IZB n"72, 92322 Chatillon Cedex -France ADS T R ACTMapping techniques have emerged as reliahle measurement methods in a wide variety 0 1 fields. This is the case for temperature mapping aiicl flow field visualization. Another protiiising technique is pi-essure mapping based on pressure-sensitive paints.All these mapping methods provide images which ai-e very useful by thernselvcs because 2D o r 31) views allow improved knowledge about the studied behavior. The risefiilness of the image could further be enhanced by relating each imagc point to a point on tlic viewed object.A resection method is described. It allows data to he extracted from the iinagc and viitual images to be crcated. The method includes two parts. The first part covers recognition of' the camera location. The second part is the resection method itself. The hackprouric1 is clesci-ibetl and the software used is discussed. Finally three applications connected with teruperaturc mapping in wind tunnels illustrate the cap;ihility of tlie method.Mapping techniques are coirirnonly used in a wide variety of measurement applications. In aerodynamics they are irivolvccl in flow visualization and temperature measurement and arc becoming highly interesting for pressure nieasurement. Flow visualizations are commoiily made with laser systems providing a plane view. Thc images acquired can thereby hc related to the real 3D world without any major difficulty.Mapping temperature nicasiiremeiils are very usefui for heat rlux assessment in hypersonic ilows. 'These iiieasiii-etiic!its are inainly made by infrared thei-tiiography I 11\21. h i i t c;111 he made by phosphor thermography [31[4], liqliicl crystal thermography 151 and teinperature-sensitiv~ paints [61 [7]. The camera provides a picture fmrn a real 3D object. IJiifortunately the camera attitiidc arid location (hc,rcaftcrcalled CAL) are not well defined because of inaccurate CAL assecwicnt under wind tiiiine! conditions. The nroblcm arise.; 01 iinw ro process rhc irnnge 111 aim! !U i c i m ; I I I . :~ 1 x j t i i i to x i image point. l'ressure iiieasuremeiit with pressiirc-sensitive lurniiiescent paints (PSP) is a very promising mapping technique [8]/9].It is claimed that this technique can pr-wide an accut-acy of t11c same rnagnitude as with converitioiial equipincrrt. Tlierefore this niapping technique req~iircs ;in accurate riicthoti to estat,iisli the r-elatioiiship hetwcen the iinnge and the modci.The suhjcct of ohtaining information on the image and putting it on the real 3D model, called "resectim" i n this papcl-, has heen amply studied in computer vi:,ion and robotics. Brit only ;I few pt-actical applications have heen dcvclopctl for wind tunnel applic:itioiis [2]{9]. I t is assuitictl (hat (lie rcqiiit-et1 high accuracy, the pooi-illuniiilation quality and the iinfavorablc vicwiiig coiiclitioix ;ire significaii: rciisons foi-the 13ck o f i.csiil:\.[Iowevcr thc rniliii ireason is piohably due to tlie f x t that wiiicl tiiiiiiel nicasiirciiiciit teams :we not used io opcrnting iningin;: systcriis. ...
