Image Functions

Table 3.3 Mechanical offset error of the scanner

Output

X0 (dots) *1

Y0 (dots) *1

resolution

 

 

 

 

 

 

 

600 dpi

18 ± 18

24 ± 24

 

 

 

400 dpi

12 ± 12

16 ± 16

 

 

 

 

300 dpi

9 ±

9

12 ± 12

 

 

 

 

240 dpi

8 ±

8

10 ± 10

 

 

 

 

 

200 dpi

6 ±

6

8 ±

8

 

 

 

 

 

150 dpi

5 ±

5

6 ±

6

 

 

 

 

 

100 dpi

3 ±

3

4 ±

4

 

 

 

 

 

*1 When the document skewed, X0 and Y0 represents the minimum length of the offset along with the edge.

Origin point of ULX, ULY

Y0

X0

Actual origin point of the sheet

Size is the length of W and L in Figure 3.1 and 3.2 with 1/1200 in unit. The scanner rounds up the value to byte. The output pixels in main scanning direction and output lines in sub-scanning direction

are obtained as follows.

a)Output pixels in main scanning direction Scanning width : W (1/1200 in) = 10200 Output resolution: XR (dpi) = 400

[XR x W/1200]

Output pixel = ---------------------

= 425 (byte) *

8

* Values under 0 in [ ] are omitted

3-4