VX6953CB datasheet(71/107 Pages) STMICROELECTRONICS

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8209023 Rev 5

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VX6953CB

EDOF control

Like an auto-focus module:

•

The algorithm has failure cases, but the correction is constrained in order to always

have acceptable image quality even if not optimal.

•

For a single image several modes are often possible and giving same level of image

quality.

For overlap distances (between macro and portrait modes, or between portrait and

landscape modes), two of the channels may have the same level of sharpness, so any

of the two corresponding distances could be returned, depending on scene content and

field curvature of the module.

For scenes with objects at different distances, any of the three distances could be returned

depending on content of the scene, field curvature of the module and spatial weights used

for estimation (edof_estimation_control).

Supermacro mode is used for bar code and business card reading. Supermacro mode uses

a monochrome image. Below 30cm distance, the MTF is lost and there is too little Green

and Red pixel information to build a colored image. However, the blue pixel has enough

MTF to reconstruct a monochrome image.

8.2

Control Interface

VX6953 has a 100 kHz/400 kHz I2C compatible 2-wire control interface. It uses the SMIA

16-bit index, 8-bit data message format. The CCI interfaces allows the programming of the

EDoF control register.

8.3

EDOF control registers [0x0B80 to 0x0B8A]

Table 41. EDOF registers [0x0B80 to 0x0B8A]

Index

Byte

Data type Default Type

Comment

0x0B80

edof_mode

8UI

EDOF control

0 - EDOF disabled (power saving)

1 - EDOF application (Capture)

2 - EDOF estimation (Preview)

0x0B82

edof_est_focus_distance

8UI

RO The estimated focus point (cm)

0x0B83

edof_sharpness

8UI

EDOF sharpness control

0x7F: Manual mode

0x80 to 0xFF: Automatic mode

0x0B84

edof_denoising

8UI

RW EDOF denoising control

0x0B85

edof_module_specific

8UI

RW EDOF noise vs details control

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