1978 ISP COMMISSION V INTER-CONGRESS SYMPOSIUM - STOCKHOLM SWEDEN 
—— vum wmm ww Wu que wem "wes M qem e wee xp AR EA umb MAT dun quA ch m MM Mm m. n o n he MM wap Anm o !A—— e c 
iue uem! amem eem mm eum mm weh emm e m m pim uum ee en Wem mum um qb ch du A mm Se qa ds WAS wn sum mm € A m s en 
Gates: 
I suggest that we should consider, at this stage, whether a widen- 
ing of the interests of the Working Group may be required to include other 
"non-conventional imaging techniques". On the other hand, there may be a 
feeling that attention should be concentrated in a particular area, leaving 
the other areas for future attention. 
Before this, we should perhaps try to clarify the distinction implied in 
the term "non-conventional imaging". 
I must confess that I am in some 
doubt, but have always assumed that "conventional imaging" would be the 
process found in classical photogrammetry. This still leaves me with a 
personal difficulty, as I cannot claim to have been trained as a photogram- 
metrist, but I have tried to sort out some of the distinctions between 
"conventional" and "non-conventional" so that we may perhaps be helped to 
pick out the areas for study by the Working Group. 
Conventional Imaging 
  
One-to-one object/image 
relation. Conjugate points. 
Illumination in visible 
wavelengths. 
Recording by photography. 
Records in form of two- 
dimensional distribution of 
intensity modulation. 
Object usually a surface 
distribution or a central 
projection of a 3D array. 
Terrestrial (dry land surface) 
Deformation measurements often 
over a long time. 
(i.e. change of form) 
Usually effectively a static 
object. 
Accuracy predetermined by the 
optical system provided. 
Departures from Conventional Imaging 
(unconventional) 
  
Non image forming: Moiré, speckle, 
Surfaces involved in a transform relation. 
X-ray, y-ray, infrared, microwaves, 
neutron beams, electron beams, lasers. 
Video, Xerography, Holography, 
Electronic Scanning, intensifier tubes, 
Solid state scanners and picture 
dissection. 
Phase recording techniques. 
Real time processing. 
Records in holograms, computer stores, 
electro-optical or magnetic or other 
memeories. 
More comprehensive range of objects. 
Inclusions in solids, fluids. 
Underwater, underground, microscopic. 
Continuous or periodic change of form, 
eg. vibrations, high frequency measurement. 
As above, sequential recordings or a 
time distribution. Real-time, on-line, 
interactive measuring system, 
Wider scope for application of all kinds 
of physical measurement processes, limited 
only by the physical processes, 
eg. diffraction.