VX6953CB datasheet(87/107 Pages) STMICROELECTRONICS

87 / 107 page

8209023 Rev 5

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VX6953CB

NVM contents

The sensor has the following contents in the NVM:

•

revision and traceability data

•

green imbalance correction data

•

grid-iron correction data (option)

•

sensitivity data (to be used by the host)

•

defect data (used on-chip, described in Section 9.3 on page 84)

•

lens shading AV2x2 corrector data (used on-chip, described in Section 9.5 on page 86)

10.1

Green imbalance corrector

The NVM is programmed with calibration data for four different illuminants that are used by

the sensor to minimize green imbalance (used on-chip, see Section 9.4 on page 85).

10.2

Lens shading gridiron correction

This data is not used by the sensor but can be used with a host ISP based bi-cubic

corrector.

The lens shading gridiron data is calculated at FMT for each device for one color

temperature D65 (Fluorescent Phillips Graphica Pro 965). Each of the four color channel

values are recorded. Each grid ROI in each color channel with the pedestal removed. The

on board lens shading correction is disabled. The analog gain is set to x1.

10.3

Sensitivity data

This data is not used by the sensor but can be used by the host to calibrate the AWB

system.

The sensitivity data is measured at FMT for each device for one color temperature D65

(Fluorescent Phillips Graphica Pro 965). Each of the four color channel values are recorded.

The 10-bit average of the central 1% of the image (1% of image width, 1% of image height)

is recorded, the pedestal is included in the value. The on-board lens shading correction is

disabled. The analog gain is set to x1.

More details are provided in the calibration application note.

VX6953CB датащи(PDF) 87 Page - STMicroelectronics