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Display Calibration More Precise

with Matrox Xenia Series

Display luminance uniformity is of greatest concern in mammography, and worldwide, luminance uniformity is becoming adopted in more countries to enhance and accurately perform patient diagnosis.

Qubyx PerfectLUM calibration applicationA display which can be corrected to reduce luminance uniformity errors will display medical images with greater precision and conformance to medical display standards as developed by AAPM, DIN and JESRA, to name a few.

A recent white paper from QUBYX Software Technologies reveals that Xenia Series display controller boards together with their calibration software offers an advantage over display calibration using consumer off-the-shelf boards and/or hardware calibration performed within the display.

A LUT is a hardware device that may be included in either a board or a display and used to store a correction or transformation table in order to make appropriate corrections between input and output levels, so that compensation is performed for the display to adequately render an image.

Each entry represents one color and/or gray level and stores one output data level. A higher number of input addresses provides more shades in color or gray which can be displayed by the system. A higher number of output values provides more precision in luminance output (smaller, more detailed or refined steps).

Matrox Xenia Series boards with programmable 8, 10 and 13-bit onboard hardware LUTs offer a higher number of input addresses than consumer off-the-shelf 8-bit graphics boards and a higher number of output values than most displays. Thanks to Xenia's balanced relationship of 8192 input addresses and 8192 output values, Qubyx PerfectLUM calibration application is able to perform delicate corrections without any loss of data while guaranteeing full dynamic range. The Matrox Xenia board has a relative error of only 0.006103515625 % due to its high number of LUT input addresses and relationship to LUT output values. As a result, the luminance output is more precise with the Matrox Xenia Series board and closer to (and in many cases exactly that of) the DICOM GSDF or CIE L* target luminance reproduction.

Extracts from white paper: "Achieving Medical Industry Display Standards Using Advanced Display Controller Boards and Empowered Calibration Application Packages for Medical Imaging" QUBYX Software Technologies LTD - Copyright 2009. Used with permission.