VX6854LC datasheet(88/114 Pages) STMICROELECTRONICS

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EDoF control

VX6854LC

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DocID027110 Rev 2

need to be corrected when images are downscaled. No focus distance estimates are

performed in application mode, even in multi-shot mode.

For preview mode, set the 0x0b80 register in estimation mode

0x0b80 = 0x02; // EDOF enabled for estimation mode

For capture mode, set the 0x0b80 register in application mode

0x0b80 = 0x01; // EDOF enabled for application mode

Note:

Before enabling application mode, estimation mode has to be applied for a minimum of one

frame so as to estimate the EDoF focus distance. This information is used in application

mode when the image data is corrected. If estimation mode is not enabled prior to

application mode, no correction will be applied to the snapshot image.

10.3.2

EDoF_est_focus_distance (0x0B82)

The edof_est_focus_distance register (0x0B82) is READ ONLY. This register tells the user

the estimated focus point (cm) that the EDoF function has calculated.

10.3.3

EDoF tuning sliders (0xB83 to 0x0B85)

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

versus detail registers.

•

edof_sharpness (0x0B83)

Value ranges from 0 to 127. The higher the value the more sharpening is applied.

Higher values result in high contrasted edges being more sharpened but the noise level

in uniform areas will not suffer.

Figure 33. Example images with different settings for sharpness slider

Sharpness=0x00

Sharpness=0x60

Sharpness=0x40

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