參數(shù)資料
型號(hào)： GL646USB
廠商： Electronic Theatre Controls, Inc.
英文描述： Three-in-one Scanner Controller for USB and 1394
中文描述： 三功能于一身的掃描儀控制器USB和1394
文件頁(yè)數(shù)： 16/43頁(yè)
文件大?。?/td> 280K
代理商： GL646USB
Revision 1.3
Mar.22 2001
-15-
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.
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
bandwidth
a,b,c,g : are black pixels
d,e,f,h,i : are white pixels
BWHI
BWLOW
a
b
c
d
e
f
g
h
i
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