LR38269 查看數據表（PDF） - Sharp Electronics

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LR38269

Digital Signal Processor for Color CCD Cameras

Sharp Electronics 

Electronic exposure control data comes from below

equation using averaged luminance levels of 64

areas in one image, made by DSP.

Electronic exposure control data =

[{Weighted data 1 q x (64 – address 10h)

+ weighted data 2 w x address 10h} ÷ 64

x (256 – address 14h – address 15h)

+ top level e x address 14h

+ bottom level r x address 15h] ÷ 256

Y11 Y12 Y13 Y14 Y15 Y16 Y17 Y18

Y21 Y22 Y23 Y24 Y25 Y26 Y27 Y28

Y31 Y32 Y33 Y34 Y35 Y36 Y37 Y38

Y41 Y42 Y43 Y44 Y45 Y46 Y47 Y48

Y51 Y52 Y53 Y54 Y55 Y56 Y57 Y58

Y61 Y62 Y63 Y64 Y65 Y66 Y67 Y68

Y71 Y72 Y73 Y74 Y75 Y76 Y77 Y78

Y81 Y82 Y83 Y84 Y85 Y86 Y87 Y88

q Weighted data 1

This comes from the following equation weighting in

horizontal.

Weighting factors are the data from address 08h to

address 0Fh.

{(Y11 + Y12 π + Y18) ÷ 8 x address 08h

+ (Y21 + Y22 π + Y28) ÷ 8 x address 09h

:

+ (Y81 + Y82 π + Y88) ÷ 8 x address 0Fh} ÷ 256

= Weighted data 1

The sum from address 08h to address 0Fh shall be

256.

w Weighted data 2

Weighting area can be set by the data of address

11h and address 12h. (see "NOTES" in Gamma

Characteristic Option)

This comes from the following equation weighting in

selected areas.

(Y33 + Y34 π + Y66)/number of areas to be selected

= Weighted data 2

LR38269

e Top level : The highest luminance data in one

image by averaging either 4 pixels

or 8 pixels in horizontal.

r Bottom level : The lowest luminance data in

one image by averaging either 4

pixels or 8 pixels in horizontal.

Auto White Balance Control

White balance control data less than the data of

address 51h and address 52h stops AWB.

White balance control data less than the data of

address 4Fh and address 50h makes AWB active

so that white balance control data is less than the

data of address 51h and address 52h.

In the case of larger than the data of address 4Fh

and address 50h, AWB will be active again.

White balance data comes from the following

equation using averaged I and Q data of 16 areas

in one image.

I11

I12

I13

I14

I21

I22

I23

I24

I31

I32

I33

I34

I41

I42

I43

I44

Q11

Q12

Q13

Q14

Q21

Q22

Q23

Q24

Q31

Q32

Q33

Q34

Q41

Q42

Q43

Q44

White balance data =

{Weighted data 3 q x (64 – address 44h)

+ weighted data 4 w x address 44h} ÷ 64

15

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