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BS IEC 62906-5-4:2018 Laser display devices - Optical measuring methods of colour speckle, 2022
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- CONTENTS
- FOREWORD
- 1 Scope
- 2 Normative references
- 3 Terms, definitions, letter symbols and abbreviated terms [Go to Page]
- 3.1 Fundamental terms
- 3.2 Terms related to colour speckle distribution
- 3.3 Terms related to spatial variation
- 3.4 Letter symbols
- 3.5 Abbreviated terms
- 4 Theory of colour speckle [Go to Page]
- 4.1 General
- 4.2 Mechanism for generating colour speckle
- 5 Calculation methods of colour speckle [Go to Page]
- 5.1 General
- 5.2 Measuring method of spectral behaviour of BGR light sources
- 5.3 Target chromaticity
- Figures [Go to Page]
- Figure 1 – Two speckle measuring methods and their flow charts
- Figure 2 – Target chromaticity and colour gamut
- Figure 3 – SB,G,R(λ) with an FWHM of 2 nm
- 5.4 Adjustment of BGR power ratio
- 5.5 Calculation method (a) using BGR speckle contrast Cs-B, Cs-G, Cs-R [Go to Page]
- 5.5.1 General
- Figure 4 – Adjustment method of BGR power ratio [Go to Page]
- 5.5.2 Examples of measured distributions
- Figure 5 – Colour speckle distribution for CsB = 100 %, CsG = 100 %, CsR = 100 %
- Figure 6 – Photometric speckle distribution for CsB = 100 %, CsG = 100 %, CsR = 100 %
- Figure 7 – Colour speckle distribution for CsB = 50 %, CsG = 50 %, CsR = 50 %
- Figure 8 – Photometric speckle distribution for CsB = 50 %, CsG = 50 %, CsR = 50 %
- Figure 9 – Colour speckle distribution for CsB = 10 %, CsG = 10 %, CsR = 10 %
- 5.6 Evaluation metrics
- Figure 10 – Photometric speckle distribution for CsB = 10 %, CsG = 10 %, CsR = 10 %
- 5.7 Calculation method (b) using the measured spatial distribution of BGR monochromatic speckles [Go to Page]
- 5.7.1 General
- 5.7.2 Examples of measured distributions
- Tables [Go to Page]
- Table 1 – Values of measurement metrics for the calculated examples
- Figure 11 – Colour speckle distribution for CsB = 9,2 %, CsG = 9,7 %,CsR = 9,2 % obtained by method (b) [Go to Page]
- 5.7.3 Comparison between methods (a) and (b)
- Figure 12 – Colour speckle distribution for CsB = 9,2 %, CsG = 19,2 %,CsR = 23,2 % obtained by method (b)
- Figure 13 – Colour speckle distribution for CsB = 9,2 %, CsG = 9,7 %,CsR = 9,2 % obtained by method (a)
- Figure 14 – Colour speckle distribution for CsB = 9,2 %, CsG = 19,2 %,CsR = 23,2 % obtained by method (a) [Go to Page]
- 5.7.4 Elimination of the background effects
- Table 2 – Values of measurement metrics for the examples in Figure 11 to Figure 14
- Figure 15 – Raw data of BGR speckle distributions (upper row) and post-processed data (lower row) for BGR monochromatic speckles (left: B, centre: G, right: R)
- Figure 16 – Colour speckle distribution directly using the raw data in Figure 15
- Figure 17 – Colour speckle distribution for CsB = 16,2 %, CsG = 17,4 %, CsR = 17,3 % obtained by indirect measuring method (a)
- Table 3 – Values of measurement indices for the examples in Figure 16 and Figure 17
- 5.8 Error analysis based on data size
- Figure 18 – Calculated average chromaticity values of the colour speckle distribution with respect to data size for CsB = CsG = CsR = 80 %
- Figure 19 – Calculated average values of the normalized speckle illuminance speckle distribution and the normalized monochromatic speckle intensity distribution with respect to data size for CsB = CsG = CsR = 80 %
- Figure 20 – Calculated average chromaticity values of the colour speckle distribution with respect to data size for CsB = CsG = CsR = 60 %
- Figure 21 – Calculated average values of the normalized speckle illuminance speckle distribution and the normalized monochromatic speckle intensity distribution with respect to data size for CsB = CsG = CsR = 60 %
- Figure 22 – Calculated average chromaticity values of the colour speckle distribution with respect to data size for CsB = CsG = CsR = 40 %
- Figure 23 – Calculated average values of the normalized speckle illuminance speckle distribution and the normalized monochromatic speckle intensity distribution with respect to data size for CsB = CsG = CsR = 40 %
- Figure 24 – Calculated average chromaticity values of the colour speckle distribution with respect to data size for CsB = CsG = CsR = 20 %
- 6 Direct measuring methods of colour speckle [Go to Page]
- 6.1 General
- Figure 25 – Calculated average values of the normalized speckle illuminance speckle distribution and the normalized monochromatic speckle intensity distribution with respect to data size for CsB = CsG = CsR = 20 %
- 6.2 Fundamental design of LMD for colour speckle measurement
- Figure 26 – Example of LMDs using XYZ filters for colour speckle measurement
- 6.3 Colour speckle measuring method using LMD with XYZ filters
- Figure 27 – Example of LMDs using BGR filters for colour speckle measurement
- 6.4 Colour speckle measuring method using LMD with BGR filters
- Figure 28 – Example of measurement geometriesfor colour speckle using an LMD with XYZ filters
- 7 Measuring methods related to spatial variation [Go to Page]
- 7.1 General
- 7.2 Angular colour speckle variation
- Figure 29 – Example of measurement geometriesfor colour speckle using an LMD with BGR filters
- 7.3 Photometric speckle contrast uniformity/non-uniformity
- Figure 30 – Representation of the viewing direction, or direction of measurement, defined by the angle of inclination θ, and the angle of rotation (azimuth angle ( )in a polar coordinate system
- 7.4 Colour speckle variance/covariance non-uniformity
- Annex A (informative) Complementary explanation of colour speckle [Go to Page]
- Figure A.1 – Photograph of colour speckle
- Annex B (informative) Examples of colour speckle distributions [Go to Page]
- B.1 Colour speckle distributions (one of the BGR: 90 %, the others: 1 %)
- Figure B.1 – Colour speckle distribution for CsB = 90 %, CsG = 1 %, CsR = 1 %
- Figure B.2 – Photometric speckle distribution for CsB = 90 %, CsG = 1 %, CsR = 1 %
- Figure B.3 – Colour speckle distribution for CsB = 1 %, CsG = 90 %, CsR = 1 %
- Figure B.4 – Photometric speckle distribution for CsB = 1 %, CsG = 90 %, CsR = 1 %
- B.2 Colour speckle distributions (two of the BGR: 90 %, the other: 1 %)
- Figure B.5 – Colour speckle distribution for CsB = 1 %, CsG = 1 %, CsR = 90 %
- Figure B.6 – Photometric speckle distribution for CsB = 1 %, CsG = 1 %, CsR = 90 %
- Figure B.7 – Colour speckle distribution for CsB = 90 %, CsG = 1 %, CsR = 90 %
- Figure B.8 – Photometric speckle distribution for CsB = 90 %, CsG = 1 %, CsR = 90 %
- Figure B.9 – Colour speckle distribution for CsB = 1 %, CsG = 90 %, CsR = 90 %
- Figure B.10 – Photometric speckle distribution for CsB = 1 %, CsG = 90 %, CsR = 90 %
- Figure B.11 – Colour speckle distribution for CsB = 90 %, CsG = 90 %, CsR = 1 %
- Figure B.12 – Photometric speckle distribution for CsB = 90 %, CsG = 90 %, CsR = 1 %
- Annex C (informative) Calibration of XYZ errors [Go to Page]
- C.1 General
- C.2 Formulation of XYZ mismatches
- Figure C.1 – Deviated values (marker points) and ideal colour matching functions
- Figure C.2 – Correct plot by spectral measurements and plot with XYZ errors
- Table C.1 – Mismatch coefficients
- C.3 Calibration of the mismatched XYZ errors using the true BGR chromaticity values
- Bibliography [Go to Page]