties of the surfaces in a scene and then compute the tristimulus values from these estimated reflectances. This paper addresses the question of whether such spectral-based characterization methods can outperform traditional characterization methods. In this paper we have evaluated three different techniques for ...