VX6953CB datasheet(73/107 Pages) STMICROELECTRONICS

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8209023 Rev 5

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VX6953CB

EDOF control

8.3.2

EDoF_est_focus_distance (0x0B82)

The edof_est_focus_distance register (0x0B82) is Read Only. This register tells the user the

estimated focus point that the EDoF function has calculated. Register values for a 5 Mpixel

EDoF camera are:

•

Macro mode: 0x1E

•

Portrait: 0x3F

•

Landscape: 0xFA

8.3.3

EDoF tuning sliders (0xB83 to 0x0B85)

The three key registers for the end user tuning are the sharpness, denoising and noise

versus detail registers.

Recommended settings

For the recommended settings of the EDoF sliders (0x0B83 to 0x0B85) refer to the relevant

personality file, see Section 7.2 on page 68.

Note:

Upon request, ST can provide the EDoF application note that gives details for HOST tuning.

8.3.4

EDoF focus distance (0x0B88)

For automatic mode, the value range is 0x8000 to 0xFFFF. Whatever value is selected

within this range will enable automatic distance estimation. ST recommends setting the

EDoF estimation mode to automatic mode. In this mode, when the user selects capture

mode, the EDoF processing will automatically use the last estimate of the focus distance

obtained in preview mode.

Note:

If it is necessary to switch between estimation mode and application mode while in software

standby, then a patch must be loaded to enable this feature. If the patch is not loaded,

switching must be performed whilst streaming. Otherwise the host must read the estimation

data (from register 0x0B82) immediately before going to software standby and rewrite that

data (to register 0x0B88) before restarting streaming in application mode.

For manual mode, the value to be set in the register is the value of the distance in cm. The

range is 0x0000 to 0x7FFF. If you want to go to one of the following modes, apply the

specified value for a 5 Mpixel EDoF camera:

•

Super Macro mode: 0 to 29cm

•

Macro mode: 30 to 59cm

•

Portrait: 60 to 249cm

•

Landscape: 250 to 32767cm

Supermacro mode only works in manual mode. Refer to Section 8.4: Supermacro mode for

more detailed information.

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