GL646USB Ver la hoja de datos (PDF) - Unspecified

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GL646USB

Three-in-one Scanner Controller for USB and 1394

Unspecified 

GL646USB

Internal white shading by pixel (16 bits resolution) and dark shading by pixel (16 bits resolution) can be enabled or

disabled By S/W. The white shading curve is calculated by S/W.

Data arrangement: Normal mode: dark R1,white R1,dark G1,white G1,dark B1,white B1,

dark R2,white R2,dark G2,white G2,dark B2,white B2,

dark R3,white R3,dark G3,white G3,dark B3,white B3,……

Fast mode: dark R1,white data R1,dark R2,white R2,dark R3, white R3…

dark G1,white data G1,dark G2,white G2,dark G3,white G3…

dark B1,white data B1,dark B2,white B2,dark B3,white B3…

White shading formula : 2000H x Target / (Wn-Dn) = White Gain data ----- for 8 times system

White shading formula : 4000H x Target / (Wn-Dn) = White Gain data ----- for 4 times system

For example : Target = 3FFFH Wn = 2FFFH Dn = 0040H and 8 times system operation

then White Gain = 2000H x 3FFFH / (2FFFH-0040H) = 2AE4H (1.34033 times)

b. Correction :

GAMMA correction table by S/W calculation. The resolution is 12 or 14 bits gamma table.

Range: 0 to 64k (16 bits) input mapping to 0 to 4k (12 bits) output ;

0 to 64k (16 bits) input mapping to 0 to 16k (14 bits)output;

0 to 64k (16 bits) input mapping to 0 to 255 (8 bits) output ;

0 to 64k (16 bits) input mapping to 0 to 255 (8 bits) output;

6.12. Threshold Level Setting

Can be programmed by S/W.

Range: 0 to 255 can be adjusted by one increment.

The threshold with bandwidth in order to reduce image noise.

BWHI

BWLOW

d

h

f

b

e

i

c

g

a

a,b,c,g : are black pixels

d,e,f,h,i : are white pixels

6.13. Exposure Time Adjustable

Maximum: 512k pixels time (about 524 ms/line)

Adjustment step: 1 pixel time.

For Transparency scan, the exposure time can up to 524 ms.

6.14. To Control RGB Exposure Time Separately

Revision 1.3

-15-

bandwidth

Mar.22 2001

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