New features of evalglare
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1 New features of evalglare Evalglare A Radiance based tool for glare evaluation Jan Wienold, Fraunhofer-Institut für Solare Energiesysteme ISE
2 Content Introduction Known problems with 0.9x versions New features of the 1.08 version View type handling Supported view types Low light correction Age correction Calculation of vertical illuminance only Disability glare calculation Cutting field of view based on Guth Direction vector of glare sources Tiny other changes
3 50% glazing 25% glazing 90% glazing First study 2006: User Assessments: 2 sites (D,DK), 3 window sizes, 3 shadings 74 subjects, more than 110h tests, about 50 days 349 different situations
4 Tested three shading devices White Venetian blinds 80mm, convex, r=.84 D (sunny), DK (sunny) Specular Venetian blinds 80mm, concave, ρ=.95 D (sunny),dk (cloudy) Vertical foil lamellas τ=0.02 D (sunny)
5 Luminance camera with fish eye lens Vertical illuminance sensor at eye level
6 Daylight glare probability DGP DGP Combination of the vertical eye illuminance with modified glare index formula L = c ω 2 s, i s, i 1 Ev + c2 log(1 + ) + a 2 1 i Ev Pi E v : L s : vertical Eye illuminance [lux] Luminance of source [cd/m²] ω s : solid angle of source [-] P: Position index [-] c c c a c 3 = = = 0.16 =
7 Correlation between DGP and probability of persons disturbed 100% Strong correlation Logistic regression: p= Much stronger than for all other metrics Probability of disturbed persons 90% 80% 70% 60% 50% 40% 30% 20% 10% Total responses: 349 Number of responses per DGP-class: 29 R 2 = 0.94 DGP ± Standard deviation of DGP ± Standard deviation of binomial distribution Valid for DGP 0.2 E v 380 lux 0% Daylight Glare Probability DGP
8 What does evalglare? Open Questions Detect glare sources Calculate solid angles from pixels/glare sources Calculate vertical illuminance from image Calculate various glare metrics (DGP, UGR, VCP, DGI, CGI Can be used also for calculating average luminance of surfaces (window..) Dark situations? Influence of age on glare perception? DGP also valid for fabrics?
9 Four year research project User assessments with different age groups User assessments with 2 fabric types User assessments with reduced transmission Luminance camera with fish eye lens
10 Content Introduction Known problems with 0.9x versions New features of the 1.08 version View type handling Supported view types Low light correction Age correction Calculation of vertical illuminance only Disability glare calculation Cutting field of view based on Guth Direction vector of glare sources Tiny other changes
11 Known problems with 0.9x versions Only ONE problem -> View type handling/validity! What is an invalid view???? -> missing view information -> Images treated by tools (like pcompos) Then RADIANCE routines treat view as invalid -> standard view is used <> fish eye!! Missing feature: other viewtype than vta
12 Example Reality: Ev=6125 lux, DGP=0.52 e.g. use pcompos -s 1 testpic.pic 0 0 -> same image -> tab added to the view option string in header -> indicating invalid view
13 Example original image #?RADIANCE CAPDATE= 2003:12:15 17:44:01 /scratch/wienold/ecco/weissejal/results/ / pf.pic: VIEW= -vta -vv 182 -vh 182 -vp vd vu pcompos -x 786 -y 786 /scratch/wienold/ecco/weissejal/results/ / pf.pic FORMAT=32-bit_rle_rgbe changed image: #?RADIANCE CAPDATE= 2012:09:10 23:49:48 GMT= 2012:09:10 21:49:48 103_diagonal_morning_C_typing.pic: CAPDATE= 2003:12:15 17:44:01 /scratch/wienold/ecco/weissejal/results/ / pf.pic: VIEW= -vta -vv 182 -vh 182 -vp vd vu pcompos -x 786 -y 786 /scratch/wienold/ecco/weissejal/results/ / pf.pic pcompos -s 1 103_diagonal_morning_C_typing.pic 0 0 FORMAT=32-bit_rle_rgbe
14 Example Reality: Ev=6125 lux, DGP=0.52 e.g. use pcompos -s 1 testpic.pic 0 0 -> same image -> tab added to the view option string in header -> indicating invalid view Apply evalglare (e.g. v0.9f) Wrong result: Ev=780 lux, DGP =0.23!!!!!!!!!
15 Solution: Other handling of view type than before Implementing other viewtypes as well
16 Content Introduction Known problems with 0.9x versions New features of the 1.08 version View type handling Supported view types Low light correction Age correction Calculation of vertical illuminance only Disability glare calculation Cutting field of view based on Guth Direction vector of glare sources Tiny other changes
17 View type handling If invalid view, error message is displayed and program terminates: error: no valid view specified -> If such images should be used, the view options can be provided now per command line option: -vtt Set view type to t. (for fish-eye views, please use -vta or -vth preferably) -vf viewfile Get view parameters from viewfile. -vv val Set the view vertical size to val. -vh val Set the view horizontal size to val.
18 Supported view types All view types are supported now! except parallel view -vta preferred (just because long term experience) Caution! If view does not cover 180 Ev cannot be calculated correctly -> should be provided then by i option
19 Low light correction Problem: DGP is not defined for values smaller than 0.2 or Ev < 320 lux!! correction factor for low light scenes advantage: existing DGP equation is not changed, but usability range extended based on user assessments s-curve between lux Ev DGP _ lowlight = DGP e 1+ e 0.024* E V 0.024* E 4 V 4
20 Low light correction DGP _ lowlight = DGP e 1+ e 0.024* E V 0.024* E 4 V 4
21 Age influence User assessments with 3 age groups 15 test persons in age group test persons in age group test persons in age group parallel study in 9 office buildings à 15 offices each (done by University Karlsruhe) we found a (weak) improvement of the correlation between user perception and DGP when age is applied to equation This was confirmed by the office study (better improvement than in the lab study)
22 Age influence Following correction showed best correlation: DGP _ age = DGP age ( * ) 100 evalglare implementation: New option: -a age default: age=20, factor =1
23 Calculation of vertical illuminance only Disability glare calculation New Option : -V -> Calculates just the vertical illuminance from image Calculation of disability glare (according to Poynter, age =20 years) -> CIE disability glare equations will be included in future -> output generated by detailed output (-d), Disability Veilling Luminance Lveil
24 Cutting field of view based on Guth based on paper of Guth 1958: Light and Comfort, Industrial Medicine and Surgery, November 1958 activated by option -G type, type=1: total field of view, type=2: field of view seen by both eyes
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29 Direction vector of glare sources Original Problem: Determine the amount of min/day and h/year when glare occurs by reflections of a PV installation.
30 Direction vector of glare sources sun Reflection on PV α? Observer Specific Problem: What is the angle between sun and glare source? Reason: If angle <10 the brain perceives only one glare source, even two glare sources could be seen
31 Direction vector of glare sources Solution: evalglare provides direction vector for each glare source scalar product gives then the cos of the angle Using d option, in the glare source section you get the X, Y, and Z direction of each glare source 2 No pixels x-pos y-pos L_s Omega_s Posindx L_b L_t E_vert Edir Max_Lum Sigma xdir ydir zdir dgp,av_lum,e_v,lum_backg,e_v_dir,dgi,ugr,vcp,cgi,lum_sources,omega_sources,lveil:
32 Tiny other changes version number is given by v and written in the image header Piping of input pictures into evalglare possible. The threshold factor of absolute glare source detection (-b) is changed from 500 to 100. Peak extraction is default now (-y). For deactivation use -x.
33 Version 1.08 is available in the next days. Thanks for your attention!!
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