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A d j u s t m e n t of Video L e v e l
W
h
e
8 . 3 A d j u s t m e n t
o f i n c r e a s e d through the proper use of the GAIN and OFFSET controls.
Contrast
Enhancement
8.4 Adjustment o f
Shading
Corrector
(OPTION)
* * For -08 Camera Head
This imaging t u b e employs a intensifier w i t h adjustable voltage.
Increasing this voltage increases the sensitivity accordingly. The best
quality image is obtained w h e n the SENSITIVITY control is turned
to its minimum position. Increased voltage results in a poorer S/N,
therefore, the SENSITIVITY control should be increased only when
the imaging system cannot supply enough illumination or it is in-
tentionally desired to reduce object illumination. In this case, increase
the sensitivity until the upper range of the green LED is reached.
n
observing a specimen w i t h l o w contrast, image contrast can be
(1) W h i l e watching the monitor screen, turn the GAIN control k n o b
clockwise until the intensity appears slightly more than suitable.
(2) S l o w l y turn the OFFSET control knob counterclockwise until the
image is displayed as desired.
(3) R e p e a t adjustments o f both ( 1 ) and ( 2 ) until the desired part o f
the image is displayed most clearly.
Before enhancement A f t e r enhancement
When t h e M 2 5 0 2 SHADING CORRECTOR i s installed i n t h e CCU,
shading introduced by the camera and the optical system can be cor-
rected. This feature allows for the most effective utilization of the contrast
enhancement function.
Adjustment is as follows:
(1) A d j u s t CONTRAST ENHANCEMENT t o achieve maximum image
detail.
(2)
Set the SHADING switch to the ON position.
Correct the shading by adjusting the 4 potentiometers on the front
(3)
panel of the CCU with a small slotted screwdriver.
The functions of the potentiometers are as follows:
1. H o r i z o n t a l Parabola r ' )
Adjusting A d j u s t i n g horizontal parabola decreases the difference in the i n -
tensity between the center and the corners in the horizontal d i -
rection. Turning the adjusting screw clockwise results in the hori-
zontal center becoming brighter. Tu r n i n g t h e adjusting s c r e w
counterclockwise results in the corners becoming brighter.
2. H o r i z o n t a l Sawtooth
Adjusting horizontal sawtooth decreases the difference in the in-
tensity between the right and left sides of the image. Turning the
adjusting screw clockwise results in the left side of the image be-
coming brighter. Turning t h e adjusting screw counterclockwise
results in the right side of the image becoming brighter.
3. V e r t i c a l Parabola
Adjusting vertical parabola decreases the difference i n intensity
between the center and the corners in the vertical direction. Turning
the adjusting s c r e w clockwise results i n t h e center becoming
Offset Level
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