Last edited by Maramar
Wednesday, August 12, 2020 | History

4 edition of Characterization of luminance probe for accurate contrast measurements in medical displays found in the catalog.

Characterization of luminance probe for accurate contrast measurements in medical displays

Characterization of luminance probe for accurate contrast measurements in medical displays

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Published by U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology in Gaithersburg, Md .
Written in English

    Subjects:
  • Information display systems,
  • Contrast sensitivity (Vision),
  • Optical measurements,
  • Diagnostic imaging

  • Edition Notes

    StatementEdward F. Kelley, Aldo Badano
    SeriesNISTIR -- 6974
    ContributionsBadano, Aldo, National Institute of Standards and Technology (U.S.)
    The Physical Object
    FormatMicroform
    Pagination13 p.
    Number of Pages13
    ID Numbers
    Open LibraryOL13632351M
    OCLC/WorldCa52786498

      The small-spot contrast ratio is defined as follows: where L w is the luminance from the small spot at the maximum luminance setting, L b is the background luminance, and L ss is the luminance from the small black spot (, 16). This metric relates to the ability to modulate signal in dark areas of the screen with bright areas elsewhere in the. Need a Quote? Contact Us Today ISO/IEC accredited by NVLAP (NVLAP lab code ) Calibration Accreditation - Enter lab code here to view our ISOIEC / NVLAP Accreditation Certificate and Scope on the NIST website.

      The only statistically significant difference was between measurements made with a cd.m −2 surround compared to those made with , 9, or 30 cd.m −2 surrounds when tested at a viewing distance of 4 m. The higher luminance surround produced higher levels of contrast sensitivity. Use the Luminance Contrast Calculator. Luminance Calculator: Use for cd/m2 – AS – On-site Testing. Onsite luminance contrast testing is performed using as per the equipment stated in AS & AS a single reflex lens photometer which will give a measurement in cd/m2.

    Uniformity of display luminance and color is important for comfort and good perception of the information presented on the display. Although display technology has developed and improved a lot over the past years, different types of displays still present a challenge in selected applications, e.g. in medical use or in case of multi-screen installations.   The colorimeters are X-Rite i1 Display Pro (Jan. ) and Datacolor Spyder 5. I have used both HCFR and DisplayCAL for testing. For example, on an AMVA-based computer monitor, the values reported by HCFR (using the contrast measurement tool) were: with Spyder 5: black: , white: , contrast: on/off=, ANSI=


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Characterization of luminance probe for accurate contrast measurements in medical displays Download PDF EPUB FB2

Characterization of Luminance Probe for Accurate Contrast Measurements in Medical Displays Edward F. Kelley Electricity Division Electronics and Electrical Engineering Laboratory National Institute of Standards and Technology Gaithersburg, MD Aido Badano Center for Devices and Radiological Health Food and Drug Administration.

Get this from a library. Characterization of luminance probe for accurate contrast measurements in medical displays. [Edward F Kelley; Aldo Badano; National Institute of.

probes to measure small-spot contrast ratios. METHODS In this work, we compare four probes constructed after the design described in Ref. A simplied diagram of the main aspects of that design is shown in Fig.

Probe A is the device assembled in Luminance Probes for Contrast Measurements in Medical DisplaysCited by: 5. There are a number of studies that investigate luminance levels and contrast perception for X-ray images and various tasks, such as breast cancer diagnosis in mammograms [Apelt et al.,Apelt et al., Apelt et al., ].

Angular dependence of the luminance and contrast in medical monochrome liquid crystal displays Aldo Badanoa) Center for Devices and Radiological Health, Food and Drug Administration, Twinbrook Parkway, Rockville, Maryland Michael J.

Flynn Department of Radiology, Henry Ford Health System, Detroit, Michigan The mean difference between built‐in and external luminance measurements was % and % for displays with less than 25 and greater than 25 BLH, respectively, with a statistically significant difference in the means (p.

Luminance Contrast:: Testing of displays and video screens for emission of visible light vs reflected ambient light. This is done to determine visibility of the display image and requires a uniform sou Luminance Meter Calibration:: Usually measured with an imaging photometer know as a luminance meter or spectroradiometer.

To calibrate these. The light output of direct view displays is quantified in terms of luminance, which is the major parameter for display measurements and characterization. This is because many measurement procedures rely on this parameter, such as maximum luminance, Contrast Ratio, uniformity, lifetime, gray scale, and viewing-angle dependency.

Usually measured with an imaging photometer know as a luminance meter or spectroradiometer. To calibrate these instruments an accurate source of luminance is required.

Labsphere offers both source and target based solutions NMI traceable luminance calibrations. one that involves measuring the angular changes of the contrast,5 and calculating the luminance con- trast (DL/L) as a function of the gray level or JND index, according to the recommendations of the.

Contrast sensitivity is the inverse of the contrast threshold, which is the minimum amount of contrast that a target on a uniform background must have in order for us to see it.

We've seen that contrast is a measure of the difference between the luminance of a target and the luminance of its background, and that there are several definitions of. The display measurement equipment required to carry out these measurements is presented in Chap.

with test patterns provided in Chap. All these measurements can be performed under varying conditions such as changing viewing angle (Chap. ) or ambient light levels (Chap. Get highly accurate measurements using the CSA spectroradiometer. The device has the capacity to measure luminances with ranges that reach down to cd/m2.

It can also contrast measurements at ranges that reach 1,*4. You can use the CSA with a variety of displays and light sources. The minimum luminance contrast values in Section of AS/NZS specifies the minimum luminance contrast values and provides testing methods that are suitable for the measurement of the Light Reflectance Value (LRV) of a material that is used to determine the luminance contrast with respect to another material.

For instance, the American Association of Physicists in Medicine recommends the major acceptable criteria about luminance evaluation for primary- and secondary-class displays as maximum luminance should be greater than and cd/m 2, luminance ratio of maximum and minimum luminance should be greater than andand contrast.

The decreases in detectibility have been characterized in medical displays with respect to grayscale but not color images [3].

to measure angular contrast and luminance in one- three- five. which puts the measurement in context. • For luminance measurement, the field of view (FOV) of the sens or must be smaller than the source. The FOV of a luminance meter is about 1. The FOV of a digital camera pixel is on the order of times smaller, so it can measure small area light sources such as individual light emitting diodes.

These. • The surroundings of the luminance measurement are recorded, which puts the measurementin context. • For luminance measurement, the field of view (FOV) of the sensor must be smaller than the source.

The FOV of a luminance meter is about 1. The FOV of. Peak luminance is the easiest characteristic to measure and describes the highest luminance value attainable by the display.

Contrast ratio, by the very definition of the word, measures the ratio between a bright and dark section of an image. A common way to measure contrast is.

The StellarNet spectrometers are great tools for low cost, routine analysis of all types of displays and monitors. The increasing use and popularity of flat panel displays for televisions, computer monitors, laptops, automotive displays, cell phones, and mobile devices of all kinds requires accurate, fast, and cost-effective methods for measuring color, luminance, and various other output.

30% luminance contrast Minimum 30% luminance contrast between the toilet seat within Unisex Accessible toilet and the floor, pan or wall. Signage. 30% luminance contrast 30% luminance contrast between letters/symbols and sign background colour.

30% luminance contrast between sign background and wall colour on which it is mounted. Although the probe is highly collimated, the contamination of luminance measurements by stray light is typically in the order of 10 –5 and depends on the distance between the probe and the emitting surface.

5 To minimize the contribution of this effect, automatic corrections based on the angle with respect to the display normal are made in.A. Badano and J. Kanicki, “Characterization of Crosstalk in High-Resolution Active-Matrix Liquid Crystal Displays for Medical Imaging,” Proc.

of SPIE, vol.pp.R. Hattori, Y. Kuroki and J. Kanicki, “ Analog-Circuit Simulation of the Current-Programmed Active-Matrix Pixel Electrode Circuits Based on Poly-Si TFT for.