measure
MTF, lateral chromatic aberration, distortion,
tonal response, and color accuracy.This SFRplus
test chart can be used with the SFRplus module.
This
chart, and all our ink jet printed charts have an approximate MTF50 of
5 cycles/mm. Please keep this in mind when choosing the size
of chart. Using a chart that is too small with a
high-resolution sensor can result in the MTF of the chart degrading the
measured MTF of the camera system. In addition, it is important to use
a chart that is large enough to accomodate the minimum focus distance,
as well as the resultion of your sensor.
Charts
are available in tfive main sizes with variations depending on the grid
dimensions selected. It is recommended that the medium sized charts be
used to test imaging systems with sensors up to 12 MP, the large charts
be used for testing of sensors above 12 MP and up to approximately 24
MP, and the extra-large charts be used for sensor sizes above 24 MP.
The
active area of the chart includes white space above and below the top
and bottom distortion bars. It is slightly larger than the printed
area, which is bounded by the distortion bars on top and bottom. White
space is included in active area because test images of the chart must
include this white space in order to enable automated processing in
SFRplus software.
Inclusion
of the color chart enables testing of color accuracy. If the color
option is selected, the "focus star" pattern that aides in focusing is
replaced by a 20 patch color chart.
Pre-distorted
charts offer the ability to map the outer edges of a wide angle or
fisheye lens using SFRplus. These distortion levels are available