Objectives: To compare shade matching skills of color normal males and females. Material and Methods: A total of 174 dental students of both genders (117 females and 57 males, 20 to 25 years old), with no experience in color matching in dentistry, participated in the study. All recruited students passed the Ishihara color vision test for color deficiency, and matched the colors of eight shade t...

Bayer color mosaic sampling scheme is widely used in digital cameras. Given the resolution of CCD sensor arrays, the image quality of digital cameras using Bayer sampling mosaic largely depends on the performance of the color demosaic process. A common and serious weakness shared by all existing color demosaic algorithms is an inconsistency of sample interpolations in different primary color co...

Colonoscopy is currently one of the best methods to detect colorectal cancer. Nowadays, one of the widely used colonoscopes has a monochrome chipset recording successively at 60 Hz R, G, and B components merged into one color video stream. Misalignments of the channels occur each time the camera moves, and this artefact impedes both online visual inspection by doctors and offline computer analy...

Measuring the perceived quality of printed images are important to assess the performance of printers and to evaluate technology advancements. Image quality metrics have been proposed to objectively assess the quality of images, and new metrics are continuously proposed. However, applying these metrics to printed images are not straightforward, since they require a digital input. We present a n...

We conducted a monitor-based subjective study on multilevel halftone. Observers in a halftone preference experiment selected stimuli in a paired comparison design. Images were halftoned using multilevel stochastic screening and multilevel error diffusion. Stimuli were presented on a calibrated monitor from distances equivalent to viewing 300 and 600 dpi prints. We applied Thurstone's law of com...

In the operation of a printing press, color control depends very much on the operator's skill and experience. However, with the development of the color control system by color scale, the conventional operator's skill is being replaced by numerical evaluation of color quality, and productivity is greatly enhanced. Recently, it has been attempted to measure the whole print image and develop a co...

Shell color is not an indication of internal egg quality and says nothing about the nutritive value or the quality of the egg (Flock et al., 2007). However, many consumers who prefer brown eggs, also pay attention to intensity and uniformity of color, and pale or unevenly colored eggs may be rejected. Clearly, reduced variability of eggshell color improves the presentation of eggs at point of s...

Multi-dimensional look up tables (LUTs) are widely employed for color transformations due to its high accuracy and general applicability. Using the LUT model generally involves the color measurement of a large number of samples. The precision and uncertainty of the color measurement will be mainly represented in the LUTs, and will affect the smoothness of the color transformation. This, in turn...

This paper presents a visual color image quality metric assessment with full reference image. The metric is highly based on human visual system properties in order to get the best correspondence with human judgements. Contrary to some others objective criteria, it doesn’t use any a priori knowledge on the type of introduced degradations. So the main interest of the metric is on its ability to p...