The color properties of a reflective CMYK module using polymer‐dispersed liquid crystal (PDLC)

Abstract

A reflective CMYK (cyan, magenta, yellow, and black) module using polymer‐dispersed liquid crystal (PDLC) is investigated for multi‐color reflective display. Combined with the electro‐optical properties and visible spectral reflectivity of PDLC films, the color properties of the reflective CMYK module were evaluated in terms of the Uniform Color Space‐CIE 1976 L*a*b*. It is found that the blue light reflectivity of the PDLC films is lower than green light and red light reflectivity. With the increase of the voltage applied on PDLC, the color lightness of the CMYK module generally decreases, while the color saturation increases. When the voltage changed from 0 to 70 V with a 5‐V change amplitude, modules C, M, Y, and K severally exhibit at least five, six, three, and seven colors.

Automatic Measurement of Blood Vessel Angles in Immunohistochemical Images of Liver Cancer

“…However, due to the strong correlation in the three color space R\G\B, it is difficult to achieve color separation for immunohistochemical positive, negative and background using the RGB color model. Some scholars have transformed the RGB color model into a HSI model [3] or a CMYK model [4] for multi-color image segmentation, but these methods rely on the thresholding setting, which can easily lead to the loss of a large amount of information. In order to solve the problem of separation of various colors in the IHC image, Ruifrok proposed a method of color deconvolution [6] to separate different colored tissue components and form multiple single-color images.…”