ANNOUNCING THE FIRST MEETING OF
THE MORPHONOME INTEREST GROUP
Date: Thursday April 25th
Time: 1:00-5:00 pm
Convention Center, Room 301
Come and visit to see the new features of the Morphonome
software and find out whether they are relevant for your
psychophysics application. Bring us your suggestions for
improvements and additional needs.
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Features of the Morphonome Image Psychophysics Software.
> The Morphonome software package for image psychophysics
allows generation and presentation of a wide spectrum of 2-D
modulation images for psychophysical testing of the limits of
human perception with the Macintosh II and PowerMac
families of computers. Ease of use for the clinical investigations
into visual sensitivity losses.
> Output contrast can be varied in increments of as little as
0.2%. An invariant base contrast can be set to any level.
Patterns may be balanced or unidirectionally biased from the
mean luminance. Contrast and its modulation are controlled by
a look-up table animation, which may be split into two or four
separate functions (with a corresponding loss in the number of
available luminance levels for each independent image).
> A prototype version of the software is now available with the
ability to present stimuli with the attributes of motion, color
and visual noise. Either test or mask stimuli may be in these
forms, which may be modulated by any of the spatial window
functions available for static stimuli. For a Gaussian envelope,
this procedure generates the Rstationary moving Gabor patchS
in widespread use for studies of motion perception.
> Chromatic stimuli on axes such as red-green and yellow-blue
are selectable, with adjustment to equiluminance for the human
observer. Full control of stimulus chromaticity will, however,
not be available.
> Stimulus modulations of one- and two-dimensional pixel
noise, in the form of either static (changing from trial-to-trial)
or modulatable dynamic noise are available for use as a
masking stimulus or as a test stimulus.
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Calibration with the Smith-Kettlewell Macintosh Lightmouse.
> We have developed a Macintosh (LightMouse) calibrator with
Rplug-and-playS operation. A photocell with a CIE photopic
filter sends a digital signal through the ADB (keyboard and
mouse) bus to allow calibration of the luminances all look-up
table levels for each color gun for any of Macintosh II and
PowerMac family of computers.
>Operation of the LightMouse will be demonstrated at the
Intereset Group Meeting.
Conflict-of-Interest Statement.
The Morphonome and LightMouse packages are distributed at
cost on a non-profit basis through the Smith-Kettlewell Eye
Research Institute for the benefit of the vision community.
Christopher W. Tyler, Ph.D.
Associate Director
Smith-Kettlewell Eye Research Institute
2232 Webster Street, San Francisco, CA 94115 USA
Ph: 415-561-1640 Fax: 415-561-1610
Email: cwt@skivs.ski.org Home Page: http://www.ski.org/cwt.html