BS EN 61966-6:2006 – Multimedia systems and equipment — Colour measurement and management — Part 6: Front projection displays
1 Scope
This part of IEC 61 966 defines input test signals, measurement conditions, methods of measurement and reporting of the measured data, to be used for colour characterization and colour management of front projection displays in multimedia systems.
Colour control within equipment is outside the scope of this part. It does not specify limiting values for various parameters.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60050-845:1 987, International Electrotechnical Vocabulary (IEV) – Chapter 845:
Lighting/ CIE 1 7.4: 1 987, International Lighting Vocabulary (Joint IEC/CIE publication)
IEC 61 947 (all parts), Electronic projection – Measurement and documentation of key performance criteria
ISO/CIE 1 0527:1 991 , CIE standard colorimetric observers
CIE 1 5.2:1 986, Colorimetry
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-845 and CIE 1 7.4, as well as the following, apply.
3.1
background
data corresponding to an image surrounding the target colour patch to be measured
3.2
colour control
effort to convert equipment-dependent colour image data to equipment-independent data for a specific colour space including tone characteristics
3.3
colour patch, test area
square colour image on a virtual screen of the front projection display subject to be measured for colour reproduction, in which input data for the red, green and blue channels are kept constant within the image area
3.4
CRT
colorimetrically well-controlled equipment using cathode ray tubes to present colour images with digital inputs for reference
3.5
effective screen height
vertical dimension of the effective screen area
3.6
effective screen area
area where a picture can be produced
3.7
normalized (image) signal
input signal normalized by its full-scale value, whose level is of interest in calculation and evaluation of colour control function within front projection display (see also equation (1 ) in 5.3)
3.8
uncertainty (of measurement)
parameter, associated with the result of a measurement, that characterizes the dispersion of the values that could reasonably be attributed to the particular quantity subject to measurement (see also the IEC Guide to the expression of uncertainty in measurement,1 995)
3.9
virtual screen
perfect reflecting diffuser-to-image input data
4 Letters and symbols
The notations consistently adopted in this part of IEC 61 966 are summarized below.
A display area ratio
N number of bits in digital data for each channel
M maximum integer for non-negative N -bits system; M = 2 N
−1D digital data applied for red channel
RD digital data applied for green channel
GD digital data applied for blue channel
BR normalized input level to red channel
G normalized input level to green channel
B normalized input level to blue channel
BS EN 61966-6:2006 – Multimedia systems and equipment — Colour measurement and management — Part 6: Front projection displays