Flat Panel LCD Research Articles

Calibrated color mapping between LCD and CRT displays: A case study

AbstractThe primary goal of a color characterization model is to establish a mapping from digital input values di (i = R,G,B) to tristimulus values such as XYZ. A good characterization model should be fast, use a small amount of data, and allow for backward mapping from tristimulus to di. The characterization models considered here are for the case of an end user who has no direct knowledge of the internal properties of the display device or its device driver. Three characterization models tested on seven different display devices are presented. The characterization models implemented in this study are a 3D look up table (LUT) (Raja Balasubramanian, Reducing the Cost of Lookup Table Based Color Transformations, Proc IS&T/SID 7th Color Imaging Conference 1999;44:321–327), a linear model (Fairchild MD, Wyble DR. Colorimetric Characterization of the Apple Studio Display (Flat Panel LCD). Munsell Color Science Laboratory Technical Report, 1998), and the masking model (Tamura N, Tsumura N, Miyake. Masking Model for accurate colorimetric characterization of LCD. Proc IS&T/SID 10th Color Imaging Conference 2002;312–316). The devices include two CRT monitors, three LCD monitors, and two LCD projectors. The results of this study indicate that a simple linear model is the most effective and efficient for all devices used in the study. A simple extension to the linear model is presented, and it is demonstrated that this extension improves white prediction without causing significant errors for other colors. © 2005 Wiley Periodicals, Inc. Col Res Appl, 30, 438–447, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/col.

Experiences in moving from CRT to flat panel LCD monitors for diagnostic PACS workstations

Experiences in moving from CRT to flat panel LCD monitors for diagnostic PACS workstations

Evaluation of three different resolution workstations for reporting computerised radiography mammographic images

Using Fuji computerised radiography and a General Electric PACS our unit now reports soft copy mammography images. These are available for reporting on three monitors, a Pathspeed Diagnostic 2A workstation with two monitors each with 1728 × 2304 pixel resolution, a Pathspeed Diagnostic 2B with two monitors each with 1200 × 1600 pixel resolution and an image review workstation (IRW), which constitutes a Dell PC with a 17 flat panel LCD screen with 1024 × 768 pixel resolution. Mammography reporting has traditionally been felt to require the best possible resolution. This study has been designed to show whether or not this is necessary. We have evaluated standard mammography phantom images (TORMAS and TORMAM) and a set of 50 mammograms with known calcification to determine the resolution required for reporting CR mammography. This has implications for other units interested in computerised radiography as the costs of the three reporting workstations range from £1,000 to £41,000.