ADV7281 datasheet(21/32 Pages) AD

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Data Sheet

ADV7281

Rev. A | Page 21 of 32

ADAPTIVE CONTRAST ENHANCEMENT (ACE)

The ADV7281/ADV7281-M/ADV7281-MA can increase the

contrast of an image depending on the content of the picture,

allowing bright areas to be made brighter and dark areas to be

made darker. The optional ACE feature enables the contrast

within dark areas to be increased without significantly affecting

the bright areas. The ACE feature is particularly useful in

automotive applications, where it can be important to discern

objects in shaded areas.

The ACE function is disabled by default. To enable the ACE

function, execute the register writes shown in Table 18. To

disable the ACE function, execute the register writes shown

in Table 19.

Table 18. Register Writes to Enable the ACE Function

Description

User Sub Map (0x40 or 0x42)

0x0E

0x40

Enter User Sub Map 2

User Sub Map 2 (0x40 or 0x42)

0x80

Enable ACE

User Sub Map 2 (0x40 or 0x42)

0x0E

0x00

Reenter user sub map

Table 19. Register Writes to Disable the ACE Function

Description

User Sub Map (0x40 or 0x42)

0x0E

0x40

Enter User Sub Map 2

User Sub Map 2 (0x40 or 0x42)

0x80

0x00

Disable ACE

User Sub Map 2 (0x40 or 0x42)

0x0E

0x00

Reenter user sub map

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