VD6640 datasheet(22/126 Pages) STMICROELECTRONICS

22 / 126 page

Functional description

VG6640, VD6640

22/126

DocID023597 Rev 11

3.1.5

Power management

The power management block provides the necessary supplies to the CAB and improves

the power supply rejection ratio (PSRR).

3.1.6

Multiple exposure HDR pixel

The high dynamic range (HDR) image data is constructed by combination of three

exposures (integration time) for each pixel. A long exposure captures details in the dark

parts of the scene, whilst a short exposure captures details in the bright parts. A mid-length

exposure captures all mid-range details.

Figure 6. Multiple exposure HDR pixel

During pixel data collection, the long exposure is made first and stored in SRAM. Then the

medium exposure is made Finally, the short exposure is made and once all the data is

collected, the three exposures are intelligently merged to create one high dynamic range

pixel value.

3.2

Digital video block

The HDR video pipe includes the following main functional blocks:

•

three sub-pipes, one for each pixel exposure, see Section 3.2.1

•

statistics gathering, see Section 3.2.2

•

pattern generator, see Section 3.2.3

•

HDR rescaling, see Section 3.2.4

•

piece-wise linear (PWL) compression, see Section 3.2.5

•

status line and trailer, see Section 3.2.6

•

defect correction supporting RAW Bayer and Monochrome color masks.

Lo n g 12b it

exp o su re

Sto re d

Med iu m 10b it

exposu re

Sto re d

Sh o rt 10b it

exp o su re

17bit

22bit

HD R Im age

HD R Me rg e

M2 L

and

Dig ita l Ga in

HD R Me rg e

S2 M L

and

Dig ita l Ga in

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