CONST) AN' 9
= CS ut
It is advocated that whatever information is provided on a
calibration certificate the basic measures of x and © should always be
included.
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The fundamental constants of a camera may be expressed by listing
the external angles of entry 9 against the measures on the plate to
which they apply. This is the basis of all camera calibration. Why
is it then that these measures are not listed on the calibration
certificate?
practice is to state on the calibration certificate a
value for the principal distance against a list of distortions corres-
ponding to various angular distances from a point of origin. Thase
are not basic measures at all. They are obtained from the original
measures by a mathematical process invo lying various adjustments,
distributions, interpolations and w Tt
The usual
; It is well known that
these distortions may be expressed in a Le variety of different
Ways. Furthermore, the distortions are often given in the form of a
graph in which the number of observations made and the degree of inter-
Na
^1643 rs 1 Ares A + Br st wre xx Ya rs ry ram
pol tion employed is effe tively niaaen.
The writer believes that the analysis of the basic measures should
be undertaken by the photogrammetrist using a method which suits best
] Wr there is no need for the analysis of these
m the calibrating authority. If this
principle was adopted it would altogether absolve the calibrating
1e 1 ining his computing techniques.
28 t ot do this in sufficient detail it
is impossible for the photogramme trist to work back from the data
ied | ym3 Apr +7 - rt an! "haenuvat3j a Thoae At
supplied to determine correctly the original observations. These it
. : 7 CR . ER nn 4 M mt chee t^» determine ^W
is essential for him to know if he wishes to determine his own
the task he has in mind.
1 , 3 J- 4 f^ «T > + - + nd X 3f fe c
lhe writer therefor idvocates that whatever information 1s
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x : 123 s Ls A a 1 . t ^
Y ^ (^ 1f à (À + ’ Y 4! A+" ^ ^ „+4 { mr ; 4 y - : ~ at v e r1
proviaea on calibration certificate, the Dasio measures oi x and v
annie
