OV7620 datasheet(40/60 Pages) ETC

40 / 60 page

OV7620 Product Specifications - Rev. 1.2 (5/13/00)

OMNIVISION TECHNOLOGIES INC.

Preliminary Company Confidential

AEB7-AEB0 - used to calculate the black pixel ratio. OV7620 AEC algorithm is count whole field/frame

white pixel (its luminance level is higher than a fixed level) and black pixel (its luminance level

is lower than a fixed level) number. When white/black pixel ratio is same as the ratio defined

by registers [25] and [26], image stable. This register is used to define black pixel ratio, default

is 75%, each LSB represent step: Interlaced: 1.3%; Progressive Scan: 0.7%. Change range is:

Interlaced: [01] ~ [4A]; Progressive Scan: [01] ~ [96]. Increase AEB<7:0> will increase black

pixel ratio. For same light condition, the image brightness will decrease if AEB<7:0> increase.

Note: AEB<7:0> must combined with register [25] AEW<7:0>. Keep the relation always true: AEW<7:0> +

AEB<7:0> > [4D] for Interlaced; AEW<7:0> + AEB<7:0> > [90].

COMF7 - COMF6: Digital Sharpness threshold selection.

[00] - Difference of neighbor pixel luminance is larger than 8 mV, correction on.

[01] - 16 mV.

[10] - 32 mV.

[11] - 64 mV.

COMF5 - COMF4: Digital Sharpness Magnitude selection.

[01] - Strength is 50% of difference of neighbor pixel luminance.

[10] - 100%.

[11] - 200%.

COMF3 - Reserved

COMF2 - Swap bus MSB/LSB. “1” LSB->Bit7, MSB->Bit0; “0” normal.

COMF1 - “1” A/D Black level calibration enable. Do not use “0”.

COMF0 - “1” Output first 4 line black level for Interlaced Mode and 8 line black level for Progressive Scan

Mode before valid data output. HREF number will increase 4/8 relatively. “0” no black level

output.

Bits

AEB7

AEB6

AEB5

AEB4

AEB3

AEB2

AEB1

AEB0

Interlace

Progressive Scan

Bits

COMF7

COMF6

COMF5

COMF4

COMF3

COMF2

COMF1

COMF0

Default

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