VG6640 datasheet(23/126 Pages) STMICROELECTRONICS

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VG6640, VD6640

Functional description

125

Figure 7. HDR video pipe

3.2.1

Three sub-pipes for each pixel

Each sub-pipe contains the following blocks, operating on each exposure of the image:

•

Dark calibration

An algorithm that estimates the dark current for each pixel and each pixel exposure.

The estimated dark current value is then subtracted from each pixel exposure value in

order to accurately render the image.

•

Exposure alignment

Line memories that store the intermediate long and medium exposure time values until

the short integration time value of the same pixel is available.

•

Defect correction

An algorithm to correct defective pixels. This can be configured to manage RAW Bayer

or monochrome color masks. Single or couplet defective pixels may be removed

dynamically. Couplet defective pixels may be mapped out and removed using data

from the non-volatile memory (NVM). Up to 32 pixels may be mapped out.

•

Digital gain

In combination with the analog gain, a higher system gain can be achieved. The digital

gain can also be used to compensate for the coarse step size of the analog gain, as the

digital gain has a much finer step size. This allows further white balance and exposure

corrections to be made by the companion device.

HDR video pipe

3 x Sub-pipes

(1 for each exposure)

Exposure

alignment

Defect

correction

Dark

calibration

Digital

gain

Pattern

generator

Statistics

gathering

HDR

rescaling

PWL

compress

Status

line

MIPI

and

parallel

I/O

CAB

CSI-2

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