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VX6953CB Datasheet(PDF) 74 Page - STMicroelectronics

Part # VX6953CB
Description  5.1 megapixel EDOF camera module
PDF  107 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VX6953CB Datasheet(HTML) 74 Page - 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
register 0x0B88, the EDoF correction will not be accurate.
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
32
2
2
2
2
2 22
1 1 1 1 1
1
1
1
1
1
1
1
1
1
1
1
1
0 0 00 0
0 0 0 0 0
0 0
0 0
0 0 0 0 0
00 00 0
1
0 0 00 0
0
0
0
0
0
0
00 00 0
1 1 1
1
1
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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