4. Shooting a computer monitor screen (cont’d) White spot compensation
One of the inherent, general characteristics of CCDs is that white spots may appear in the image at slow shutter speeds or during shooting at high temperatures. To moderate this phenomenon, this camera is provided with a white spot compensation function. 
In the digital output mode, white spot adjustment should be performed using the special appli- cation software
How to use
White spot detection
Because the number of spots and their size differ with the temperature and shutter speed, etc., it is necessary to | |
detect the positions of the white spots under the conditions of use before the white spot compensation is used. | |
1. | Make the settings under the conditions at which the unit |
| is to be used (ambient temperature and shutter speed, |
| etc.). |
2. | Prevent light from entering the CCD by closing the lens |
| iris, etc. |
MEMO
•The camera’s white spot compensation function cannot compensate completely for all white spots. White spot detection and compensation by this camera must be performed under the following con- ditions. White spot compensation is not possible under other con-
ditions. Even when these conditions are met, the properties of the white spots may prevent compensation.
No. of detections and compensations:Within a total of 10 spots.
• | The screen shown on the right may appear if light enters the CCD | ||
| while white spot detection is being performed, or due to the con- |
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| ditions of the white spots. In this case, confirm that light is not | ||
| entering the CCD. If light is not entering the CCD but the screen | ||
| nevertheless remain displayed, accelerate the shutter one step | ||
| and perform the detection again. | ||
• | When white spot compensation is carried out, the compensation | ||
| of the pixel data is performed based on surrounding pixel data, | ||
| which means that accurate data may not be obtained in case of | ||
| an image with fine details. | ||
• | The result of the white spot detection is retained until the next white spot detection is performed. | ||
Inside window |
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| [UP] |
| UP/AW |
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[MENU] | SET | [SET] |
MENU | [DOWN] | |
| DOWN | |
1 2 | 3 4 |
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PROCESS (2/2) screen
3.
4.
5.
6.
Open the side switch panel, and press the [MENU] but- ton for 2 seconds or longer. The [MENU] screen ap- pears on the monitor screen.
Press the [UP] or [DOWN] button to select [PIXEL CHECK] on the [PROCESS(2/2)] screen, and then press the [SET] button to display the [PIXEL CHECK] screen.
When the [SET] button is pressed, detection of the po- sitions of white spots starts. The detection may take several minutes.
When the detection is completed, “PIXEL CHECK OK” is displayed for about 3 seconds before the [MENU] screen returns.
PIXEL CHECK screen | Screen during detection | Screen when detection is completed |
E28 | E29 |