Panasonic MICRO-IMAGECHECKER A100 Series, Руководство по оборудованию

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About Camera Modes A200/A100 Hardware
5 − 5
5.3 Frame Mode and Field Mode
5.3 Frame Mode and Field Mode
Frame Mode
In this mode, the camera captures an even number array and an odd number array and
sends them to the image processing system. In the A Series, all 512 × 480 pixels are
sent to memory and are then subject to image processing. Compared to field mode this
requires more imaging time, but the resolution is higher.
Field Mode
In this mode, the camera captures either an even number array or an odd number array
and sends it to the image processing system. In the A Series, 512
×
240 pixels are
captured, but are transferred to memory as 512 × 480 pixels and then image
processed. Image capture is faster than in frame mode, but resolution is lower.
Frame capture
memory image
Original image
Field capture
intermediate image
Field capture
memory image
In the frame mode, the original
image is captured into 256 lev-
el (8 bit) gray scale memory at
a resolution of 512
×
480 pix-
els.
In the field mode:
1. Every other line (vertical) of the original camera
image is captured into 256 level (8 bit) gray scale
memory at a resolution of 512
×
240 pixels.
2. The uncaptured lines are added during display
and image processing and the image is
captured into a 256 level (8 bit) gray scale
memory as a memory image, at a resolution of
512
×
480 pixels.
Using Frame and Field Modes Correctly
− Use memory image display for image display. Through Image Display takes an
excessively long time to complete image capture. In addition, there is a large amount
of dispersion in the image capture timing (max.: 33ms) for Double − speed Random
modes.
− When connecting only one camera to the A200, connect it to Camera jack A.
− When connecting two cameras to the A200, they must be the same camera type, use
the same mode, and have the same shutter speed.
− Be sure to turn OFF the power when connecting a camera to the controller.
− When using strobe light set the camera to normal field mode and be sure to switch
the monitor display to Memory Display. The strobe will flash continuously if the
monitor display is set to Through Display.
− During field mode or when using a random camera the sensitivity decreases in
proportion to increases in shutter speed. Smears may increase. When Through
images are displayed the monitor display will have fluctuating brightness. (This is not
an indication of a problem. The brightness will be stable in the memory images.)
− Be sure to use illumination that is designed for image processing.