MFC2000 datasheet(228/426 Pages) ETC

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MFC2000 Multifunctional Peripheral Controller 2000

Hardware Description

9-16

Conexant

100723A

The number of pixels to add or remove per 2187 pixels is next converted to a 7 digit base-3 number. Each digit in

the Base-3 number is weighted as:

MSD

LSD

Digit n

0123456

Weight

1/3

1/9

1/27

1/81

1/243

1/729

1/2187

Note:

MSD = most significant digit, LSD = lease significant digit.

Each digit can take on 3 possible values: 0, 1, or 2; corresponding to adding or removing (0, 1 or 2) * 3(6-n) pixels

for every 37 input pixels or, equivalently, adding or removing 0,1, or 2 pixels for every 3(n+1) pixels.

Note:

The actual number of pixels output from the resolution conversion block will always be a

multiple of 16 pixels.

Example: Reduction of 2048 pixel/line to 1728 pixel/line (B4 to A4 Reduction)

Given:

Input Resolution = 2048 pixel/line

Output Resolution = 1728 pixel/line

Notes:

Output Resolution must be a multiple of 16.

(Input Resolution - Output Resolution)/Input Resolution < = 1/3 for best results (i.e.,

consecutive pixels will not be removed))

In this case, (Input Resolution - Output Resolution)/Input Resolution = 320/2048 = 5/32. Therefore, ideally 5 pixels

will be removed for every 32 input pixels.

Compute the number of pixels to remove per 2187 input pixels:

Int{ [(Input-Output)/Input]*(2187) }

= Int{ [(2048-1728)/2048]*(3**7) }

= Int { [320/2048]*2187 }

= Int { 341.71875 }

= 341

Therefore, 341 pixels will be removed for every 2187 input pixels.

Represent the number of pixels to add per 2187 input pixels using powers of 3:

Using Figure 9-1 determine which combination of powers of 3 digits are required to represent 341. The table

should be filled from top to bottom. The sum of the enabled digits should equal 341 as illustrated below:

341 = 243 + 81 + 9 + 6 + 2

Therefore, digits 243, 81, 9, 6, and 2 should be enabled in the table.

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