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Mira130

Sensor Operation

Datasheet

• PUBLIC

DS000715

• v6-00 • 2023-Aug-09

│ 36

Figure 43:

HDR Mode Control Registers

Function

Address

Default Value

Description

HDR mode enable

16’h3220

’h83

Bit[6]: HDR mode

1: Enable

0: Disable

Total exposure time

{16’h3e00[3:0],

16’h3e01,

16’h3e02}

20’h00200

In the unit of 1/16 line

HDR exposure time

{16’h3e31,

16’h3e32}

6’h0020

In the unit of 1/16 line

HDRC exposure ratio

setting

6’h5400

’h00

Total exposure time -{16'h3e01,

16'h3e02}; the value of second

exposure time {16'h3e31,16'h3e32},

value of 16'h5400=255*（1

– second

exposure time/total exposure time）

9.4

AEC & AGC

The AEC/AGC adjustment is based on the image

’s brightness. AEC adjusts the exposure time while

AGC adjusts the gain value so that the image

’s brightness can fall within a range bounded by pre-set

brightness thresholds.

9.4.1

AEC & AGC Control Strategy

This chip does not have the AEC function, so a back-end platform is needed in order to achieve

AEC/AGC.

During the AEC/AGC adjustment process, the exposure time and gain are interrelated and should be

considered as a whole. A recommended adjustment strategy is as follows: maximize the exposure

time first, and then apply gain if the exposure time has reached its maximum.

Consider a dark scene, the sequence of adjustment is: 1) increase the exposure time with no gain until

the exposure time reaches its maximum; 2) when the exposure time reaches its maximum but the

image is still too dark, adjust the gain. It should be noted that when the gain is increased, the average

image noise also increases. However, when the exposure time increases, the signal-to-noise ratio will

improve.

On the other hand, when the image is too bright, the gain should be reduced first. If all gains are

reduced to their minimum but the image is still too bright, then the exposure time should be reduced.

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