LR38269 データシートの表示（PDF） - Sharp Electronics

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LR38269

Digital Signal Processor for Color CCD Cameras

Sharp Electronics 

q Weighted data 3

I (or Q) data comes from the following equation

using the weighting data from address 40h to

address 43h.

{(I11 + I12 π + I14) ÷ 4 x address 40h

+ (I21 + I22 π + I24) ÷ 4 x address 41h

:

+ (I41 + I42 π + I44) ÷ 4 x address 43h} ÷ 256

= Weighted data 3

The sum from the data of address 40h to the data

of address 43h shall be 256.

w Weighted data 4

Weighting area can be selected by address 45h.

(see "NOTES" in Gamma Characteristic Option.)

Weighted data comes from averaged data in

selected area.

e White balance area setting

The sum of I and Q can be regulated by the

luminance level and the color level.

Setting target zone : address 47h to address 4Ah

White balance data less than the data of address

51h and address 52h changes the target zone of

auto white balance to the zone by the data from

address 4Bh to 4Eh.

Above regulation comes from the following equation

along the luminance level.

Setting available luminance level range :

Highest luminance level limiter =

address 3Bh + [{address 3Eh x H peak level +

(256 – address 3Eh) x exposure control data} ÷

256 – address 3Dh] x address 3Fh

Lowest luminance level limiter =

address 3Ch + [{address 3Eh x H peak level +

(256 – address 3Eh) x exposure control data} ÷

256 – address 3Dh] x address 3Fh

LR38269

Auto Color Matrix Compensation

Color matrix compensation can be done by

R – Y = R – Y ± (Data 1 x B – Y)

B – Y = B – Y ± (Data 2 x R – Y)

Above data comes from below equation along the

variation of color temperature.

Data 2 =

address 55h + {(working R white balance data –

address 25h + (address 26h – working B white

balance data)} ÷ 32 x address 53h ÷ 8

Data 2 =

address 56h + {(working R white balance data –

address 25h) + (address 26h – working B white

balance data)} ÷ 32 x address 54h ÷ 8

Auto Color Level Compensation

Color level can be auto-controlled by the following

equation along the variation of color temperature.

B – Y level =

address 30h + {(working R white balance data –

address 25h) x address 22h + (address 26h –

working B white balance data) x address 23h} ÷ 32

x address 2Eh ÷ 8

R – Y level =

address 31h + {(working R white balance data –

address 25h) x address 22h + (address 26h –

working B white balance data) x address 23h} ÷ 32

x address 2Fh ÷ 8

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