Auto Shading Correction - Hitachi HV-C20 Operation Manual

Auto shading correction

Uneveness in colors may be observed in the vertical direction according to a lens. This camera
is provided with the function to correct such uneveness in colors automatically. Two correction
modes are available.
mode in the menu mode.
1. Establish the direct mode.
2. Set the lens iris appropriately.
3. Allow a white object to be displayed on the entire screen.
Use care that uneveness in colors cannot he observed in the vertical direction.
4. Press the ASC switch. Then, AUTO SHADING:OK is displayed, and uneveness in colors is corrected.
5. When auto shading correction is not made, the corresponding message is displayed.
Repeat the above procedure, if necessary.
(Note) When the ASC switch is pressed, a message can disappear in accordance with the brightness of a
white object in a scene. This is not due to failure. In this case, correction is being performed. Therefore,
do not move the camera, or do not change the lens iris until the message AUTO SHADING:OK or NG
is displayed. If wrong operation is made, correct shading correction data is not
obtained. If wrong operation is made, repeat the steps 1 thru 4 above.
Error message
AUTO SHADING:NG
CHANGE TO CAM
TRY AGAIN
AUTO SHADING:NG
LOW LIGHT
TRY AGAIN
AUTO SHADING:NG
C.TEMP HIGH
TRY AGAIN
AUTO SHADING:NG
C.TEMP LOW
TRY AGAIN
AUTO SHADING:NG
SHAD MODE: COLOR
CONTROL LIMIT
AUTO SHADING:NG
SHAD MODE: LUMIN
CONTROL LIMIT
Prior to execution
Mode
SHAD MODE:COLOR
SHAD MODE:LUMIN
Turn off the color bars.
Insufficient quantity of light
Increase illumination, open the lens iris, or increase gain to obtain an
appropriate video level.
Press the AWB switch again
Color temperature is too high.
(Continue to use if there is no practical problem.)
Lower the color temperature by adding a
warm color temperature correcting filter to the lens or the illumination.
Color temperature is too low.
(Continue to use if there is no practical problem.)
Increase the color temperature by adding a cold
color temperature correcting filter to the lens or the illumination.
The optimum correction could not be made because correction amount
is too large. Correction has been made as much
as possible. Continue to use if there is no practical problem
Replace with a lens providing less shading.
The optimum correction could not be made because correction amount
is too large. Correction has been made as much
as possible. Continue to use if there is no practical problem.
Replace with a lens providing less shading.
of correction, select
Application
Normal lens
Microscope
Measures
the desired correction