MT9M034_17 datasheet(15/39 Pages) ONSEMI

Part #	MT9M034

Description	1/3-Inch CMOS Digital Image Sensor

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MT9M034

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Due to limitation on the internal floating point calculation,

the exact ratio specified by the RATIO_T2_T3

(R0x3082[5:4]) may not be achievable.

When using companded output in combination with

certain exposure ratios (other than T1 / T2 = 16x and T2 / T3

= 16x), digital gain needs to be set to a fixed value. Table

below provides the proper digital gain settings for each

T1 / T2 and T2 / T3 ratio.

Table 9. DIGITAL GAIN SETTING FOR EACH T1 / T2 AND T2 / T3 RATIO

T1 / T2 Ratio

T2 / T3 Ratio

Setting for Digital Gain Register

(0x305E Context A or 0x30C4 Context B)

4

0x02h

4

8

0x04h

4

16

0x08h

8

4

0x04h

8

0x08h

8

16

0x10h

16

4

0x08h

16

8

0x10h

16

Any Legal Value

Motion Compensation

In typical multi−exposure HDR systems, motion artifacts

can be created when objects move during the T1, T2 or T3

integration time. When this happens, edge artifacts can

potentially be visible and might look like a ghosting effect.

To correct this feature, the MT9M034 has special 2D

motion compensation circuitry that detects motion artifacts

and corrects the image accordingly.

There are two motion compensation options available.

One using the default HDR motion compensation by setting

R0x318C[14] = 1. Additional parameters are available to

control the extent of motion detection and correction as per

the requirements of the specific application. These can be set

in R0x318C–R0x3190. The other is using the DLO method

of HDR combination. When using DLO, R0x318C[14] is

ignored. DLO is enabled by setting R0x3190[13] = 1. Noise

filtering is enabled by setting R0x3190[14] = 1. For more

information, please refer to the MT9M034 Register

Reference document.

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