VX6953CB datasheet(74/107 Pages) STMICROELECTRONICS

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EDOF control

VX6953CB

74/107

8209023 Rev 5

8.3.5

EDoF estimation control (0x0B8A)

This register selects the region of interest (ROI) on which to apply the distance estimation

processing. Four different ROIs are available:

•

0 or 1: uniform

•

2: center-weighted

•

4: spot (large)

•

8: spot (narrow)

Considering the above order, with increasing values, the estimation will increase focus on

objects in the centre of the image.

Figure 31. Focus strategy weightings

8.4

Supermacro mode

Unlike the other modes (macro, portrait and landscape), supermacro mode cannot be

managed by the automated distance range estimator. The reason is that at distances below

30cm, there is very little information in green and red channels though there is a significant

energy in the blue channel. The distance estimator needs the four color channel information

to estimate the distance. Below 30cm, unless the distance is manually programmed using

For text or bar code reading, a monochromatic image can be used. EDoF supermacro mode

can be used for that purpose as the EDoF reconstruction engine would use the blue channel

information to calculate the suitable sharpness and denoising.

To enable supermacro mode, the user has to manually program the register 0x0B88 to set a

value for distances below 30cm. The register value being the value of the distance in cm.

Narrow spot

Large spot

Center

2 22

1 1 1 1 1

0 0 00 0

0 0 0 0 0

0 0

0 0 0 0 0

00 00 0

0 0 00 0

00 00 0

1 1 1

Uniform

1 1 1 1 1

11 11 1

11 1 11

11 1 1 1

11 1 11

The image is arranged as 5x5 regions for the weightings.

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