Sony XCD-SX90CR Podręcznik techniczny - Strona 8

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Functions

Gain

Both Manual and Auto Gain settings are available with

this camera.

The variable range extends from 0 to 24 dB for the black

and white models or from 0 to 18 dB for the color

models. The camera is designed so that the gain can be

subdivided and set by 0.0359 dB.

At the factory default setting, the gain is set to 0 dB.

When Auto Gain is selected, the gain is adjusted

automatically, based on the brightness of the subject. At

this time, the reference level (target point) is set in the

AutoExposure register.

For details on AutoExposure, see "Auto Exposure" on

page 9.

Shutter

This camera allows both Manual and Auto Shutter

settings.

The variable range extends from 10 microseconds to

16.0 seconds; relative values are indicated by a 12-bit

integer, and absolute values are indicated using a 32-bit

floating point value.

The relationship between the parameter and the

exposure time is given by the following formulas,

where:

P = Parameter (003h to 47Eh)

E = Exposure time (s)

If P= 3

E = 0.00001

If 4 <= P <= 1000

If 1000 <= P <= 1150

Setting examples

3 (003h) : 10 µs (1/100000)

32 (020h) : 1 ms (1/1000)

100 (064h) : 10 ms (1/100)

1000 (3E8h) : 1 s

1010 (3F2h) : 2 s

1150 (47Eh) : 16 s

16 s

1 s

10 µs

When Auto Shutter is selected, the exposure time is

adjusted automatically, based on the brightness of the

subject. At this time, the reference level (target point) is

set in the AutoExposure register.

For details on AutoExposure, see "Auto Exposure" on

page 9.

For long exposure times

When the exposure time is longer than the frame period,

the camera enters the long exposure time mode, and the

actual frame rate is reduced in accordance with the

exposure time.

Absolute Value Control

for the Shutter

This camera allows control of exposure time using

absolute values. The values are indicated using a 32-bit

floating point value. (Unit: sec.)

The variable range of absolute values extends from 10

microseconds to 16.0 seconds.

Programming example

union

{

DWORD dwValue; // 1394 is expressed in quadlets,

float fValue; // exposure time is indicated in seconds.

} AbsoluteShutterValue;

AbsoluteShutterValue.fValue = Exposure time;

WriteQuad(AbsoluteShutterOffsetAddress,

AbsoluteShutterValue.dwValue);

WriteQuad is a virtual function used to write in the 1394

AbsoluteShutterOffsetAddress is an offset address for

the absolute value control.

See "ConfigurationROM" on page 17 for the formula

for the offset address.

1000

1150