Carlo Casale

P‐32: LED Backlight System for Medical Imaging on LCD Monitors

Nowadays products with LED backlight are entering the consumer and semi-professional markets where wide color gamut is essential. In this paper a new LED backlight solution suitable for medical imaging application will be described where the requirements are mainly related to luminance and color accuracy and white point tuning.

Grayscale standard display function on LCD color monitors

Currently, as a rule, digital medical systems use monochromatic Liquid Crystal Display (LCD) monitors to ensure an accurate reproduction of the Grayscale Standard Display Function (GSDF) as specified in the Digital Imaging and Communications in Medicine (DICOM) Standard. As a drawback, special panels need to be utilized in digital medical systems, while it would be preferable to use regular color panels, which are manufactured on a wide scale and are thus available at by far lower prices. The method proposed introduces a temporal color dithering technique to accurately reproduce the GSDF on color monitors without losing monitor resolution. By exploiting the characteristics of the Human Visual System (HVS) the technique ensures that a satisfactory grayscale reproduction is achieved minimizing perceivable flickering and undesired color artifacts. The algorithm has been implemented in the monitor using a low-cost Field Programmable Gate Array (FPGA). Quantitative evaluations of luminance response on a 3 Mega-pixel color monitor have shown that the compliance with the GSDF can be achieved with the accuracy level required by medical applications. At the same time the measured color deviation is below the threshold perceivable by the human eye.

P-52: LightFrame™: Natural Content Enhancement in LCD Monitors

Desktop PC monitors are usually optimized for displaying synthetic images and office productivity images. With the LightFrame™ technology an optimal reproduction of non-synthetic images like video sequences or photos can be achieved without compromising the remaining areas displayed on the desktop. The LightFrame™ technology has been recently introduced through innovative image enhancement techniques implemented in LCD displays by means of a flexible proprietary device.