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Research into Visual Perception conducted by Roetling et.al.
Roetling et.al. also investigated human visual perception using simple
two-dimensional shapes. They considered human detection and recognition
of images while investigating theoretical
prediction
of the quality
of photographic images.
As part of their work they considered the problem of
human observers deciding whether a given image of an object is a square
or a circle. The approach
described involved the analysis of images in terms of spatial frequencies
(which is a technique for describing images mathematically). To predict
the human recognition of two-dimensional objects generally, using the
square/circle
example,
the ‘spectrum
of the difference of the two possible object patterns’ was evaluated
numerically. A contour plot of this function was included, where the
frequency units had been normalized so that the unit of frequency
is the reciprocal
of the length of the side of the square.
The importance of using a square and circle of the same area and contrast
was stressed, and it was stated that if the objects had not been chosen
according to these conditions then the decision would be most heavily
weighted near the low frequencies and would be dependent more on contrast
or size, than on shape.
For further information about this work see their paper:
P.G.Roetling, E.A.Trabka & R.E.Kinzly, "Theoretical Prediction
of Image Quality", J.O.S.A., Vol.58, No.3, pp.342-346 (1968).
This Section consists of short summaries of historial research and theories
into human visual perception of simple two-dimensional objects (these
are extracted and summarised from a Ph.D. Thesis
[67] dated 1996).
For more general information about the human visual system see
the sections about:
The
Eye; Parts
of Eye; Visual
Disorders;
Ophthalmological
Procedures.
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This entry relates to studies of human visual perception conducted
and published during the 1960s.
This
Section is about
Theories
of Visual Perception.
To read about other theories and contributions of other researchers,
use the links on the left-hand side.
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