Fotogrammetrian erikoissovellutukset, luento 12

(Henrik Haggrén, 19.1.2001)

Luento 12: 'On-line' sovellukset

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Henrik Haggrén, 1994. Video Image Based Photogrammetry and Applications. Videometrics III, Sabry F. El-Hakim, Editor, Proc. SPIE 2350, p. 22-30, Boston, USA (1994).

Scale bar used for calibration reference.

External check for 3-D measuring accuracy.

Image observations for calibration.

Retro targets used as external stability control.

Valmet Automotive Inc., Uusikaupunki
ensimmäinen mittausasema, tuotantokäytössä vuodesta 1992
korin tunnistus, ovien tarkistus, mittaus, koordinaatistonmuunnosten laskenta, tiedonsiirto roboteille
XYZ paikoitustarkkuus ± 0.2 mm 1.5 - 2 m:n matkalla
kokonaissuoritusaika <15 sekuntia
MTBF 14 400 h, MTTR 2 h

At Valmet Automotive Inc. (Finland) two robotic seam sealing stations have worked since August, 1992. The unique feature of the stations is true 3-D machine vision equipment provided by Mapvision Ltd. The machine vision part is able to locate a car body with 0.2 mm precision in XYZ directions. Moreover, Mapvision systems identify the car body model in order to make the correct robot program run.
After the four year period the marvellous results of the sealing station projects are obvious. Pay-back time of the total investment (about $1.6 million) was found to be 1.67 years. Machine vision makes the stations very flexible. This far the stations have been utilized in production of 17 different Opel and Saab car body variations. All this has been carried out without mechanical assembly work.
Self-monitoring features makes measuring very reliable. Measuring results are always accurate and car body identification errors do not exist. Automatic recalibration procedure has been able to maintain the same coordinate system orientation through the whole period.
The Mapvision system hardware has caused five short production stops due to DC power supply failure (three times), hard disk error and an AC power switch breakdown.
Paavo Pitkänen, the leader of the robotic seam sealing project, says: "We are extremely satisfied with the machine vision system. It is really flexible and does not need maintenance. But the best feature is of course the reliability."

Wind screen shape measurement.

GlassVision, Tamglass.

Pallotankin valmistuksen avainteknologiat ovat hitsaus-, muokkaus- ja mittaustekniikoissa. (Teknikan Näköalat, 3/1997)

Juhani Anttila, Henrik Haggrén, 1997. Video camera measurement system approaches theodolite accuracy.
Robot Vision TEKES Machine Vision 1992-1996. Final Report of the National Research Programme.