PURPOSE This study aimed to quantify the shift of colorimetric values in the Ishihara pseudoisochromatic test with aging of the plates. METHODS Three sets of Ishihara pseudoisochromatic plates with different published dates (printed in 1971, 1983 and 2001) were tested. Positions matching 32 dots with 13 colors were chosen from each set and the colorimetric values with the CIELAB and HSB/HLS c...

KARL STORZ presents its new full HD camera platform IMAGE 1 SPIES, a new milestone in endoscopic imaging. IMAGE 1 SPIES stands for Storz professional image enhancement system and provides users with versatile visualization options for operation and diagnosis. Three innovative technologies for visualization are integrated in the new camera system: SPIES CLARA, SPIES CHROMA and SPIES SPECTRA. SPI...

Large music collections, ranging from thousands to millions of tracks, are unsuited to manual searching, motivating the development of automatic search methods. When two musical groups perform the same underlying song or piece, these are known as ‘cover’ versions. We describe a system that attempts to identify such a relationship between music audio recordings. To overcome variability in tempo,...

The angle resolved reflectance factor of matte samples is measured with a goniophotometer and simulated using radiative transfer theory. Both measurements and simulations display the same characteristic dependence of the reflectance factor on the observation angle. The angle resolved reflectance spectra are translated to CIELAB col...

An image difference structure is created that include of image regularization, feature derivation, and feature grouping. Based on this structure image difference measure is created by selecting exact implementations for each of the steps. An image difference prediction is then calculated using image difference features (IDFs) that are derived from the images. The input images are then regulariz...

In this paper, we present a prototype of an online tool for real-time chord recognition, leveraging the capabilities of new web technologies such as the Web Audio API, and WebSockets. We use a Hidden Markov Model in conjunction with Gaussian Discriminant Analysis for the classification task. Unlike approaches to collect data through web-scraping or training on hand-labeled song data, we generat...

A large-scale investigation into the perception of contrast in color images was performed. Psychophysical experiments were performed to determine the influence of image lightness, chroma, and sharpness transforms on perceived image contrast and observer preference. The influence of these transforms on perceived contrast was investigated separately by independent soft-copy, paired-comparison tes...