M64283FP データシートの表示（PDF） - MITSUBISHI ELECTRIC

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M64283FP

Image Sensor (Artificial Retina Chip)

MITSUBISHI ELECTRIC  

Semiconductor Technical Data

MITSUBISHI

Mitsubishi Integrated Circuit <Linear IC>

M64283FP

Image Sensor (Artificial Retina Chip)

12.5.2. Automatic Black Level Calibration Register - AZ (1 bit)

As shown in Figure 6, the output voltage VOUT (amplitude) becomes minimum (maximum) in the dark

state: the incident light is 0lx (black level). On the other hand, the output voltage VOUT becomes the same

as Vref in the light state: the incident light is very strong and the pixels are saturated (saturation level). The

black level is calibrated so that the output amplitude is in proportion to the incident light intensity (the

output amplitude becomes large as the incident light increases). As shown in Figure 6, the output voltage

VOUT, in which black level has been calibrated by biasing the saturation voltage Vsat, becomes Vref in the

dark state, and its amplitude becomes maximum in the light state. Figure 7 shows a scheme of automatic

black level calibration. In this scheme, the difference voltage between the effective pixel and the dark pixel

is put out. By using this circuit, shift of the saturation voltage Vsat attributed to exposure time can be

calibrated automatically. The automatic black level calibration is enabled in any image capture mode and

works when the AZ register is "H" (an initial value of AZ: L).

128 × 128 pixel array

Dark pixel

column

IOB

IP

Horizontal control circuit

AZ

READ

-

-

+

+

Vout

IP- IOB

Vref

Parameter

AZ

0

1

Figure 7. Structure of Automatic Black Level calibration Circuit

Automatic black level control

Disable

Enable

14/35

Specifications and information in this document are subject to change without notice.

Ver. 2. 2. 3

07/22/1998

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