A
PPENDIX
A. G
LOSSARY
P
AGE
21
4
4
4
Exposure Methods
PL-A630 to PL-A660 Series cameras can operate i
dev
PL-A
Mode and Still
Mode. Earlier cameras use a rolling
“Video Mode” and “Still Mode” refer to imager exposure methods. While all of the
n either mode, only cameras equipped
with Enhanced Control headers can be connected to external flash and shutter control
ices (preferable for Still Mode).
650 and PL-A660 Series cameras use a rolling shutter in both Video
shutter in Video Mode and simultaneous exposure in
Still Mode.
4.1
Video Mode Exposure
In video mode, exposure of the image sensor is controlled by a virtual window that
moves from the top to the bottom of the subwindow and then rolls up to the top of the
window for the next image frame. This virtual window is the same width as the
window and has a height proportional to the exposure time. This is similar to a
ling shutter
in conventional photography.
sub
sub
rol
Row
oves. The virtual
window moves one row
on its trailing
edge is a
nexposed row is added to its leading
edge.
e
rolls to
w to start exposing rows for the next frame. Thus, at any
given ti
particular row depends the amount of time since it
was
As
ge frame is built from top to bottom.
con
con
o capture and interactive image control.
s are removed from and added to the virtual window as it m
at a time, when the fully exposed row of pixels
tr nsferred to the image frame and an u
Wh n the leading edge reaches the bottom of the subwindow, the virtual window
the top of the subwindo
me, the level of exposure of a
added to the virtual window.
each trailing edge row is transferred, an ima
Since all rows in a finished frame are exposed equally and rows are transferred
tinually, this strategy is appropriate for still image capture in ambient lighting
ditions, vide
4.2
Still Mode Exposure
Note:
External flash and shutter control devices can be connected to cameras
with Enhanced Control headers only (PL-A633, PL-A634, PL-A653,
L-A654).
P
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PL-A630 to PL-A660 Series Cameras
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